Brush wear indicator having variable light energy conductor path

Details Brush wear indicator having variable light energy conductor path Brush wear indicator having variable light energy conductor path

1986-11-13

1988-05-10

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310245, 250227, H02K 1300

Patent

active

047437871

ABSTRACT:
A brush wear indicator for a dynamoelectric machine, such as a direct current motor, comprises a fiber optic conductor coupling an emitter and a detector. The fiber optic conductor is fed into a brush holder where it is supported by a spring holder to which is attached a coiled biasing spring. The fiber optic conductor includes a region of separation where an element actuated by the biasing spring operates to complete or interrupt a light path between the exposed ends of the conductor at the separation. In one embodiment, an angulated tab secured to the spring operates as a shutter to move in and out of the spring holder to complete or interrupt the light path, while in a second embodiment, a rubber flexible diaphragm having an inwardly projecting body portion is actuated by the spring, by moving in and out of said region of separation to complete or interrupt the light path. The diaphragm, moreover, forms one part of a protective enclosure for the exposed ends of the fiber optic conductor at the region of separation to protect it from becoming contaminated with dirt and other undesired materials.

REFERENCES:
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patent: 4502823 (1985-03-01), Wronski et al.
patent: 4567414 (1986-01-01), Berings

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