Abstract: An impeller is provided that may be used in compressors or turbines. In another aspect of the present invention, a fiber or a bundle of fibers is woven to form at least two blades of an impeller. Yet another aspect of the present invention employs a peripheral component woven around impeller blades. An additional conductive fiber or bundle of fibers is woven into the impeller in a further aspect of the present invention. Moreover, an aspect of the present invention provides a chilling system that includes at least one compressor, at least one wave rotor, and a refrigerant.

Abstract: A motor, including at least a stator, including at least a stator core and a coil winding, and a rotor, including at least a rotor core and multiple permanent magnets. Multiple wire receiving grooves are disposed on the stator core. The permanent magnets are disposed on the rotor core. The ratio between the number of teeth of the wire receiving grooves and that of the permanent magnets is 3:2. Every two or three of the permanent magnets form a group of permanent magnets. A gap is disposed between adjacent groups of permanent magnets. The groups of permanent magnets are circumferentially distributed. Magnetic polarities of the permanent magnet are alternatively distributed in a N phase and a S phase. Difference in an electric angle between centers of polarities of adjacent permanent magnets in one group is between 150 degrees and 170 degrees.

Abstract: An assembly for mounting magnets on a steel sheet rotor pack, the assembly including a plurality of baseplates made of a magnetic material and fixed to the rotor pack, and a plurality of magnets being in turn fitted to each baseplate. In one embodiment, the baseplates are fixed to the rotor pack by means of inner locking bars housed in axial ducts provided inside said rotor pack. The baseplates are fitted to the inner locking bars by fixing means passing through longitudinal channels connecting the axial ducts and the outer surface of the rotor pack.

Abstract: The present invention provides a dynamoelectric machine and a method for manufacturing a rotor therefor that can hold permanent magnets stably for a long time by a simple magnet holding construction.

Abstract: A magnetic component part for a rotor assembly of an electromechanical transducer is provided. The magnetic component part includes a base element having a first side and an opposing second side, a permanent magnet, attached to the base element at the first side, and a mounting structure fixed to the base element at the second side and adapted to be mechanically connected to a support structure of the rotor assembly. The permanent magnet is located in an offset position with respect to a central axis of the mounting structure, which central axis extends from the mounting structure through the second side to the first side. A rotor assembly, an electromechanical transducer and a wind turbine, which are all equipped with at least four magnetic component parts are also provided as well as a method for manufacturing a rotor assembly including at least four magnetic component parts.

Abstract: Exemplary embodiments of the present invention relate to an induction motor including a stator having a circular cross-section and an inner passage having a longitudinal axis defining a bore, a solid core steel rotor having a circular cross-section rotatably disposed within the bore of the stator, and an air gap disposed between the rotor and the stator. A copper conductive layer is disposed on the steel rotor to increase the electrical conductance of the rotor. Exemplary embodiments adhere the copper conductive layer to the steel rotor using Hot Isostatic Pressing (HIP). The HIP process encloses the steel rotor and the copper conductive layer in a containment vessel, and adheres the conductive layer to the rotor by applying high temperature and high gas pressure to the outside of the containment vessel.

Abstract: A rotor (24) for a rotary electric machine (20), mainly for the automotive industry, that comprises a front polar wheel (46N) and a rear polar wheel (46S), each polar wheel (46N, 46S) including claws (52) extending axially towards the other polar wheel (46N, 46S), each claw (52) of a polar wheel (46N, 46S) being circumferentially interleaved between two claws (52) of the other polar wheel (46N, 46S), at least two interpolar gaps (62) being provided between the side faces (60) opposite two consecutive claws (52), and at least two members (68) defining a magnetic barrier being provided in two interpolar gaps (62) associated on either side of a predetermined claw (52D). The front longitudinal ends (72) of the two members (68) are connected by a connector (82) in order to define an open chain (80).

