Entries |
Document | Title | Date |
20080218022 | Motor - A motor that reduces a cogging torque and rotates at a high speed is presented. The motor comprises: a shaft, a plurality of core blocks coupled to the shaft, a plurality of permanent magnets inserted into each of the core blocks, and an aligning unit, coaxial with the shaft, and disposed between the shaft and the core blocks. The core block includes a plurality of core sheets each having at least a pair of flux barriers formed to be symmetrical to each other about a line of symmetry. A first rib lies along the line of symmetry and a separate anti-deformation rib is positioned within each of the pair of flux barriers. Accordingly, a skew process for a rotor is facilitated. An anti-deformation rib within the flux barrier provides structural integrity for the core block. Accordingly, when the rotor is rotated with a high speed, a bridge is prevented from being deformed. | 09-11-2008 |
20080231135 | ELECTROMAGNETIC STEEL PLATE FORMING MEMBER, ELECTROMAGNETIC STEEL PLATE LAMINATOR, PERMANENT MAGNET TYPE SYNCHRONOUS ROTATING ELECTRIC MACHINE ROTOR PROVIDED WITH THE SAME, PERMANENT MAGNET TYPE SYNCHRONOUS ROTATING ELECTRIC MACHINE, AND VEHICLE, ELEVATOR, FLUID MACHINE, AND PROCESSING MACHINE USING THE ROTATING ELECTRIC MACHINE - An electromagnetic steel plate forming member provides the two magnet holes for inserting therein the two permanent magnets per pole along the V-shape, which are provided in the region of the radial pole pitch lines OP provided in the rotor core at the predetermined pole pitch angle θ, one magnet hole is displaced in a direction apart from the center line OC of the pole pitch lines OP, and the other magnet hole is displaced in a direction approaching to the center line OC of the pole pitch lines OP. | 09-25-2008 |
20080265706 | EMBEDDED MAGNET TYPE MOTOR - An embedded magnet type motor is disclosed. The rotor core of the motor has radially extending first accommodation holes and V-shaped accommodation holes. Each V-shaped accommodation hole includes a second accommodation hole and a third accommodation hole. A first gap is formed in each first accommodation hole. The first gap is not occupied by the corresponding first magnet. A second gap is formed in each second accommodation hole. The second gap is not occupied by the corresponding second magnet. A third gap is formed in each third accommodation hole at a radially outer portion. The third gap is not occupied by the corresponding third magnet. Each second gap and the adjacent third gap form one V-shaped gap. The angular width θa of each first gap and the angular width θb of each V-shaped gap are determined to satisfy the expression: 0.60<θa/θb<1.60. | 10-30-2008 |
20080284270 | Driving Apparatus - A rotating electric machine comprises a stator having stator salient poles, three-phases windings would around said stator salient poles, a rotor rotatable held inside the said stator, and permanent magnets inserted into said rotor and positioned opposite to said stator salient poles. The three-phase windings are concentratively wound around each of the stator salient poles, with windings of each phase wound around at more than one stator salient pole. The windings of each phase have a phase difference of voltage between at least one of the windings and the other. | 11-20-2008 |
20090066181 | ELECTRIC MACHINE - An electric machine, especially a brushless DC motor. Said electric machine comprises a rotor and a stator which is provided with current-carrying coils. Said rotor, in the circumferential direction, is provided with a plurality of permanent magnets that are embedded in respective magnet retainers between the peripheral surface and the shaft of the rotor in such a manner that the permanent magnets, in the radial direction, are completely encircled by the peripheral surface of the rotor. In the area of the magnet retainer, recesses extend laterally in the circumferential direction of the rotor and axially within the rotor. | 03-12-2009 |
20090079287 | Rotor - A rotor is provided with a rotor core, a magnet inserted into the rotor core and a filling portion arranged in a space between the rotor core and the magnet. The space between the rotor core and a radially outer side surface of the magnet has a uniform width in a central portion (portion (A)) with respect to a width direction (of arrow (DR | 03-26-2009 |
20090102306 | Field Element Core - A field element core has field magnet through holes and connecting portions. The field magnet through holes are circumferentially arranged in a circumferential direction around a given direction, and are adjacent each other in the circumferential direction to form pairs. Seen from the given direction, field magnet through holes forming the same pair both extend along a certain one direction determined for each pair. A connecting portion is provided between the field magnet through holes of the same pair, and has the ends as its sides. The sides of the connecting portion are curved in a concave shape as a whole. Specifically, seen from the given direction, a tangent to the side is along the direction of extension of the connecting portion only at a certain one position between both ends of the side. The same holds true for the side. | 04-23-2009 |
20090115279 | Rotor For An Electrical Machine | 05-07-2009 |
20090115280 | EMBEDDED MAGNET TYPE MOTOR - A rotor of an embedded magnet type motor is disclosed. A rotor core of the motor includes first accommodation holes and V-shaped accommodation holes The first accommodation holes extend in radial directions, and the V-shaped accommodation holes protrude radially outward. The rotor core has grooves at positions corresponding to the first accommodation holes on the outer periphery of the rotor core. Each groove has a width as a dimension in the circumferential direction when viewed from the axial direction. Each first magnet has a width as a dimension in the circumferential direction when viewed from the axial direction. The width of the grooves is larger than the width of the first magnets. | 05-07-2009 |
20090127961 | PERMANENT MAGNET ROTOR - The invention relates to a permanent magnet rotor for an electric motor, in which the permanent magnets inside the rotor extend parallel to the rotation axis of the rotor, and in the area of the radially outer longitudinal edges of the permanent magnets, grooves that are open to the outside are formed on the outer periphery of the rotor. These groves are each, in a peripheral direction, slanted or curved with regard to the longitudinal edge of the adjacent permanent magnets. The center line of each groove intersects the longitudinal edge of the adjacent permanent magnet at least once. The grooves on the outside of the rotor have, in the peripheral direction, a smaller width than in an area of the groove situated radially further inside, and the cross-sectional shape of the groove is constant over the length of the rotor. The invention also relates to a method for producing a rotor of the aforementioned type. | 05-21-2009 |
20090127962 | CORE, ROTOR, MOTOR AND COMPRESSOR - A rotor includes a core extending in a predetermined directions, and a plurality of magnets. The core has parts formed by magnetic materials and extending in the predetermined direction. The parts are arranged in a loop around the part, and face the part through gaps. The magnets are buried in the gaps in the form of a loop in the core. The magnets have pole faces extending in the predetermined direction. In each of the magnets, at least one of ends of the magnet protrudes forward in parallel to the predetermined direction with respect to an end of the part that is on the same side with the at least one of the ends of the magnet. | 05-21-2009 |
20090134732 | IPM TYPE OF SYNCHRONOUS MACHINE - A synchronous machine comprises a stator and a rotor that faces the stator and rotates on a shaft thereof in a circumferential direction The rotor has magnetic salient poles that generate reluctance torque and magnet-originating magnetic poles that generate magnet torque by using permanent magnets embedded in the rotor, The machine comprises means for shifting a magnetically substantial central position of magnetic flux emanating from the permanent magnets in the circumferential direction, by an electrical angle π/2 plus a predetermined angle Δθ, from a reference position taken as a central position between paired magnetic salient poles composing each magnetic pole of the machine among the magnetic salient poles. Hence a maximum amplitude of a sum between a harmonic component of the magnet torque and the reluctance torque is changed from that obtained at the reference position without the shift. | 05-28-2009 |
20090140592 | METHODS AND APPARATUS FOR A PERMANENT MAGNET MACHINE WITH AN ADDED AIR BARRIER - An internal permanent magnet machine (“IPM machine”) of the type used, for example, with traction motors and hybrid electric vehicles, includes a rotor with an additional air barrier provided above the first magnet barrier in the same rotor slot. Each magnet only fills a portion of each cavity, thereby defining the air barriers. The added air barrier above the permanent magnet of the first layer acts as a barrier to the first layer magnet and lowers the magnet flux. | 06-04-2009 |
20090140593 | METHODS AND APPARATUS FOR A PERMANENT MAGNET MACHINE WITH ADDED ROTOR SLOTS - An internal permanent magnet machine (“IPM machine”) of the type used, for example, with traction motors and hybrid electric vehicles, includes a rotor with additional, small rotor slots configured to provide and averaging effect with respect to rotor barriers provided therein. | 06-04-2009 |
20090146519 | LAMINATED ROTOR CORE AND METHOD FOR MANUFACTURING THE SAME - A stamping step of forming a plurality of band-shaped core sheets ( | 06-11-2009 |
20090146520 | PERMANENT MAGNET UNIT FOR AN ELECTRICAL MACHINE, A METHOD OF INSTALLING PERMANENT MAGNET UNITS AND A ROTOR OF AN ELECTRICAL MACHINE - In a permanent magnet unit according to the invention, designed for an electrical machine comprising a stator and rotor, at least one permanent magnet ( | 06-11-2009 |
20090146521 | PERMANENT MAGNET MODULE AND AN ELECTRICAL MACHINE ROTOR INCLUDING THE MODULE - The object of the invention is a permanent magnet module comprising at least two permanent magnets with the first magnetic pole on the first plane surface and the second magnetic pole on the second plane surface, and a cover at least partially enveloping the permanent magnets. According to the invention the cover of the module is magnetically conductive and comprises a top surface, substantially covering the first plane surface of the permanent magnet, and a bottom surface, substantially covering the second plane surface of the permanent magnet. The cover is at least partially open at the side surfaces of the permanent magnet. Another object of the invention is a rotor for an electrical machine, the rotor having permanent magnets fitted into a corresponding module. | 06-11-2009 |
20090160284 | ELECTRICAL ROTATION MACHINE AND A WIND TURBINE SYSTEM - An electric rotation machine for windmill power generation equipped with a stator slot structure having distributed windings and a rotor pole structure having permanent magnets, wherein the number of slots per pole per phase (Nspp) is undividable by 3 times P (where P is the number of poles), and pole width rate Pw obtained by dividing pole piece width Tp by pole pitch Tr at the outermost diameters of the adjoining poles of the rotor is satisfied any of Pw≦0.6, 0.67≦Pw≦0.71, and 0.78≦Pw. The distortion factors of induced voltages in a permanent magnet type electrical rotation machine, particularly for windmill power generation, can be reduced. | 06-25-2009 |
20090174273 | Production method of rotor and rotor - The present invention has an object to propose a method of producing a rotor, capable of reliably fixing a magnet to a rotor core with resin and preventing breakage of the rotor core. The present invention includes a step of fixing a permanent magnet to a rotor core by injecting molten resin into a slot by injection molding on the condition that, assuming that: a dimension between an end surface of the rotor core and an end surface of the permanent magnet is a core end surface-magnet interval; and a minimum value of a dimension between an inner surface of the slot and a side surface of the permanent magnet, allowing the molten resin to fully fill a clearance between the inner surface of the slot and the side surface of the permanent magnet by injecting the resin into the slot through a cylinder, is a minimum slot-magnet interval value, and a value of the core end surface-magnet interval is equal to or larger than the minimum slot-magnet interval value. | 07-09-2009 |
