Patent ID: 8436573

Claim:
A power conversion device for a multiphase rotating electric machine including a first and a second sets of windings, each set being formed by windings corresponding to each phase of the rotating electric machine of an electric power steering apparatus that imparts assist torque to a steering member, the power conversion device comprising: a first and a second inverter circuits provided for the first and the second sets of windings, respectively, each inverter circuit having switching elements corresponding to each phase of each set of windings; a capacitor connected to the first and the second inverter circuits; and a control circuit that controls on/off of the switching elements based on a first voltage command signal related to a first voltage applied to the first set of windings and a second voltage command signal related to a second voltage applied to the second set of windings, wherein the control circuit switches a control operation between a first state and a second state according to a steering state of the steering member, the first state corresponding to a case where a center value of the first voltage command signal is shifted to be lower than an output center value that is a center value of a possible duty range and a center value of the second voltage command signal is shifted to be higher than the output center value, and the second state corresponding to a case where the center value of the first voltage command signal is shifted to be higher than the output center value and the center value of the second voltage command signal is shifted to be lower than the output center value.