Patent ID: 8378605
Filing Date: 2013-02-19
Classification: F04B,H02P

Abstract:
1. Method for monitoring a multiphase alternating current permanent magnet synchronous electric motor mechanically coupled to an actuator to transfer torque thereto, comprising: controlling operation of the electric motor with a sensorless electric motor drive control system; estimating an initial phase angle and a rotational speed of a rotor of the electric motor; monitoring operation of the sensorless electric motor drive control system and the electric motor using the estimated initial phase angle and the estimated rotational speed of the rotor of the electric motor, comprising: detecting a stall condition associated with the electric motor comprising detecting the estimated rotational speed of the rotor is less than the stall speed threshold; and detecting a fault in one of the sensorless electric motor drive control system and the electric motor based upon the monitored operation.