Abstract: A stator and a rotor are oppositely arranged having a gap between the stator and the rotor in a direction parallel to a rotary shaft. The rotor has permanent magnets forming field magnetic poles and soft magnetic material segments to cover at least stator-facing surfaces of the respective permanent magnets. Each of the soft magnetic materials forms a composite part together with the permanent magnet. The rotor further has a disc-shaped nonmagnetic molded frame molded so as to cover the periphery of the composite part including the permanent magnet and the soft magnetic material segment while leaving a stator-facing surface of the soft magnetic material segment as an exposed surface. The composite part (including the permanent magnet and the soft magnetic material) and the nonmagnetic molded frame are integrated by molding of the molded material.

Abstract: A motor rotor has a resin-impregnated thread layer formed by winding a thread of a reinforced fiber material around a permanent magnet layer with a gap between an outer peripheral surface of the thread layer and an inner peripheral surface of a cylindrical body, and impregnating the thread layer with a curable resin. A subsequent thread layer is formed by leading a continuous thread into an annular passage through thread passing recesses, winding the continuous thread around a bottom portion of the passage, and impregnating the subsequent thread layer with a curable resin. A curable resin is injected into the gap between the outer peripheral surfaces of the thread layer and the subsequent thread layer and the inner peripheral surface of the cylindrical body through resin injection passages and/or the thread passing recesses before heating and curing.

Abstract: A permanent magnet rotor arrangement that is particularly suitable for low-speed large-diameter electrical generators includes a rotor 2 having a radially outer rim 4. A circumferential array of magnet carriers 12 is non-releasably affixed to the outer rim 4 of the rotor and have a radially outer surface. An inverted U-shaped pole piece retainer 18 made of non-magnetic material such as stainless steel is affixed to each magnet carrier 12 and is formed with an axially extending channel. At least one pole piece 16 made of a magnetic material such as steel is located adjacent to the radially outer surface of each magnet carrier 12 and in the channel formed in its associated pole piece retainer 18.

Abstract: An axial gap rotating machine rigidly fixing permanent magnets without reducing magnetic flux and having a high output has: a housing; a rotating shaft rotatably supported in the housing; two rotors having disks rotatably integral with the rotating shaft, and permanent magnets arranged concentrically in spaced relation to each other on at least one side of surfaces of the rotating disks in spaced relation to each other on at least one side of surfaces of the rotating disks in spaced relation to each other; and a stator arranged between the rotors, spaced from the rotors and fixed to the housing, the stator having a plurality of coils disposed concentrically around the rotating shaft spaced from each other; wherein magnetic flux generated from the permanent magnets of the rotors intermittently penetrates the interior of each of the coils as the shaft rotates, wherein the rotating disk has a concave portion in the surface facing the stator in which the permanent magnets are disposed so as to protrude.

Abstract: A rotor for a permanent-magnet motor includes a rotor-core surface, a plurality of ridges provided on the rotor-core surface and extending in an axial direction of the rotor, a plurality of areas defined by the ridges, and a plurality of permanent magnets provided on the rotor-core surface within the areas and arranged along sidewalls of the ridges, the sidewalls being on one side in a peripheral direction of the rotor.

Abstract: A hub includes first and second side surfaces respectively opposed to inner and outer circumferential surfaces of an upper portion of a magnetic member, and a ceiling surface arranged to interconnect an upper ends of the first and second side surfaces. The adhesive agent is interposed between the inner circumferential surface of the upper portion of the magnetic member and the first side surface of the hub and between the upper surface of the magnetic member and the ceiling surface of the hub. Radial distance between the inner circumferential surface of the upper portion of the magnetic member and the first side surface of the hub and axial distance between the upper surface of the magnetic member and the ceiling surface of the hub are smaller than radial distance between the outer circumferential surface of the upper portion of the magnetic member and the second side surface of the hub.

Abstract: A motor for driving an actuator used such as for a throttle valve of an automobile engine and an optical axis controller of an automobile headlight. In two cup-shaped rotor yokes each provided with an internal diameter enlarged part at its opening, a ring-shaped joint material with an external diameter fitting into this internal diameter enlarged part is inserted into the internal diameter enlarged part to form a rotor yoke assembly. A motor is available with high durability against vibration and shock owing to high accuracy in dimensions, lightweight, and high rigidity of the rotor.

