| 摘要 |
<P>PROBLEM TO BE SOLVED: To make it possible to supplement the number of pulses of a ripple component that is not extracted when an extraction circuit such as a switched capacitor filter does nor correctly extract the ripple component due to variations and the like in the power source voltage of a motor. <P>SOLUTION: A motor controller 1 includes: a motor 2; an extraction circuit for converting the ripple component of the current signal of the motor 2 into a pulse signal; an A/D converter 7 for detecting the voltage of the motor 2; and a controller 4 for inputting a pulse signal. When the controller 4 detects a variation of voltage detected by the A/D converter 7, the controller 4 calculates an average period T_average of a pulse period T_before for one pulse or a plurality of pulses just before the voltage variation and a pulse period T_after for one pulse or a plurality of pulses after passing a predetermined period t from the voltage variation and calculates a quotient n obtained by dividing the predetermined period t by the average period T_average. <P>COPYRIGHT: (C)2013,JPO&INPIT |
