Electronically commutated motor controller for power assisted steering of motor vehicle, delivers square digital signals in quadrature, and another digital signal in pulse form per revolution of encoder to control motor current

摘要

A fixed sensor (6) has sensing elements arranged opposite to main and commutation tracks of a circular multipole encoder (4) for delivering square digital signals (A,B) in quadrature and a digital signal (C) in the form of 2 asterisk P asterisk N pulses per revolution of the encoder. A control circuit (8) controls commutation of current in phase windings of a motor (1) connected to the encoder based on the signals (A-C). Independent claims are also included for the following: (1) electronically commutated motor control method; and (2) anti-friction bearing.