| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 310216074 | Pole structure | 74 |
| 20090243422 | AXIAL GAP TYPE MOTOR - The axial gap type motor according to the present invention is provided with: a rotor and a first stator and a second stator, wherein the first and second stators includes an annular back yoke and a plurality of teeth which is provided on the annular back yoke at predetermined intervals in a peripheral direction so as to protrude toward the rotor in the direction of the rotation axis; the peripheral pitch of the plurality of teeth of the first and second stators are equal to each other; and in a case where the first stator and the second stator which sandwich the rotor therebetween in the direction of the rotation axis are seen from one side in the direction of the rotation axis, facing surfaces of the teeth of the first and second stators which face to the rotor are formed so as not to overlap completely each other. | 10-01-2009 |
| 20100109471 | STATOR FOR A MULTIPLE PHASE ROTARY ELECTRIC MACHINE, MULTIPLE PHASE ROTARY ELECTRIC MACHINE INCLUDING SUCH ROTOR, AND METHOD FOR MAKING SUCH ROTOR - A stator for a multiple-phase rotary electrical machine, in which each phase includes at least one winding, each winding including coils ( | 05-06-2010 |
| 20110101817 | VARIABLE GEOMETRY ELECTRIC MACHINE - A variable geometry electric machine that includes a moveable magnetic member that varies the flux path between a rotor and a stator of the machine depending on the machine speed to control the flux between the rotor and the stator. As the speed of the machine increases, the magnetic member is selectively withdrawn in an axial direction from between the rotor and the stator so that at higher machine speeds, the back EMF of the machine is reduced so that the speed of the machine can be increased. The magnetic member includes spaced apart magnetic strips mounted to a non-magnetic hub. In one embodiment, the magnetic strips are positioned within an air gap between the rotor and the stator and against ends of teeth of the stator, where stator coils are positioned between the teeth. In another embodiment, the magnetic strips are positioned within the teeth of the stator. | 05-05-2011 |
| 20110109190 | ROTARY ELECTRICAL MACHINE - When a conventional technology is employed, it is difficult to manufacture a magnet row because magnets are disposed so that N-poles face each other while S-poles face each other. Further, magnetic reluctance is increased because a generated magnetic flux obliquely crosses an air gap in which the magnets are disposed. Furthermore, the conventional technology is at a disadvantage in that magnetic flux interference occurs between neighboring magnetic poles. The present invention has been made to address the above problems and provide a rotary electrical machine capable of generating high torque at low speed. The rotary electrical machine includes a rotor disc and an armature. The rotor disc is configured so that plural rectangular magnets whose longitudinal direction crosses the direction of rotor disc rotation are disposed on the rotor disc, and that the polarities of neighboring magnets differ from each other. The armature is configured so that plural armature cores are disposed to sandwich the magnets, which are mounted on the rotor disc and provided with a particular magnetic pole, and that a winding is commonly wound between the armature cores. | 05-12-2011 |
| 20110285243 | ROTARY ELECTRIC MACHINE WITH IMPROVED MAGNETIC RESISTANCE - In a motor, an armature includes an annular yoke having an inner surface, and a plurality of teeth radially projecting individually from the inner surface of the annular yoke, and a rotor is rotatably provided inside the armature with a gap between the outer surface thereof and the inner surface of the armature. The armature and rotor is configured to have a first magnetic resistance facilitating reactive magnetic flux to flow through at least one tooth in a plurality of teeth to an adjacent tooth of the at least one tooth therein as compared with the reactive magnetic flux toward the rotor. The armature and rotor is configured to have a second magnetic resistance facilitating main magnetic flux based on the at least one pair of magnetic poles to flow toward a yoke of the armature as compared with the main magnetic flux toward at least one tooth close to the main magnetic flux. | 11-24-2011 |
| 20120126659 | FULL ROUND STATOR ASSEMBLY AND ELECTROMAGNETIC MACHINE HAVING HIGH SLOT FILL - An electromagnetic machine has a rotor and a stator core. The stator core has a plurality of radially-extending teeth and a plurality of bridges having opposite ends secured to corresponding teeth. Stator windings are positioned at least partially in slots between the teeth. Each of the bridges is in a compressed configuration and includes a midsection radially offset from the ends. In a method of making an electromagnetic machine, stator windings are wound around the teeth of the stator core while the stator core is in an expanded configuration in which each of the slots is relatively wider and the configuration of the stator core is changed after winding, for example by compressing or otherwise deforming the bridges, to a compressed configuration in which each of the slots is relatively narrower. The bridges hold the teeth in the expanded configuration facilitating high slot fill without using a segmented stator. | 05-24-2012 |
| 20120139385 | STATOR CORE AND MOTOR - A stator core includes three split cores, each of the split cores including a core-back portion including an inner surface facing a rotor, a tooth base portion protruding radially inwards from the inner surface of the core-back portion and a pair of tooth overhang portions protruding from both sides of a tip end of the tooth base portion in a circumferential direction. The inner surface of the core-back portion including a pair of orthogonal surface regions extending from both sides of a base end of the tooth base portion in a direction orthogonal or substantially orthogonal to the tooth base portion, the orthogonal surface regions extending radially outwards beyond projection positions of tip ends of the tooth overhang portions when the tooth overhang portions are projected on an imaginary plane including the orthogonal surface regions in parallel or substantially in parallel to the tooth base portion. | 06-07-2012 |
