| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 310156280 | Sleeve covering magnet face | 36 |
| 20080203843 | Rotor with Clamping Device - Manufacturing costs of releasable permanent magnet rotors or asynchronous squirrel cages should be reduced. Accordingly, a rotor is proposed which includes at least one ring-shaped fastening device ( | 08-28-2008 |
| 20080238234 | Segmented permanent magnet rotor for high speed synchronous machines - The segmented permanent-magnet rotor for high-speed synchronous machines reduces eddy-current losses by axially segmenting the containment sleeve and the permanent magnets. The axial segmentation of the containment sleeve includes forming grooves circumferentially around the outer surface of the containment sleeve. The circumferential grooves disrupt the generation of eddy currents on the outer surface of the containment sleeve and therefore reduce eddy-current losses in the containment sleeve. Axial segmentation of the permanent magnets also disrupts eddy current formation, thereby reducing eddy current losses in the permanent magnets. In addition, the presence of an electrically insulating layer between the containment sleeve and the permanent magnets reduces eddy current migration from the containment sleeve to the permanent magnets, and therefore provides additional reduction of eddy-current losses. | 10-02-2008 |
| 20090102304 | ROTOR OF ROTATING ELECTRICAL MACHINE AND MANUFACTURING METHOD THERE FOR - A rotor of a rotating electrical machine is provided in which neither deterioration nor fluctuation in the cogging torque is caused and that causes neither physical enlargement nor cost increase. The rotor of a rotating electrical machine, provided with a plurality of magnetic poles | 04-23-2009 |
| 20090146517 | Rotor for an electric synchronous machine - The present invention relates to a rotor for an electric synchronous machine, which has at its outside at least one magnetic material area | 06-11-2009 |
| 20090160282 | Permanent-Magnet Generator Rotor for Gas Turbine, Manufacturing Method Therefor, and Gas Turbine - A permanent-magnet generator rotor comprising a first rotor shaft end portion having in the axial center a hollow portion through which a bolt is passed; a second shaft end portion having in the axial center a hollow portion and a bearing portion through which the bolt is passed. A magnetic cylindrical body is sandwiched between the first and second shaft end portions. The permanent-magnet generator rotor includes the magnetic cylindrical body fixed between the first and second shaft ends, a permanent magnet held on the outer circumferential surface of the magnetic cylindrical body; a non-magnetic cylindrical body shrink-fit onto the outer circumferential surface of the permanent magnet; a stator disposed around the permanent magnet; and the bolt penetrating through the first and second shaft ends; the hollow portions in the generator, and the magnetic cylindrical body. | 06-25-2009 |
| 20090195102 | MOTOR ROTOR - A motor rotor ( | 08-06-2009 |
| 20090267438 | MOTOR ROTOR AND ELECTRIC POWER STEERING APPARATUS - A motor rotor has a rotor yoke having a polygonal column structure, a plurality of magnet fixing sections formed on the lateral surface of the rotor yoke, segment magnets respectively fixed to the magnet fixing sections and extending in the axial direction of the rotor yoke, and projections provided on the rotor yoke and protruding outward from the rotor yoke, the projections being provided at each boundary section located between each of the adjacent magnet fixing sections and being provided in pairs in the axial direction of the rotor yoke. | 10-29-2009 |
| 20100019601 | WRAPPED ROTOR SLEEVE FOR AN ELECTRIC MACHINE - A rotor for an electric machine may include a rotor hub, a plurality of permanent magnets disposed about the rotor hub, a first sleeve circumjacent the plurality of permanent magnets, and a second sleeve. The second sleeve may be formed from a metal tape wrapped over the first sleeve. The second sleeve may be bonded to first and second end rings disposed at adjacent ends of the rotor hub. The metal tape may be applied in tension and may wrapped to form butt laps over the first sleeve. The metal tape may be corrosion resistant. Further, the second sleeve formed from the metal tape may protect the rotor from erosion and abrasion from fluid passing over the rotor. | 01-28-2010 |
| 20100019602 | ROTOR FOR ELECTRIC MACHINE HAVING A SLEEVE WITH SEGMENTED LAYERS - A rotor for an electrical machine includes an elongate rotor core assembly comprising a rotor core and a plurality of permanent magnets arranged in a plurality of rings around the rotor core. A composite sleeve resides around the rotor core assembly. The sleeve includes a primarily axially-oriented outer layer and an intermediate layer beneath the outer layer. The intermediate layer includes a circumferential band of composite material positioned orthogonal to a longitudinal axis of the rotor core assembly. | 01-28-2010 |
