Electric drive apparatus

摘要

Two power modules, in which switching elements for switching over currents supplied to coils of a motor are resin-molded, are provided to face each other sandwiching a plane including a rotation axis of a shaft. A first smoothing capacitor, second smoothing capacitors and a choke coil are located between the power modules. By consolidating large-sized electronic parts between the power modules, a control unit can be reduced in size and impedance of electric conductor connecting the electronic parts and the power modules can be reduced.

主权项

1. An electric drive apparatus comprising:
a motor having a motor case formed in a cylindrical shape, a stator located radially inside the motor case and coils wound to provide a plurality of phases, a rotor located radially inside the stator and rotatable relative to the stator, and a shaft rotatable together with the rotor; a plurality of power modules located to sandwich a plane including a rotation axis of the shaft therebetween at one axial end side of the shaft, each of the power modules including switching elements for switching over a current supplied to the coils, a mold part for molding the switching elements therein and terminals protruding from the mold part, a first smoothing capacitor, electrically connected to a power circuit connector side to supply current to the switching elements from a power source, for reducing power source noise; a choke coil, electrically connected in series between the power source and the switching elements, for attenuating variation in power supplied to the switching elements; and a second smoothing capacitor, electrically connected to the switching elements in parallel, for absorbing ripple current generated when current supply to the switching elements is switched over, wherein at least one of the first smoothing capacitor, the second smoothing capacitor and the choke coil is located between the power modules.