Ventilated brush holder

Details Ventilated brush holder Ventilated brush holder

1993-04-05

1994-03-22

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 88, 310239, 310 89, H02K 1300

Patent

active

052967727

ABSTRACT:
A ventilated brush holder for an alternating current generator. The brush holder has a tubular shield portion, a brush holding portion and a bearing retainer portion. The shield portion encloses the slip rings of the rotor of the generator. The brush holding portion has bores that are open to the interior of the shield portion. Brushes are located in the bores that project into the shield portion and engage the slip rings. The bearing retaining portion is disposed between and engages an internal surface of an opening in the frame of the generator and an outer surface of the outer race of a ball bearing for the rotor shaft. The bearing retainer portion has a plurality of circumferentially spaced and axially extending slots that form air passages. A fan is driven by the rotor shaft and when it is rotated, air is caused to flow through the shield portion and then through the slots in the bearing retainer portion. This flow of air cools the brushes and the bearing and carries away brush dust. Moisture contained in the air tends to promote the creation of a brush dust film on the slip rings.

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Publication-"Alternator Anti-Contamination Shield", Research Disclosure No. 33480, Feb., 1992.

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