Abstract: A rotor includes a rotor core having magnet insertion holes in a number corresponding to a pole number, and a center hole. The rotor core has first slits and ribs alternately arranged in the circumferential direction along a periphery of the center hole, and second slits on an outer side with respect to the first slits in the radial direction. The first slits and the second slits are both equal in number to half or an integer multiple of the pole number. Each second slit is formed to cover the rib from an outer side in the radial direction. Each first slit has a length A1 in the circumferential direction and a width A2 in the radial direction. Each second slit has a length B1 in the circumferential direction and a width B2 in the radial direction. A1>A2, B1>B2, and A1>B1 are satisfied.

Abstract: In a rotor for a rotating electric machine, a key portion, a first stress relaxation groove, a second stress relaxation groove, and a protruding portion are provided at an inner periphery of a rotor core. The first stress relaxation groove is formed to be adjacent to the key portion in a circumferential direction of the rotor core. The protruding portion is formed between the first stress relaxation groove and the second stress relaxation groove, and is in contact with an outer periphery of a shaft.

Abstract: A rotor stack for connection to a shaft of a rotary electric machine includes a series of platters each centered about a centerline and including an opening for receiving the shaft such that the platters are stacked along the shaft. Passages extend through the platter and are arranged about the centerline. Permanent magnets are positioned in the passages. Hubs associated with the platters mechanically connect each of the platters to the shaft.

Abstract: An electric power steering assembly includes a rotor assembly that is rotatable about a longitudinal axis. The rotor assembly has an outer surface and an inner surface. The rotor assembly defines a plurality of magnet pockets that are disposed proximate the outer surface. The inner surface defines a plurality of rotor teeth.

Abstract: A rotor for a dynamo-electric machine includes a shaft and a rotor core constituted by laminating a plurality of electromagnetic steel sheets, and the rotor core is configured such that the shaft is attached to an inner periphery of the rotor core. Each of the electromagnetic steel sheets constituting the rotor core includes an insertion hole into which the shaft is inserted, and a key protruding radially inwardly from the insertion hole, the shaft includes a keyway formed along an axial direction, the shaft is attached by clearance fit to the insertion holes of the electromagnetic steel sheets, and the key is fitted by pressing into the keyway such that a side face of the key abuts on a side face of the keyway.

Abstract: A method of manufacturing a rotor includes mounting a plurality of core members to a shaft in a state by inserting the shaft into a shaft hole that penetrates through the plurality of core members in a height direction. An inner diameter of the shaft hole is larger than an outer diameter of the shaft. The method includes pressing the plurality of stacked core members together in the height direction to form a stack in which the plurality of core members are located adjacent to each other, and the shaft hole is engaged with the shaft.

Abstract: A sensor magnet assembly has a cylindrical shape extending in an axial direction and includes a fixing member fixed to a one side end of a shaft in the axial direction and a sensor magnet fixed to an outer circumferential surface of the fixing member. The fixing member includes a first groove recessed inward from the outer circumferential surface in a radial direction and has an annular shape extending in a circumferential direction and first recesses recessed inward from the outer circumferential surface in the radial direction and spaced apart along the circumferential direction. The first recesses are disposed at positions different from the first groove in the axial direction. The first groove and the first recesses are disposed in a portion of the outer circumferential surface of the fixing member, to which the sensor magnet is fixed.

Abstract: A contour line on the outer circumferential side of each magnet hole in the first layer is formed to be an arc passing through a total of three intersections, i.e., an intersection of a d axis and a reference magnetic flux line which is a magnetic flux line as a reference positioned inward by a predetermined number of magnetic flux lines from the outer circumferential edge of a rotor core, and intersections of: the reference magnetic flux line; and sides at the circumferential ends of the magnet hole which are positioned inward by a bridge dimension from the outer circumferential edge of the rotor core. Thus, a rotary electric machine that enables maximum utilization of reluctance torque and magnet torque and suppression of torque ripple can be obtained with simple processing and low cost.