| 20120299434 | STATOR OF A PERMANENTLY EXCITED ROTATING ELECTRIC MACHINE - A stator of a permanently excited rotating electric machine has a plurality of segments abutting each other at radially and axially extending segment boundaries. Each segment has a plurality of radially projecting teeth of uniform width and grooves extending in the axial direction and alternatingly arranged in a peripheral direction of the stator. Abutting segments touch each other at the segment boundaries such that an outer tooth of one segment touches an outer tooth of an abutting segment, wherein a sum of the widths of the two teeth touching each other at the corresponding segment boundary is greater than the uniform width of at least a majority of the plurality of teeth of a segment that are not arranged directly at a segment boundary of that segment. Detent moments and/or oscillating moments occurring in a permanently excited rotating electric machine can thereby reduced. | 11-29-2012 |
| 20130119817 | ROTOR OF PERMANENT MAGNET SYNCHRONOUS MOTOR, MOTOR AND MACHINE TOOL | 05-16-2013 |
| 20140001914 | STATOR FOR AN ELECTRIC MOTOR AND METHOD FOR PRODUCING A STATOR FOR AN ELECTRIC MOTOR | 01-02-2014 |
| 20140028147 | Multi-Pole Electrodynamic Machine with a Constant Air Gap And An Elliptical Swash-Plate Rotor To Reduce Back Torque - A Back Torque reducing electrodynamic generator machine is disclosed. Some embodiments include a multi-pole stator comprising field windings and power windings and a rotor having a flux path element. For some embodiments, the flux path element is attached to a rotor shaft at an oblique angle to the longitudinal axis of the shaft. The flux path element has a shape that provides a uniform constant air gap between it and the stator poles when the shaft is rotated. | 01-30-2014 |
| 20150061453 | STATOR CORE FOR ELECTRIC ROTARY APPARATUS - A stator core includes a yoke member and a teeth member. The yoke member is in an annular shape. The teeth member includes teeth and connecting portions. The teeth are projected from the yoke member radially inward. The teeth are formed of a steel plate stacked along a circumferential direction. At least one of the connecting portions connects a part of a tip end of one of the teeth in an axial direction with a part of a tip end of an other of the teeth in the axial direction. The one of the teeth and the other of the teeth are adjacent to each other in the circumferential direction. | 03-05-2015 |
| 20150102700 | ELECTRIC MOTOR CAPABLE OF REDUCING COGGING TORQUE - An electric motor including a rotor including magnetic pole units and a stator including slots facing an outer peripheral surface of the rotor. Each of the magnetic pole units is bulged to an outside in a radial direction so that a waveform of a magnetic flux density generated from the rotor is a sine wave shape, and a concave part or convex part which is small enough to prevent changing of a waveform cycle of cogging torque determined by a least common multiple of the number of slots and the number of magnetic poles of the rotor, is formed at a central part in a circumferential direction of an outer peripheral surface in each of the magnetic pole units. | 04-16-2015 |
| 20160172952 | STEPPING MOTOR AND STATOR THEREOF | 06-16-2016 |
| 20170237303 | Sheet Metal Part or Sintered Part for a Stator or a Rotor of an Electrical Machine and Method for Producing Same | 08-17-2017 |
| 310216075 | Particular to switch reluctant machine | 6 |
| 20100213786 | ELECTRIC MACHINE HAVING A HIGH-TORQUE SWITCHED RELUCTANCE MOTOR - According to one embodiment of the present invention, an electric machine comprises a stator and a rotor. The stator has at least one stator pole with a first leg and a second leg. The rotor has at least one rotor pole. The rotor rotates relate to the stator. The at least one rotor is configured to rotate between the first leg and the second leg of the at least one stator pole. | 08-26-2010 |
| 20110018383 | PERMANENT-MAGNET SWITCHED-FLUX MACHINE - A permanent-magnet switched-flux (PMSF) device has an outer rotor mounted to a shaft about a central axis extending axially through the PMSF device. First and second pluralities of permanent-magnets (PMs) are respectively mounted in first and second circles, radially outwardly in first and second transverse planes extending from first and second sections of the central axis adjacent to an inner surface of the outer rotor. An inner stator is coupled to the shaft and has i) a stator core having a core axis co-axial with the central axis; and ii) first and second pluralities of stator poles mounted in first and second circles, radially outwardly from the stator core axis in the first and second transverse planes. The first and second pluralities of PMs each include PMs of alternating polarity. | 01-27-2011 |
| 20110254401 | PERMANENT-MAGNET SWITCHED-FLUX MACHINE - A permanent-magnet switched-flux (PMSF) device has an outer rotor mounted to a shaft about a central axis extending axially through the PMSF device. First and second pluralities of permanent-magnets (PMs) are respectively mounted in first and second circles, radially outwardly in first and second transverse planes extending from first and second sections of the central axis adjacent to an inner surface of the outer rotor. An inner stator is coupled to the shaft and has i) a stator core having a core axis co-axial with the central axis; and ii) first and second pluralities of stator poles mounted in first and second circles, radially outwardly from the stator core axis in the first and second transverse planes. The first and second pluralities of PMs each include PMs of alternating polarity. | 10-20-2011 |
| 20120146448 | Modular Rotor For Synchronous Reluctance Machine - A rotor for a synchronous reluctance machine includes a plurality of rotor modules disposed in an axial sequence along a common axis. Each rotor module includes a plurality of poles disposed in adjacent sectors about the common axis, each pole including a plurality of magnetic segments spaced apart from one another in radial direction, a support plate, provided on an axial side of the plurality of poles, and fastening means for fastening the plurality of poles to the support plate. The fastening means, preferably a plurality of axially arranged bolts or an adhesive, bonds the plurality of poles to the support plate. | 06-14-2012 |