20090174274 | Permanent Magnet Electric Rotating Machine and Electromotive Vehicle Using Permanent Magnet Electric Rotating Machine - A magnetic gap is provided between a permanent magnet of a rotor and an auxiliary magnet pole portion which is arranged adjacent to the permanent magnet in a peripheral direction. A gradual change in a magnetic flux density distribution of a surface of the rotor is obtained and a cogging torque and a torque pulsation are restrained. By obtaining a reluctance torque according to the auxiliary magnetic pole, a permanent magnet electric rotating machine in which the cogging torque and the torque pulsation are restrained can be obtained and further an electromotive vehicle having the permanent magnet electric rotating machine can be provided. | 07-09-2009 |
20090212652 | Magnetic Member, Rotor, Motor, Compressor, Blower, Air Conditioner and Vehicle-Mounted Air Conditioner - A magnetic member with an annular outer periphery and an inner periphery includes first portions and second portions alternately disposed in its circumferential direction. The first portions and second portions are magnetically separated in the circumferential direction by gaps, which block magnetic fluxes from flowing in the circumferential direction between the first portion and second portion. The first portions respectively have holes extending almost in the circumferential direction. The gaps are provided at both ends of the holes in the circumferential direction between the outer periphery and inner periphery. An interior permanent magnet type rotor can be structured by inserting field magnets into the holes. | 08-27-2009 |
20090230802 | PERMANENT MAGNET TYPE GENERATOR AND HYBRID VEHICLE USING THE SAME - The present invention comprises a stator, and a rotor which is disposed oppositely to the stator with a gap interposed. The stator comprises a stator core, and a distributed stator winding mounted to the stator core. The stator core comprises a ring-like yoke core, and a plurality of teeth cores which protrude from the yoke core in the radial direction. The rotor comprises a rotor core, and a plurality of permanent magnets embedded in the rotor core. A pair of non-magnetic portions is created inside the rotor core and on both sides of the circumferential width of a permanent magnet for one magnetic pole. In the rotor core located on the stator side of the pair of non-magnetic portions, a pair of magnetic paths is created as the result of the creation of the pair of non-magnetic portions. Furthermore, a groove or hole is created on the outer circumferential portion of the rotor core and between the adjacent magnetic poles. | 09-17-2009 |
20090236924 | BRUSHLESS MACHINE WITH TAPERED POLES - A method and apparatus in which a rotor ( | 09-24-2009 |
20090261679 | ROTATING ELECTRICAL MACHINE - An object of the present invention is to provide an internal permanent magnet type rotating electrical machine capable of maintaining compactness and high output and reducing vibration and noise caused by electromagnetic force. The rotating electrical machine of the present invention has an annular stator and a rotor that is arranged inside the stator with an air gap interposed between the stator and the rotor. The stator has a stator iron core provided with a plurality of slots at circumferential intervals and a coil received in each of the slots. The rotor has a rotor iron core, a plurality of permanent magnets embedded in a plurality of magnetic pole forming positions that are set along an outer circumference of the rotor iron core, an iron core section that faces the air gap and is magnetized by the permanent magnets to form a magnetic pole on an air gap fronting face at each of the magnetic pole forming positions, and an axially extending recess formed at a circumferentially central part of the air gap fronting face of each of the iron core sections. | 10-22-2009 |
20090278417 | IPM Rotor, IPM Rotor Manufacturing Method and IPM Rotor Manufacturing Apparatus - An injection apparatus includes a gate for injecting a filler to a gap between an inner wall of a slot and a permanent magnet. A plurality of gates are provided for one slot. An IPM rotor with improved NV characteristics, and method and apparatus for manufacturing such an IPM rotor can be provided by such a structure. | 11-12-2009 |
20090289517 | PM ROTOR HAVING RADIAL COOLING SLOTS AND CORRESPONDING PRODUCTION METHOD - The invention relates to a PM rotor having radial cooling slots and to a corresponding method of production. The aim of the invention is to provide a structurally simple rotor which has a high degree of efficiency. According to the invention, the rotor consists a plurality of partial laminated stacks ( | 11-26-2009 |
20090295248 | ELECTRIC MOTOR - An electric motor includes a stator with a stator core and a rotor. The rotor includes n magnets polarized along the radial direction of the rotor. The magnets have the same polarization and each forms two magnetic circuits passing through corresponding portions of the stator core, whereby the rotor forms 2n magnetic poles. | 12-03-2009 |
20100001606 | PERMANENT MAGNET TYPE ROTOR - A rotor is provided. The rotor includes a rotor iron core including slots formed around an outer circumferential portion thereof; magnet pieces which are inserted into the slots, respectively, such that a magnetic orientation of the magnet pieces are inverted every predetermined number of the slots; and two end plates, one end plate disposed on each end side in an axial direction of the rotor iron core, the two end plates covering the slots in the axial direction. The rotor iron core also includes cutout portions, which are located at an interval between adjacent ones of the slots, each of the cutout portions extending in the axial direction of the rotor iron core. One of the two end plates includes injection openings, each of which corresponds to a respective one of the slots, and communicating grooves each of which is formed so as to communicate with one of the cutout portions. | 01-07-2010 |
20100001607 | PERMANENT MAGNET ROTATING MACHINE - Permanent magnets | 01-07-2010 |
20100026127 | ROTOR AND METHOD OF MANUFACTURING THE ROTOR AND ELECTRIC VEHICLE - A rotor includes: a rotor core formed by stacking a first sheet member and a second sheet member and having a first magnet-inserted hole and a second magnet-inserted hole located radially outward relative to the first magnet-inserted hole; magnets inserted respectively into the first and second magnet-inserted holes; and a resin portion injected into the first and second magnet-inserted holes. The first sheet member has a first hole and a second hole constituting the first and second magnet-inserted holes respectively. The second sheet member is located at at least one axial end of the rotor core and has a portion covering a part of the first hole. | 02-04-2010 |
20100026128 | INTERIOR PERMANENT MAGNET MOTOR INCLUDING ROTOR WITH UNEQUAL POLES - An electric machine includes a stator and a rotor core including a first rotor portion positioned adjacent the stator and having an outside diameter. The first rotor portion includes a plurality of elongated slots that define a plurality of poles. The electric machine also includes a plurality of magnets. Each of the plurality of magnets is positioned within one of the slots and arranged such that each of the plurality of poles has a magnetic arc length that is different than a magnetic arc length of any adjacent pole. | 02-04-2010 |
20100079026 | Electric machine - An electric machine includes a rotor having at least one pole pair, the at least one pole pair including a first magnetic pole and a second magnetic pole having opposite polarities. The first magnetic pole may include a first inner radial permanent-magnet layer and a first outer radial permanent-magnet layer. The second magnetic pole may include a second inner radial permanent-magnet layer and a second outer radial permanent-magnet layer. An outer end of the first inner radial permanent-magnet layer and an outer end of the second inner radial permanent-magnet layer may be separated by an angle of between about 27 and about 55 electrical degrees. The electric machine may also include a stator having a stator core with an odd number of stator slots per pole pair of the rotor. | 04-01-2010 |
20100117477 | PERMANENT MAGNET SYNCHRONOUS MOTOR AND HERMETIC COMPRESSOR - It is an objective to provide a permanent magnet synchronous motor that is highly efficient with low vibration and low noise. A stator | 05-13-2010 |
20100141076 | METHODS AND APPARATUS FOR A PERMANENT MAGNET MACHINE WITH SEGMENTED FERRITE MAGNETS - An internal permanent magnet machine (“IPM machine”) of the type used, for example, with traction motors and hybrid electric vehicles, includes a rotor having a plurality of equal-sized (e.g., rectilinear) segmented ferrite magnets arranged in one or more layers. The magnets are inserted within rotor slots that are larger than the magnets themselves, such that one or more air gaps are formed adjacent to the magnets in each layer. | 06-10-2010 |
20100148612 | BRUSHLESS MOTOR - A brushless motor including a stator having teeth and a rotor having magnetic pole portions is disclosed. The magnetic pole portions are arranged to have the same polarities as each other. The rotor includes gaps that function as magnetic resistance at circumferential ends of each of the magnetic pole portions so that an iron core portion is formed between the circumferentially adjacent magnetic pole portions. Magnetic flux of the magnetic pole portions passes through the iron core portion along the radial direction. The gaps include a first gap located on the leading end of the magnetic pole portion in the rotation direction of the rotor and a second gap located on the trailing end of the magnetic pole portion in the rotation direction of the rotor. The circumferential width of the first gap is set to be greater than the circumferential width of the second gap. | 06-17-2010 |
20100176682 | PERMANENT MAGNET TYPE ROTARY ELECTRIC MACHINE - A permanent magnet type rotary electric machine has a rotor having a rotor core and permanent magnets buried into the rotor core by being incorporated into respective permanent magnet slots. The permanent magnet slot per one pole is divided at least into four slots along an outer circumferential direction in the rotor core, and in respective rest core-portions between adjacent divided permanent magnet slots in the rotor core, a width of a first rest core-portion at the middle of each pole and a width of a second rest core-portion between adjacent poles of different polarities are formed larger than that of the others. | 07-15-2010 |
20100194228 | MOTOR AND COMPRESSOR TECHNOLOGY - An interior permanent magnet type brushless direct current (BLDG) motor includes a stator having a plurality of slots and a stator coil wound on the slots. The interior permanent magnet type brushless direct current (BLDC) motor also includes a rotor that rotates with respect to the stator and that has a rotor core and a plurality of permanent magnets positioned in the rotor core. The rotor has a notch that is cut off between adjacent permanent magnets. | 08-05-2010 |
20100213780 | Permanent magnet motor - A permanent magnet motor includes stator, rotor, and shaft; multiple rotor magnetic poles are disposed on the rotor; each rotor magnetic pole contains an arc surface and a first inclined section and a second inclined section extending respectively from both sides of the arc surface; a trap is formed between two second inclined section of two abutted rotor magnetic poles connected by a tangent section; multiple magnets are respectively disposed in each rotor magnetic pole; both ends of each magnet being disposed at where close to two second inclined sections; and a central portion of each magnet is indented inwardly towards a center of the rotor to effectively upgrade performance efficiency of the motor. | 08-26-2010 |
20100237735 | METHODS AND APPARATUS FOR PREVENTING DEMAGNETIZATION IN INTERIOR PERMANENT MAGNET MACHINES - An internal permanent magnet machine (“IPM machine”) of the type used, for example, with traction motors and hybrid electric vehicles, includes a rotor having a plurality of ferrite magnets arranged in one or more layers, wherein at least one of the layers includes rare earth magnets (e.g., NdFeB magnets) adjacent to the ferrite magnets to prevent or reduce demagnetization. | 09-23-2010 |
