Patent ID: 8723470
Filing Date: 2014-05-13
Classification: H02K,H02P

Abstract:
1. A method of monitoring a motor having a stator, a rotor and a detector, the stator being operable to receive a driving signal to produce a first magnetic field, the rotor being operable to rotate in a circle, the rotor having a magnetic portion operable to emit a second magnetic field in a radial direction, the detector being operable to output a detection signal based on the position of the rotor, said method comprising: driving the motor with the driving signal such that the driving signal has a first amplitude; monitoring the detection signal; determining a first rotor angle θ driving the motor with the driving signal such that the driving signal has a second amplitude; monitoring the detection signal; determining a second rotor angle θ determining the alignment of the detector relative to the stator based on the first rotor angle θ