Patent ID: 7843159
Filing Date: 2010-11-30
Classification: H02P

Abstract:
1. A motor controller, comprising a control system that feedback-controls a moving operation of a moving section provided in a motor through the use of a detected moving amount of the moving section, the motor controller comprising: a notch filter which is arranged inside the control system and attenuates a signal component of a nearby frequency in accordance with a notch width with a notch frequency put at a center in an input signal; an oscillation frequency estimating section which estimates an oscillation frequency component in the motor from the moving amount; and a notch control section which controls the notch filter so as to change the notch frequency and the notch width in accordance with an estimation result of the oscillation frequency estimating section, wherein, when determining that the oscillation frequency estimated by the oscillation frequency estimating section differs from the notch frequency set in the notch filter, the notch control section changes a frequency between the oscillation frequency and the notch frequency set in the notch filter as a new notch frequency of the notch filter, while changing the notch width to a new notch width such that the notch width becomes larger after the change than before the change.