20100244609 | Permanent Magnet Type Electric Rotary Machine And Compressor Using The Same - A permanent magnet type electric rotary machine includes a stator including a stator core having teeth and slots, and a rotor provided with permanent magnets as magnet poles in a rotor core. A pole core portion which between each of the permanent magnets and an outer surface of the rotor core is provided with a plurality of pole slits. A region of the pole core portion is defined by concave portions provided on q-axes to be interpolars on both sides of the pole core portion, and thereby configured that a gap between the outer surface on the q-axis of the rotor core and an inner surface of the stator core is larger than a gap between the outer surface on the d-axis of the pole core portion and the inner surface of the stator, so that magnetic fluxes from the permanent magnet pass through the pole core portion concentrately. | 09-30-2010 |
20100253171 | ELECTRIC MACHINE - An interior permanent magnet electric machine is disclosed. The interior permanent magnet electric machine comprises a rotor comprising a plurality of radially placed magnets each having a proximal end and a distal end, wherein each magnet comprises a plurality of magnetic segments and at least one magnetic segment towards the distal end comprises a high resistivity magnetic material. | 10-07-2010 |
20100259123 | FIELD ELEMENT CORE - A field element core includes field magnet through holes and coupling part. The field magnet through holes are circularly disposed in a peripheral direction around a predetermined direction and are adjacent to each other in the peripheral direction to form a set. The field magnet through holes forming the same pair both extend along a given direction that is defined for each pair, when viewed from the predetermined direction. The coupling part | 10-14-2010 |
20100289370 | SYNCHRONOUS MOTOR HAVING 12 STATOR TEETH AND 10 ROTOR POLES - The invention relates to an electric machine ( | 11-18-2010 |
20100301697 | ROTOR FOR ROTATING ELECTRICAL MACHINE - A rotor for a rotating electrical machine suppresses demagnetization of permanent magnets without deteriorating motor characteristics, is low-cost, and is highly reliable. The rotor has a plurality of rotor cores ( | 12-02-2010 |
20110001382 | Permanent Magnet Machine with Offset Pole Spacing - An internal permanent magnet machine has multiple rotor sections, each section having multiple rotor laminations. Permanent magnets are placed asymmetrically in lamination openings to attenuate oscillations in torque caused by harmonic components of magnetic flux. | 01-06-2011 |
20110006632 | EMBEDDED MAGNET MOTOR AND MANUFACTURING METHOD OF THE SAME - In an embedded magnet motor, radial magnets and first inclined magnets form north poles. The radial magnets and second inclined magnets form south poles. Core sheets each include preformed radial accommodating slots the number of which is expressed by P/2. Some of the preformed radial accommodating slots are short slots and the rest are long slots. The short slots are located at some parts of each radial accommodating slot along the axial direction. Radially inner ends of the short slots restrict the radial magnets from moving radially inward. | 01-13-2011 |
20110012464 | ROTOR FOR AN INTERIOR PERMANENT MAGNET SYNCHRONOUS MOTOR - The present invention provides a rotor for an interior permanent magnet synchronous motor for driving an air blower, in which the structure of the rotor is suitably modified to reduce magnetic flux leakage and, at the same time, maximize saliency ratio, thus improving the performance of the motor. | 01-20-2011 |
20110012465 | INTERIOR PERMANENT MAGNET ROTOR, ELECTRIC MOTOR USING THE SAME AND ELECTRIC DEVICE | 01-20-2011 |
20110062814 | PERMANENT MAGNET EMBEDDED ROTATING ELECTRICAL MACHINE - The permanent magnet embedded rotating electrical machine includes a rotor and a plurality of flat permanent magnets. The rotor has on an outer periphery thereof a plurality of pairs of concave portions and a plurality of convex portions. Each of the convex portions is located between the pair of concave portions. The concave portions are formed at radially outward of respective adjacent magnetic pole ends of the permanent magnet. A bridge is provided in the rotor at an angular position about an axis of the rotor between opposed magnetic pole ends of two adjacent permanent magnets. Each concave portion at radially outward of the magnetic pole end of the permanent magnet is located close to the center of the same permanent magnet in relation to the bridge next to the permanent magnet in the circumferential direction of the rotor. | 03-17-2011 |
20110062815 | FIELD ELEMENT - A field element core has a perimeter exposed around a rotation axis and a plurality of field magnet insertion holes circularly disposed around the rotation axis P. A radius between the perimeter and the rotation axis P decreases in a monotonically non-increasing manner from a pole center toward an interpole and then increases in a monotonically non-decreasing manner in a region between the pole center and the interpole in a circumferential direction. | 03-17-2011 |
20110068652 | TRACTION MOTOR FOR ELECTRIC VEHICLES - A traction motor for an electric vehicle, comprises a stator and a rotor rotatably mounted to the stator. The rotor comprises a rotor core and magnets fixed to the rotor core. The rotor core has 2P rotor poles formed by the magnets, P being an integer greater than one. The stator comprises a stator core having S teeth and field windings wound on the teeth, S being equal to 3·m·P where m is the number of phases. Field windings of each phase comprises P winding units. Each the winding unit comprises a first coil and a second coil connected in series. The first coils have a larger coil pitch and a greater number of turns compared to the second coils. | 03-24-2011 |
20110115328 | EMBEDDED MAGNET MOTOR AND MANUFACTURING METHOD OF THE SAME - In an embedded magnet motor, radial magnets and first inclined magnets form north poles. The radial magnets and second inclined magnets form south poles. Core sheets each include preformed radial accommodating slots the number of which is expressed by P/2. Some of the preformed radial accommodating slots are short slots and the rest are long slots. The short slots are located at some parts of each radial accommodating slot along the axial direction. Radially inner ends of the short slots restrict the radial magnets from moving radially inward. | 05-19-2011 |
20110121677 | ROTOR FOR A PERMANENT MAGNET ELECTRIC MACHINE - A rotor for a permanent magnet electric motor includes a rotor core having a generally cylindrical shape with an outer circumferential surface and a rotational axis and a plurality of magnet insertion hole arrangements formed in the rotor core and arranged circumferentially at a preset angular interval about the rotational axis. Each hole arrangement has a radially inward side, a radially outward side, and two ends that are respectively spaced apart from the circumferential surface by respective bridge regions formed by the rotor core. The material of the bridge regions is metallurgically transformed by having its grain structure changed, e.g., by heating the material to at least its Curie temperature, whereby the material possesses greater magnetic reluctance than the material of adjacent portions of the rotor core. | 05-26-2011 |
20110133590 | ROTOR STRUCTURE FOR INTERIOR PERMANENT MAGNET ELECTROMOTIVE MACHINE - A rotor structure for an interior permanent magnet (IPM) electromotive machine is provided. The rotor structure may include at least one rotor lamination, which in turn may include at least one slot arranged to receive at least one permanent magnet. The slot divides the rotor lamination into a pole region and a yoke region. At least one bridge is arranged to connect the pole region to the yoke region at an outer edge of the lamination. The outer edge of the lamination is profiled along a segment of the bridge to define a concave curved profile for the bridge. The concave curved profile for the bridge allows to selectively size a thickness of the bridge to affect at least some electromagnetic and/or mechanical characteristic of the machine. | 06-09-2011 |
20110163624 | PERMANENT MAGNET TYPE ROTARY ELECTRIC MACHINE - A rotary electric machine, wherein the rotation direction of a rotor is a defined direction, a groove is provided in a rotor core on the radial outside with respect to permanent magnets, and the groove is provided in a position inclined from the centerline between the permanent magnets within a magnetic pole head and at the same time in a position excluding an end portion of a permanent magnet insertion hole on the radial outside, in order to enable a reduction in a no-load induced electromotive force and prevention of a decrease in output. | 07-07-2011 |
20110204741 | BRUSHLESS MACHINE HAVING FERROMAGNETIC SIDE PLATES AND SIDE MAGNETS - An apparatus is provided having a cylindrical stator and a rotor that is spaced from a stator to define an annular primary air gap air gap that receives AC flux from the stator. The rotor has a plurality of longitudinal pole portions disposed parallel to the axis of rotation and alternating in polarity around a circumference of the rotor. each longitudinal pole portion includes portions of permanent magnet (PM) material and at least one of the longitudinal pole portions has a first end and an opposing second end and a side magnet is disposed adjacent the first end and a side pole is disposed adjacent the second end. | 08-25-2011 |
20110266910 | ROTOR, ROTATING ELECTRIC MACHINE, VEHICLE, ELEVATOR, FLUID MACHINE, AND PROCESSING MACHINE - A rotor includes a rotor core, a first magnet, a second magnet, a first pole partition line, and a second pole partition line. The first and second magnets are provided inside the rotor core and between the first and second pole partition line. The first magnet is closer to the first pole partition line than to the second pole partition line, and the second magnet is closer to the second pole partition line than to the first pole partition line. A distance between the first and second magnets at a position is wider as the position is closer to a circumference portion of the rotor core. The first magnet and the first pole partition line have a first minimum distance therebetween, the second magnet and the second pole partition line have a second minimum distance therebetween, and the first minimum distance is smaller than the second minimum distance. | 11-03-2011 |
20110273049 | ROTOR LAMINATION ASSEMBLY - An electric machine includes a stator, and a rotor lamination assembly configured and disposed to rotate relative to the stator. The rotor lamination assembly includes at least one lamination member including a body member having an outer diametric edge, and at least one magnet receiving member. The at least one magnet receiving member includes a first end that extends to a second end. The second end establishes an interruption zone in the outer diametric edge. | 11-10-2011 |
20110278977 | ROTOR FOR ELECTRIC ROTATING MACHINE - A rotor includes a hollow cylindrical rotor core and permanent magnets embedded in the rotor core to form a plurality of magnetic poles on the radially outer periphery of the rotor core. The rotor core has a plurality of openings each of which extends in the axial direction of the rotor core so as to penetrate it. When viewed along the axial direction, each of the openings is symmetrically positioned with respect to the centerline of a corresponding one of the magnetic poles. For each of the openings, there are provided n reinforcing portions, where n is an integer not less than 2. The n reinforcing portions extend to connect a pair of radially-inner and radially-outer peripheral portions of the rotor core, thereby partitioning the opening into (n+1) parts. The n reinforcing portions are symmetrically arranged with respect to the centerline of the corresponding magnetic pole. | 11-17-2011 |
20110285239 | Permanent Magnet Machine with Offset Pole Spacing - An internal permanent magnet machine has multiple rotor sections, each section having multiple rotor laminations. Permanent magnets are placed asymmetrically in lamination openings to attenuate oscillations in torque caused by harmonic components of magnetic flux. | 11-24-2011 |
20110291515 | Brushless motor - A brushless motor has a stator and a rotor. The stator has a stator core with a plurality of inwardly extending salient poles and windings wound about the salient poles. The rotor has a shaft, a rotor core fixed onto the shaft, and magnets inserted in the rotor core for forming magnetic poles of the rotor. Each of the salient poles has a pole shoe with a pole face that extends along a circumferential direction confronting the rotor core and being spaced from the rotor core by an air gap. In a radial cross section of the motor, each of the magnetic poles of the rotor has an effective dimension (W) which is about 0.85 times to 1.2 times of the chord length (L) of each pole face. | 12-01-2011 |
