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Short Compensating Brush

IP.com Disclosure Number: IPCOM000090550D
Original Publication Date: 1969-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Fisher, GA: AUTHOR

Abstract

Brush 10 is pressed against commutator or slip ring 11 by coaxially disposed copper-coated spring steel wire 12. The latter carries the current between brush 10 and the conductive press fit metal cap 13, disposed in annular cavity 14 of motor frame 15. As the current through brush 10 and spring 12 increases greatly, the resultant magnetic field tends to compress spring 12, thus forcing the brush 10 harder against the commutator or slip ring 11. During periods of high current magnitudes, brush 10 has increased pressure against commutator 11 for decreasing resistance between brush 10 and commutator 11. This arrangement is useful in pulsed motors, such as servo motors. Previously, the spring is disposed between one end of the brush and a stop member.

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Short Compensating Brush

Brush 10 is pressed against commutator or slip ring 11 by coaxially disposed copper-coated spring steel wire 12. The latter carries the current between brush 10 and the conductive press fit metal cap 13, disposed in annular cavity 14 of motor frame 15. As the current through brush 10 and spring 12 increases greatly, the resultant magnetic field tends to compress spring 12, thus forcing the brush 10 harder against the commutator or slip ring 11. During periods of high current magnitudes, brush 10 has increased pressure against commutator 11 for decreasing resistance between brush 10 and commutator 11. This arrangement is useful in pulsed motors, such as servo motors. Previously, the spring is disposed between one end of the brush and a stop member. In such an instance, current flowing through the spring tends to compress the spring, reducing the pressure between the brush and the commutator.

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