Patent ID: 8912742
Filing Date: 2014-12-16
Classification: H02P

Abstract:
1. A control device for a rotating electric machine having a three-phase coil, comprising: a detection unit for detecting a rotation speed of said rotating electric machine; a determination unit for determining a diffusion width of a carrier frequency based on the rotation speed of said rotating electric machine detected by said detection unit such that a plurality of sideband wave components occurring centered on the carrier frequency while said rotating electric machine is driven are not superimposed on one another, said determination unit determining said diffusion width such that, when the rotation speed of said rotating electric machine is a first rotation speed, said diffusion width is larger than said diffusion width when the rotation speed is a second rotation speed which is lower than said first rotation speed; a carrier generation unit for changing the carrier frequency within a range of said diffusion width determined by said determination unit to generate a carrier signal; and a pulse width modulation unit for executing pulse width modulation based on a command voltage and said carrier signal to generate a pulse signal for driving said rotating electric machine.