| 20140252913 | SINGLE PHASE SWITCHED RELUCTANCE MACHINE WITH AXIAL FLUX PATH - A reluctance machine includes a stator plate supporting stator poles circumferentially distributed about a first central opening and a rotor plate supporting stator poles circumferentially distributed about a second central opening. A rotation shaft is mounted to the rotor plate in the second central opening, the shaft passes through the first central opening to define an axis of rotation. The rotor and stator poles extend perpendicular from the rotor and stator plates, respectively, and support flux paths during single phase actuation which include a first flux portion passing through each stator pole parallel to the axis of rotation and a second portion passing through each rotor pole parallel to the axis of rotation. The flux paths cross an air gap between the stator and rotor poles from the first portion to the second portion. | 09-11-2014 |
| 20150042201 | SEGMENTED MOTOR/GENERATOR WITH TRANSVERSAL FLOW GUIDANCE, HIGH THRUST TORQUE AND SMALL MASS INERTIA - The present invention relates to a multiphase segmented high-power synchronous machine with transversal flux guidance consisting of at least two or more double segments. The two or more double segments form segments of a linear motor or generator or segments of a rotating motor or generator. The two or more double segments consist of a row of permanent magnets and soft-magnetic yokes with one or more circumferential windings. As a result of a bidirectional structure in each case winding currents of the same magnitude flow through two equally large segments. As a result of a phase-shifted arrangement of the yokes, the thrust torque is effected in the same direction of motion. The yokes can be arranged folded down or lying side by side. | 02-12-2015 |
| 310216076 | Having integral flux shunt | 1 |
| 20100019612 | FLUX IMPULSE MOTOR | 01-28-2010 |
| 310216079 | Removable pole | 4 |
| 310216086 | Dovetail connection | 4 |
| 20090195112 | STATOR FOR AN ELECTRIC MOTOR - A stator for an electric motor has a laminated stator core | 08-06-2009 |
| 20100019613 | STATOR FOR AN ELECTRIC MACHINE - A stator core for a stator of an electrical machine includes an elongate stator yoke having an interior surface that defines an axial central opening through the stator yoke. The interior surface further defines a plurality of axial channels about a perimeter of the central opening. A plurality of stator teeth are retained in the plurality of axial channels and spaced apart from one another to define to define axial channels to receive windings of the stator. | 01-28-2010 |
| 20120112600 | STATOR FOR ELECTRIC ROTATING MACHINE - A stator includes a stator core and a multi-phase stator coil distributedly wound on the stator core. The stator core includes a plurality of teeth and a yoke having a plurality of grooves. Each of the teeth has a press-fit portion, which is press-fitted in a corresponding one of the grooves of the yoke, and a main body portion extending from the press-fit portion in a direction away from the corresponding groove. The press-fit portion has a pair of contact surfaces which are both in contact with a bottom surface of the corresponding groove and away from each other in a width direction of the tooth. Further, (a+b)≦e/2, where a and b respectively represent widths of the contact surfaces of the press-fit portion, and e represents a width of the main body portion at a press-fit portion-side end of the main body portion. | 05-10-2012 |
| 20150326076 | ROTOR STRUCTURE FOR MOTOR - A rotor structure for a motor includes: a core body in which a shaft passes through an axial center and teeth are radially arranged along an outer circumference and include first slide connection portions at front ends; field windings individually wound around outer circumferences of the teeth and maintaining a state of being spaced apart from one another while being wound around the teeth; and a cylindrical core tip part configured to surround the outside of the core body, the cylindrical core tip part including second slide connection portions in an inner circumference such that the front ends of the teeth are slidably connected thereto along an axial direction through a mating engagement. | 11-12-2015 |
| 310216091 | Pole tip (e.g., shoe) | 48 |
| 20090195113 | INDUCTION MACHINE STATOR APPARATUS AND METHOD - A stator for an alternating-current induction machine, the stator comprising a cylindrical stator core. The stator may also comprise a first stator tooth. The first stator tooth may comprise a proximal end extending from the cylindrical stator core and a distal end comprising an outer surface positioned to face a rotor. A first arc of the outer surface may be eccentric relative to the cylindrical stator core. Various additional stator designs and methods are also disclosed. | 08-06-2009 |
| 20090195114 | MOTOR - A motor having a rotor and a stator that houses the rotor in a rotatable manner is herein provided. One of the rotor and the stator comprises at least one permanent magnet. The other of the rotor and the stator comprises at least one core that faces the at least one permanent magnet, and at least one coil that magnetizes the at least one core. The core comprises at least one extension plate that is formed on at least one end face of the core in an axial direction. The extension plate extends parallel to rotation axis of the rotor, and has a magnetic anisotropy whose axis of easy magnetization is substantially parallel to the rotation axis of the rotor. | 08-06-2009 |
| 20100237736 | PERMANENT MAGNET MACHINES - A permanent magnet machine includes a rotor and a stator including plurality of stator pole sections. Each stator pole section comprises a core section having an inner end piece disposed adjacent to the core section, the inner end piece comprising a first magnetic material that is adapted to saturate during exposure to a first magnetic field strength, and an outer end piece disposed adjacent to the core section radially outwardly relative to the inner end piece, the outer end piece comprising a second magnetic material that is adapted to be unsaturated during exposure to the first magnetic field strength and to saturate during exposure to a second magnetic field strength, wherein the second magnetic field strength is greater than the first magnetic field strength. | 09-23-2010 |
