Patent ID: 8304942
Filing Date: 2012-11-06
Classification: H02K

Abstract:
1. A drive apparatus comprising: a motor, which has a cylindrical motor case, a stator, a rotor and a shaft, the stator being arranged radially inside the motor case and wound with coils of a plurality of phases, the rotor being arranged radially inside the stator, and the shaft being rotatable with the rotor; and an electronic circuit, which has a semiconductor module, a capacitor and a choke coil, the semiconductor module being arranged in a central axis direction of the shaft relative to the motor case and configured to switch over coil currents flowing in the coils of the plurality of phases, the capacitor being connected in parallel to a power line and a ground line of the semiconductor module, and the choke coil provided in the power line of the semiconductor module, wherein the choke coil has a hole in a central part thereof and is arranged with an axial end of the shaft passing therethrough, the axial end being opposite to another axial end of the shaft, from which rotary torque of the motor is output to an external side of the motor, and wherein the capacitor is arranged radially inside the heat sink to face the semiconductor module through the heat sink in a radial direction of the shaft.