Abstract: The moving part, designed to move past a fixed rotor with coils, comprises a metallic chassis to which magnets, arranged in parallel rows of alternating polarity, are bonded. Non-metallic fixing strips, screwed to the chassis, are positioned longitudinally between each row of magnets, extend along the entire length of these rows and mechanically immobilize the magnets. Each fixing strip comprises a bearing base with convex rounded flanks which immobilize the magnets vertically and collaborates with a concave rounded portion, formed in the adjacent edge face of the magnets over at least half of the height thereof. The strip also comprises a longitudinal upper extension acting as a spacer between the rows of magnets and immobilizing the magnets laterally. The invention is of benefit to the manufacturers of rotary or linear electrotechnical machines such as motors or generators.

Abstract: Torque is transmitted by way of a shaft having an axial groove formed as a keyway therein and a key held in the groove by means of a coin-shaped magnet located in a pocket formed in the floor of the groove. A second element, such as a coupling, is configured to receive the shaft and key therein and has a matching keyway.

Abstract: A rotor includes a plurality of magnets, and an annular rotor core having a plurality of magnet insertion holes formed in a circumferential direction, into which the magnets are respectively inserted, in which each of the magnet insertion holes is formed with a protruding portion A on an inner wall surface on an inner diameter side in a radial direction of the rotor, and each of the magnets is formed with a recessed portion that is fitted to the protruding portion A when the magnet is inserted into the magnet insertion holes. With this configuration, fixation of the magnets is facilitated, and generation of chipping and vibration noise due to a movement of the magnets at the time of activation or rotation can be suppressed, thereby enabling to provide the rotor having high quality and high reliability.

Abstract: A motor rotor and a method for manufacturing a motor rotor, enabling crimping of the resolver rotor at low cost with less influence on the detection accuracy. A motor rotor includes a resolver rotor and a rotor shaft to which the resolver rotor is affixed by crimping. The rotor shaft includes a first stepped section with which a crimping punch makes contact to deform the first stepped section, a second stepped section with which an end surface of the resolver rotor makes contact, and a cutout groove formed in a surface which is located near the first stepped section and with which an inner peripheral hole section of the resolver rotor makes contact. In the crimping operation, the first stepped section of the rotor shaft is bent within the cutout groove to form a crimping protrusion which presses the end surface of the resolver rotor.

Abstract: A rotor is provided with a rotor core, a shaft fastening hole provided at the center of the rotor core, and magnets provided to the outer circumferential portion of the rotor core. Circular arc slits are formed at intervals on double concentric circles, respectively, so as to be located around the shaft fastening hole of the rotor core. The slits are arranged in such a manner that the outside slits on the outer circle are each located so as to block the portions located in the intervals between adjacent inside slits on the inner circle.

Abstract: Provided is a rotor core of a motor, the rotor core, the rotor core including: a thin disk-shaped rotor core member; a shaft hole penetratively formed in a center of the rotor core member; a shaft press-fitted into the shaft hole; a plurality of magnet insertion holes penetratively formed at a position near to a periphery of the rotor core member for inserted coupling by a magnet; a plurality of teeth protrusively formed at an inner circumferential surface of the shaft hole, and a skived portion protrusively formed at a position corresponding to the plurality of teeth of the shaft, wherein the rotor core members are stacked each at a predetermined height, and the shaft is press-fitted into the shaft hole.

Abstract: Provided is a stacked rotor core of a motor, the rotor core including a thin disk-shaped rotor core member including a shaft hole extended to a direction of a rotation shaft, a key groove communicating with the shaft hole and a magnet, a shaft press-fitted into the shaft hole and concavely formed at a peripheral position corresponding to that of the key groove with a key accommodation groove, and at least one or more keys formed at the key groove and the key accommodation groove to restrict the rotor core member and the shaft.