20110309706 | PERMANENT MAGNET ELECTRIC MOTOR - According to one embodiment, a rotor | 12-22-2011 |
20110316378 | SYNCHRONOUS ROTATING ELECTRICAL MACHINE WITH PERMANENT MAGNETS AND FLUX CONCENTRATION - A synchronous rotating electrical machine is disclosed, of the type including a stator ( | 12-29-2011 |
20120098378 | MOTOR - A motor includes a rotor of 4n magnetic poles and a stator. The rotor includes a rotor core, 2n magnets embedded in the rotor core and 2n salient pole portions formed integrally with the rotor core. A gap is formed between each magnet and the circumferentially adjacent salient pole portion. The stator has 6n tooth portions arranged to face the magnets and the salient pole portions in the radial direction, and coils. Each coil is wound about one of the tooth portions. An electric angle α that corresponds to a mechanical angle α′ defined by a reference line that passes through a central axis of the rotor and the circumferential center position of each magnet, and a line that passes through the central axis of the rotor and the trailing end of each trailing gap, is set in the range of 90°<α<126°. | 04-26-2012 |
20120104891 | ROTOR OF ROTARY ELECTRIC MACHINE - A rotor of a rotary electric machine includes a rotor core and a plurality of magnetic parts. The rotor core has a plurality of slots provided along a circumferential direction. Each of the slots is separated by a center rib. The plurality of magnetic parts are disposed inside the rotor core along the circumferential direction at a predetermined interval. Each of the magnetic parts has a magnetization direction alternating with each other. Each of the magnetic parts includes a pair of permanent magnets placed inside each of the slots. The rotor core comprises a plurality of through-holes and a reinforcement rib. The plurality of through-holes each extend in an axial direction on an inner circumferential side of each of the magnetic parts. The reinforcement rib is disposed in each of the through-holes and in alignment with a circumferential center line of the center rib. | 05-03-2012 |
20120104892 | ROTARY ELECTRIC MACHINE - A rotary electric machine includes a rotor core, and a permanent magnet embedded in proximity to an outer circumferential portion of the rotor core, in which gaps for reducing irreversible demagnetization of the permanent magnet are provided on portions on an inner circumference side of the permanent magnet, the portions being of the rotor core in proximity to an inner circumferential surface of the permanent magnet. | 05-03-2012 |
20120112592 | ROTOR AND MOTOR - A rotor comprises a rotor core, a plurality of magnetic poles arranged in a circumferential direction of the rotor core, a plurality of salient poles and a plurality of auxiliary magnets each of which is disposed between the magnetic pole and the salient pole is provided. Each magnet pole has a field magnet pole that serves as a first magnetic pole, wherein the field magnet is a main magnet. Each salient pole is integrally formed with the rotor core between the two adjacent magnetic poles. Each salient pole serves as a second magnetic pole. The pole of the second magnetic pole is opposite from that of the first magnetic pole. The auxiliary magnet generates magnetic flux in a circumferential direction of the rotor core so that the magnetic pole and an opposing pole of the auxiliary magnet have the same polarity and the salient pole and another opposing pole of the auxiliary magnet have the same polarity. | 05-10-2012 |
20120139381 | PERMANENT MAGNET ROTORS AND METHODS OF ASSEMBLING THE SAME - A method for securing a permanent magnet within a rotor core is described. The rotor core includes a first end and a second end and at least one permanent magnet opening configured to receive the permanent magnet. The method includes coupling a first rotor end lamination to the first end of the rotor core. The first lamination includes at least one inner wall that defines an opening within the first lamination that corresponds to the permanent magnet opening in the rotor core. The first lamination includes a bridge portion positioned between the at least one inner wall and an outer edge of the first rotor end lamination. The method also includes positioning a permanent magnet at least partially within the permanent magnet opening and mechanically deforming the bridge portion of the first lamination to secure the permanent magnet within the permanent magnet opening. | 06-07-2012 |
20120153764 | SYNCHRONOUS MOTOR WITH PERMANENT MAGNETS - The present invention relates to synchronous motor comprising a cylindrical rotor ( | 06-21-2012 |
20120153765 | IPM MOTOR ROTOR AND PRODUCTION METHOD THEREFOR - In an IPM motor rotor, a rotor core has a plurality of magnetic poles, and each magnetic pole is formed by two permanent magnets. The two permanent magnets of each magnetic pole are two split pieces obtained by splitting one parent permanent magnet that is larger than the permanent magnets. | 06-21-2012 |
20120175989 | PERMANENT MAGNET EXCITED SYNCHRONOUS MACHINE WITH EMBEDDED MAGNETS - A permanent magnet excited synchronous machine ( | 07-12-2012 |
20120194026 | PERMANENT MAGNET TYPE ROTATING ELECTRICAL MACHINE - A permanent magnet type rotating electrical machine includes a rotor having a rotor core. Magnet holes circumferentially arranged at regular intervals in the rotor core include pairs of first magnet holes and pairs of second magnet holes. Each pair of first magnet holes are symmetric with respect to an imaginary line extending through a rotor core center. Each pair of second magnet holes are located on a radially inner side of the rotor core and are symmetric with respect to the imaginary line. Each pair of second magnet holes are located on an inner circumferential side of the paired first magnet holes with respect to a radial direction of the rotor core. A first magnet angle made by permanent magnets located in each pair of first magnet holes is larger than a second magnet angle made by permanent magnets located in each pair of second magnet holes. | 08-02-2012 |
20120242182 | ROTOR OF PERMANENT MAGNET EMBEDDED MOTOR, BLOWER, AND COMPRESSOR - A rotor of a permanent magnet embedded motor includes a rotor iron core formed by stacking a predetermined number of magnetic steel sheets punched into predetermined shapes, a plurality of permanent-magnet insertion holes formed along an outer circumferential portion of the rotor iron core and each including permanent-magnet end-portion cavities on its both ends, a plurality of permanent magnets inserted into the permanent-magnet insertion holes, and a plurality of slits formed in the outer-peripheral side iron core portion outside of each permanent-magnet insertion holes, wherein a distance between a first slit present in a radial direction of each of the end portions of the permanent magnets and a second slit, which is adjacent to the first slit and closer to the center of its magnetic pole, is smaller than a distance between those slits other than the first and second slits. | 09-27-2012 |
20120248919 | MOTOR AND ELECTRIC PUMP - A motor in which drive current supplied to a winding is controlled in accordance with a rotational position of a rotor detected from a waveform of an induced voltage between phases. The motor is provided with a stator including 3×n teeth and windings for three phases. A rotor includes a rotor core, an n number of magnets, and an n number of salient poles. The magnets function as one of the magnetic poles, the salient poles function as the other one of the magnetic poles. Each salient pole is spaced apart by a gap from the adjacent ones of the magnets in the circumferential direction. The magnets and gap are arranged inward in the radial direction from the rotor core. An electrical angle between two ends of each magnet is set to be smaller than an electrical angle between two ends of each salient pole. | 10-04-2012 |
20120256509 | MOTOR AND MAGNETIZING APPARATUS AND MAGNETIZING METHOD OF MOTOR - An apparatus for magnetizing magnets provided among a plurality of cores of a motor of a washing machine and a method thereof, is capable of fully magnetizing a magnet forming a rotor and including a plurality of teeth disposed around two cores of the plurality of cores, the two cores being laterally provided while interposing one of the magnets therebetween, and a coil being provided around the plurality of teeth to form a magnetic flux to magnetize the one magnet interposed between the two cores laterally provided. | 10-11-2012 |
20120267977 | Electrical Drive Motor for a Vehicle - An electric drive motor that is intended for a vehicle, in particular for a motor vehicle, includes a stator and a rotor with at least one pole pair, wherein each pole of a respective pole pair has a magnet arrangement having at least one buried magnetic layer. The drive motor is characterized in that each pole has a number of magnetic flux influencing groups, each of which has a number of air-filled recesses, which are not assigned to a magnet of a respective magnetic layer for purposes of flux conductance. | 10-25-2012 |
20120274168 | HYBRID SYNCHRONOUS MOTORS AND CURRENT-ENERGIZED SYNCHRONOUS MOTORS SUITABLE FOR VEHICLE DRIVES - Laminated rotor ( | 11-01-2012 |
20120274169 | Rotating Electric Machine and Automobile - A rotating electric machine includes a stator and a rotor. Each of magnetic poles of the rotor includes a magnet insertion hole, a permanent magnet that is inserted in the magnet insertion hole, and a nonmagnetic portion formed between the permanent magnet and an auxiliary salient pole. A portion of the rotor core located toward the stator relative to the nonmagnetic portion function as a bridge portion connecting a magnetic pole peace with the auxiliary salient pole. A side of the nonmagnetic portion located toward the stator includes a first side at the bridge portion, extending along a virtual circular arc passing through the permanent magnet insertion hole closest to the stator, and a side of the nonmagnetic portion located toward the auxiliary salient pole includes a second side extending away from the stator, with the first side and the second side connected through a curved line. | 11-01-2012 |
20130002082 | ROTOR AND METHOD FOR MANUFACTURING THE ROTOR - A rotor has a rotor core arranged to radially face a stator. The rotor core has an accommodation hole extending axially from an axial end face of the rotor core. A magnet is received in the accommodation hole. A recess, which is dented in a direction separating from the magnet, is formed in an end surface of the accommodation hole. The recess has an opening facing the magnet. A pair of open distal portions are arranged at opposite sides of the opening and pressed against the magnet. | 01-03-2013 |
20130043757 | INTERIOR PERMANENT MAGNET MOTOR - An interior permanent magnet motor includes a rotor and a stator. The rotor includes a rotor core. The rotor core is formed by laminating steel plates each including pairs of magnet insertion holes and pairs of cutouts. Each pair of magnet insertion holes includes two magnet insertion holes that are arranged in a V-shape, the wide end of which is relatively closer to the outer edge with a support portion located in between. Each pair of cutouts is formed at q-axis ends of the corresponding magnet insertion holes, and includes two cutouts connected to the outer edge of the rotor core. In a state where the permanent magnets are inserted in the magnet insertion holes, a gap is formed at a d-axis end of each magnet insertion hole. | 02-21-2013 |
20130057104 | PERMANENT MAGNET MOTORS AND METHODS OF ASSEMBLING THE SAME - A rotatable assembly that includes a plurality of permanent magnets and a rotor core is described. The rotor core includes a first end, a second end, and at least one inner wall that defines a permanent magnet opening configured to receive at least one permanent magnet of the plurality of permanent magnets. The rotor core further includes at least one bridge positioned between permanent magnet openings, wherein at least a first permanent magnet and a second permanent magnet of the plurality of permanent magnets generates a first rotor pole of a plurality of rotor poles. | 03-07-2013 |
20130057105 | PERMANENT MAGNET MOTORS AND METHODS OF ASSEMBLING THE SAME - A method for manufacturing an interior permanent magnet motor is described herein. The method includes providing a plurality of permanent magnets and fabricating a ferromagnetic rotor core configured to accept the permanent magnets therein such that the ferromagnetic material utilized to retain the permanent magnets within the rotor core operates to concentrate and steer the flux from one or more of the permanent magnets to a stator tooth. The method also includes positioning the rotor core with the permanent magnets therein with respect to a wound, open slot stator core. | 03-07-2013 |
