Patent ID: 9716450
Date: 2017-07-25
CPC Classifications: H02K,H02P

Claim:
1. An electronically commutated electric motor having a stator and a rotor, the electric motor comprising: a control unit connected to the stator, and configured to generate control signals for supplying stator coils of the stator with current for generating a rotating magnetic field, and wherein the electric motor is configured to at least partially compensate for a torque ripple of a torque generated by the rotor, a rotor position sensor; and a current sensor, wherein the current sensor is configured to detect currents flowing in the stator coils and to generate a current signal representing the currents flowing in the stator coils, wherein the control unit comprises a processing unit, wherein the processing unit is configured to ascertain harmonics of an electromotive force and to generate a compensating control signal which compensates for the effect of the harmonics as a function of the current signal and a voltage supplied to the stator coils and a rotor position signal generated by the rotor position sensor, and wherein the processing unit is further configured to overlap the compensating control signal with the control signal, so that it is possible to compensate at least partially or completely for the effect of the harmonics and thus the torque ripple.