Abstract: A motor is disclosed, the motor including a stator core formed with a cylindrical space at an inner surface and formed at an inner circumferential surface with a plurality of teeth protruding toward a center, a cylindrical rotor rotatably mounted at the space and formed with a plurality of pockets for inserting a permanent magnet, a rotation shaft coupled to the center of the rotor and receiving a rotation force generated by interaction between the stator core and the rotor, a nut member connecting the rotor to the rotation shaft by press-fitting the rotor at a periphery to an axial direction of the rotation shaft and press-fitting the rotation shaft at an inner circumferential surface to the axial direction of the rotation shaft, and a key unit inhibiting a slip between the rotor and the nut member.

Abstract: A rotor for an outer rotor-type motor is provided. The rotor includes a metallic coupler and a polymeric frame molded over at least part of the metallic coupler.

Abstract: A permanent magnet rotor including a shaft, a rotor core fixed to the shaft, a magnet disposed around the core, and a linker fixed relative to the shaft and located at one end of the core. An elastic clamping structure is arranged between the linker and the magnet such that rotational torque of the magnet is transferred to the shaft via the linker.

Abstract: Disclosed is a motor, the motor according to exemplary embodiments of the present disclosure including an insulator body coupled to a stator core wound with a plurality of coils applied with powers of mutually different polarities to prevent the coil and the stator coil from being short-circuited, a terminal housing coupling unit integrally formed with the insulator body to be coupled to a terminal housing supplying an outside power by being circumferentially protruded, and a coil guide unit formed at the terminal housing coupling unit to prevent coils connected to a terminal of each polarity installed at the terminal housing from being short-circuited.

Abstract: A fan including an impeller structure, a rotor structure and a stator structure is disclosed. The impeller structure includes a hub and a plurality of blades disposed around the outer periphery of the hub. The rotor structure includes a shaft and a magnetic element. The shaft is disposed through the magnetic element and connected to the hub. The magnetic element includes at least one terminal surface in the axial direction, and at least one receptacle is formed on the terminal surface. The stator structure is disposed around the outer periphery of the magnetic element. The heat dissipation system and the fan thereof can improve the reliability of the motor at high rotating speed effectively and prolong the lifetime of the shaft.

Abstract: A vacuum mechanical rotation-transmitting apparatus is disposed on a hollow member that defines a vacuum chamber. The apparatus includes an input shaft assembly, an outer shaft assembly extending into the input shaft assembly and the vacuum chamber, a spacer member disposed between the input and output shaft assemblies, a plurality of first magnetic units disposed on the input shaft assembly, and a plurality of second magnetic units disposed on the output shaft assembly. A magnetic attractive force is produced between the first and second magnetic units to allow for co-rotation of the output shaft assembly with the input shaft assembly.

Abstract: A rotor for a motor includes a shaft having an outer periphery with an engaging portion. At least one coupling member includes an engaging hole. The shaft extends through the engaging hole of the at least one coupling member. The at least one coupling member is engaged with the engaging portion of the shaft by tight coupling. A plastic magnet envelops the shaft and the at least one coupling member by injection molding. The at least one coupling member prevents the plastic magnet from disengaging from the shaft, providing enhanced engaging effect while reducing structural complexity and enhancing assembling convenience.

Abstract: A rotor for an electric machine having a number of poles includes a shaft that extends along a portion of an axis and defines an outer surface. A first core portion is formed as a single inseparable component and includes a first portion that extends from the outer surface to a first outside diameter to define a first thickness, and a second portion spaced axially from the first portion that includes a reduced back portion that extends from an inside diameter to the first outside diameter to define a second thickness that is less than the first thickness. A second core portion is connected to the first core portion and includes a second outside diameter that is substantially the same as the first outside diameter.

Abstract: Disclosed herein is an electric machine rotor. The rotor includes, a rotatable shaft, a plurality of pole segments attached to the shaft, and a plurality of magnets attached to the plurality of pole segments such that one of the plurality of magnets is positioned circumferentially between adjacent pole segments and each of the plurality of magnets has nonparallel circumferentially opposing sides.

