Brushless DC motor and stator thereof

Details Brushless DC motor and stator thereof Brushless DC motor and stator thereof

2006-03-08

2008-10-21

Nguyen, Tran (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S06700R

Reexamination Certificate

active

07439647

ABSTRACT:
A brushless DC motor and a stator thereof. The stator comprises an upper magnetic pole piece and a lower magnetic pole piece. The upper magnetic pole piece comprises a plurality of upper protruding portions extending toward the lower magnetic pole piece, and the lower magnetic pole piece comprises a plurality of lower protruding portions extending toward the upper magnetic pole piece. The upper protruding portions and the lower protruding portions are substantially spaced apart and alternately arranged. A positioning portion extending from a distal end of each upper protruding portion is located below the magnetic ring of the rotor, to increase the magnetic force therebetween. Alternatively, a positioning portion can be formed between the lower protruding portions of the lower magnetic pole piece and extended to the bottom of the rotor; thus, an axial attraction force can be generated to stabilize the rotor.

REFERENCES:
patent: 6538357 (2003-03-01), Horng et al.
patent: 6700294 (2004-03-01), Horng et al.
patent: 6759786 (2004-07-01), Horng et al.
patent: 6853101 (2005-02-01), Lin et al.
patent: 6982505 (2006-01-01), Horng et al.

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