| 20120025664 | MAGNETIC CIRCUIT STRUCTURE - A magnetic circuit structure, such as a motor, is provided with: a rotor having rotor-side magnetic poles formed on the outer surface; and a stator having stator-side magnetic poles formed on the inner surface. The magnetic circuit structure has an air gap between the outer surface of a rotor-side magnetic pole and the inner surface of a stator-side magnetic pole in the location where the rotor-side magnetic pole and the stator-side magnetic pole face each other. At least one pair of a protrusion and a recess is created so that the outer surface of a rotor-side magnetic pole and the inner surface of a stator-side magnetic pole face each other through the air gap in the direction of the actual line of the rotation axis, and each pair of a protrusion and a recess has two or three steps in the direction of the radius around the rotation axis. | 02-02-2012 |
| 20140084741 | ROTATING ELECTRICAL MACHINE AND ELECTRIC POWER STEERING SYSTEM USING THE SAME - A permanent magnet rotating electrical machine includes: a stator including a stator core and a polyphase stator coil incorporated into the stator core; and a rotor including a rotor core and a plurality of permanent magnets which is fixed to the outer peripheral surface of the rotor core, wherein the stator core has a plurality of stator tooth portions forming a slot into which the stator coil is stored, the rotor core is rotatably disposed in opposed relation to the stator, and the stator tooth portion includes at the tip thereof at least one nonmagnetic inner region. | 03-27-2014 |
| 20140084742 | POLE SHOE OF A GENERATOR, PREFERABLY A GENERATOR OF A WIND TURBINE GENERATOR SYSTEM - The invention concerns a pole shoe, in particular of a generator, comprising a pole assembly which is of a laminated configuration, at least one winding arranged around the pole assembly, and a body which passes through the laminated pole assembly in the longitudinal direction and which has a plurality of transversely directed engagement locations, preferably at most three transversely directed engagement locations, into which a respective holding means can engage to fasten the pole shoe on a support, in particular the rotor or stator of a generator. The present invention further concerns a pole shoe, in particular of a generator, comprising a pole assembly which is of a laminated configuration, at least one winding arranged around the pole assembly, and an insulating means arranged between the pole assembly and the winding, wherein the insulating means has a fiber composite material. | 03-27-2014 |
| 20140346920 | Electric Machine - An electric machine, especially a transversal flux machine, the stator being composed of a stack of phase segments, each phase segment having at least one stator segment and one stator winding, especially a single winding, each stator segment having an annular stator bridge, on which pole shoes are premolded, which in particular extend in the radially inward direction, and/or which extend in the direction of the rotor and/or which are situated between the rotor and the annular stator bridge, the pole shoes having the same shape, in particular, the axial width of the pole shoe decreasing with increasing radial clearance, the associated profile being disposed between a first and a second profile, the first profile being a linear function of the radial clearance, the pole back associated with the first profile being a planar area, in particular, the second profile being a circular function, in particular a circular segment function, the pole back associated with the second profile being a cylindrical section area, in particular. | 11-27-2014 |
| 20160105088 | DC-EXCITED SYNCHRONOUS ELECTRIC MOTOR - In a DC-excited synchronous electric motor in which a field system is excited by using an exciting core, in order to obtain large torque density and output density, the effective area of air gaps, through which an armature and a field system face each other, is increased. The armature of a stator | 04-14-2016 |
| 310216092 | Defining non-uniform air gap | 31 |
| 20090243423 | ROTATING ELECTRIC MACHINE - In a rotating electric machine that is formed of a distribution winding motor with two slots per each pole and each phase, a stator core includes an air gap of a constant width dg | 10-01-2009 |
| 20110018384 | MOTOR - In a motor, a raised portion arranged to project toward a rotor magnet is provided on an opposed surface of each tooth portion. This raised portion provided on an opposed surface of each tooth portion. This raised portion is provided at a substantial middle of the opposed surface in a circumferential direction. This allows a waveform of a cogging torque generated by the raised portions and a fundamental of a waveform of a cogging torque generated by slot openings to be substantially in opposite phases. Cogging torque generated by the slot openings can be thereby reduced, because of the cogging torque generated by the raised portion. | 01-27-2011 |
| 20110043070 | ELECTRIC MACHINE AND ROTOR ARRANGEMENT - The invention relates to an electric machine, particularly for a synchronous machine excited by a permanent magnet. The electric machine comprises a rotor arrangement ( | 02-24-2011 |
| 20110169369 | STATOR FOR AN ELECTRIC MACHINE - An electric machine having a stator surrounding a rotor with an air gap therebetween. The stator has slots in its inner margin for accommodating stator coil windings. Stator teeth defined by the slots have irregular shapes to modify a variable flux flow pattern in the air gap to reduce harmonic torque components with minimal effect on an average value of rotor torque. | 07-14-2011 |
| 20110304238 | ROTATING MACHINE PROVIDED WITH STATOR CORE - A recording disk is to be mounted on a hub. A base rotatably supports the hub through a bearing. A stator core is fixed to the base and includes an annular portion and a salient pole extending radially therefrom. A magnet faces the salient pole radially and is rotated with the hub. The magnet has a plurality of magnetic poles in the circumferential direction such that each of the plurality of magnetic poles faces the salient pole. The salient pole includes a rod-shaped body around which a wire is wound and a tooth portion that is provided radially outside the rod-shaped body and extends circumferentially. The circumferential end located at the end in the circumferential direction of the tooth portion is located radially inside a circumscribed circle passing through the tip located at the radially outermost end of the tooth portion. | 12-15-2011 |
