Patent ID: 9118235
Filing Date: 2015-08-25
Classification: H02K

Abstract:
1. A permanent magnet motor, comprising: a rotor comprising a shaft, a rotor core fixed to the shaft, a commutator fixed to the shaft adjacent to the rotor core, and rotor windings wound about poles of the rotor core and electrically connected to the commutator, and a stator comprising a magnetically conductive round housing, at least one permanent magnet fixed to an inner surface of the housing, and brushes for making sliding contact with the commutator, wherein the ratio of an outer diameter of the rotor core to an outer diameter of the housing is in the range of 70% to 80%; wherein the rated power output of the motor is in the range of 50 to 80 watts, and the radial length of a body of the rotor pole is 6.2 mm±0.6 mm; wherein the circumferential width of the body of the rotor pole is 1.4 mm±0.2 mm, and the minimum distance between two adjacent rotor poles is 1.6 mm±0.2 mm; wherein the rotor core has 12 slots, the commutator has 24 commutator segments and the stator has 2 magnetic poles; and wherein the at least one permanent magnet comprises a plurality of ferrite magnets made of material with a maximum energy product BHmax greater than 4.3 MGOe.