| 20100117473 | ROBUST PERMANENT MAGNET ROTOR ASSEMBLY - A rotor assembly for an electric motor having at least one gas vent allowing for the release of gases from within an enclosed portion is provided. The rotor assembly comprises a rotor shaft with at least one magnet longitudinally extending a portion of an outer surface thereof in an axial direction and being retained therewith. A non-magnetic wedge spacer may be positioned between each of a plurality of magnets and a cylindrical sleeve may be positioned about the at least one magnet. An end cap or stub shaft is adhered or mechanically held to or within each end of the cylindrical sleeve adjacent the at least one magnet forming an enclosed portion of the rotor assembly. At least one vent hole, channel, or bevel provides a gas flow through passage in flow communication with the enclosed portion and an environment outside of the enclosed portion of the rotor assembly. | 05-13-2010 |
| 20100171383 | ROTOR FOR ELECTRIC MACHINE HAVING A SLEEVE WITH SEGMENTED LAYERS - An electric machine system includes an electric machine and a companion device. The electric machine has a stationary member and a movable member that, by interaction of magnetic fields, at least one of moves relative to the stationary member or generates electricity when moved relative to the stationary member. One of the stationary member and the movable member includes a permanent magnet. The companion device is coupled to the electric machine to communicate mechanical movement with the movable member. In certain instances, the electric machine system has adaptations for operation of the electric machine system subsea and/or in a corrosive environment. | 07-08-2010 |
| 20100295402 | MOTOR ROTOR AND MANUFACTURING METHOD THEREOF - A motor rotor is provided wherein a resin with which a thread layer is impregnated is preventing from being broken even if the motor rotor is rotated at a high speed. A thread layer | 11-25-2010 |
| 20100301696 | ROTOR STRUCTURE FOR A PERMANENT MAGNET ELECTRICAL MACHINE - A rotor structure of a permanent magnet electrical machine and a method for manufacture of the rotor structure. The rotor structure has a shaft. An outer surface of the shaft is provided with a permanent magnet. A support collar encircles the permanent magnet. A protective piece is located between the outer surface of the shaft and an inner surface of the support collar and is arranged as an axial mechanical extension for the permanent magnet. The protective piece reduces local maximum values of forces forming between the support collar and the permanent magnet during rotation of the rotor. | 12-02-2010 |
| 20110025159 | ROTOR ASSEMBLY INCLUDING SINTERED MAGNET CORE ASSEMBLY - A rotor assembly for an electric motor includes a drive assembly, a cup that receives a portion of the drive assembly, and a magnet core assembly received between the drive assembly and the cup. The magnet core assembly is hermetically sealed between the drive assembly and the cup. | 02-03-2011 |
| 20110156521 | Permanent Magnet Type Rotating Electric Machine - A permanent magnet type rotating electric machine is comprised of a rotor and a stator opposed to each other keeping a predetermined clearance therebetween. The rotor having a rotor core formed by silicon steel plates being laminated in an axial direction of the rotor core, slots being formed near an outer periphery of the rotor core in the rotor core so as to be open at the outer periphery of the rotor core, permanent magnets being inserted into the slots respectively, and a non-magnetic sleeve covering the outer periphery of the rotor core. Each of the slots has inclined side faces outwardly broadening the slot in a radial direction of the rotor core. Each of the permanent magnets is fixed into the slot with a force applied from the sleeve so as to directing toward a center of the rotor core and an pressure applied from the inclined side faces of the slot. | 06-30-2011 |
| 20110187219 | ROTOR STRUCTURE OF PERMANENT MAGNET TYPE ROTARY MACHINE - In a rotor structure of a permanent magnet type rotary machine comprising a cylindrical permanent magnet | 08-04-2011 |
| 20120001510 | PERMANENT MAGNET ROTOR - The permanent magnet rotor is capable of making tolerance of attaching a magnet cover great, applying no stress to structural elements of the rotor, preventing the magnet cover from being damaged under an environment where thermal expansion and thermal contraction are repeated in response to temperature variation, and preventing scatter of magnets. The permanent magnet rotor of an inner rotor-type motor comprises: a rotor yoke; a plurality of permanent magnets being arranged on an outer circumferential face of the rotor yoke, the permanent magnets constituting a plurality of segments; and a ring-shaped magnet cover covering outer faces of the permanent magnets, the magnet cover being composed of a nonmagnetic material. An inner diameter of the magnet cover before covering the outer faces of the permanent magnets is smaller than an outer diameter of the circularly-arranged permanent magnets. At least one stretchable section, which is capable of being stretched in the circumferential direction, is formed in the magnet cover. | 01-05-2012 |