Abstract: A rotating machine with a permanent magnet rotor that is easier, lower cost, and lighter includes a plurality of permanent magnet assemblies (20) mounted on a rotor body (1). The magnet assemblies (20) are mounted via magnet holders that each include a pair of claws (2, 3) connected by a bridge (5) and forming a seat for a respective magnet assembly (20). The claws have terminal expansions (11) that extend beyond the bridge (5) and form a second seat in which a tightening section (9) is received. The claws (2, 3) can elastically pivot about the bridge (5) when the terminal expansions (11) are squeezed together or forced apart, allowing insertion of and securing the magnet assembly, respectively.

Abstract: A motor is disclosed. In accordance with an embodiment of the present invention, the motor includes a stator and a rotor, which is supported by the stator such that the rotor rotates. Here, the rotor includes a rotational axis, which is supported by the stator such that the rotational axis rotates, a rotating body, which rotates together with the rotational axis, and a hub, which has a ring-shaped body and a protruding part. Here, the ring-shaped body is interposed between the rotational axis and the rotating body, and the protruding part extends an outer circumferential surface of the ring-shaped body coupled to the rotating body. Thus, the motor can improve the coupling strength between the rotational axis and the rotating body, securing the rotating rotor's stability.

Abstract: A rotor body for an electric motor is comprised of connecting outer peripheral portions of first and second flange members made of electrically conductive material to the opposite ends of a plurality of connection members made of electrically conductive material of weak magnetic material arranged at predetermined distances therebetween in the circumferential direction with bolts and by supporting induction magnetic poles made of soft magnetic material between the connection members which are adjacent in the circumferential direction. Coupling portions of the first and second flange members and the connection member are electrically insulated by insulation coating so that an eddy current flowing in a closed circuit comprised of the first flange member, the connection member, the second flange member and the other connection member can be reduced and heat dissipation and energy loss accompanied by the eddy current can be minimized at the time of an operation.

Abstract: A rotor for motor may include a rotation shaft, a permanent magnet structured in a tube-like shape and fixed to an outer peripheral side of the rotation shaft, and a sleeve which is structured in a tube-like shape, disposed between an outer peripheral face of the rotation shaft and an inner peripheral face of the permanent magnet, and press-fitted and fixed to the outer peripheral face of the rotation shaft. The sleeve is retreated from an end part of the permanent magnet on one side in an axial direction to the other side in the axial direction so that a first ring-shaped recessed part is formed between the rotation shaft and the permanent magnet and the rotation shaft and the permanent magnet are fixed to each other with a first adhesive in the first ring-shaped recessed part. The rotor may be applied to a motor, preferably to a stepping motor.

Abstract: A motor rotor includes a hub having a peripheral wall. A metal ring includes an engaging portion. The metal ring is formed by bending a strip of metal plate to form a cylindrical ring. The metal plate includes first and second positioning portions on two ends thereof. The first and second positioning portions are coupled with each other to form the engaging portion. The metal ring is coupled to an inner peripheral face of the peripheral wall of the hub. A magnet ring is coupled to an inner peripheral face of the metal ring.

Abstract: A spindle motor is provided. The spindle motor includes a base, a bearing housing, a bearing, a rotation shaft, a stator, a bushing, and a rotor. The bearing housing is installed on the base. The bearing is fixed inside the bearing housing. The rotation shaft is installed to be supported by and rotate on the bearing. The stator is disposed around the bearing housing. The bushing is coupled to the rotation shaft. The rotor is coupled to the bushing to rotate through interaction with the stator.

Abstract: A motor includes a shaft supporting a rotation of a rotor, a sleeve supporting the shaft such that an upper end of the shaft protrudes upward in an axial direction, a rotor case having a rotor hub, which is forcibly inserted and fixed to a protrusion of the shaft, and rotated by a rotation of the shaft, and an adhesive sealing space formed on an insertion surface between the protrusion and the rotor hub.

Abstract: An apparatus and method for the installation and removal of permanent magnets in a permanent magnet electromechanical machine, for example a wind turbine power unit generator. A magnet holder is mounted on a magnet carrying structure such as a rotor. Permanent magnets may be inserted into and removed from the magnet holder after the electromechanical machine is assembled. In this manner, permanent magnets may be installed on the magnet carrying structure by an interference fit, without using bolts or adhesives, to facilitate both assembly and removal for maintenance and repair.