Abstract: A fan including an impeller structure, a rotor structure and a stator structure is disclosed. The impeller structure includes a hub and a plurality of blades disposed around the outer periphery of the hub. The rotor structure includes a shaft and a magnetic element. The shaft is disposed through the magnetic element and connected to the hub. The magnetic element includes at least one terminal surface in the axial direction, and at least one receptacle is formed on the terminal surface. The stator structure is disposed around the outer periphery of the magnetic element. The heat dissipation system and the fan thereof can improve the reliability of the motor at high rotating speed effectively and prolong the lifetime of the shaft.

Abstract: A motor includes: a rotating shaft having a key groove formed in the peripheral surface of the rotating shaft; a rotor core having a through hole in which the rotating shaft can be received and a key portion formed on the inner surface of the rotor core defining the through hole, the key portion being fittable in the key groove; and a stress relaxation groove formed at a position adjacent to the key portion in the inner surface of the rotor core defining the through hole, and depressed away from the peripheral surface of the rotating shaft. The inner surface of the through hole is arc-shaped. A bottom surface of the stress relaxation groove, located radially outward in the inner surface of the stress relaxation groove, includes an arc portion centered at the center defining the through hole.

Abstract: In a motor, an insulator covering an armature core has a lid covering an end surface of the armature core. The lid has an inner ring disposed radially inside slots of the armature core and an outer ring disposed radially outside the slots. Each of a plurality of slot insulators inserted into the slots has a blocking portion at a position in the inner ring.

Abstract: A rotating shaft disclosed by the present invention includes a plurality of bumps spacedly formed along an outer circumferential surface thereof. The bumps are each formed with two engagement portions extending outwardly and bilaterally and a deformation space therebetween. The engagement portions undergo resilient deformation toward the deformation space when subjected to a force, thus providing stable engagement with a magnetic body, protecting the magnetic body from cracks and damages during assembling, and enhancing yield. The present invention further discloses a motor rotor having the above-described rotating shaft.

Abstract: Apparatus for assembling a permanent magnet rotor comprising a rotor fixture configured to slide over a smaller diameter bearing section of the rotor and abutting one end of a center axial section of the rotor and a split compression ring having an inner diameter that is sized to ride over the outer diameter of magnets in magnet carriers assembled on the rotor fixture.

Abstract: A permanent magnet rotor comprising a shaft, a rotor core fixed to the shaft, a magnet disposed around the core, and a linker fixed relative to the shaft and located at one end of the core; wherein an elastic clamping structure is arranged between the linker and the magnet such that rotational torque of the magnet can be transferred to the shaft via the linker.

Abstract: A permanent magnet rotor for an electric motor may include a rotor assembly that will hold the magnets in place. A pair of rings is added to the sleeve to tightly engage and press against the end plates and the magnets. This configuration provides additional securement against axial and radially shifting of the magnets.

Abstract: In a motor, an upper surface of a flange portion of a shaft is arranged axially below a bottom end surface of a rotor core. A spacer having an axial thickness slightly greater than that of the flange portion is arranged on a radially outer side of the flange portion. A bottom surface of the spacer makes contact with an end plate whose inner circumferential surface has a radius, centered about a central axis, smaller than a radius of the flange portion. The end plate is secured to the rotor core via a fixing member.

Abstract: A rotor for a motor includes a shaft having an outer periphery with a positioning portion. The positioning portion has non-circular cross sections perpendicular to a longitudinal axis of the shaft. A plastic magnet is formed on the outer periphery of the shaft by injection molding. The plastic magnet includes an inner periphery engaged with the positioning portion. Thus, the plastic magnet is prevented from disengaging from the shaft and from rotating relative to the shaft. As a result, the rotor has enhanced engaging effect between the shaft and the plastic magnet. Furthermore, the rotor has a simple structure to allow easy assembly.

Abstract: Apparatus and method for assembling a permanent magnet rotor comprising a rotor fixture configured to slide over a smaller diameter bearing section of the rotor and abutting one end of a center axial section of the rotor and a split compression ring having an inner diameter that is sized to ride over the outer diameter of magnets in magnet carriers assembled on the rotor fixture.