| 20120074807 | Retaining Sleeve for Over Molding Magnets - A retaining sleeve for retaining magnets inserted therein so that the magnets may be overmolded with a polymer pursuant to the manufacture of a rotor for an electric motor. The retaining sleeve comprising a generally cylindrical portion having an inner peripheral surface concentric about a central axis and a plurality of retaining partitions extending inward from the inner peripheral surface of the generally cylindrical portion, wherein the retaining partitions are configured to at least substantially limit movement of the magnets toward the central axis upon the magnets being inserted in the retaining sleeve at their respective locations inward of the inner peripheral surface of the retaining sleeve and between retaining partitions. | 03-29-2012 |
| 20120187792 | MOTOR - A motor includes: a rotor comprising: a rotary shaft; a magnetic body rotatable together with the rotary shaft; and first and second permanent magnets fixed on an outer circumference or an inner circumference of the magnetic body, and a stator comprising: an iron core arranged around the rotor; and a coil for exciting the iron core. | 07-26-2012 |
| 20120187793 | ROTOR - The invention relates to a rotor ( | 07-26-2012 |
| 20120293032 | PERMANENT MAGNET ARRANGEMENT FOR AN ELECTRICAL MACHINE - A permanent magnet arrangement for an electrical machine comprises a support structure for carrying magnetic flux and a pole assembly fixed to the support structure. The pole assembly comprises a magnet pole comprising at least one piece of permanent magnet material and a magnet carrier on which the magnet pole is mounted and which provides a magnetic flux path between the magnet pole and the support structure. The permanent magnet arrangement further comprises a sleeve containing the magnet pole and at least part of the magnet carrier. The magnet carrier is secured to the support structure to fix the pole assembly to the support structure and the sleeve is clamped to the support structure by the magnet carrier. A method for assembling the permanent magnet arrangement is also described. | 11-22-2012 |
| 20130043756 | RETAINING BANDS - The present invention relates to a retaining band which provides outer reinforcement for the rotor assembly of a high speed electrical machine. The rotor assembly includes a plurality of circumferentially-spaced permanent magnet assemblies. A retaining band is fitted around the rotor assembly and applies a pre-load to the permanent magnet assemblies in the radial direction. The retaining band has a plurality of voids that are sized and shaped to provide the retaining band with a progressive spring stiffness in the radial direction. The voids are open before the retaining band is fitted and during the fitting process the retaining band is deflected in the radial direction so that the voids close up and the retaining band becomes substantially solid. | 02-21-2013 |
| 20130049511 | PERMANENT MAGNET EMBEDDED ROTOR - A permanent magnet embedded rotor disposed coaxially with a cylindrical stator having a plurality of coils in the circumferential direction includes a rotor core that includes a columnar body made of a magnetic metal and a spacer made of a nonmagnetic material, and has an even number of insertion grooves, a cylindrical body that is made of a nonmagnetic metal with good electrical conductivity and externally inserted on the rotor core, permanent magnets embedded in the insertion grooves so that their N poles and S poles alternately come into contact with the inner peripheral surface of the cylindrical body, and a rotary shaft made of stainless steel fit into a rotation center of the rotor core. | 02-28-2013 |
| 20130062984 | Permanent Magnet Electrical Machine Rotors and Construction Methods Therefor - Permanent magnet electrical machine rotors and construction methods therefor are disclosed. Permanent magnet electrical machine rotors may include at least one magnet and at least one retention element. The at least one magnet may have a surface. An axial relative force maintained between the at least one magnet and the at least one retention element may urge the retention element along the surface to induce a hoop stress in the at least one retention element and a compressive stress within the at least one magnet. | 03-14-2013 |
| 20130342066 | ROTOR, DYNAMO-ELECTRIC MACHINE HAVING THE ROTOR AND ROTOR MANUFACTURING METHOD - A cover is configured into a tubular form and is fitted to a radially outer surface of each of projections of a rotor core and a radially outer surface of each of permanent magnets. A circumferential center portion of the radially outer surface of each projection contacts a radially inner surface of the cover. Circumferential end portions of the radially outer surface of each projection are radially inwardly spaced from the radially inner surface of the cover. | 12-26-2013 |
