| CPC H02P 6/182 (2013.01) | 20 Claims |
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1. A method of determining a position of a rotor of a brushless permanent magnet motor, the method comprising:
measuring instantaneous phase current flowing through a phase winding of the motor during excitation of the phase winding;
measuring voltage applied to the phase winding of the motor during excitation of the phase winding;
calculating a phase of back EMF induced in the phase winding using the measured instantaneous phase current and the measured voltage;
determining, using the calculated phase of back EMF induced in the phase winding, a zero-crossing point of the back EMF induced in the phase winding of the motor; and
determining, based on when the back EMF induced in the phase winding is at the zero-crossing point, an aligned position of the rotor of the brushless permanent magnet motor.
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