Patent ID: 7772797
Filing Date: 2010-08-10
Classification: H02M,H02P

Abstract:
1. A controller for a motor, having a drive signal generator for generating a drive signal for an inverter, the inverter for turning on or off a switching element in accordance with the drive signal, comprising: a current detecting section for detecting a current value of a drive current of the motor; an offset amount calculating section for calculating an offset amount in terms of a real direct current amount of the drive current based on a plurality of equidistant samples of the current value detected within a full rotation cycle of a rotor of 0 to 2π radians when the motor is being driven, the drive current including positive and negative peak values that are asymmetrical about a zero level, and the samples including non-peak values, wherein the offset amount is an average value in one cycle of the drive current that has a positive peak and a negative peak about the zero level; and a drive signal correcting section for correcting the drive signal based on the calculated real direct current amount.