| 20120043849 | STATOR FOR ELECTRIC ROTATING MACHINE AND METHOD FOR MANUFACTURING THE SAME - The stator for the electric rotating machine includes a stator core that has slots, a stator coil, and an impregnant applied to the inner surface of the stator core. The stator core has a plurality of teeth that divide the slots. The teeth with chamfered surfaces and ones without chamfered surfaces are intermingled between a projected tip surface and each side surfaces of the teeth. At least one of bent corner parts formed at both ends of the projected tip surface of the teeth is formed in an arcuated surface. A relationship (R | 02-23-2012 |
| 20120139386 | ELECTRIC MOTOR - An electric motor according to the present invention includes a rotor core, a stator core provided so as to face the rotor core in the radial direction, and a permanent magnet buried in the vicinity of an outer circumferential part of the rotor core, wherein the outer circumferential part of the rotor core and an inner circumferential part of the stator core are formed in such a manner that a radial gap length between the outer circumferential part of the rotor core and the inner circumferential part of the stator core for one magnetic pole of the permanent magnet becomes a gap length along a gap length regulated by an expression capable of making magnetic flux density distribution between the outer circumferential part of the rotor core and the inner circumferential part of the stator core a sinusoidal waveform. | 06-07-2012 |
| 20120256514 | BRUSHLESS SYNCHRONOUS MOTOR - A brushless synchronous motor includes a rotor having a number n of embedded permanent magnets and being rotatable relative to a stator having a number of stator teeth provided with a three-phase stator winding, while forming an air gap. An angle between two adjacent permanent magnets is 360°/n where n>8, an angle between two adjacent stator teeth is 360°/n+2, and an inner contour of the stator facing the rotor has a curved structure with curvature valleys provided at ends of the stator teeth. | 10-11-2012 |
| 20130147309 | ROTOR GEOMETRY FOR REDUCTION OF TORQUE RIPPLE IN A WOUND FIELD MACHINE - An electric machine is provided with a rotor configured to be rotatable within a stator. A first and second tooth are disposed circumferentially along an outer perimeter of the rotor and at least partially define a first slot. The first and the second tooth define a respective first and second outer edge extending between a respective tooth base and a respective tooth tip. An arc radius from the origin to the outer perimeter of the rotor varies along the first outer edge of the first tooth, thereby creating a first non-uniform gap between the rotor and the stator. The arc radius from the origin to the outer perimeter of the rotor varies along the second outer edge of the second tooth, thereby creating a second non-uniform gap between the rotor and the stator. The rotor geometry is configured to reduce torque ripple without skewing either the rotor or the stator. | 06-13-2013 |
| 20130207508 | ROTARY ELECTRIC MACHINE - A rotary electric machine includes a rotor core in which first magnetic pole portions having permanent magnets and second magnetic pole portions having no permanent magnets are alternately arranged in a circumferential direction; and a stator core which is arranged to face an outer periphery of the rotor core. The rotor core is configured such that an average gap length between the stator core and the second magnetic pole portions is larger than an average gap length between the stator core and the first magnetic pole portions. | 08-15-2013 |
| 20130229085 | BRUSHLESS DC MOTOR - A brushless DC motor, comprising a stator having paired stator teeth, a rotor having paired magnetic poles and a rotating shaft fixed in the center of the rotor, wherein each of the stator teeth is wound with a winding, in each cross section of the stator, the connecting line between the intersection point of a tooth top arc of the stator tooth and the tooth axis of the stator tooth and the center of the tooth top arc can form a mechanical eccentric angle θ with the tooth axis of the stator tooth, which is more than 0 degree and smaller than 90 degrees. The tooth top circle of the stator tooth is designed to be an arc, which is eccentric relative to the rotating center of the rotor, such that the brushless DC motor can eliminate the starting “dead point” and start successfully. | 09-05-2013 |
| 20130270961 | INTERNAL PERMANENT MAGNET MOTOR - An internal permanent magnet motor includes a rotor having main polar surfaces and inter-polar surfaces that are each formed by connecting circular arcs of a plurality of eccentric circles that are not concentric with the rotor center. As such, a technique of adjusting air gap thickness is realized to achieve the purpose of reducing the cogging torque of the motor and regular layered variation of air gap thickness is employed to reduce higher harmonics occurring in the operation of the motor. Further, the present invention uses specific air gap thickness of the inter-polar surfaces and maintaining the inter-polar surfaces at a predetermined width to increase the quadrature axis inductance of the motor in order to increase the reluctance torque of the motor and improve torque of the motor. | 10-17-2013 |
| 20130300249 | SINGLE-PHASE BRUSHLESS MOTOR - A single-phase brushless motor has both superior start-up stability and low cogging torque. In the outer-rotor-type single-phase brushless motor, when a gap width between the rotor and one edge of the salient pole surface is defined as d | 11-14-2013 |
| 20130334925 | INTERIOR PERMANENT MAGNET TYPE ROTOR HAVING CONTINUOUS SKEW STRUCTURE - An IPM type rotor having a continuous skew structure obtained by a simple means, without constituting a permanent magnet as a complicated shape and forming an inclined magnetizing pattern on the permanent magnet. A rotor core has a recess formed on an outer circumferential surface of the rotor core. The recess is formed so as to extend along a boundary line of magnetic poles of a desired skew structure. Therefore, even when each permanent magnet has the cuboid shape, the magnetic flux may be uniformed during the magnetic flux is transmitted through the magnetic steel plate having high permeability, whereby the magnetic flux within the gap having low permeability becomes dominant. As a result, the rotor having the continuous skew structure is obtained. | 12-19-2013 |
