Apparatus and method for controlling an electric machine

摘要

A controller for an electronically commutated electrical machine receives a feedback signal indicative of a parameter which it is desired to minimise, eg torque ripple, current, voltage, vibration or acoustic noise. The controller computes the amplitude and phase of a set of harmonics in the parameter and sequentially injects harmonics of the correct amplitude and phase to minimise the parameter. An optimising routine iterates through the set of harmonics to further reduce the parameter.