Patent ID: 8188632
Filing Date: 2012-05-29
Classification: H02K,Y10T

Abstract:
1. A miniature motor, comprising: a motor casing comprising an inner circumferential surface; magnets mounted on said inner circumferential surface of said motor casing, wherein N and S poles of said magnets are alternatingly inverted, so as to serve as field magnets; a rotary shaft; an even number of rotor poles; and a commutator having the same number of commutator segments as that of the rotor poles, said commutator segments being fixed on said rotary shaft, said commutator segments being opposite said rotor poles with respect to an axial direction of said rotary shaft, each of the rotor poles having at least one salient magnetic pole core and a winding wound about said at least one salient magnetic pole core, opposite ends of the winding being connected to respective commutator segments, and a short circuit wire connecting two commutator segments located radially opposite each other, wherein the winding connected to the commutator segments being a combination of first-type windings and second-type windings, wherein opposite ends of the first-type winding are connected to a pair of adjacent commutator segments, said pair of adjacent commutator segments having a predetermined positional relation with said winding, one end of said second-type winding being connected to one of said commutator segments located radially opposite to one of said pair of adjacent commutator segments, another end of said second-type winding being connected to one of the other of the pair of adjacent commutator segments and another one of the commutator segments located radially opposite to the other of the pair of adjacent commutator segments, wherein only one short circuit wire is used for every short circuit connection of radially opposed commutator segments.