| 20140028148 | METHODS, SYSTEMS, AND APPARATUS FOR REDUCING COGGING TORQUE IN AN ELECTRIC MACHINE - An interior permanent magnet machine is described. The machine includes a rotor rotatable about a central machine axis. The rotor includes a plurality of permanent magnet openings and a plurality of permanent magnets disposed therein. The permanent magnet openings are separated by rotor webs configured to facilitate reducing leakage flux through the rotor webs. The machine also includes a stator disposed coaxially with the rotor and separated from the rotor by a circumferential air gap. The stator includes a plurality of stator teeth that define a plurality of stator slots therebetween. The stator teeth include a stator tooth tip configured to facilitate reducing cogging torque and torque ripple. | 01-30-2014 |
| 20140117807 | Rotor and motor and/or electric vehicle driving apparatus including the same - A motor includes a plurality of tooth bodies extending from a rotor core. A pole shoe extends from an end of at least one tooth body at opposite sides where both sides of the pole shoe have a curved outer part opposite to each other and asymmetric to each other in that a radius of curvature of the curved outer part of the one side of the pole shoe that is in a rotational direction of the rotor has a smaller radius than a radius of curvature of the other side of the pole shoe that is not in the rotational direction of the rotor. | 05-01-2014 |
| 20140368081 | ROTOR OF PERMANENT-MAGNET EMBEDDED MOTOR, AND COMPRESSOR, BLOWER, AND REFRIGERATING/AIR CONDITIONING DEVICE USING THE ROTOR - A rotor of a permanent-magnet embedded motor includes a rotor core having magnet insertion holes along a circumferential direction and a magnet inserted into each of the holes, wherein a gap is formed at opposite ends of a hole at a time of inserting the magnet therein, an outer peripheral face of the core is formed by a first curved surface formed from a magnetic pole center to between poles, with a radial distance from a shaft center of the core being largest at the pole center on the peripheral face, and a second curved surface formed from an interpolar portion toward the pole center to intersect with the first curved surface, with the radial distance from the shaft center being smallest in the interpolar portion on the peripheral face, and wherein a length of the first curved surface is larger than a length of the second curved surface. | 12-18-2014 |
| 20160111924 | EMBEDDED MAGNET MOTOR AND ROTOR OF EMBEDDED MAGNET MOTOR - An embedded magnet motor includes a stator core, a plurality of permanent magnets each having a rectangular cross section, and a rotor core. The stator core and the rotor core define a first air gap being positioned at an intermediate portion of the rotor core, a second air gap being positioned at a first portion corresponding to a first axis of the rotor core, and a third air gap being positioned at a second portion corresponding to a second axis of the rotor core. Because a diameter of the intermediate portion being positioned between the first portion and the second portion of the rotor core is set smaller than a diameter of the first portion and than a diameter of the second portion, the first air gap is set greater than the second air gap and than the third air gap. | 04-21-2016 |
| 20160197524 | MOTOR HAVING REDUCED COGGING TORQUE | 07-07-2016 |
| 310216093 | Tapered tip | 3 |
| 20110193445 | Inner-Roter-Type Motor and Claw-Pole Member Thereof - An inner-rotor-type motor comprises a casing, a shaft and a claw-pole member. The shaft is rotatably coupled to the casing, and coupled to a permanent magnet having a magnetism-inducing surface. The claw-pole member is coupled within the casing and has an annual portion and a plurality of salient-poles. The annual portion has an inner circumferential wall. Each salient-pole is disposed between the annual portion and a respective pole plate. Each pole plate has a first side and a second side. The first side and the second side are opposing to each other. A magnetic pole surface is formed between the first side and the second side and faces the magnetism-inducing surface of the permanent magnet. An air gap is formed between the magnetic pole surface and the magnetism-inducing surface. Each pole plate has an extension portion and a shrinking portion. The coil unit is coupled to the plurality of salient-poles. | 08-11-2011 |
| 20150091410 | AXIAL FLUX ELECTRICAL MACHINES AND METHODS OF MANUFACTURING THE SAME. - An axial flux electric machine comprises a rotor assembly configured to rotate about an axis of rotation. A stator core is coupled to the rotor assembly. The stator core comprises a stator core base and a plurality of circumferentially-spaced stator teeth extending from the base in a direction parallel to the axis. Each stator tooth of the plurality of stator teeth comprises a top surface, a pair of opposing circumferential sides, and a chamfered portion defined at an intersection of the top surface and each of the pair of opposing sides. The chamfered portion facilitates reducing an amount of torque ripple produced by the axial flux electric motor. | 04-02-2015 |
| 20160164349 | OUTER-ROTOR PERMANENT MAGNET BRUSHLESS MOTOR - An outer-rotor permanent magnet brushless motor is disclosed, which comprises an outer-rotor and an inner-stator. The outer-rotor configured with P poles, P is a natural number and denotes a multiple of 4. The inner-stator has a stator axle, and S teeth which configured on outer surface of stator, S=P−1, S is a natural number. A circle is formed about a center of the stator axle from the center of the outer end surface. A correction angle a1 and an original angle a are defined from the center of the outer end surface. T The ratio of a1/a is defined by the following formula: | 06-09-2016 |
| 310216094 | Via tip slot | 9 |
| 20100181864 | ROTATING ELECTRIC MACHINE - A rotating electric machine includes a stator having a plurality of winding phases formed by distributed winding, a rotor having a plurality of magnetic poles and an outer circumference facing the stator, a first groove formed in the outer circumference of the rotor, a second groove formed in a position opposite to reference magnetic poles closest to the first groove, of the magnetic poles, with respect to the first groove, and a protrusion positioned between the first groove and the second groove and defined by the first and second grooves, and a ratio of a width half the width of the protrusion in a circumferential direction of the rotor to a width of the first groove and the second groove in the circumferential direction of the rotor is not smaller than 0.37 and not greater than 6. | 07-22-2010 |