| 20140062245 | ROTOR FOR ROTATING ELECTRIC MACHINE - A rotor includes a rotation shaft having a rotation axis; a rotator core fixed to the rotation shaft and having an axial end face and an outer circumference face; an end plate covering the axial end face of the rotator core; and a magnet cover covering the outer circumference face of the rotator core. The magnet cover has a first end portion adjacent to the end plate and a second end portion which is opposite to the first end portion in an axial direction. The first end portion of the magnet cover covers entire outer periphery edge of the end plate. The first end portion of the magnet cover is bent toward the rotation axis in entire outer periphery edge of the magnet cover. | 03-06-2014 |
| 20140084733 | METHOD OF MANUFACTURING A ROTOR FOR ELECTRIC MOTORS AND ASSOCIATED ROTOR - A method of manufacturing an electric-motor rotor may include providing a magnet of sintered magnetic material, the magnet having a first diameter; providing a sheath of composite material, the sheath having an inner diameter smaller than the first diameter; reducing the first diameter to a second diameter; fitting the sheath onto the magnet when the magnet has the second diameter; and letting the magnet with the sheath fitted thereon to interfere, allowing the sheath to exert inward pressure on the magnet. An electric-motor rotor may include a magnet of sintered magnetic material, the magnet having a first diameter; and a sheath of composite material, the sheath having an inner diameter smaller than the first diameter. The sheath may be associated with the magnet in such a way that the magnet with the sheath fitted thereon interfere so that the sheath exerts inward pressure on the magnet. | 03-27-2014 |
| 20140111052 | BRUSHLESS DC MOTOR WITH PERMANENT MAGNET ROTOR - The brushless DC motor of the present invention comprises a permanent magnet rotor rotating coaxially with and inside of the stator containing the electric windings, separated by a radial, axially extending gap. The rotor can be formed of four or more permanent, e.g., ferrite ceramic magnets, spaced substantially equidistantly circumferentially around the rotor and extending radially along the axial length of the rotor. The preferred ferrite magnets are substantially corrosion resistant, and thus durable in the wet rotor environment, in which it may be used, sufficient to withstand the effects of even hot salt water. Preferably, four of the permanent magnets are bar magnets, i.e., rectangular in cross-section, extending radially and perpendicularly to the adjacent magnets. Most preferably, the bar magnets are separated by generally wedge-shaped, or quadrant-shaped, sections of magnetic material. The permanent magnets are polarized so that the north-south flux lines extend transversely to each adjacent magnet, most preferably forming a so-called Halbach Array. This brushless DC motor is especially useful for driving wet rotor pumps, wherein the particular combination of elements forming the rotor results in a highly efficient, effective and durable motor. | 04-24-2014 |
| 20140152138 | ROTOR AND ROTATING ELECTRIC MACHINE HAVING THE SAME - A rotor for a rotating electric machine includes a core body having a through-hole, a magnet, a tubular portion, and a plate part having an opening. The through-hole passes through the core body in a thickness direction. The magnet is disposed on an outer wall of the core body. The tubular portion is placed radially-outward of the core body. The plate part seals at least one end of the tubular portion in an axial direction. The opening is provided at a position corresponding to the through-hole and passes through the plate part in a thickness direction. The through-hole is one of a plurality of the through-holes, and the magnet is one of a plurality of the magnets. | 06-05-2014 |
| 20150145369 | METHOD OF COMPOSING A SLEEVE ASSEMBLY FOR CONTAINMENT PURPOSES IN HIGH CENTRIFUGAL APPLICATIONS - This invention relates to a method for composing a sleeve assembly suitable for use in containment purposes in high-speed machine that are subjected to high operational temperatures. The method has the steps of providing a composite sleeve and winding at least two layers of woven fabric on top of the composite sleeve and each other, where the woven fabric is impregnated with a thermoset resin. The method additionally has the step of optionally winding a perforated layer on top of an outermost layer of the layers of woven fabric to remove excess resin when the woven fabric is wound over the composite sleeve. The method also includes the steps of wrapping an absorption layer over the composite sleeve for absorbing the excess resin, curing the thermoset resin, and removing the absorption layer and the perforated layer after the curing. | 05-28-2015 |
