Patent ID: 7852027
Filing Date: 2010-12-14
Classification: H02P

Abstract:
1. A method for testing a motor having a rotor and a winding, comprising steps of: (a) providing a current to the winding to rotate the rotor; (b) stopping the current while a rotating speed of the rotor reaches a predetermined speed; (c) measuring a terminal voltage of the winding while no current is within the winding; (d) obtaining a compensated back electromotive force of the winding by compensating the terminal voltage with a performance of the rotor, wherein the performance includes an instantaneous period and a rotating speed of the rotor, and the step (d) is performed by computing the instantaneous period and the rotating speed of the rotor and then modifying the terminal voltage to a target rotating speed to thereby obtain the compensated back electromotive force due to a reduction of the rotating speed; (e) comparing the characteristic of the compensated back electromotive force with a predetermined parameter to understand a magnetization of the motor.