Patent ID: 7821170
Filing Date: 2010-10-26
Classification: F01P,H02K

Abstract:
1. A DC motor comprising: a permanent magnet stator; and a wound rotor; wherein the stator has an even number of magnetic poles and the rotor has a shaft, a rotor core fitted to the shaft, and having a number m of rotor teeth about which a winding is wound, a commutator fitted to the shaft adjacent the core, the commutator having 2 m commutator segments having terminals to which the winding is connected, wherein the winding has 2 m rotor coils with each coil being wound around a respective one of the rotor teeth, and each rotor tooth having wound there on two rotor winding coils forming a rotor coil pair, and the coils of each rotor coil pair wound with opposite polarity and the ends of each coil are connected to adjacent segments of the commutator.