Patent ID: 8253287

Claim:
An automotive dynamoelectric machine comprising: a housing that is constituted by a front bracket and a rear bracket; a rotor that is rotatably disposed inside said housing by being fixed to a shaft that is rotatably supported by said front bracket and said rear bracket; a stator comprising: a cylindrical stator core that is disposed so as to be held between said front bracket and said rear bracket so as to surround said rotor; and a stator winding that is mounted to said stator core; and an inverter power module that has an inverter power circuit that converts electric power bidirectionally between direct-current and alternating-current, wherein said inverter power module comprises: a heatsink that is shaped into a ring-shaped flat plate or a fan-shaped flat plate, and on a rear surface of which radiating fins are disposed so as to stand; a plurality of switching elements that are mounted onto a front surface of said heatsink with an electrically-insulating layer interposed; a circuit board that is a resin-molded body into which a plurality of inserted conductors are insert molded, that has a battery electric potential connecting terminal, a ground electric potential connecting terminal, a stator winding connecting terminal, and a signal wire connecting terminal that are constituted by exposed portions of said plurality of inserted conductors, that is disposed on a front surface side of said heatsink, and that connects said plurality of switching elements using said signal wire connecting terminal so as to constitute said inverter power circuit; and a bus bar that is fixed to said heatsink in an electrically-insulated state so as to be disposed on an opposite side of said circuit board facing said heatsink, and that is connected to a power source line of said inverter power circuit by means of said battery electric potential connecting terminal; wherein said heatsink is electrically connected to said rear bracket by being fixed to said rear bracket; and wherein said rear bracket is connected to a ground line of said inverter power circuit by means of said ground electric potential connecting terminal.