Abstract: There is provided a rotor for a rotary electrical machine for improving mechanical strength of the rotor against centrifugal force. The rotary electrical machine is provided with a stator, and a rotor disposed with a gap from the stator, which has a rotor core. The rotor includes a magnet insertion hole, and a permanent magnet inserted into the magnet insertion hole. A clearance part is formed at a position of the magnet insertion hole corresponding to a corner of the inserted permanent magnet, which has a facing surface that is formed to face a surface of the permanent magnet via a gap. The facing surface of the clearance part has inflection points so that each of obtuse angles is formed by the two facing surfaces contiguous with the inflection points.

Abstract: There is provided a rotor for a rotary electrical machine for improving mechanical strength of the rotor against centrifugal force. The rotary electrical machine is provided with a stator, and a rotor disposed with a gap from the stator, which has a rotor core. The rotor includes a magnet insertion hole, and a permanent magnet inserted into the magnet insertion hole. A clearance part is formed at a position of the magnet insertion hole corresponding to a corner of the inserted permanent magnet, which has a facing surface that is formed to face a surface of the permanent magnet via a gap. The facing surface of the clearance part has inflection points so that each of obtuse angles is formed by the two facing surfaces contiguous with the inflection points.

Abstract: A vehicle AC generator includes a stator having stator windings; front frame and rear frame, each rotatably supporting a rotor; a cooling fan fitted to the rotor; first polarity arm and second polarity arm configured to rectify currents of one polarity and another polarity, respectively; a rectifier device configured to rectify an alternating current generated in the stator windings; and a protective cover covering the rectifier device. The rectifier device includes a first heat dissipating plate having rectifier elements forming the first polarity arm, a second heat dissipating plate rectifier elements forming the second polarity arm, and a connection plate formed in waveform-like shape and disposed between the first and second heat dissipating plates, and a passage of a cooling air blown by the cooling fan formed between the first and second heat dissipating plates and between the second heat dissipating plate and the connection plate.

Abstract: An object is to provide a rotating electric machine offering a high output and high efficiency by balancing inductance of each phase even if a stator is used in which stator windings of different phases are disposed in a slot of a stator core in a three-phase winding. A stator 5 includes a stator core 6 having a plurality of slots arrayed circumferentially and opening to an inner peripheral surface and a stator winding 7 wound in each of the slots. The stator winding 7 is divided into at least two for each phase (7U-A, 7U-B, 7V-A, 7V-B, 7W-A, 7W-B). After insertion of the stator core 6, the stator winding of each phase is connected in parallel or in series. The stator winding of each phase is disposed in slots such that combined inductance of different phases is equalized.

Abstract: An electrical rotating machine which includes: a rotor; a stator provided with an armature winding, the rotor and the stator being housed in a housing space formed by a front bracket and a rear bracket; and a rear cover provided with a circumferential side wall and a bottom wall and disposed near the bottom of the rear bracket. The rear cover includes a plurality of engaging openings formed in the circumferential side wall of the rear cover, and steps of the engaging openings each produced by the difference between the diameter of the side wall on the bottom wall side and the diameter of the side wall on the end opening side. The bracket has engaging portions inserted into the corresponding steps for fixing the rear bracket.

Abstract: Vehicle AC generator comprises a stator comprising stator windings; front frame and rear frame, each rotatably supporting a rotor in the stator via a space on an inner circumference thereof; cooling fan fitted to the rotor; first polarity arm configured to rectify a current of one polarity; second polarity arm configured to rectify a current of another polarity; rectifier device configured to rectify an alternating current generated in stator windings; protective cover covering rectifier device. Rectifier device comprises first heat dissipating plate having rectifier elements forming first polarity arm, second heat dissipating plate rectifier elements forming second polarity arm, and connection plate formed in waveform-like shape and disposed between the first and second heat dissipating plates, and passage of a cooling air blown by the cooling fan formed between first heat dissipating plate and connection plate and between second heat dissipating plate and connection plate.

