Abstract: A motor includes a stator including a core back having a circular or substantially circular shape, a plurality of tooth portions extending radially inwardly from the core back, a plurality of insulators covering the tooth portions, a plurality of coils formed by winding wires around the tooth portions via the insulators. The motor also includes a bus bar arranged axially above the stator. The bus bar supports a first conductor plate having a plurality of first terminals to which first end portions of the wires from each phases of the coils are connected. The insulators include a guiding groove and support therein the second conductor plate to which second end portions of the wires are connected. Through the second conductor plate, the second end portions of the wires are connected to the neutral point.

Abstract: A busbar unit for attachment to on an electric-motor armature is furnished with: busbars having terminals for supplying drive current to the armature; a plurality of connecting pins each of approximately J-shaped metal; a busbar holder retaining the busbars and the connecting pins; and a circuit board disposed on the upper side of the busbar holder, and in which a sealant injection port and an air-bleeding hole are formed.

Abstract: A motor includes a sensor which magnetically detects an angular position centered about a central axis of a rotor core with respect to an armature. The sensor preferably includes a yoke which has a substantially annular shape, is made of a magnetic material, is arranged substantially perpendicularly to the central axis and is affixed to a shaft, a sensor magnet affixed at the yoke, a magnet cover which covers a surface of the sensor magnet other than a portion in contact with the yoke, a first Hall element and a second Hall element both of which are arranged facing in an axial direction a surface of the sensor magnet opposite from a surface thereof at which the yoke is arranged. Since the sensor magnet is covered by the yoke and the magnet cover, even when the sensor magnet is damaged, the damaged sensor magnet is prevented from damaging other components of the motor. By virtue of such configuration, the reliability of the motor is improved.

Abstract: In a motor, an sensor magnet is attached to a shaft and three Hall sensors for detecting the position of the sensor magnet are mounted on a circuit board. By using neodymium-iron-boron base rare earth magnet having radial anisotropy as a sensor magnet, the detection accuracy for the position of a field magnet via the sensor magnet by the Hall sensor can be improved.

Abstract: A busbar unit includes a busbar holder and a plurality of busbars. The busbar holder has a first surface and a second surface on both sides in an axial direction, respectively. The first surface is provided with grooves in which one or more busbars are accommodated. The busbar in the groove of the first surface is provided with a wire connector portion on the first surface. The second surface is also provided with grooves accommodating remaining busbar(s) therein. The busbar(s) in the groove of the second surface is provided with a wire connector portion on the second surface. To each wire connector portion, a conductive wire forming a coil winding of an armature of a motor is connected.

Abstract: A second bracket part for holding a resolver stator of a resolver as position detecting means is inserted in an opening hole in a first bracket part. An expanded part formed in the second bracket part and the opening hole in the first bracket hole are connected to each other with a fixing member. A through hole in which the fixing member for the expanded part is inserted has a circular arc shape. By reducing the fixing strength of the fixing member, the second bracket part can be made movable in the circumferential direction.

Abstract: A resolver rotor for a variable reluctance resolver includes a plurality of axially stacked rotor pieces. The rotor pieces are jointly fitted into one body. In the fitting of the rotor pieces, deformed portions are provided between a center of the radial thickness of the resolver rotor and a side surface thereof which is opposite to a stator-side surface thereof. The number of deformed portions is the same as that of projecting poles of the resolver rotor. The deformed portions are arranged at circumferential positions of peaks of the respective projecting poles. At those positions, concave portions are provided on the side surface to receive deformations caused by fitting the rotor pieces together. Thus, the stator-side surface of the resolver rotor is less affected by fitting of the rotor pieces together, preventing a reduction in the detection accuracy of the resolver.

Abstract: A busbar unit includes a busbar holder and a plurality of busbars. The busbar holder has a first surface and a second surface on both sides in an axial direction, respectively. The first surface is provided with grooves in which one or more busbars are accommodated. The busbar in the groove of the first surface is provided with a wire connector portion on the first surface. The second surface is also provided with grooves accommodating remaining busbar (s) therein. The busbar (s) in the groove of the second surface is provided with a wire connector portion on the second surface. To each wire connector portion, a conductive wire forming a coil winding of an armature of a motor is connected.

Abstract: A motor includes a housing having a substantially cylindrical shape accommodating therein a stator portion and a rotor portion. The housing includes a housing body having an opening at an upper side thereof, and a lid portion arranged between an armature and a sensor so as to close the opening of the housing body. Since the lid portion is made of a magnetic material and is arranged between the armature and the sensor, a magnetic effect on the sensor caused by a magnetic force generated at the armature is minimized. By virtue of such configuration in which the lid portion of the housing functions as a magnetic shield, the motor can be smaller in the axial direction compared with a configuration in which an extra layer of magnetic shield is arranged.

