An alternating current generator has a cooling function for a vehicle and includes a front bracket and a rear bracket with annular recessed portions that form a peripheral cooling chamber. A cooling cover is provided on the rear bracket. The cooling cover and the rear bracket form a rear cooling chamber. The peripheral cooling chamber and the rear cooling chamber are connected together through a connecting hole provided in the rear bracket. The front and rear brackets also form a parts housing chamber for receiving electric parts. The parts housing chamber is isolated from the peripheral and rear cooling chambers so as not to accommodate the fluid.
A rotary electric machine includes a rotor for rotation around a rotational axis, a stator core that has a cylindrical shape and includes a slot therein, a cooling unit having a coolant passage, and a casing that accommodates the rotor and the stator core. A stator coil is inserted in the slot of the stator core and has a coil end protruded from a side face of the stator core. An electric part is mounted on the cooling unit and controls a current of the stator core. The rotor is rotatably supported inside of the stator core. The cooling unit cools both the stator core and the electric part. The cooling portion is accommodated in spacing defined by the side face of the stator core and an outer circumference wall of the coil end.
An alternator for use in an automobile includes brackets for supporting a rotation shaft at both sides of a rotor, being thermally connected to a stator for supporting the stator, while one side of the rotor is closed by a bracket. A cooling water passage is provided in the bracket, a cooling fan is provided on the closed side of the rotor, and a cooling fin provided opposing to the cooling fan and in vicinity of the cooling water passage, thereby enabling cool down of the stator and the rotor, effectively, with low noises, and thereby obtaining a high power output.
In a rotary electric machine, a stator coolant passage means including a stator coolant tube and a damping member is provided between the inner periphery of a front housing and a stator core to surround the stator core. Since the stator core is cooled by coolant flowing in the stator coolant tube, heat transmission from the stator core to the damping member is decreased. Thus, the damping member is restricted from deteriorating due to high temperature. Further, an additional coolant tube is provided separately from the stator coolant passage means to cool heat-generating bodies such as a commutating device and a voltage generator. The coolant flows in the stator coolant tube prior to the additional coolant tube so that the coolant flowing in the stator coolant tube is not thermally affected by the coolant flowing in the additional coolant tube.
An ac generator for a vehicle includes a rotor having a field coil, a stator having a stator winding disposed around the rotor to provide ac power in cooperation with the rotor, a brush unit disposed near a rotation axis of the rotor, and a voltage regulator for controlling output voltage of the ac power. The voltage regulator has a regulator circuit section and a heat sink for dissipating heat generated by the regulator circuit section. The heat sink has a plurality of axially projecting cooling fins that extends in a circumferential direction of the rotor.
A drive system for a transportation device having an electric machine. The electric machine has a converter unit and a cooling unit with the converter unit being embodied at least partially in the shape of a ring and surrounding the electric machine or components of the electric machine.
