Abstract: A rotor assembly for mounting a rotor to a motor shaft having a rotor with a centrally positioned central bore, the diameter of which is slightly larger than a diameter of the motor shaft, a first stepped bore intersecting the central bore and being aligned along a first axis of the rotor, and a second stepped bore also intersecting the central bore and being aligned along a second axis of the rotor. A first cam fastener is disposed within the first stepped bore, and a second cam fastener is disposed within the second stepped bore. Upon rotating the first and second cam fasteners, they engage the motor shaft thereby securely clamping the rotor to the motor shaft.

Abstract: A built-in motor type spindle device comprising a housing and a spindle, wherein said spindle device further includes static pressure bearings which support the spindle so that the spindle can rotate freely relatively to the housing, two lines of magnetic field generating members which are provided on the spindle, and two pairs of coils which are provided on the housing and respectively face the magnetic field generating members and since the spindle device circumferentially disperses the which magnetic field generating members generate heat, the spindle device can prevent the spindle from being hot locally and further, since the surface area of the magnetic field generating members on the spindle are made larger, they can be cooled more effectively than one line of magnetic field generating members.

Abstract: A throttle body assembly including an end plate. The throttle body assembly includes a housing having an inner wall, and a motor located within the housing. The motor end plate is coupled to the motor and is in contact with the inner wall of the housing. The end plate includes an outer edge having at least one protrusion extending therefrom. The contact between the end plate and the housing is substantially only between the at least one protrusion on the outer edge of the end plate and the inner wall of the housing.

Abstract: A rotor of an outer rotor type motor is coupled to an outside of a stator, and is provided with a shaft coupler, for being connected with a shaft of a drum, fixed at its center portion by an injected material, and a plurality of radiation holes formed therein continuously in a radial direction. The rotor includes at least one cooling fin provided with a base member fixed to a bottom surface of the rotor and a curved member attached to the base member, wherein the cooling fin is combined with the bottom surface so as to be disposed adjacent to the radiation hole. Therefore, a contact area with air can be increased, and an air circulation through the radiation holes can be facilitated. Accordingly, deterioration of the efficiency of a washing machine is prevented despite long periods of operation, and any damage caused by overheating is prevented.

Abstract: Spindle-motor stator includes at least a first core sheet and at least one or more second core sheets located next to an end core sheet. A bent portion bent upward and a protrusion extending upward from the bent portion are formed at the forward end of the plurality of the first core sheet. Each of the plurality of teeth is wound with a conductive wire.

Abstract: A drive motor is supported and fixed onto a motor support plate composing a support member through vibration proof rubber which damps vibration, the frequency of which is not less than 1 kHz. Due to the foregoing, it becomes difficult for the vibration generated from the drive motor itself, to be transmitted to the support member so that the generation of resonance noise can be prevented.

Abstract: A stepping motor comprises a stator core, a drive coil which is attached to the stator core and a terminal block having a plurality of terminal pins to be wound with the terminals of the drive coil windings. The stator core and terminal block have respective fitting parts. The fitting part of the terminal block is fitted to the fitting part of the stator core. A gap is provided between the terminal block and the drive coil.

Abstract: An outer rotor type multi-pole generator includes a stator mounted on a stationary support, and a rotor formed by fixedly attaching a magnet to the inner periphery of a bottomed cylindrical rotor yoke that is coaxially fixed to an end of a drive shaft rotatably supported by the support and that coaxially covers the stator. A plurality of radially extending vanes are integrally provided in a closed end of the rotor yoke, and a plurality of intake holes positioned between the vanes are formed in the closed end of the rotor yoke. It is thereby possible to reduce the number of components and improve the efficiency of assembly operations, and to set the overall axial length of the generator at a relatively small value while avoiding any reduction in the rigidity with which the rotor is supported.

Abstract: In a spindle motor in which teeth portions of a stator core formed by laminating magnetic plates are bent in order to increase the number of turns of the stator windings, a gap in the teeth portions between the magnetic plates is avoided and a precise attractive force adjustment becomes possible. The stator core is bent such that its teeth portions faces a surface of a rotor magnet at right angles, and the teeth portions and salient pole arm portions around which windings are wound are substantially parallel to each other. The salient pole arm portions locate approximately halfway between a lower surface of a hub and an upper surface of a base. Further, a thickness of a magnetic plate is set to be 0.5 to 0.9 times that of other portions.

Abstract: A compacted magnetic powder metal component stator for use in an electrical machine is provided. Each stator is comprised of a plurality of stator core assemblies. Each stator core assembly forms an arcuate section of the stator core itself. Each stator core assembly is comprised of an inner shoe component, with winding guides supporting a winding, and at least one back piece and two end caps fitted to the winding on the outer radial edge of the stator assembly.

Abstract: A stator adapted for driving rotation of a rotor includes a stator body having a surrounding wall surface that surrounds a stator axis. A plurality of magnetic pole protrusions protrude radially from the surrounding wall surface relative to the stator axis, and a plurality of stator coils are respectively wound around the magnetic pole protrusions. A signal transmission unit is electrically coupled to the stator coils. Each of the magnetic pole protrusions has an outer periphery, and a recess formed inwardly from the outer periphery. Each of the stator coils has an inner conducting end that is accessible from the corresponding recess, thereby facilitating coupling of the inner conducting end to the signal transmission unit, and an outer conducting end electrically coupled to the signal transmission unit.

Abstract: A stepping motor includes a hollow cylindrical fixed yoke; a magnet disposed coaxially with the fixed yoke and divided into sections in the circumferential direction, the sections being alternately magnetized; a first coil and a second coil coaxially fixed to the fixed yoke; a first rotational yoke facing a magnetized surface of the magnet and excited by the first coil; a second rotational yoke facing the magnetized surface of the magnet and excited by the second coil; and bearing units formed in bobbins for supporting a rotor including the first rotational yoke, a connecting member, and the second rotational yoke such that the rotor is rotatable with respect to the fixed yoke.