Patent ID: 9166517
Filing Date: 2015-10-20
Classification: H02P

Abstract:
1. A motor controller configured to receive a PWM command signal formed of a pulse-width modulated rotation speed command, and control a motor to rotate at a speed corresponding to the rotation speed command, the motor controller comprising: a PWM demodulation processor for demodulating the PWM command signal and restoring the rotation speed command as a speed command value; a rotation control section for generating a drive value of the motor according to the speed command value; a power drive section for generating a driving voltage to energize and drive a winding of the motor based on the drive value; an information signal generator for generating an information signal to be input to a PWM modulation processor; and the PWM modulation processor for generating a PWM information signal that is pulse-width modulated by the information signal, wherein the PWM modulation processor generates and outputs the PWM information signal synchronized with the PWM command signal; and the PWM demodulation processor comprises: an edge timing detector for detecting timing of edges included in the PWM command signal that change into a given direction; and an edge-cycle detecting section for detecting a cyclic period of the edges, and the PWM modulation processor comprises: a pulse-width calculating section for calculating a pulse width of the PWM information signal based on the information signal and the cyclic period of the edges detected by the edge cycle detecting section; and a PWM information signal generator for generating and outputting the PWM information signal based on the pulse width calculated by the pulse-width calculating section and the timing detected by the edge timing detector.