Excitation controller of brushless three phase motor in vehicle steering has target rotating speed calculating unit to control stalling of starting of PWM field of field circuit based on corrected rotating position signals of rotor

摘要

The device has a flash memory or electrically erasable PROM (76) to store rotating position of a rotor detected by Hall Effect units (71). A rotating position correction unit (75) corrects the rotating position signals according to the stored position. A target speed calculating unit (73) controls stalling of the starting of a pulse width modulation field of a field circuit based on the corrected signals. An independent claim is also included for a method to control excitation of a brushless motor.