20130069470 | INTERIOR PERMANENT MAGNET MACHINE WITH RADIALLY ASYMMETRIC MAGNET CONFIGURATION - An interior permanent magnet machine is provided with a rotor that includes a plurality of slots and at least one barrier defined by the plurality of slots. A plurality of first and second magnets are disposed within the barrier. The rotor is configured such that at least one of the first magnets is located at a different radial distance from the center of the rotor relative to at least one of the second magnets. The rotor may be configured to produce an averaging effect similar to that achieved through traditional skewing of rotor magnets. The rotor includes a plurality of poles defined by respective pole axes in the rotor and may be configured to reflect radial asymmetry between poles (pole-to-pole) and/or radial asymmetry within a pole. | 03-21-2013 |
20130093279 | ROTOR OF ROTARY ELECTRIC MACHINE - Provided is a rotor of a rotary electric machine comprising: a shaft which is a rotary shaft; a laminated core which has a permanent magnet embedded therein and is press-fitted to the shaft; a first member which is a magnetic member and is press-fitted to the shaft so as to hold an end portion of the laminated core; a second member which is a nonmagnetic member and is provided between the end portion of the laminated core and the first member so as to hold an end portion, with respect to the axial direction of the shaft, of the permanent magnet; and at least one of a first gap between the first member and the second member, and a second gap between the laminated core and the second member. | 04-18-2013 |
20130106226 | ELECTRIC ROTATING MACHINE | 05-02-2013 |
20130106227 | ELECTRIC ROTATING MACHINE | 05-02-2013 |
20130106228 | ELECTRIC ROTATING MACHINE | 05-02-2013 |
20130113326 | ROTOR CORE, ROTOR, AND ROTATING ELECTRIC MACHINE - A rotor core according to an embodiment has a plurality of magnet openings and cavity portions. The magnet openings are in juxtaposition with each other in a circumferential direction. Permanent magnets are inserted in the magnet openings. The cavity portions are each formed relative to an area sandwiched between two magnet openings, out of the magnet openings, in which the permanent magnets that are mutually adjacent and that have magnetic pole directions relative to a radial direction opposite to each other are inserted. | 05-09-2013 |
20130113327 | ROTOR CORE, ROTOR, AND ROTATING ELECTRIC MACHINE - A rotor core according to an embodiment includes a pair of magnet openings disposed such that a space therebetween widens toward an outer peripheral side and in which a pair of permanent magnets having a magnetic pole direction relative to a radial direction identical to each other are inserted. The magnet openings each have a shape that connects together a first opening portion formed along the profile of the corresponding permanent magnet and a second opening portion that, when the permanent magnet is inserted in the first opening portion, covers, out of corner portions of the permanent magnet, a corner portion closest to the other permanent magnet with an air gap defined therebetween. The second opening portion forms a bridge portion between the second opening portion and the second opening portion of the other magnet opening. | 05-09-2013 |
20130113328 | ROTOR AND IPM MOTOR - Disclosed are a rotor and an IPM motor capable of avoiding concentration of flux on a corner area of a magnet on the stator side, leading to reduction in demagnetizing field and accordingly reduction in a required coercive force, and reduction in the usage amount of dysprosium or the like and accordingly reduction in manufacturing cost. In a slot bored in a rotor core of a rotor making up a motor, at at least one of a slot face on a center side of the rotor core and a slot face facing this slot face is formed a protrusion or a concave groove, and the magnet to be inserted in the slot includes at least one of a concave groove and a protrusion to be engaged with the protrusion or the concave groove of the slot face at a position corresponding to the protrusion or the concave groove formed in the slot. Then, these concave groove and protrusion are engaged to form an engagement part. This engagement part aligns and fixes the magnet in the rotor, and a flux barrier is formed between a lateral side face of the magnet and a slot face, the flux harrier having a same thickness as a thickness of the magnet. | 05-09-2013 |
20130119810 | ELECTRIC ROTATING MACHINE - The present invention provides an electric rotating machine capable of providing a high quality and efficient machine operation with reduced oscillation and noise by lowering torque ripple. The electric rotating machine includes a stator having a plurality of teeth facing a rotor, and a plurality of slots providing spaces for winding coils around the teeth. The rotor has a pair of permanent magnets embedded therein and located in a “V” shape configuration. Six slots of each set of the plurality of slots face one magnetic pole formed by the permanent magnets of each pair and the adjacent flux barriers. The plurality of teeth includes long teeth and short teeth. The distance xL between each of the long teeth and the rotor and the distance xS between each of the short teeth and the rotor meet the condition 0.1≦(xS−xL)/xL≦0.3. | 05-16-2013 |
20130119811 | ROTOR AND PERMANENT MAGNETIC ROTATING MACHINE - Provided are a rotor adapted for a permanent magnetic rotating machine, the machine includes a rotor and a stator comprising a stator core having two or more slots, and winding wires wound through the stator core. The rotor includes a rotor core having two or more insertion holes formed in the rotor core; and two or more permanent magnets in the two or more insertion holes; and each of the permanent magnets is in form of rectangle with two opposite sides substantially parallel to a radial direction of the rotor on a surface vertical to a rotation axis of the rotor, and is in form of rectangular parallelepiped with four longitudinal edges parallel to the rotation axis, and the permanent magnet has at least one angular portion of four angular portions containing the four longitudinal edges. | 05-16-2013 |
20130119812 | ROTOR AND MOTOR - A rotor according to an aspect of the present invention includes columnar rotor core; and permanent magnets arranged side by side along predetermined polar pitch angle in circumferential direction of rotor core when viewed from sight line including axial center of rotor core. The rotor core is formed with openings formed in outer peripheral surface of rotor core and having permanent magnets inserted thereinto; interpole-forming-grooves formed by pair of first and second grooves that each extend in direction of axial center on both circumferential sides of openings, and formed in the same number as the number of magnetic poles; interpole formed between first groove and second groove adjacent to first groove; and rib formed between opening and interpole-forming-groove, in yoke-portion of rotor core. The rib is formed with stress-absorbing-portion made from thin-walled-portion with smallest thickness in yoke-portion in cross-sectional view of cross-section including axial center of rotor. | 05-16-2013 |
20130147304 | MOTOR - Disclosed is a motor including a stator having coils and a rotor rotated with respect to the stator, wherein the rotor is provided with a plurality of flux barriers arranged at intervals in a circumferential direction to restrain detouring of magnetic flux in the rotor, a permanent magnet is fitted in each of the flux barriers, and variable magnetic resistance members, magnetic resistance of which increases with increasing temperature, are provided at areas of the rotor closer to the stator than the flux barriers. | 06-13-2013 |
20130154425 | ROTOR FOR ELECTRIC MOTOR - A rotor core is provided in which a plurality of poles each composed of a pair of first permanent magnets arranged in a V-shape open toward an outer peripheral side and a second permanent magnet arranged in parallel to a circumferential direction in an open part of the V-shape are arranged in the circumferential direction while alternately changing the polarities thereof. A groove is formed which has a groove center in a range between an electrical angle position shifted by ¼ cycle of a harmonic component of an induced voltage toward a d-axis and an electrical angle position shifted by ⅛ cycle of the harmonic component toward a q-axis from a base point located between a line connecting a rotor outer peripheral side corner portion of the second permanent magnet and a rotor shaft center and the q-axis out of a plurality of dividing lines connecting a plurality of dividing points set at an electrical angle interval corresponding to one cycle of the harmonic component from the d-axis to the q-axis on the rotor core outer periphery and the rotor shaft center. | 06-20-2013 |
20130162091 | ROTATIONAL ELECTRIC MOTOR AND ROTOR THEREOF HAVING STRUCTURE FOR PREVENTING LAMINATED CORE FROM BEING DAMAGED - A rotor of a rotational electric motor including a core formed from laminated magnetic steel sheets, and a plurality of magnet arrays extending in a laminating direction of the core is provided. Magnets forming each of the plurality of magnet arrays are selected from first magnets and second magnets. A ratio of the length of the first magnet to that of the second magnet is one to two. The magnet arrays are arranged such that they include at least two of the second magnets and boundary planes between the magnets are offset relative to each other so as not to coincide with each other in a direction perpendicular to the laminating direction. | 06-27-2013 |
20130169101 | Permanent Magnet Rotor With Intrusion - A rotor for an electric machine is provided that includes a magnet and a non-magnetic region located adjacent the magnet. The non-magnetic region has an intrusion extending into the non-magnetic region. | 07-04-2013 |
20130181567 | HYBRID SYNCHRONOUS MOTORS AND CURRENT-ENERGIZED SYNCHRONOUS MOTORS SUITABLE FOR VEHICLE DRIVES - Laminated rotor ( | 07-18-2013 |
20130241339 | LAMINATION STACK FOR AN ELECTRICAL MACHINE ROTOR AND ASSOCIATED METHOD OF MAKING - An electrical machine permanent magnet rotor (and associated method of making) includes a plurality of disc-shaped laminations arranged in a stacked configuration. Each of the laminations has a plurality of magnetic material slots circumferentially spaced around a peripheral portion thereof. A first set of the slots on each lamination has a material bridge between a radial end of the slot and an outer circumferential edge of the lamination. A second set of the slots on each lamination have a radial end that extends to the outer circumferential edge of the lamination and is void of the material bridge. | 09-19-2013 |
20130249342 | Cantilevered Rotor Magnet Support - A multilayer laminated rotor mountable on a shaft for rotation relative to a stator of a rotary electric machine arrangement has a plurality of laminas joined together to form the rotor and voids for receiving magnets. The rotor has an annular section, extending between a shaft opening for receiving the shaft and a radially outer circumferential rotor surface, which includes an undulating series of the voids in void groups extending from the radially outer circumferential rotor surface inwardly toward the shaft opening and then back toward the radially outer circumferential rotor surface. A pair of distal voids in each void group, together with distal voids of adjacent void groups, define gaps separating adjacent arc sections of the radially outer circumferential rotor surface. Such an arrangement forces the structural support to be cantilevered, improving rotor integrity, and, due to a reduction in magnetic leakage pathways, provides improved electrical performance. | 09-26-2013 |
20130278106 | ROTOR ASSEMBLY - According to a preferred embodiment of the present invention, in a structure in which a permanent magnet is embedded radially outwardly from a rotor portion, a pair of permanent magnets is embedded in a V-letter shape and a slit in a longitudinal direction is radially formed between the pair of permanent magnets. According to the preferred embodiment of the present invention, it is possible to implement relatively higher torque performance while minimizing the number of permanent magnets embedded in an interior permanent synchronous machine (IPMSM). | 10-24-2013 |