| 20110254402 | BRUSHLESS DC MOTOR - A brushless DC motor provided with nine slots and eight poles includes a stator including a stator core having pole teeth on the outer circumference thereof and a coil wound around each pole tooth; a rotor disposed at an outside position of the outer circumference of the stator via a gap and having a multiply magnetized permanent magnet with plural magnetic poles; a pole tooth surface formed at a portion of the pole tooth and facing an inner circumference of the rotor; a recessed portion formed on the pole tooth surface; and a slot formed between the adjacent pole teeth and extending a first angular range around a rotational center of the rotor; in which the recessed portion extends in a second angular range around the rotational center of the rotor, the second angular range is 1.2 to 3.0 times the first angular range, the recessed portion has a radial depth which is 0.5% or more of an inner diameter of the permanent magnet, the pole tooth extends in a third angular range around a rotational center of the rotor, and the third angular range is 0.58 to 0.8 times a value which is obtained by dividing 360 degrees by the number of magnetic poles of the permanent magnet. | 10-20-2011 |
| 20120025665 | SINGLE-PHASE BRUSHLESS MOTOR - A single-phase brushless motor, includes: a rotor including plural magnetic poles; a stator disposed facing the rotor via a gap and including the same number of salient poles as that of the magnetic poles; a driving coil wound around the plural salient poles; a salient pole surface having a bevel-shape and provided on each salient pole, the salient pole surface facing the rotor a groove provided at a position between a center and an end in a circumferential direction of each salient pole surface; in which a wave shape of each surface magnetic flux of the plural magnetic poles has a distribution of the surface magnetic flux density composed of sloping portions disposed at both sides of the wave shape and a plane portion disposed between the sloping portions. | 02-02-2012 |
| 20120133239 | MAGNET EMBEDDED ROTOR, ELECTRIC MOTOR, AND ASSEMBLY METHOD OF ELECTRIC MOTOR - According to one embodiment, a magnet embedded rotor includes a rotor iron core and a permanent magnet. The rotor iron core is formed of a magnet into a cylindrical shape and provided with holes. The rotor iron core includes a nonmagnetic portion, salient poles, a notch groove, a bridge, and a first protrusion. The nonmagnetic portion prevents magnetic-flux short circuiting. The salient poles are located on the outer circumferential side of the holes. The notch groove is located between an adjacent pair of the salient poles. The bridge is located between the notch groove and the nonmagnetic portion. The first protrusion protrudes outward from the center of the notch groove. The permanent magnet is embedded in each hole. The radius of each salient pole gradually decreases from the center toward the notch groove. The radius of the first protrusion is equal to that of the center of the salient pole. | 05-31-2012 |
| 20130093284 | ROTOR OF ELECTRIC ROTATING MACHINE - The waveform of a magnetomotive force generated by a rotor is comprised of a plurality of sections that respectively correspond to a plurality of magnetic poles of the rotor. When viewed along the axial direction of a rotor core, each of the sections of the waveform includes two oblique lines and a connection line. Each of the oblique lines extends from a 0 reference line, which is defined by an outer peripheral surface of the rotor core, obliquely with respect to a radial direction of the rotor core. The connection line connects the two oblique lines in the circumferential direction of the rotor core. Moreover, representing the circumferential width of the connection line by 2π·Duty, the circumferential width of the oblique lines by 2π·Slope, the radial height of the oblique lines by B, the order of a harmonic component of the magnetomotive force by n, and the amplitude of the nth harmonic component by Amp | 04-18-2013 |
| 20130113333 | MULTI-GAP TYPE ELECTRIC ROTATING MACHINE - In a multi-gap type electric rotating machine, side cores include an outside-side core connected to one end side of an outside core, and an inside-side core connected to one end side of an inside core. The outside-side core includes an outer-side rotor-opposite portion which projects from the inner periphery end of the outside core and is opposite to an end face at the outer periphery side of a rotor. The inside-side core includes an inner-side rotor-opposite portion which projects from the outer periphery end of the inside core and is opposite to an end face at the inner periphery side of the rotor. The outside-side core and the inside-side core are arranged so as to be opposed to each other in the radial direction thereof with a gap being interposed between the inner periphery end of the outer-side rotor-opposite portion and the outer periphery end of the inner-side rotor-opposite portion. | 05-09-2013 |
| 20130154436 | PERMANENT MAGNET TYPE ROTARY ELECTRIC MACHINE AND ELECTRIC POWER STEERING APPARATUS USING THE SAME - Not less than two regions different in magnetic circuit design are provided in a rotational axis direction of the rotor ( | 06-20-2013 |
| 20140062254 | Permanent Magnet Rotating Electrical Machine - A permanent magnet rotating electrical machine is configured to include a stator that includes a stator core and a winding wound around a teeth portion of the stator core, a rotor rotatably arranged with respect to the stator with a gap, and in which a rotor core and a plurality of permanent magnets having different poles are alternately arranged in a circumferential direction, and a groove provided in a surface of the rotor core, the surface facing the stator, in a manner symmetric about a center line of the permanent magnet in the circumferential direction. | 03-06-2014 |
