Brush of rotary electric machine

Details Brush of rotary electric machine Brush of rotary electric machine

2006-11-21

2006-11-21

Mullins, Burton (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S252000

Reexamination Certificate

active

07138744

ABSTRACT:
A brush to be disposed on a commutator of a dc rotary electric machine includes a high resistance member to be positioned at a front side of the commutator in the rotation direction, a low resistance member to be positioned at a back side in the rotation direction of the commutator, a medium resistance member disposed between the high resistance member and the low resistance member. The content of conductive material is arranged so that the low resistance member and the high resistance member have a difference ranging from 45% to 70%, and so that the medium provides a thermal expansion coefficient between the low resistance member and the high resistance member.

REFERENCES:
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patent: 2613239 (1952-10-01), Lundy
patent: 3274304 (1966-09-01), Horton et al.
patent: 3821024 (1974-06-01), Wilkin
patent: 4000430 (1976-12-01), Bely et al.
patent: 5387831 (1995-02-01), Yang
patent: 6528923 (2003-03-01), Katoh et al.
patent: 6815862 (2004-11-01), Inukai et al.
patent: 6-233498 (1994-08-01), None
patent: 2002-176750 (2002-06-01), None

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