Abstract: A bilayer magnetic electric motor comprises a rotor and a stator. The rotor has a casing and an iron ring provided in the casing. The internal and external surfaces of the iron ring are respectively disposed with a plurality of circularly arranged first and second magnets. The stator is located in and axially connected to the casing and includes a plurality of internal stator coil sets and a plurality of external stator coil sets that are respectively arranged in a circular array. Accordingly, when the stator is combined with the rotor, the iron ring and the first and second magnets are located in a circular space between the internal and external stator coil sets, and the first and second magnets respectively correspond to the internal and external stator coil sets. Consequently, the output power is increased when the rotor rotates and the size of the electric motor is also decreased.

Abstract: A pole piece structure is provided to be used as part of an active rotor structure for an electrical rotary machine, wherein the active rotor structure is circular comprising pole pieces and permanent magnets magnetised in the circumferential direction of the rotor structure, wherein the rotor pole piece structure is a single structure with at least two individually spaced pole pieces connected by an integration bridge. Further provided is a method of manufacturing a rotor pole piece structure and a rotor for an electrical machine with a rotor pole piece structure. The assembly of magnets to the pole pieces is significantly enhanced using these rotor pole piece structures as described.

Abstract: A permanent magnet machine is disclosed. The permanent magnet machine includes a stator, and a rotor comprising a rotor core and disposed outside and concentric with the stator, wherein the rotor core comprises a contiguous volume disposed around a plurality of permanent magnets, wherein the contiguous volume simultaneously supports a magnetic flux generated by the permanent magnets and provides mechanical support and containment for the permanent magnets, during operation of the permanent magnet machine. A rotor for a permanent magnet electric machine is also disclosed.

Abstract: The invention relates to an electric drive having a stationary outer and inner stator and a rotor, a plurality of permanent magnet elements being disposed on the rotor for producing an excitation flux and at least one electrical field coil being provided. The rotor comprises at least one bell-shaped part having a cylindrical wall and a base wall. Said base wall is mounted perpendicularly and the cylindrical wall coaxially in relation to the axis of the rotor shaft. The base wall is connected to the rotor shaft for transmitting a force or a torque. The permanent magnet elements rest on one side on the cylindrical wall and are secured side by side to the rotor of the drive in the peripheral direction. The permanent magnets, interact with the outer and inner stator, to give magnetic circuits which completely extend through the cylindrical part of the rotor in the radial direction, the permanent magnet elements being arranged only on the exterior of the cylindrical wall.

Abstract: A rotor (300) for an axial-flux electrical machine is disclosed. The rotor has a plurality of permanent magnets (350) fixed thereto, with each of the plurality of magnets extending at least partly through an aperture in the rotor. The arrangement is such that material of the rotor (200) abuts each magnet (350) so as to locate the magnet substantially circumferentially with respect to the axis of rotation of the rotor and substantially axially in at least one axial direction. The magnets (350) may slide radially onto the rotor (300) and be constrained axially and circumferentially by a tongue-and-groove arrangement (325, 355), with reinforced tape (340) being wound around the radially outer edge thereof to provide radial constraint.

Abstract: A motor is disclosed. In accordance with an embodiment of the present invention, the motor includes a stator and a rotor, which is supported by the stator such that the rotor rotates. Here, the rotor includes a rotational axis, which is supported by the stator such that the rotational axis rotates, a rotating body, which rotates together with the rotational axis, and a hub, which has a ring-shaped body and a protruding part. Here, the ring-shaped body is interposed between the rotational axis and the rotating body, and the protruding part extends an outer circumferential surface of the ring-shaped body coupled to the rotating body. Thus, the motor can improve the coupling strength between the rotational axis and the rotating body, securing the rotating rotor's stability.

Abstract: The rotor 11 of an axial gap type motor 10 is provided with a plurality of main magnets 41 respectively magnetized in an axial direction of a rotational axis and disposed at predetermined intervals in a peripheral direction, a plurality of yokes 42 structured by a laminated member 71 produced by winding a tape-shaped electromagnetic steel plate 60 and respectively disposed on both sides of the main magnets 41 in the axial direction, and a rotor frame 30 made of a die-cast alloy and including a plurality of ribs 31 respectively interposed between the main magnets 41 adjoining each other in the peripheral direction and extending in the radial direction, and an inner cylindrical portion 32 and an outer cylindrical portion 33 respectively formed on the radially inner side of the ribs 31 and on the radially outer side of the ribs 31.