| 20150295455 | Rotating Electric Machine and Electrically Driven Vehicle - Provided is a rotating electric machine including a rotor and stator fitted with various numbers of poles and slots and adapted to reduce vibration/noise of the machine. The rotating electric machine in accordance with an aspect of the present invention includes a stator having an S number of teeth, and a rotor disposed in the stator with a gap intervening between the stator and the rotor. The plurality of teeth in the stator are grouped in units of the number of teeth that is equal to a value “m” or a value “d”, the value “m” being obtained by dividing the number of stator slots, S, by the greatest common divisor N of the number of poles, P, and the number of stator slots, S, the value “d” being an aliquot of “m”. At least one tooth in each of the tooth groups has a distal end different in shape from distal ends of other teeth belonging to the same tooth group, and the plurality of tooth groups have the same configuration. | 10-15-2015 |
| 310216096 | Asymmetrically shaped | 3 |
| 20100225196 | ELECTRIC MACHINE - An electric machine that includes a permanent-magnet rotor and a stator. The stator includes a plurality of poles, each pole having a leading edge and a trailing edge relative to the direction of rotation of the rotor. The leading edge of each pole is thicker than the trailing edge in a direction normal to the rotational axis of the rotor. | 09-09-2010 |
| 20110031843 | Permanent Magnet Machine with Different Pole Arc Angles - 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. Asymmetry is achieved by placing adjacent permanent magnets or magnet sets on the rotor periphery with different rotor magnetic pole arc angles. | 02-10-2011 |
| 20150054379 | ELECTRIC MOTOR - An electric motor may have a rotor and a stator. An external part and an internal part may be arranged concentrically to a rotation axis and may be adjustable rotationally relative to each other about the rotation axis. The electric motor may be one of an external rotor motor and an internal rotor motor. The external part may have at least two permanent magnets. The internal part may have at least two pole arms and at least one electric coil. The rotor may be formed symmetrically and the stator may be formed asymmetrically. | 02-26-2015 |
| 310216097 | Having a particular dimension | 2 |
| 20110121679 | MOTOR - A motor may include a stator provided with a yoke having a plurality of pole teeth and an exciting coil and a rotor disposed in a circular space surrounded by the pole teeth. A portion where a difference between an inner side area of the pole tooth facing the rotor and an outer side area of the pole tooth facing the exciting coil is larger than a difference between the inner side area and the outer side area of the pole tooth where both circumferential direction faces of the pole tooth are formed in faces coincided with normal lines may be provided on a root part of the pole tooth. Further, circumferential direction faces of at least a root part of the pole tooth are formed so as to face the rotor in an inclined manner. | 05-26-2011 |
| 20130076195 | MOTOR AND ELECTRICAL APPARATUS HOUSING SAME - A motor of this invention comprises a rotor having a permanent magnet, the number of which magnet poles is P, and a stator including M pcs of teeth, the teeth arranged in a circumferential direction in a manner to face the permanent magnet through a spatial gap, wherein the stator includes stator core having the number M of the teeth, and a winding wire wound about each of the tooth, wherein the number P of the magnet poles and the number M of the teeth have a relation defined by formulae (2/3)M| 03-28-2013 | |
| 310216098 | Removable tip | 1 |
| 20110101818 | SEGMENTED STATOR ASSEMBLY - An electric machine and stator assembly are provided that include a continuous stator portion having stator teeth, and a tooth tip portion including tooth tips corresponding to the stator teeth of the continuous stator portion, respectively. The tooth tip portion is mounted onto the continuous stator portion. | 05-05-2011 |
| 310216099 | Magnetic inter-pole bridging structure | 1 |
| 20140167557 | MOTOR - Provided is a motor. The motor includes a stator that includes a stator core and a coil that is wound around the stator core, and a rotor that is rotatably disposed in the stator, wherein the stator core includes a plurality of teeth that are radially formed along an inner circumferential surface of the stator core, a plurality of shoes that extend in a circumferential direction from both sides of an end of each of the plurality of teeth, and a tip portion that extends in the circumferential direction from an end of each of the plurality of shoes to contact a tip portion of an adjacent tooth. | 06-19-2014 |
| 310216104 | With nonmagnetic inter-pole tip support | 2 |
| 20140070659 | STATOR ASSEMBLY FOR MOTOR - Disclosed herein is a stator assembly for a motor including: a core member provided with a ring shaped yoke part and a plurality of coil winding parts spaced apart from each other at equidistance in a circumferential direction to be extended from the yoke part; and a tip member alternately provided with at least one mounting part having hollow parts and made of a magnetic material and at least one connecting part disposed between the mounting parts, wherein each of the end portions of the coil winding parts is fixedly positioned at each of the hollow parts. | 03-13-2014 |
| 310216105 | Insulated | 1 |
| 20150028718 | SYSTEM AND METHOD FOR SMOOTHING A SALIENT ROTOR IN ELECTRICAL MACHINES - An electrical machine exhibiting reduced friction and windage losses is disclosed. The electrical machine includes a stator and a rotor assembly configured to rotate relative to the stator, wherein the rotor assembly comprises a rotor core including a plurality of salient rotor poles that are spaced apart from one another around an inner hub such that an interpolar gap is formed between each adjacent pair of salient rotor poles, with an opening being defined by the rotor core in each interpolar gap. Electrically non-conductive and non-magnetic inserts are positioned in the gaps formed between the salient rotor poles, with each of the inserts including a mating feature formed an axially inner edge thereof that is configured to mate with a respective opening being defined by the rotor core, so as to secure the insert to the rotor core against centrifugal force experienced during rotation of the rotor assembly. | 01-29-2015 |
