Reduction of the torque ripple of a plurality of harmonic components

摘要

A electric motor system contains a motor, which is designed to in response to a torque command to generate a torque signal. The torque signal has a base frequency component, a first harmonic of the ripple and a second harmonic of the ripple. The first harmonic of the ripple is an integral multiple of the base frequency component. The second harmonic of the ripple is an integral multiple of the first harmonic of the ripple. A system and a method is provided in order for a ripple reduction signal in response to the torque command to generate the first and second harmonic of the ripple in the torque signal at the same time is cancelled out. The second harmonic of the ripple, with the first harmonic of the ripple, in that they be cancelled by a transformation matrix to the first harmonic of the ripple is imaged.