Abstract: An electromagnetic generator comprising a multilayer assembly of a first layer carrying at least one magnet, a second layer carrying at least one coil, and a third layer carrying at least one magnet, the at least one magnet of the first and third layers being configured to define therebetween a region of magnetic flux in which the at least one coil is disposed, at least one of the layers being shaped to define a respective displaceable portion thereof which is displaceable by vibration of the electromagnetic generator thereby to cause relative movement between the coil and the magnets and generate an electrical current in the coil.

Abstract: A rotating shaft disclosed by the present invention includes a plurality of bumps spacedly formed along an outer circumferential surface thereof. The bumps are each formed with two engagement portions extending outwardly and bilaterally and a deformation space therebetween. The engagement portions undergo resilient deformation toward the deformation space when subjected to a force, thus providing stable engagement with a magnetic body, protecting the magnetic body from cracks and damages during assembling, and enhancing yield. The present invention further discloses a motor rotor having the above-described rotating shaft.

Abstract: An insert comprising a lightweight structure configured for filling the gaps between axially spaced C-shaped lamination stacks and circumferentially spaced non-magnetic cradles on a permanent magnet rotor. The insert is secured to a rib by a dovetail tongue that fits within a dovetail groove provided along the length of each rib. The insert engages the adjacent cradles and has a circumferential surface that has the same radius of curvature as the top surface of the cradles.

Abstract: A method of pumping wellbore fluid, comprising the steps of: installing an electric submersible pump in a wellbore; and operating the pump at more than 4,500 rpm to pump the wellbore fluid. Pumping in this manner provides a number of advantages in use in that the required high-speed motor and pump is shorter for a given power than existing arrangements, and provides increased reliability due to reduced complexity. A much shorter motor/pump combination also allows such equipment to be used in deviated boreholes with a reduction in damage due to mishandling and bending, as well as facilitating assembly and testing in the manufacturer's plant.

Abstract: A method of pumping wellbore fluid, comprising the steps of: installing an electric submersible pump in a wellbore; and operating the pump at more than 4,500 rpm to pump the wellbore fluid. Pumping in this manner provides a number of advantages in use in that the required high-speed motor and pump is shorter for a given power than existing arrangements, and provides increased reliability due to reduced complexity. A much shorter motor/pump combination also allows such equipment to be used in deviated boreholes with a reduction in damage due to mishandling and bending, as well as facilitating assembly and testing in the manufacturer's plant.

Abstract: An efficient and reconfigurable permanent magnet generator that comprises a permanent magnet subassembly and at least one exciter is disclosed. The permanent magnet generator may comprise a mainframe comprising at least one exciter, and a permanent magnet subassembly comprising a plurality of magnets that are arranged to form at least one air gap between facing magnetic poles in which the at least one exciter resides and that are reconfigurable for alternating current or direct current operation by inversion of respective magnetic poles. The at least one exciter may comprise a plurality of alternating layers of a first material and a second material, where the first material may comprise a superconductive material and the second material may comprise a non-superconductive material, and wherein the layers of the superconductive material are thin relative to the thickness of the layers of the non-superconductive material.

Abstract: A rotor for a reluctance type rotating machine includes a rotor core formed by stacking a number of annular core materials each of which includes magnetic concave and convex portions. The rotor core has two keys which are formed at two positions on an inner circumference of the rotor core. The positions are spaced 180 degrees apart from each other with respect to the rotor core. The rotor core is divided into a plurality of blocks and the core materials constituting at least one block have the magnetic concave and convex portions shifted by a predetermined angle relative to the core materials constituting the other or another block on the basis of a center line passing through the keys. A whole or part of the core materials of at least one block are located circumferentially 180 degrees apart form the core materials constituting the other or another block.

