Constant force brush spring arrangement for electric motor

Details Constant force brush spring arrangement for electric motor Constant force brush spring arrangement for electric motor

1997-11-07

1999-05-25

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310239, 310244, 310242, 310246, H02K 1300

Patent

active

059072075

ABSTRACT:
The present invention offers a commutation assembly for an electrical motor, whereby a constant optimal pressure is maintained upon the commutator of the motor. This is accomplished by a commutation assembly comprising a torsion brush spring apparatus situated adjacent to a brush unit, the torsion brush spring apparatus generally comprising a spring element with a first end, a coiled center section, and a second end; the spring element having its coiled center section encircling and pivoting about a projection from the motor plate, the projection placed a certain distance D1 from the brush center line and a distance D2 above the lower edge of the brush; a first end extending towards the upper edge of the brush unit and applying a certain force Fx on the upper edge of the brush; and a second end abutting a portion of the motor casing; the brush unit generally comprising a brush having an upper edge in contact with the first end of the spring element and a lower edge in contact with the commutator; the brush unit also comprising a brush holder having a first exterior wall, a second exterior wall, a stop, an end and an aperture; wherein the brush holder, which is situated above the commutator allowing the brush to move longitudinally within the aperture to make contact with the commutator, provides a constant optimal pressure against the commutator due to the constant resulting force applied by the spring element on the brush.

REFERENCES:
patent: 4163167 (1979-07-01), Zelt et al.
patent: 4559465 (1985-12-01), Gagneux
patent: 4595851 (1986-06-01), Houben et al.
patent: 4638203 (1987-01-01), Maki et al.
patent: 5053665 (1991-10-01), Yamaguchi et al.
patent: 5227950 (1993-07-01), Twerdochlib
patent: 5373210 (1994-12-01), Bear et al.

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