PHASE ADVANCE ANGLE OPTIMIZATION FOR BRUSHLESS MOTOR CONTROL

摘要

A control system for a multiphase permanent magnet motor having a controller for producing a control signal to energize each phase winding. The controlle r includes a current value calculator for determining a value of phase current advanced in phase with respect to back-EMF by a phase advance angle, and a phase advance optimization circuit for producing a value of the phase advanc e angle optimized so as to maximize output torque of the motor and mimimize th e phase current. The phase advance optimization circuit determines the phase advance angle optimized for each phase of the motor.