Abstract: An outer rotor motor comprises a rotor rotating about an axis, and a fixed stator. Provided over the inner peripheral surface of a cylindrical part of a fan connecting resin member are a ring-shaped yoke, a ring-shaped rotor magnet fixed to a fixing slot defined in the radially inner surface of the yoke, and yokes fixed to fixing slots defined in a radially inner surface of the rotor magnet. The rotor magnet is so magnetized that magnetic poles alternately change in a circumferential direction. The yoke covers a radially outer surface of the rotor magnet, and parts on a radially outer side of an axially upper surface and an axially lower surface of the rotor magnet.

Abstract: A BLDC electric motor assembly (24) includes a rotor (42) having a plurality of magnet segments (50) securely retained thereabout by an annular ring (68) which is shrunk in situ in an electromagnetic forming operation. The magnet segments (50) are formed with tongues (62, 64) on their upper and lower ends (56, 58). One tongue (64) seats in a retaining pocket (48) molded on the rotor shaft (40), whereas the other tongue (62) provides a ledge into which the ring (68) seats. After the magnet forming operation, wherein the ring (68) is shrunk, the outer surface of the ring (68) is flush with the outer surfaces (54) of the magnet segments (50).

Abstract: A magneto generator can increase a suppression force to suppress permanent magnets from being moved to an opening side of a flywheel with easy construction and at low cost. In this magnet generator, the flywheel has a groove formed on its inner peripheral wall surface at an opening side thereof, and a magnet positioning member has a magnet coming-off preventing member formed at the opening side of the flywheel so as to cover end faces of the permanent magnets, with a protrusion being formed on the magnet coming-off preventing member so as to engage the groove in the flywheel. The protrusion is in engagement with the groove whereby the movement in an axial direction of the permanent magnets can be suppressed.

Abstract: A stacking alternator includes a supporting frame, at least one stationary armature device securely supported by the supporting frame and at least two rotating magnetic devices rotatably supported by the supporting frame two sides of the stationary armature device respectively, wherein the rotating magnetic devices are arranged to be driven to move with respective to the stationary armature device so as to produce a relative movement between the stationary armature device and the rotating magnetic devices for generating a predetermined amount of electrical current at the stationary armature device, wherein the stationary armature device and the rotating magnetic devices are alignedly and spacedly supported by the supporting frame to form a stacking structure of the stationary armature device and the rotating magnetic devices.

Abstract: A method for manufacturing of a permanent magnet pole piece comprising at least one magnet which is fixed to a base plate, a protective cover and a filling mass is provided, comprising the steps of fixing of the protective cover to the base plate so that it covers the magnet and so that the protective cover and the base plate are hermetically sealed jointed, evacuating of the interior cavity between the protective cover and the base plate through an opening, injecting of the filling mass through an opening into the interior cavity between the protective cover and the base plate and curing of the filling mass.

Abstract: A permanent magnet rotor for use on an electrical generator comprises a hub having an outer peripheral surface and an inner peripheral bore centered on an axis. The inner peripheral bore is provided with a screw thread at least over a portion of an axial dimension. Permanent magnets are mounted on the outer peripheral surface of the hub. A containment band is positioned radially outwardly of the magnets, holding the magnets and the hub together. The hub, a generator rotor incorporating the permanent magnet rotor, and a generator incorporating the permanent magnet rotor are also disclosed and claimed in this application.

Abstract: A rotor (11) for an electric machine with low-inertia permanent magnets (13) located between the poles (15) of the electric machine and a rotor hub, where the rotor hub is comprised of an internal ferrule (21) and an intermediate ring (23) between it and said magnets (13), with said intermediate ring (23) being made of an amagnetic material (such as aluminium, a composite material or a plastic material) of minimum thickness which prevents flux losses, and with the internal ferrule (21) being made of a metal material (such as cast iron or steel) with sufficient thickness to resist, together with the intermediate ring (23), the mechanical stresses caused by rotor (11) operation.

