Abstract: An electrical rotating machine includes a housing which has a bearing mounted on a wall thereof. The housing also has a plurality of air inlets, a plurality of air outlets, and spokes. The spokes extend from the bearing in a radial direction of the housing to isolate the air inlets from each other in a circumferential direction of the housing. Each of the spokes is equipped with a heat sink exposed to a flow of cooling air entering the housing through the air inlet to dissipate heat, as transmitted to the spoke, thereby minimizing transfer of the heat to the bearing through the spokes.

Abstract: An AC generator for a vehicle includes a housing having an inlet and an outlet, a stator fixed to the housing, a rotor disposed inside of the stator, a cooling fan fixed to a rotor, one or more cooling fins disposed in an air flow passage of a cooling air, and a rectifying element for rectifying an AC voltage generated by a stator winding. A positive-side cooling fin has a plurality of tapered first and second cooling holes penetrating in a thickness direction and serves as the air flow passages of the cooling air. Tapering directions of tapered surfaces extending in the thickness direction of each cooling hole in at least one pair of adjacent first and second cooling holes are reversed in the thickness direction with respect to each other.

Abstract: An electrical rotating machine includes a housing which has a bearing mounted on a wall thereof. The housing also has a plurality of air inlets, a plurality of air outlets, and spokes. The spokes extend from the bearing in a radial direction of the housing to isolate the air inlets from each other in a circumferential direction of the housing. Each of the spokes is equipped with a heat sink exposed to a flow of cooling air entering the housing through the air inlet to dissipate heat, as transmitted to the spoke, thereby minimizing transfer of the heat to the bearing through the spokes.

Abstract: A rotor includes a rotating shaft and a pair of first and second pole cores fixed on the rotating shaft. Each of the first and second pole cores includes a plurality of magnetic pole claws each having a root portion and a distal end. Each of the magnetic pole claws are configured to have a constant circumferential width at the root portion and taper from the root portion to the distal end. The magnetic pole claws of the first pole core are arranged alternately with those of the second pole core in a circumferential direction of the rotating shaft. Further, at least part of the magnetic pole claws of the first and second pole cores each have at least one chamfered portion formed at a circumferential end of the root portion of the magnetic pole claw so as to extend parallel to an axial direction of the rotating shaft.

Abstract: An AC generator for a vehicle includes a housing having an inlet and an outlet, a stator fixed to the housing, a rotor disposed inside of the stator, a cooling fan fixed to a rotor, one or more cooling fins disposed in an air flow passage of a cooling air, and a rectifying element for rectifying an AC voltage generated by a stator winding. A positive-side cooling fin has a plurality of tapered first and second cooling holes penetrating in a thickness direction and serves as the air flow passages of the cooling air. Tapering directions of tapered surfaces extending in the thickness direction of each cooling hole in at least one pair of adjacent first and second cooling holes are reversed in the thickness direction with respect to each other.

Abstract: A rotor includes a rotating shaft and a pair of first and second pole cores fixed on the rotating shaft. Each of the first and second pole cores includes a plurality of magnetic pole claws each having a root portion and a distal end. Each of the magnetic pole claws are configured to have a constant circumferential width at the root portion and taper from the root portion to the distal end. The magnetic pole claws of the first pole core are arranged alternately with those of the second pole core in a circumferential direction of the rotating shaft. Further, at least part of the magnetic pole claws of the first and second pole cores each have at least one chamfered portion formed at a circumferential end of the root portion of the magnetic pole claw so as to extend parallel to an axial direction of the rotating shaft.