Rotor for small-sized motor and method of manufacturing same

Details Rotor for small-sized motor and method of manufacturing same Rotor for small-sized motor and method of manufacturing same

2005-02-08

2005-02-08

Lam, Thanh (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S234000, C029S597000

Reexamination Certificate

active

06853108

ABSTRACT:
A rotor for a small-sized motor has a plurality of rotor magnetic poles and a commutator on a rotor shaft, and both ends of a wire of each winding of the rotor magnetic poles are tied up with and connected by spot welding to a U-shaped hook-type commutator leg connected to the corresponding commutator piece end of the commutator, respectively. The commutator leg has a copper-based base material, and is composed by attaching a thin layer of a clad material with a melting point lower than that of the above described base material and a high electric resistance thereon at the surface part to be inside when bent to the U-shaped hook type. Thus, in the connection between the commutator leg and the copper wire material of the small-sized motor, the reduction of defectives of breaking of the wire because of heat shock at the time of welding is achieved, and in the meantime, the stabilization of welding is achieved, so that the reliability of the connection can be increased.

REFERENCES:
patent: 3781981 (1974-01-01), Miura et al.
patent: 5113574 (1992-05-01), Nuss
patent: 5115557 (1992-05-01), Visser et al.
Mitsubishi Electric Metecs Co., Ltd., Mar. 1998, Mitsubishi Electric Copper Alloys, Catalog and Technical Data.
Japan Industrial Standard (JIS) Committee, Mar. 20, 2000, JIS Plate and Strip of Copper and Copper Alloy, JIS.

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