Abstract: A method for assembling rotors which is applicable to a large axial gap type permanent magnet rotating machine is provided. A permanent magnet rotating machine comprising: a rotating shaft; at least two rotors comprising a table-like structure and permanent magnets attached thereto, the table-like structures being connected to the rotating shaft and being disposed in an axial direction of the rotating shaft; and a stator comprising a table-like structure and stator coils around which a copper wire is wound, said stator being disposed in a gap formed by the rotors so that the stator being separated from the rotating shaft, is manufactured by the following steps of: assembling the two rotors such that a predetermined gap is formed therebetween; and mounting the magnets on the table-like structures by inserting the magnet from the radially outer side of the table-like structures towards the center of the rotation with the assembled state being maintained.

Abstract: A permanent magnet apparatus (10) for achieving electrical performance is provided. The apparatus (10) includes a cylindrical stator assembly (12) having a plurality of stator pole assemblies (92) and a cylindrical rotor assembly (14) having a plurality of rotor pole assemblies (20). Each stator pole assembly (92) includes a wire coil (102) and a laminated stack (98) of axially aligned stator segments (100). Each of the stator segments (100) has a center-post portion (106) that is detachably engaged to a back-iron portion (104). Each rotor pole assembly (20) is provided with a laminated stack (28) of axially aligned rotor segments (30) to which is secured a permanent magnet (32). Preferably, the stator pole assemblies (92) are secured to a base plate (26) by fastening rods (74) and the stator assembly (12) includes stacks (156) of back-iron portions (104) where each stack (156) is positioned to abut two stator pole assemblies (92).

Abstract: A stepping motor has a stator and a rotor disposed to surround the stator. The rotor has an annular magnet which has a plurality of magnetic poles formed along a circumference thereof, and a comb-teeth-shaped back yoke which is disposed to surround the magnet and has a plurality of comb teeth, the comb teeth facing boundary positions of adjacent magnetic poles.

Abstract: Disclosed is a torque rotor and method for manufacturing the torque rotor having an effect of preventing inflow of plastic between a yoke and a magnet during a conventional plastic injection molding process for forming an assembling structure after assembling between the yoke and the magnet, thereby preventing degradation of a roundness of the magnet or damage of the magnet due to the difference in the temperature expansion coefficients, and preventing idle rotation of the yoke and the magnet relative to each other.

Abstract: A motor driven assembly includes a motor having a motor shaft mounted for rotation about a rotational axis and a rotor radially located about the shaft. The motor drives a compressor that receives air from the motor, compresses the air, and circulates the compressed air to a space. The motor includes a first cooling flow passage and a second cooling flow passage that each receive air to provide internal cooling of the motor. A portion of the air compressed in the compressor is diverted from the compressor to a heat exchanger. The heat exchanger cools the compressed air from before the air circulates into the first cooling flow passage to cool the motor. The second cooling flow passage receives air from the environment surrounding the motor driven assembly to further cool the motor.

Abstract: 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 (23) secured in fixed rotative engagement to one of the end faces of a magnet device (21, 22) and for form-fitting or force-locking connection to a shaft (25). This makes it possible to eliminate the need for a special bearing sleeve, and the laminated armature core (21) can be provided with a larger axial hole diameter. As a result, the minimum joint pressure can be reduced so that deformations of the spindle and complicated refinishing processes can be avoided. In addition, less stringent manufacturing tolerances of the spindle (25) can be selected.

Abstract: The axial gap motor includes the rotor having: a rotor frame including a plurality of ribs extending in a radial direction, an inner circumferential side annular shaft, and an outer circumferential side annular rim, which are integrally coupled to each other through the ribs; the shaft has shaft side rib mounting holes through which the ribs are mounted, the rim has rim side rib mounting holes through which the ribs are mounted, the ribs have radial inner ends mounted and fixed into the shaft side rib mounting holes and radial outer ends mounted and fixed into the rim side rib mounting holes, and in the rotor frame, the main magnets and the sub magnets are alternately disposed in the circumferential direction, between the shaft and the rim.

