Hybrid electrical machine

Driving circuitry for a stator 330 for an electrical machine 300 comprises: a first group of windings 331, a second group of windings 333; and one or more groups of capacitors 332. The capacitors in the first group of capacitors are arranged in series with associated windings and are selected such that the combination of the first group of capacitors and their associated windings have an electromagnetic resonant frequency. The second group of windings are each provided without a capacitor arranged in series. One or more switching devices may be provided to electrically connect or disconnect the first group of windings or the second group of windings from the three-phase driving signal. In a further embodiment there may be a first set of windings and a first group of capacitors arranged in series with associated windings such that the combination has an electromagnetic resonant frequency. One or more switching devices are configured to allow switching between a first arrangement where a three-phase driving signal is provided to the first group of windings with the associated capacitors in series, and a second arrangement where the driving signal is provided to the windings without a capacitor arranged in series.