20130285500 | ROTOR FOR A MOTOR AND A MOTOR - A first rotor and a second rotor in which first steel plates in which a plurality of first through holes into which magnets are inserted are formed circumferentially apart from each other are laminated such that the first through holes are axially continuous, a second steel plate in which second smaller through holes are formed. circumferentially apart from each other and is laminated axially at one end side, and the magnet inserted into each of the first through holes of the first and second rotor, The first and second rotor are connected to the same shaft such that the second steel plates serve as the outer sides in the axial direction and the position in the circumferential direction of each of the first through hole is shifted. | 10-31-2013 |
20130313937 | Rotor Lamination Stress Relief - A multilayer laminated rotor is mountable on a shaft for rotation relative to a stator of a rotary electric machine arrangement. The rotor has a plurality of laminas, joined together, and voids for receiving magnets. An annular rotor section, which surrounds a shaft opening within which the shaft is receivable, extends between the shaft opening and a radially outer circumferential rotor surface. The annular section mentioned includes an undulating series of the voids in void groups extending from the radially outer circumferential rotor surface inwardly toward the shaft opening and then back toward the radially outer circumferential rotor surface, as well as a solid radially interior portion without any of the voids. Distal voids in the void groups include curved, arcuate, or recurved stress relieving features extending inwardly from radially innermost corner locations of the distal voids. | 11-28-2013 |
20130320798 | SYSTEM AND METHOD FOR REDUCING COGGING TORQUE IN AN INTERIOR PERMANENT MAGNET MOTOR - An interior permanent magnet motor comprises a rotor assembly disposed within a stator assembly. The rotor assembly is configured for rotating about a central axis relatively to the stator assembly. The rotor assembly defines a plurality of magnet pockets within the rotor assembly along a radially outboard surface of the rotor assembly. Each magnet pocket is substantially rectangular in cross-sectional shape and is configured to facilitate insertion of a permanent magnet into, and retention of the permanent magnet within, the magnet pocket. The rotor assembly further defines at least one rotor notch disposed between each magnet pocket and the radially outboard surface. | 12-05-2013 |
20140015364 | ROTOR FOR IPM MOTOR, AND IPM MOTOR EQUIPPED WITH SAME - A rotor iron core is used, which is formed by laminating a base steel sheets with a magnetic flux density (B8000) of 1.65 T or more as measured at a magnetic field strength of 8000 A/m and a coercivity of 100 A/m or more. | 01-16-2014 |
20140021820 | ROTOR AND ROTARY ELECTRIC MACHINE USING THE SAME - A first rotor core including a plurality of gaps penetrating through the first rotor core along an axial direction is provided. A second rotor core being in contact with an axial end of the first rotor core and having a plurality of magnet-housing slots facing the gaps is also provided. The gaps have a magnetic resistance lower than that of the magnet-housing slots. | 01-23-2014 |
20140035421 | ROTOR OF ROTARY ELECTRIC MACHINE - A rotor of a rotary electric machine includes a rotor core, a plurality of magnet groups, and a plurality of grooves provided between adjacent slot groups. A circumferential rib is provided at a first position on an outer circumferential surface of each of the magnets. A radial direction rib is provided at a second position on a circumferential direction surface of each of the magnets. A curved rib connects the circumferential rib and the radial direction rib, and has an inner surface and an outer surface both being curved in an circular arc shape. The circumferential rib, the curved rib, and the radial direction rib are spaced apart from the outer circumferential surface, the outer circumferential corner, and the circumferential direction surface of each of the magnets. | 02-06-2014 |
20140042861 | ROTOR YOKE AND MOTOR APPLYING ROTOR YOKE - A rotor yoke includes plural rotor cores having a disk shape laminated to be formed in a cylindrical shape, plural magnet inserting holes each including a longitudinal side and a transverse side, penetrated in a laminating direction of the rotor yoke, a bridge portion arranged between the magnet inserting holes adjacent to one another in a circumferential direction of the rotor cores and connecting an inner area to an outer area, a recessed portion arranged at the bridge portion and formed from the outer circumferential surface of the rotor cores toward radially inward and a protruding edge protruding toward an inside of the magnet inserting hole. | 02-13-2014 |
20140077653 | ROTOR FOR ROTATING ELECTRIC MACHINE - A rotor includes a rotor core having a plurality of pairs of magnet-receiving holes and a plurality of magnets respectively received in the magnet-receiving holes. Each pair of the magnet-receiving holes is arranged in a substantially V-shape that opens toward a stator side. The rotor core has, for each of the magnet-receiving holes, a magnetic flux barrier that is formed, at a magnetic pole centerline-side end of a stator-side wall surface of the magnet-receiving hole, so as to protrude from the stator-side wall surface toward the stator side. The protruding height H of the magnetic flux barrier from the stator-side wall surface is set to be in the following range: 0.12×R≦H 0.29×R, where R is the minimum distance from an intersection P1, which is between the magnetic pole centerline and a rotor-side circumferential surface of the stator, to the stator-side wall surface of the magnet receiving hole. | 03-20-2014 |
20140084735 | PERMANENT MAGNET-EMBEDDED MOTOR AND ROTOR THEREOF - In a rotor of a permanent magnet-embedded motor, a plurality of permanent magnets is arranged in one magnet housing of a rotor core. A rib portion which connects an outer peripheral portion of the rotor core with an inner peripheral portion of the rotor core is arranged per plurality of magnetic poles. | 03-27-2014 |
20140091664 | INTERIOR PERMANENT MAGNET ELECTRIC ROTATING MACHINE - An electric rotating machine comprises a stator adapted for receiving stator windings; a rotor rotatable relative to the stator; permanent magnets in the rotor forming magnetic poles; and apertures with a low permeability. Each aperture is for that portion of one of the permanent magnets located in a predetermined range which would generate magnetic flux lines in such directions as to cancel magnetic flux lines emanating from the stator in the neighborhood of a direct axis of one of the magnetic poles if the permanent magnet were located in the predetermined range. | 04-03-2014 |
20140111053 | ROTATING ELECTRICAL MACHINE - The disclosure discloses a rotating electrical machine including a stator and a rotor. The rotor includes a cylindrical iron core that is fixed to a shaft and comprises a radial direction and an axial direction, a plurality of permanent magnets that is embedded in the iron core, a plurality of air gaps that are respectively provided in a portion on an inner side of the iron core in the radial direction, a wedge portion that is provided along the axial direction so as to protrude within the air gap, and a non-magnetic reinforcing member that is filled in the air gap. | 04-24-2014 |
20140125183 | ROTOR FOR ROTATING ELECTRIC MACHINE - A rotor includes a rotor core having a plurality of pairs of magnet-receiving holes and a plurality of magnets respectively received in the magnet-receiving holes. Each pair of the magnet-receiving holes is arranged in a substantially V-shape that opens toward a stator side. For each pair of the magnet-receiving holes, there are provided a pair of corresponding magnetic flux barriers and a corresponding center bridge. The corresponding magnetic flux barriers are formed so as to respectively extend radially inward from magnetic pole centerline-side ends of the pair of the magnet-receiving holes. The corresponding center bridge radially extends between the corresponding magnetic flux barriers to separate them from each other. The corresponding center bridge is configured to include a radially inner portion and a radially outer portion located radially outward of the radially inner portion. The radially inner portion has a greater circumferential width than the radially outer portion. | 05-08-2014 |
20140125184 | ROTOR FOR ROTATING ELECTRIC MACHINE - A rotor includes a rotor core in which a plurality of magnet housing holes are arrayed in a circumferential direction and a plurality of magnets fixed and held in the magnet housing holes by a filler material. The rotor core includes: a q-axis core portion, an outer flux bather that is formed between the q-axis core portion and the magnet and is filled with the filler material; and a bridge portion formed between a stator-side core portion and the q-axis core portion. The bridge portion includes a large-width portion, a small-width portion and a medium-width portion that are sequentially disposed from the q-axis core portion side towards the stator-side core portion side in the circumferential direction. The large-width portion has the largest radial-direction width. The small-width portion has the smallest radial-direction width. The medium-width portion has a medium radial-direction width between the largest radial-direction width and the smallest radial-direction width. | 05-08-2014 |
20140145538 | ROTOR FOR ROTATING ELECTRIC MACHINE - A rotor includes a rotor core and a plurality of magnetic pole parts. The rotor core has a magnet insertion hole. The magnet insertion hole includes a first peripheral edge portion and a second peripheral edge portion spaced away from the first peripheral edge portion in a radial direction of the rotor. The rotor core includes a holding part and a protrusion. The holding part extends along the radial direction from the first peripheral edge portion of the magnet insertion hole. The holding part abuts against a circumferential end portion of each of the plurality of permanent magnet pieces. The protrusion extends toward the second peripheral edge portion of the magnet insertion hole. The protrusion is spaced away in the radial direction from the second peripheral edge portion of the magnet insertion hole. | 05-29-2014 |
20140145539 | PERMANENT MAGNET SYNCHRONOUS ELECTRIC MACHINE - Disclosed is a permanent magnet synchronous electric machine, comprising a stator ( | 05-29-2014 |
20140159532 | MULTI-GAP TYPE ROTARY ELECTRIC MACHINE - A multi-gap type rotary electric machine is provided, where the machine is provided a shaft supported rotatably by a baring secured to a housing. An annular rotor is secured to the shaft and configured to rotate together with the shaft. Double stators are secured to the housing and configured to have gaps between the stators and the rotor. Relationships of: | 06-12-2014 |
20140159533 | MULTI-GAP TYPE ROTARY ELECTRIC MACHINE - A multi-gap type rotary electric machine is provided, where the machine is provided a shaft supported rotatably by a baring secured to a housing. An annular rotor is secured to the shaft and configured to rotate together with the shaft. Double stators are secured to the housing and configured to have gaps between the stators and the rotor. Relationships of: | 06-12-2014 |
20140159534 | ROTATING ELECTRIC MACHINE - A rotating electric machine is equipped with a consequent-pole type rotor that includes a magnetic pole having a permanent magnet buried therein and a soft magnetic material pole that interposes two magnetic poles. The thickness of the permanent magnet and a circumferential width of the soft magnetic material pole have a relationship that prevents a spread of magnetic flux distribution in the circumferential direction within a gap between the soft magnetic material pole and a stator. As a result, a magnetic flux density difference in the circumferential direction is prevented, which enables a reduction of cogging torque based on an effective reduction of low-frequency space order components that originate from components other than a main component. | 06-12-2014 |
20140159535 | PERMANENT MAGNET ROTORS AND METHODS OF ASSEMBLING THE SAME - A permanent magnet rotor includes at least one permanent magnet and a rotor core including a first end and a second end. The rotor core includes a plurality of permanent magnet openings that are each configured to receive a permanent magnet. The permanent magnet rotor also includes a first rotor end lamination coupled to the first rotor core end. The first rotor end lamination includes a plurality of inner lamination walls defining a first lamination opening and a second lamination opening circumferentially adjacent the first lamination opening. At least one inner lamination wall includes at least one permanent magnet retention feature configured to secure the permanent magnet within a corresponding permanent magnet opening. The at least one permanent magnet retention feature includes at least one tab extending radially from at least one of the plurality of inner lamination walls within the first rotor end lamination. | 06-12-2014 |
