Patent ID: 9742327
Date: 2017-08-22
CPC Classifications: H02K,H02P

Claim:
1. A motor drive controller comprising: a motor driver that applies a voltage to each phase of a motor to rotate; a rotational position detector that detects rotational position of the motor and generates rotational position information indicating the rotational position; and a processor that outputs, to the motor driver, driving control signals for repeatedly adjusting an advance angle and a lag angle at energization switching of the each phase of the motor in a prescribed pattern based on the rotational position information generated by the rotational position detector, wherein the processor repeatedly adjusts the advance angle and the lag angle at energization switching in a prescribed pattern while the motor is rotating at a rotation speed that is within a prescribed rotation speed range, wherein the prescribed rotation speed range includes a range where a nth-order component corresponding to a n-number of times of the energization switching per rotation of the rotor is resonant with a natural resonance frequency of the motor, and wherein the processor increases an (n/2)th-order component of a supply current and decreases the nth-order component of the supply current.