Patent ID: 8975849
Filing Date: 2015-03-10
Classification: G05D,H02P

Abstract:
1. A motor control apparatus in which feedback control is performed on a motor speed or its load, comprising: a first notch filter operable on a notch center frequency and a notch depth set therein which are both automatically changeable to attenuate an oscillation component on a motor speed control signal; an oscillation extracting filter that extracts, from a motor speed signal, the oscillation component and outputs an extracted oscillation signal representing the oscillation component; a second notch filter operable on a notch center frequency set therein which is automatically changeable to attenuate the extracted oscillation signal from the oscillation extracting filter; a notch control portion responsive to the extracted oscillation signal directly from the oscillation extracting filter and the filtered extracted oscillation signal from the second notch filter to automatically change the notch center frequency of the first notch filter and the notch center frequency of the second notch filter in agreement with a frequency of the extracted oscillation signal; a notch depth control portion responsive to the extracted oscillation signal directly from the oscillation extracting filter to automatically change the notch depth of the first notch filter; and a control determining portion that, based on amplitudes of the extracted oscillation signal directly from the oscillation extracting filter and the filtered extracted oscillation signal from the second notch filter, selectively operates mutually exclusive one of the notch control portion or the notch depth control portion in such a manner as to provide the extracted oscillation signal directly from the oscillation extracting filter solely to the selected mutually exclusive one thereof.