Patent ID: 8659194

Claim:
A motor drive apparatus comprising: a motor; and an ECU provided on an axially one-end side of the motor and configured to perform a drive control of the motor, the ECU including an ECU housing whose one-end side is open, the ECU housing including a heat sink located at an inner portion of the ECU housing, the heat sink including a module receiving portion, the module receiving portion including a heat-receiving surface, and an opening portion open to the one-end side of the ECU housing, a control substrate received by the ECU housing to be substantially perpendicular to the heat-receiving surface and to face the motor, a plurality of semiconductor modules each inserted through the opening portion and received in the module receiving portion, wherein each of the plurality of semiconductor modules is connected electrically with the control substrate to control a power supply of the motor, wherein each of the plurality of semiconductor modules includes a heat-radiating surface at an outer portion thereof, and a module retaining section pressing the heat-radiating surface to the heat-receiving surface to retain each of the plurality of semiconductor modules in the module receiving portion.