Abstract: An object is to provide a rotating electric machine offering a high output and high efficiency by balancing inductance of each phase even if a stator is used in which stator windings of different phases are disposed in a slot of a stator core in a three-phase winding. A stator 5 includes a stator core 6 having a plurality of slots arrayed circumferentially and opening to an inner peripheral surface and a stator winding 7 wound in each of the slots. The stator winding 7 is divided into at least two for each phase (7U-A, 7U-B, 7V-A, 7V-B, 7W-A, 7W-B). After insertion of the stator core 6, the stator winding of each phase is connected in parallel or in series. The stator winding of each phase is disposed in slots such that combined inductance of different phases is equalized.

Abstract: A direction in which cooling air generated by a cooling fan flows to be discharged is perpendicular or nearly perpendicular to a direction in which diffusers are inclined. Thus, airflow resistance is increased by the diffusers, and the cooling air cannot be efficiently discharged from discharge ports provided circumferentially in an outer peripheral portion of a housing. Further, a stator coil cannot be sufficiently cooled.

Abstract: A rotating electrical machine including a rotor in which a plurality of magnetic poles are provided in circumferential direction, and a stator within the rotor is disposed with a gap against the rotor, wherein: coil groups are received in a slot between two teeth of the stator core; each of the teeth has a tooth main body and two tooth tip edge portions, and the tooth main body and the tooth tip edge portions are connected by connecting portions, with slits being formed in the coil sides of the connecting portions; and the slits extend from opening portions towards the centers of the tooth tip edge portions in circumferential direction, and are formed so that their tooth main body sides and their tip edge portion sides, that together define the opening portions of the slits, contact one another; with the gaps between adjacent ones of the tooth tip edge portions in circumferential direction being smaller than a width of the slot.

Abstract: A direction in which cooling air generated by a cooling fan flows to be discharged is perpendicular or nearly perpendicular to a direction in which diffusers are inclined. Thus, airflow resistance is increased by the diffusers, and the cooling air cannot be efficiently discharged from discharge ports provided circumferentially in an outer peripheral portion of a housing. Further, a stator coil cannot be sufficiently cooled.

Abstract: A rotating electrical machine main body 40 includes a rotor 4 having a fan, a stator 1, and housings 2, 3. An inverter unit 30 includes a case 14 and a plurality of switching semiconductor devices 15. The rotating electrical machine main body 40 and the inverter unit 30 are coupled with each other when the case 14 is connected to the housing 3. A cooling air circulated by rotation of a fan 12a cools the inverter unit 30 before flowing into the housing. Part of the case 14 is disposed between the rotating electrical machine main body 40 and the switching semiconductor devices 15, preventing thermal radiation radiated (or irradiated) from the rotating electrical machine main body 40 from reaching the switching semiconductor devices 15.

Abstract: A rotating electric machine includes a stator 1 and a rotor 6. The stator 1 includes an annular stator core 5 and a stator winding 3 that is a star connection of flat wire coils. Lead wires 3U-IB, 3U-IIB, . . . of the stator winding 3 extend from other coil ends substantially in parallel with an axial direction of the rotating electric machine. A neutral conductor connection device 100 has a neutral point connection bus bar 101 formed of a conductive plate. The neutral conductor connection device 100 connects between lead wires forming neutral conductors of the star connection.

Abstract: To provide an electric machine capable of being improved in both fabricability and reliability, and a process for manufacturing the machine.

Abstract: A synchronous motor with low vibrations and an electric driving system using the motor. A field-coil synchronous motor comprises a stator and a rotor rotatably supported at the inner peripheral side of the stator with a gap left relative to the stator. The stator has a stator coil supplied with electric power while being controlled such that driving torque is reduced as a rotation speed of the rotor increases, and the rotor has a field coil supplied with a field current while being controlled such that the field current is reduced as the rotation speed of the rotor increases. The rotor is a tandem claw-pole rotor comprising plural pairs of N- and S-claw poles disposed side by side in an axial direction, and the plural pairs of claw poles of said tandem claw-pole rotor are relatively shifted from each other in a circumferential direction.