Patent ID: 8198852
Filing Date: 2012-06-12
Classification: H02P

Abstract:
1. A drive control circuit driving and controlling a polyphase motor, comprising: a current control circuit configured to generate current control signals based on current command values, each current command value being a target value of amplitude of each of armature currents passing through said polyphase motor, and output said current control signals corresponding to respective phases of said polyphase motor; an amplitude adjusting circuit configured to receive said current control signals output from said current control circuit, adjust amplitude of said current control signals for reducing variation in the amplitude among said armature currents of respective phases and, output the adjusted current control signals corresponding to respective phases of said polyphase motor; and a drive circuit configured to output, in response to the adjusted current control signals from said amplitude adjusting circuit, said armature currents passing through respective phases of said polyphase motor, wherein the amplitude adjusting circuit includes gain-variable amplifiers for said respective current control signals to adjust gain of each amplifier to reduce variation in the amplitude among said armature currents of the respective phases.