Patent ID: 7960880

Claim:
An automotive electric motor-generator comprising: a motor comprising: a rotor that is rotatably disposed inside a housing; a stator that is disposed so as to surround a radially-outer side of said rotor; and at least one fan that is fixed to an axial end surface of said rotor, said motor functioning as a generator and as an electric motor; and a power semiconductor apparatus that controls a current that is supplied to said motor, wherein said power semiconductor apparatus comprises: a fan-shaped first radiating plate on which a first switching element that is constituted by an N-channel semiconductor element is mounted, and that has a drain potential for said first switching element; a fan-shaped second radiating plate on which a second switching element that is constituted by an N-channel semiconductor element is mounted, and that has a drain potential for said second switching element; a fan-shaped first circuit board in which a first electrode member that connects said first switching element and said second switching element electrically in parallel is insert molded into a first insulating resin; and a fan-shaped second circuit board in which a second electrode member that is electrically connected to a source terminal of said second switching element and that has negative potential is insert molded into a second insulating resin; wherein said first radiating plate, said second radiating plate, said first circuit board, and said second circuit board are disposed in a fan shape that is centered around a shaft of said rotor so as to be radially adjacent and line up concentrically in a plane that is perpendicular to said shaft outside one axial end of said housing.