20140167551 | ROTOR OF INTERNAL PERMANENT MAGNET SYNCHRONOUS MOTOR AND INTERNAL PERMANENT MAGNET SYCNRONOUS MOTOR - A rotor of an internal permanent magnet synchronous motor including a rotor core, a plurality of slots formed in the rotor core, and a plurality of permanent magnets housed in the plurality of slots. Each of the slots includes a holding part formed between a first outside diameter surface and a first inside diameter surface to hold each of the permanent magnets, and an opening part formed at both sides of the holding part and formed by a second outside diameter surface, a second inside diameter surface and a connecting surface connecting them. The second outside diameter surface is formed to a curved shape so that a distance to an outer circumferential surface of the rotor core in the diametrical direction gradually becomes smaller from both ends of the second outside diameter surface to an intermediate part in the circumferential direction. | 06-19-2014 |
20140167552 | ROTOR FOR AN ELECTRIC MACHINE COMPRISING RECESSES IN MAGNET POCKETS | 06-19-2014 |
20140184009 | ROTATING ELECTRIC MACHINE - A motor is provided having a consequent-pole type rotor that has soft magnetic material poles and magnetic poles positioned around the rotor in an alternating manner. A convex surface on each of the poles is formed as a surface in which a midpoint of the convex surface has a radial distance from the rotation axis that is greater than a radial distance of the circumferential edges of the convex surface from the rotation axis. A radial width of a first magnetism transfer part of a cylindrical yoke and a radial width of a second magnetism transfer part of the magnetic pole fulfill a relationship such that an appropriate balance of the magnetic resistance between the first magnetism transfer part and the second magnetism transfer part is achieved. As a result, cogging torque is reduced without reducing output torque. | 07-03-2014 |
20140210296 | ROTOR FOR PERMANENT MAGNET TYPE MOTOR, METHOD OF MANUFACTURING ROTOR FOR PERMANENT MAGNET TYPE MOTOR, AND PERMANENT MAGNET TYPE MOTOR - A rotor for a permanent magnet type motor has rotor core blocks in a multistage in an axial direction in which permanent magnets of a plurality of magnetic poles are incorporated, and has a stage skew structure in which the rotor core blocks of each stage are integrally formed so as to be shifted from each other in a rotational direction. The rotor core blocks of each stage have a flux barrier portion for blocking a short circuit magnetic flux between the magnetic poles, between the magnetic poles of the permanent magnet. A skew angle is set so that the flux barrier portions of the magnetic poles between the adjacent stages at least partially overlap each other in the rotor core blocks of different stages. | 07-31-2014 |
20140217848 | INTERIOR PERMANENT MAGNET MACHINE - An interior permanent magnet machine includes a stator including a plurality of electrical conductors. The interior permanent magnet machine further includes a rotor concentrically disposed in relation to the stator. The rotor is configured to rotate relative to the stator about a rotational axis and includes a plurality of polar pieces arranged annularly about the rotational axis. At least one of the polar pieces includes a magnetic layer configured to magnetically interact with the electrical conductors. The magnetic layer has a substantially conic section shape. | 08-07-2014 |
20140217849 | ROTOR FOR ROTARY ELECTRIC MACHINE - A rotor for a rotary electric machine includes a plurality of magnetic poles in a rotor core, a side barrier as a magnetic air gap, an air gap section as a magnetic air gap. Each of the plurality of magnetic poles includes a magnet insertion hole, a permanent magnet. The side barrier is provided at a portion adjacent to a circumferential end face of the permanent magnet and includes a projection barrier portion projecting radially outwardly from an extension line extending from an outer peripheral surface of the permanent magnet. The air gap section is provided at an area which is spaced apart from the projection barrier portion and the magnet insertion hole and faces a peripheral edge of a circumferentially central side of the magnetic pole with respect to the projection barrier portion and a circumferential end of the outer peripheral surface of the permanent magnet. | 08-07-2014 |
20140232232 | ROTARY ELECTRIC MACHINE - A rotary electric machine includes a rotor, and a stator. The rotor includes poles having slots and magnets. Each of the slots includes a first housing hole, a pair of second housing holes, a pair of first ribs, a pair of second ribs, and an area of a first space. The first housing hole is disposed near an outer periphery of the rotor to be substantially parallel with an outer peripheral surface of the rotor. The pair of second housing holes are provided symmetrically with respect to the first housing hole to be inclined toward the outer periphery away from the first housing hole. The pair of first ribs are each provided between the first housing hole and each of the pair of second housing holes. The pair of first ribs are each provided between the first housing hole and each of the pair of second housing holes. | 08-21-2014 |
20140252903 | INTERIOR PERMANENT MAGNET MACHINE HAVING A MIXED RARE EARTH MAGNET AND FERRITE MAGNET ROTOR - A rotor core for an internal permanent magnet machine includes at least one ferrite pole and at least one rare earth pole, arranged radially about an axis in alternating relationship. The ferrite poles define a plurality of first pole cavities, and the rare earth poles define a plurality of second pole cavities. One of a plurality of ferrite magnets is disposed within each of the first pole cavities of the ferrite poles, and one of a plurality of rare earth magnets is disposed within each of the second pole cavities of the rare earth poles. | 09-11-2014 |
20140265707 | INTERIOR PERMANENT MAGNET MOTOR WITH SHIFTED ROTOR LAMINATIONS - A rotor comprises a first rotor lamination and a second rotor lamination. The first rotor lamination and the second rotor lamination are configured for defining, when joined into rotor assembly, a central axis of rotation and a plurality of interior magnet pockets disposed symmetrically about the central axis of rotation, each pocket of the plurality of interior magnet pockets is configured for housing and retaining a permanent magnet. A method of forming a rotor comprises forming a first rotor lamination and a second rotor lamination, rotating the second rotor lamination about an axis of symmetry of the second rotor lamination; and mating the first rotor lamination to the second rotor lamination such that a first notch of the first rotor lamination is disposed adjacent to the first notch of the second rotor lamination. | 09-18-2014 |
20140285049 | MAGNET-EMBEDDED ROTOR, METHOD FOR MANUFACTURING MAGNET-EMBEDDED ROTOR, AND ORIENTATION AND MAGNETIZATION DEVICE - A magnet-embedded rotor includes a cylindrical rotor core that rotates together with a rotating shaft; and permanent magnets embedded in the rotor core. The rotor core includes core members, and each core member includes a tubular portion into which the rotating shaft is inserted and projecting portions formed to project in a radial direction of the tubular portion from an outer periphery of the tubular portion and arranged apart from each other in a circumferential direction of the tubular portion. The rotor core is formed by assembling the core members such that the tubular portions are arranged on one straight line and the projecting portion of the core member and the projecting portion of the other core member are adjacent to each other in a circumferential direction of the rotor core. The permanent magnet is embedded in each projecting portion of each core member. | 09-25-2014 |
20140346911 | ROTOR - A rotor includes a rotor iron core in which magnet insertion holes that are arrayed in a radial direction so as to be convex toward an inner peripheral side are provided for each magnetic pole, and in which the magnet insertion holes are arranged in a circumferential direction according to the number of magnetic poles, and flat-shaped permanent magnets that are inserted respectively in the magnet insertion holes, wherein the magnet insertion holes, which are arranged on an innermost peripheral side and adjacent to each other in a circumferential direction are provided in such a manner that the width of the magnet insertion hole gradually becomes larger toward the inner peripheral side such that the width of the iron core between the adjacent magnet insertion holes in a circumferential direction is constant in a radial direction. | 11-27-2014 |
20140354105 | CONSTRUCTION ARRANGEMENT OF A PERMANENT MAGNET ROTOR FOR A GENERATOR - Construction arrangement of a permanent magnet rotor in an electric machine that comprises a plurality of notches having permanent magnets inserted axially to form the poles of the electric machine. The magnetic magnets are arranged in the notches made in the geometry of the magnetic plate constituting the mechanical structure of the rotor. The axial notches divide the geometry of the rotor stacked plate into two areas separated by a narrow magnetic strip known as the bridge, through which the dispersion magnetic flux is regulated. The dispersion magnetic flux established thereby is reduced by at least 20% because of the recess on the mentioned bridge. | 12-04-2014 |
20140375165 | CORE OF ROTATING ELECTRICAL MACHINE HAVING FIXING AGENT FOR FIXING PERMANENT MAGNETS IN ACCOMMODATING SLOTS AND METHOD FOR MANUFACTURING THE CORE - A core has accommodating slots each accommodating a permanent magnet. A fixing agent is injected into the space between the inner surface of each accommodating slot and the outer surface of the associated permanent magnet. A liquid-crystal polymer is used as the fixing agent. More specifically, liquid-crystal polyester is used. | 12-25-2014 |
20150022044 | SYSTEM AND METHOD FOR REDUCING TORQUE RIPPLE IN AN INTERIOR PERMANENT MAGNET MOTOR - An interior permanent magnet motor comprises a rotor assembly disposed within a stator assembly. The rotor assembly is configured for rotating about a central axis relatively to the stator assembly. The rotor assembly defines a plurality of magnet pockets within the rotor assembly along a radially outboard surface of the rotor assembly. Each magnet pocket is substantially rectangular in cross-sectional shape, and each magnet pocket is configured to facilitate insertion of a plurality of permanent magnets into and retention of the plurality of permanent magnets within, the magnet pocket. The rotor assembly further comprises a plurality of permanent magnet segments disposed in each magnet pocket. | 01-22-2015 |
20150061447 | PERMANENT MAGNET-EMBEDDED TYPE ROTARY ELECTRIC MACHINE - Magnetic flux short-circuit preventing slits extend from opposite ends of two permanent magnets in an outer circumferential surface of a rotor toward a center of a magnetic pole. Grooves formed in the outer circumferential surface can be located at a distance from each other symmetrically with respect to the center of the magnetic pole and at a distance from a groove of an adjacent magnetic pole in the outer circumferential surface. Relations are established as θf=n×τs and θs=n×τs where τs designates a pitch of stator winding slots, which pitch is converted into an angle around a rotation center, θf designates an angle between the magnetic flux short-circuit preventing slits, θs designates an angle between the grooves, and n designates a predetermined integer. Thereby, a permanent magnet-embedded type rotary electric machine in which the influence of a manufacturing error can be minimized so that cogging torque can be reduced stably. | 03-05-2015 |
20150084468 | ROTOR FOR PERMANENT-MAGNET-EMBEDDED ELECTRIC MOTOR, ELECTRIC MOTOR INCLUDING THE ROTOR, COMPRESSOR INCLUDING THE ELECTRIC MOTOR, AND AIR CONDITIONER INCLUDING THE COMPRESSOR - A rotor for a permanent-magnet-embedded electric motor includes slit holes each axially formed near opposite ends of a magnetic pole between an outer peripheral face of a rotor core and a magnet insertion hole, and forming a symmetrical shape in an approximately truncated chevron shape along the outer peripheral face of the rotor core, based on a centerline of each of the magnetic poles, wherein a thickness of each of permanent magnets is set to be twice or more of an air gap, a width of a shortest magnetic path in which a distance between the slit hole and the permanent magnet becomes shortest is set to be twice or more of the air gap, and an inclination of the slit hole with respect to a width direction of the permanent magnet orthogonal to a radial direction is set to be in a range from 0 to 30 degrees. | 03-26-2015 |