Abstract: A rotor for a reluctance type rotating machine includes a rotor core formed by stacking a number of annular core materials each of which includes magnetic concave and convex portions alternately formed on an outer circumference thereof and a central through hole, the rotor core having a key axially extending on an outer circumference, the rotor core being divided into a plurality of blocks, the core materials constituting one of at least three blocks having the magnetic concave and convex portions shifted by a predetermined angle in one of a rotating direction of the rotor and a direction opposite the rotating direction of the rotor relative to a center line passing the key, the core materials constituting each one of the blocks located at both ends of the one block having the magnetic concave and convex portions shifted by a predetermined angle in the other of the rotating direction of the rotor and the direction opposite the rotating direction of the rotor relative to a center line passing the key, and a ro

Abstract: A magnet cradle for supporting a permanent magnet in an overhung recessed slot on the surface of a permanent magnet rotor having an axis of rotation. The cradle is non-magnetic and comprises a top and bottom wall abutting the permanent magnet. The cradle is sized to hold the permanent magnet within the overhung slots. Axial end walls generally perpendicular to the axis of rotation have circumferential edges configured to directly abut overhung portions of the slots. The total axial length of the top and bottom walls of the cradles in the axial direction are greater that the total axial length of the magnet, thereby permitting a magnet to fit between the axial end walls of the cradle without the cradle in the magnetic flux path of the magnet.

Abstract: There is provided a motor-driven system which realizes an optimum driving mode for an electric automobile, a robot carrier car, a drum of a copying machine, etc., and a motor-driven system having a function as an optimum actuator for such driving.

Abstract: A magnetic material fixing structure of motor rotor including multiple overlapping silicon steel plates. An outer circumference of each silicon steel plate is recessed to form multiple receptacles at equal intervals. A magnetic material is disposed in each receptacle. The receptacle has two lateral faces, a bottom face and an opening opposite to the bottom face. Each of adjoining sections of the two lateral faces and the bottom face is formed with a dented section dividing the lateral faces and bottom face of each receptacle into multiple resilient plates. When inlaying the magnetic material into the receptacle, the resilient plates are deformed to resiliently tightly clamp the magnetic material.

Abstract: A rotor (10) for a miniature electric motor includes a magnet (12) having a rotation axis (14) and a shaft (16) fixed concentrically to the magnet. The magnet (12) includes a through hole (20) extending coaxially with the rotation axis (14). The shaft (16) includes a portion (24) fitted in the through hole (20). The portion (24) has an axial interengagement length (t1) shorter than an axial length (T1) of the through hole (20). The rotor (10) also includes reinforcing means provided at least inside the through hole (20). The magnet (12) comprises an annular magnet material (18), and a coating (22) formed on a surface of the magnet material and arranged at least inside the through hole (20). The reinforcing means is formed as the coating (22) of the magnet (12), and acts to ensure a fixing force to securely hold the shaft (16) in a predetermined position on the magnet.

Abstract: A pole wheel of the type driven in rotation by a shaft employs a sensor system disposed on the pole wheel for detecting rotations of the shaft. The pole wheel includes a first component in the form of a hollow magnet body and a second component that is disposed as a retaining part for the first component and is seated firmly on the shaft and is embodied integrally, for the sake of streamlined connection to the first component, with connecting means. Recesses, which for instance can be embodied in groovelike fashion, may be disposed on the second component, that is, the retaining part seated solidly on the shaft, and the first component is injected molded onto the second component, creating positive engagement connecting means comprising the material of the magnet body.

Abstract: A rotor for an electric machine which rotor includes a multi-faced shaft, a plurality of pole pieces and permanent magnets carried by the shaft and a plurality of the rods extending between a pair of lateral flanges and passing through the pole pieces between the flanges to retain the pole pieces on the shaft, the pole pieces retaining the magnets on faces of the shaft.

Abstract: A permanent magnet synchronous motor system. The system uses a permanent magnet AC synchronous motor having an elongated housing, of the type used in progressive cavity pumping applications. Within the stator, a multi-section rotor is rotatably mounted. The rotor includes a plurality of rotor sections that are angularly offset from each other. The rotor sections are mounted on a drive shaft, and the sum of the offsets is generally comparable to the angular displacement undergone by the drive shaft under a normal operating load.