Patent ID: 7982354
Filing Date: 2011-07-19
Classification: F01P,H02K

Abstract:
1. A DC motor, comprising: a stator housing accommodating a permanent magnet stator having 2n stator poles; a rotor, rotatably mounted confronting the stator, the rotor comprising a shaft, a rotor core fitted to the shaft, a commutator fitted to the shaft adjacent one end of the rotor core, windings wound about teeth of the rotor core and electrically connected to segments of the commutator; and brush gear comprising a plurality of brushes in sliding contact with the commutator for transferring electrical power to the windings, wherein the rotor core has m rotor teeth and the rotor windings have 2m coils, each coil wound about a respective single one of the rotor teeth and each rotor tooth supporting two of said coils, and the commutator has 2m segments with each coil connected to a respective pair of adjacent commutator segments and each segment respectively electrically connected to two of the coils, and wherein 2.6n ≦m ≦3.2n, where n is an integer greater than 2 and less than 10.