Abstract: A dynamoelectric machine includes first and second magnet seat portions disposed to project from portions of first and second yoke portions that face respective inner circumferential surfaces near tip ends of second and first claw-shaped magnetic pole portions, and magnet housing portions disposed integrally to extend axially outward from outer circumferential portions of a pair of flange portions of a bobbin, extend near the first and second yoke portions that face the inner circumferential surfaces near the tip ends of the first and second claw-shaped magnetic pole portions, and be held by the first and second magnet seat portions.

Abstract: A rotor unit includes a substantially circular plate shaped cover portion, a rotor hub including a lower cylinder portion, and a magnetic field generating member attached on the lower cylinder portion. An annular salient portion is provided on the lower surface of the cover portion 31. The annular salient portion lies radial inwards of the lower opening of the through-hole of the cover portion and protrudes downwards in the shape of a ring whose center coincides with the central axis. The magnetic field generating member includes a rotor magnet and a back iron covering the outer surface and upper surface of the rotor magnet. When the magnetic field generating member is mounted to the rotor hub, the upper portion of the back iron comes in contact with the annular salient portion, which determines the axial position of the magnetic field generating member.

Abstract: Assembly precision in a motor is improved and greater cost reduction is achieved. A fluid dynamic bearing apparatus 1 comprising a housing 7 and bearing sleeve 8 as fixed-side members 2, a shaft member 9 as a rotational-side member 3 having a portion 3c for mounting a rotor magnet 5, and a disk hub 10, the shaft member 9 being supported by the bearing sleeve 8 in the radial direction in a non-contact manner by the hydrodynamic effect of a lubricating oil produced in a radial bearing gap between the inner circumferential surface 8a of the bearing sleeve 8 and the outer circumferential surface 9a of the shaft member while the shaft member 9 is in rotation, the apparatus 1 comprising a disk hub 10 which is fixed on the shaft member 9 and has a portion 3c for mounting the rotor magnet 5, and the disk hub 10 being a molded resin article formed by insert-molding using the shaft member 9 as an insert piece.

Abstract: A disc driving device includes a rotor assembly including a cylindrical rotor frame, a magnet arranged inside the rotor frame concentrically therewith so as to form a cylindrical space, a shaft fixed at one end thereof with the center hole of the shaft holder formed at the rotation center of the rotor frame, and a bearing for supporting the rotor assembly. The center hole of the shaft holder includes a small-diameter portion at the bottom thereof in the axial direction of the shaft, and an inclined portion which is formed above the small-diameter portion in such a manner as to be tapered and expanded upward in the axial direction. The shaft holder and the shaft have a void therebetween, which is filled with ultraviolet curing adhesive so as to form an adhesive fastening portion.

Abstract: Provided are a radial core type brushless direct-current (BLDC) motor and a method of making the same, having an excellent assembly capability of division type stator cores in a double rotor structure BLDC motor. The BLDC motor includes a rotational shaft, an integrated double rotor including an inner rotor and an outer rotor, and a rotor supporter wherein a trench type space is formed between the inner rotor and the outer rotor, and an end extended from the inner rotor is connected with the outer circumferential surface of a bushing combined with the rotational shaft, and an integrated stator wherein one end of the stator is disposed in the trench type space and an extension axially extended from the other end of the integrated stator is fixed to the housing of the apparatus.

Abstract: Provided are a radial core type brushless direct-current (BLDC) motor and a method of making the same, having an excellent assembly capability of division type stator cores in a double rotor structure BLDC motor. The BLDC motor includes a rotational shaft, an integrated double rotor including an inner rotor and an outer rotor, and a rotor supporter wherein a trench type space is formed between the inner rotor and the outer rotor, and an end extended from the inner rotor is connected with the outer circumferential surface of a bushing combined with the rotational shaft, and an integrated stator wherein one end of the stator is disposed in the trench type space and an extension axially extended from the other end of the integrated stator is fixed to the housing of the apparatus.

Abstract: Provided is a cover-integrated stator that is used to make a BLDC Brushless Direct-Current motor having a stator of a division core structure and a double rotor for use in a drum-washing machine, a slim type motor, and a direct drive apparatus for use in the drum-washing machine.