Patent ID: 8193750

Claim:
An electrical machine arrangement comprising: a rotor, a stator having a plurality of phases, each phase comprising at least one stator coil, each phase having a motoring period, a generating period and a dead period, and a power supply including a DC link capacitor and a controller, the controller being arranged to supply electrical current from: (i) a first phase of the electrical machine at an end of the motoring period of the first phase to a second phase of the electrical machine at an end of the dead period and at the start of the motoring period of the second phase, (ii) the first phase of the electrical machine at the end of the motoring period of the first phase to a third phase of the electrical machine at the end of the generating period and at the start of the dead period of the third phase, (iii) the power supply to the second phase of the electrical machine at the end of the dead period and at the start of the motoring period of the second phase, and (iv) the power supply to the third phase of the electrical machine at the end of the generating period and at the start of the dead period of the third phase whereby the size of the DC link capacitor is reduced.