20150084469 | ROTOR FOR ROTARY ELECTRIC MACHINE - A rotor for a rotary electric machine includes a rotor core being rotatable around a rotational axis. The rotor core includes a plurality of steel plates stacked in a stacking direction. Each of the plurality of steel plates includes a plurality of magnet insertion piece holes, a plurality of through piece holes, a radially inner side annular ring, a radially outer side annular ring, and a plurality of ribs. The plurality of magnet insertion piece holes are provided at every first circumferential space. The plurality of magnet insertion piece holes constitute a plurality of magnet insertion holes in a state in which the plurality of steel plates are stacked in the stacking direction while the plurality of steel plates are rotated by the first circumferential space at every timing at which a predetermined number of the plurality of steel plates are stacked in the stacking direction. | 03-26-2015 |
20150102695 | ELECTRIC MACHINE - An electric machine includes a stator core, a rotor core, a shaft and at least one pair of magnets. The stator core surrounds the stator core. The rotor core enfolds the shaft and includes at least one groove. The groove includes a pair of sub-grooves. The sub-grooves define an angle α therebetween. The angle α satisfies: α<180°. The magnets are respectively accommodated in the sub-grooves of the groove. | 04-16-2015 |
20150137648 | VARIABLE MAGNETOMOTIVE FORCE ROTARY ELECTRIC MACHINE AND CONTROL DEVICE FOR VARIABLE MAGNETMOTIVE FORCE ROTARY ELECTRIC MACHINE - A rotary electric machine includes a stator and a rotor. The rotor has at least one permanent magnet arranged in a d-axis magnetic path. The rotor includes a magnetic gap part located between the permanent magnet arranged in the d-axis magnetic path of one pole and an adjacent magnet with a different polarity, such that a d-axis magnetic flux forms a d-axis bypass passing through an area other than the permanent magnet. The d-axis bypass provides a magnetic resistance in a d-axis direction that is set below a magnetic resistance in a q-axis direction that is orthogonal to the d-axis resistance. | 05-21-2015 |
20150137649 | METHOD FOR PRODUCING A ROTOR AND ELECTRIC MACHINE HAVING A ROTOR - A method produces a rotor which can rotate about a rotation axis, in particular for an electrical machine of a motor vehicle. At least two rotor body elements are each provided with a number of receiving pockets which are made in an axial direction. Magnet bodies are in each case pressed into the receiving pockets in the rotor body elements with an axial press-in direction. The rotor body elements are joined to one another in such a way that the press-in directions of the magnet bodies point away from one another. Additionally, an electrical machine has a rotor which is produced in this manner. | 05-21-2015 |
20150145371 | MOTOR - A motor includes a cylindrical stator having a hollow, and a rotor rotatably arranged inside the stator. The rotor includes a cylindrical rotor body, a permanent magnet group provided to the rotor body to generate a magnetic field, and a flux barrier group to interrupt magnetic flux. The rotor body, the permanent magnet group and the flux barrier group are asymmetrically formed with respect to a center of poles of the rotor. | 05-28-2015 |
20150295462 | ROTOR FOR A ROTARY ELECTRIC MACHINE - A rotor for a rotary electric machine includes a rotor core which is formed by crimping laminated steel plates so as to be opposed to a stator, and has pairs of magnet housing holes disposed in a V shape, and pairs of magnets housed in the magnet housing holes. The rotor core has a crimped portion formed in a q axis core portion positioned between the two magnet poles, which are adjacent to each other in a circumferential direction, a first flux barrier formed between the q axis core portion and the magnet, and a pair of second flux barriers which enlarges from an end positioned at a center side of the magnet pole of the magnet housing holes toward a central axis of the rotor core. The crimped portion is formed so that distances between the crimped portion and both the first and second flux barriers are equal. | 10-15-2015 |
20150318742 | ELECTRIC MACHINES, STATORS AND COMPRESSORS AND METHODS OF MANUFACTURING SAME - A method of manufacturing dynamoelectric machines includes producing a first plurality and a second plurality of stator and rotor laminations using a die press, forming a first rotor from the first plurality of rotor laminations, and forming a second rotor from the second plurality of rotor laminations. The first plurality and the second plurality of stator laminations have the same inner and outer diameters. The first plurality and the second plurality of rotor laminations have the same inner and outer diameters. The first plurality of rotor laminations have a first magnet slot configuration and the second plurality of rotor laminations have a second magnet slot configuration different than the first magnet slot configuration. The first rotor and the second rotor may have the same or different stack heights. Preferably, a ratio of each stator lamination's inner diameter to outer diameter is at least 60%. | 11-05-2015 |
20150333583 | ELECTRICAL MACHINE AND METHOD FOR PRODUCING AN ELECTRICAL SHEET - An electrical machine with a rotor which has at least one electrical sheet. The electrical sheet having crosspieces, wherein the crosspieces have a deformation in a direction normal to the plane of the electrical sheet. | 11-19-2015 |
20150380995 | EMBEDDED PERMANENT MAGNET TYPE ROTATING ELECTRIC MACHINE - An embedded permanent magnet type motor, which has one pole configured of two permanent magnets and has a plurality of poles of permanent magnets embedded in a rotor, includes a rotor whose magnet embedding holes communicate with a rotor outer periphery. The rotor has, between adjacent poles, a q-axis projection projecting in a direction away from a rotor rotation center. The magnet embedding holes are disposed so as to form an inverted V shape. An outer peripheral edge portion on the outer side of the permanent magnets has a curvature radius smaller than the distance from a rotation center axis to a rotor outermost peripheral portion. Circular intermediate plates of an outside diameter larger than the outside diameter of rotor steel plates are provided in intermediate positions in the rotor in a rotor rotation axis direction. | 12-31-2015 |
20160036274 | ROTORS AND STATORS FOR DYNAMOELECTRIC MACHINES - A dynamoelectric machine includes a rotor having a rotor core and permanent magnets, and a stator having teeth. The permanent magnets are arranged in magnet sets. Each magnet set includes one or more of the permanent magnets. The rotor core has a cylindrical periphery and slits. Each of the slits is positioned radially between one of the magnet sets and the cylindrical periphery. Each tooth includes a tooth surface facing the cylindrical periphery. The tooth surface includes an inner portion extending substantially parallel to the cylindrical periphery of the rotor core, and beveled portions positioned on opposing sides of the inner portion of the tooth surface. An air gap between each beveled portion of the tooth surface and the cylindrical periphery of the rotor core is greater than an air gap between the inner portion of the tooth surface and the cylindrical periphery of the rotor core. | 02-04-2016 |
20160079817 | ROTOR FOR ROTATING ELECTRIC MOTOR, AND ROTOR MANUFACTURING METHOD - This rotor for a rotating electric motor includes a hollow cylindrical rotor core with a plurality of laminated electromagnetic steel plates. The inner and outer circumferential surfaces of the rotor core each face a magnetic gap. The rotor core is interposed between a first rotating support member and a second rotating support member. A flange is formed on a first end of a tubular pin protruding from a first hole of the first rotating support member. A tubular expansion part of the tubular pin plastically deforms due to fluid pressure so as to come into close contact with a through hole of the rotor core, the first hole of the first rotating support member, and a second hole of the second rotating support member. | 03-17-2016 |
20160094097 | ROTOR - A rotor includes a stacked body including stackable steel plates each formed by punching multiple magnet insertion holes in a steel plate with an insulation film at regular intervals in the circumferential direction and stacked in the rotational axis extending direction; and magnets disposed in the magnet insertion holes. A peripheral edge of each magnet insertion hole is provided with a projection projecting toward the magnet. The stackable steel plates constituting the stacked body include first and second stackable steel plates having the same shape, and are stacked such that the second stackable steel plate is in at least one of a rotation relation about the rotational axis and a turn-over relation with the first stackable steel plate such that the projections adjacent to each other in the circumferential direction are arranged at positions offset from each other in the stackable steel plate stacking direction. | 03-31-2016 |
20160134163 | ROTOR STRUCTURE - In a rotor structure including a leak prevention hole formed in a rotor core to prevent leakage of magnetic flux from a permanent magnet; an outer-circumferential-side dovetail groove formed in an outer-circumferential-side inner wall of the leak prevention hole, an inner-circumferential-side dovetail groove formed, opposite the outer-circumferential-side dovetail groove, in an inner-circumferential-side inner wall of the leak prevention hole; and a non-magnetic bridge having both end portions engageable with the dovetail grooves. The non-magnetic bridge is formed with a chamfer at only one end face of both end faces in an axial direction of the rotor core. The non-magnetic bridge includes two or more non-magnetic bridges. The non-magnetic bridges are arranged so that the end faces formed with the chamfers are alternately located at the one end face of the rotor core. | 05-12-2016 |
20160141926 | Rotary Electrical Machine, and Rotor for Rotary Electrical Machine - There is provided a rotor for a rotary electrical machine for improving mechanical strength of the rotor against centrifugal force. The rotary electrical machine is provided with a stator, and a rotor disposed with a gap from the stator, which has a rotor core. The rotor includes a magnet insertion hole, and a permanent magnet inserted into the magnet insertion hole. A clearance part is formed at a position of the magnet insertion hole corresponding to a corner of the inserted permanent magnet, which has a facing surface that is formed to face a surface of the permanent magnet via a gap. The facing surface of the clearance part has inflection points so that each of obtuse angles is formed by the two facing surfaces contiguous with the inflection points. | 05-19-2016 |
20160190879 | INTERIOR-PERMANENT-MAGNET MOTOR STRUCTURE - An interior-permanent-magnet motor structure includes an air gap having the form of an annular band. The air gap is positioned between the stator and the rotor. The width of the annular band of the air gap has a maximum value and a minimum value within each pole pitch range. Accordingly, the air gap magnetic flux is nearly in sine wave state. | 06-30-2016 |
20160204664 | PERMANENT MAGNET ROTOR WITH INTRUSION | 07-14-2016 |
20160254712 | ROTOR WITH EMBEDDED PERMANENT MAGNETS, ASSEMBLY STRUCTURE AND MOTOR COMPRISING THE SAME | 09-01-2016 |
20220140675 | MOTOR - Provided is a motor capable of suppressing reduction of the torque of the motor even if the amount of use of the permanent magnets embedded in the rotor core is reduced. A motor includes a rotor with permanent magnets embedded in a rotor core, and a stator positioned on an outer circumference of the rotor. The rotor includes magnetic poles formed around a rotation axis of the rotor, the magnetic poles having the permanent magnets arranged therein. The permanent magnets in adjacent magnetic poles are arranged such that positions of a north pole and a south pole of the permanent magnet in one magnetic pole are inverted from those of the permanent magnet in a magnetic pole adjacent to the one magnetic pole. The permanent magnets each have a residual magnetization that decreases as it moves from the north pole toward the south pole. | 05-05-2022 |