| 20150145370 | ROTATOR OF ROTATIONAL ELECTRIC MACHINE - A rotor core has a regular decagon base portion in its cross section relative to a shaft center and ten convex portions each of which is located between each angle of the regular decagon base portion. Each convex portion has a first convex curve having a single curvature radius. Each permanent magnet is a curved plate and has a concave curve and a second convex curve. Each permanent magnet is provided so that the concave curve adheres on the first convex curve. When each permanent magnet moves in circumferential direction relative to the rotor core, the concave curve slides on the first convex curve of the rotor core. A position of the smallest gap clearance between the second convex curve and the stator does not change. A magnetic-flux-strength maximum position is not changed easily. | 05-28-2015 |
| 20150326081 | ROTOR OF AN ELECTRIC MOTOR, WITH AN OUTER SLEEVE FORMED BY WINDING, METHOD FOR PRODUCING SUCH A ROTOR, AND ELECTRIC MOTOR COMPRISING SUCH A ROTOR - An electric motor rotor including a magnetic core, magnets fastened to the periphery of the magnetic core, and a wire wound with touching turns around the magnetic core and the magnets. The wire includes a metal core surrounded by an electrically insulating layer, itself covered by an outer sheath of thermo-adhesive material, the turns being fastened to one another by adhesion between mutually contacting portions of the outer sheath. A method of fabricating such a rotor. An electric motor including such a rotor. | 11-12-2015 |
| 20150333584 | HIGH SPEED BRUSHLESS DC ELECTRIC MACHINE - Certain aspects encompass a brushless DC electric machine that has a DC stator having field windings. The DC electric machine additionally has a DC rotor. The DC rotor has a rotor core and a plurality of permanent magnets arranged around the rotor core. The permanent magnets are shaped and have a gap between each adjacent permanent magnet to produce a trapezoidal back EMF in the field windings. A non-magnetic material resides in the gaps and bridges each adjacent permanent magnet. A non-magnetic sleeve is provided around the permanent magnets and the non-magnetic filler material retaining the permanent magnets to the core. | 11-19-2015 |
| 20150364960 | ROTOR MEMBER FIXED TO ROTARY SHAFT OF ELECTRICAL ROTATING MACHINE, ROTOR, ROTARY ELECTRIC MACHINE AND METHOD FOR DISASSEMBLING ROTOR - Provided is a rotor member that can contribute to an easy assembling operation and components thereof can be reused. The rotor member includes a magnet mounting member having a first end and a second end, a plurality of magnets arranged radially outwardly of the magnet mounting member, and a tubular holding member arranged radially outwardly of the plurality of magnets and holds the magnets between the holding member and the magnet mounting member. The magnet mounting member includes a slit that radially penetrates the magnet mounting member and extends in a predetermined axial-direction section. | 12-17-2015 |
| 20150380999 | PERMANENT MAGNET MACHINE - A permanent magnet machine and a rotor assembly for the permanent magnet machine. The permanent magnet machine includes a stator assembly including a stator core configured to generate a magnetic field and extending along a longitudinal axis with an inner surface defining a cavity and a rotor assembly including a rotor core and a rotor shaft. The rotor core is disposed inside the stator cavity and configured to rotate about the longitudinal axis. The rotor assembly further including a plurality of permanent magnets for generating a magnetic field which interacts with the stator magnetic field to produce torque. The permanent magnets are disposed within one or more cavities formed in a sleeve component. The sleeve component configured to include a plurality of cavities or voids therein and thus provide minimal weight to the permanent magnet machine. The permanent magnet machine providing increased centrifugal load capacity, increased power density and improved electrical performance. | 12-31-2015 |
| 20160028282 | METHOD FOR PRODUCING A ROTOR - In a method for producing a rotor, permanent magnets are arranged about a lateral surface in a recess of a rotor body from a selected position, e.g. a central position of the longitudinal extension of the rotor body, toward one side or toward two sides along an axis of rotation of the rotor body in side-by-side disposition. An end plate band covers a variable gap formed as a result of manufacturing tolerances of the permanent magnets between an outer face of an outermost one of the permanent magnets and an inner surface of the recess in an area of the recess which is non-parallel to the lateral surface. Subsequently, the permanent magnets and the end plate band are covered with a sleeve. | 01-28-2016 |