Abstract: A motor having a busbar unit which is accommodated in a housing along with an armature includes a relay wherein the connection between the armature and the relay is secured. By virtue of such a configuration, reliability of the connection between the armature and the relay is improved. In the busbar unit, a plurality of first busbars and a plurality of second busbars each having a substantially arcuate shape are arranged so as to be circumferentially spaced apart from one another. The first busbars do not overlap with the second busbars in the axial and radial directions thereby reducing the dimensions of the motor in the axial and radial directions.

Abstract: A motor includes a sensor which magnetically detects an angular position centered about a central axis of a rotor core with respect to an armature. The sensor preferably includes a yoke which has a substantially annular shape, is made of a magnetic material, is arranged substantially perpendicularly to the central axis and is affixed to a shaft, a sensor magnet affixed at the yoke, a magnet cover which covers a surface of the sensor magnet other than a portion in contact with the yoke, a first Hall element and a second Hall element both of which are arranged facing in an axial direction a surface of the sensor magnet opposite from a surface thereof at which the yoke is arranged. Since the sensor magnet is covered by the yoke and the magnet cover, even when the sensor magnet is damaged, the damaged sensor magnet is prevented from damaging other components of the motor. By virtue of such configuration, the reliability of the motor is improved.

Abstract: An insulator is arranged to cover a resolver stator core and includes a cover portion arranged to cover a core back portion and a tooth cover portion for covering a corresponding tooth. In the cover portion, a bridge pin is disposed to project axially upward. After a conductive wire is wound around a tooth, and hooked on the bridge pin, the conductive wire is wound around another tooth. In the case where the insulator is formed by injection molding, an injection gate scar portion is formed on a top surface of the bridge pin, at a position radially outside a crossover portion of the conductive wire, on a top surface of an inner wall of the tooth cover portion, or on a back surface of the insulator.

Abstract: In a resolver of a motor, a plurality of wires forming a plurality of coils arranged at a resolver stator portion are arranged at a wiring surface which is arranged at a terminal block of a connector portion and extends between an annular shape surface arranged substantially perpendicularly to a central axis at a core back of an insulator and a plurality of terminal pins, and are connected to a control unit via the terminal pins. Each of the wires of the resolver includes a slackened portion formed at a portion thereof between corresponding terminal pins and corresponding coils. The slackened portion is accommodated in a groove portion arranged at the wiring surface of the connector portion in order to minimize the possibility of damaging the wire improving reliability of the connection between the terminal pin and the coil.

Abstract: A resolver includes a terminal block having a plurality of terminals integrally formed therein. Each of the terminals has a conductive wire connecting portion arranged to allow a conductive wire of a resolver stator to be fixed thereto and a lead wire connecting portion which allows a lead wire to be connected thereto. Ultrasonic welding is carried out to join the lead wire connecting portion and a connecting end of the lead wire.

Abstract: Small brushless motor having high output and small torque ripple. The brushless motor includes induction voltage adjusting means. With this, induction voltage of each phase of the stator is adjusted into a flatly spread waveform having no abrupt variation where odd-numbered of order harmonic is superposed, thereby obtaining a small motor having high output capable of efficiently generating large torque with small ripple.

Abstract: A connector portion of a resolver stator includes a connecting portion to which a lead wire is connected and a guiding groove which guides the lead wire in an axial direction. The lead wire connected to the connecting portion is retained by the guiding groove and guided in the axial direction.

Abstract: A brushless motor includes at a substantially cylindrical portion of a bracket thereof a retaining mechanism which retains a resolver stator. The resolver stator whose axial movement and circumferential movement are minimized by the retaining mechanism will be affixed to the bracket.

Abstract: A motor includes a stator including a core back having a circular or substantially circular shape, a plurality of tooth portions extending radially inwardly from the core back, a plurality of insulators covering the tooth portions, a plurality of coils formed by winding wires around the tooth portions via the insulators. The motor also includes a bus bar arranged axially above the stator. The bus bar supports a first conductor plate having a plurality of first terminals to which first end portions of the wires from each phases of the coils are connected. The insulators include a guiding groove and support therein the second conductor plate to which second end portions of the wires are connected. Through the second conductor plate, the second end portions of the wires are connected to the neutral point.

Abstract: A motor includes a stator and a bus bar supported axially above the stator. The bus bar includes a concave portion arranged in a lower surface thereof facing toward coils of the stator. In a gap defined between the coil and the concave portion, a portion of the wire extracted from the coil and wound in the circumferential direction (i.e., a crossover wire portion) is accommodated. The bus bar includes a wire-positioning hole through which the wire is led to a terminal to be connected with the wire.

Abstract: A busbar unit for attachment to on an electric-motor armature is furnished with: busbars having terminals for supplying drive current to the armature; a plurality of connecting pins each of approximately J-shaped metal; a busbar holder retaining the busbars and the connecting pins; and a circuit board disposed on the upper side of the busbar holder, and in which a sealant injection port and an air-bleeding hole are formed.