Motor with brush and commutator, and electric apparatus...

Details Motor with brush and commutator, and electric apparatus... Motor with brush and commutator, and electric apparatus...

2005-01-11

2005-01-11

Mullins, Burton (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S206000, C310S234000

Reexamination Certificate

active

06841914

ABSTRACT:
An arc length in contact with a commutator of two brushes in a rotational direction of a motor is defined as not more than 5% of an outer rim length or circumference of the commutator, i.e., not more than πA/2O, where A is an outside diameter of the commutator. A number of shorted segments of the commutator, which short is caused by the brush, can be minimized so that reduction in output of the motor can be prevented. As a result, the motor employed in a car product or an electric tool can be downsized and made lighter.

REFERENCES:
patent: 4404485 (1983-09-01), Ban et al.
patent: 4437028 (1984-03-01), Ikeda
patent: 4459503 (1984-07-01), Kropp et al.
patent: 4876472 (1989-10-01), Shiraki et al.
patent: 5202599 (1993-04-01), Kao
patent: 0 072 283 (1983-02-01), None
patent: 2 705 843 (1994-12-01), None
patent: 11-341723 (1999-12-01), None

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