Sliding brush system with shape memory alloy element for two-spe

Details Sliding brush system with shape memory alloy element for two-spe Sliding brush system with shape memory alloy element for two-spe

1996-06-17

1998-03-31

LaBalle, Clayton E.

Electrical generator or motor structure

Dynamoelectric

Rotary

310238, 310239, 310240, 310242, 310245, 310148, H02K 514

Patent

active

057342199

ABSTRACT:
A brush system for providing an electric connection to a rotating commutator wheel of an electric machine is disclosed. The brush system has a switched brush selectively switchable between an engaged position and a disengaged position and a switch connected to the switched brush and formed of a shape-memory-alloy. The switch attains an extended state at a first temperature and attaining a retracted state at a second temperature, for switching the switched brush alternately to the respective engaged position and the respective disengaged position. The switch includes a temperature conditioner for varying a temperature at the switch between the first temperature and the second temperature. The temperature condition may be an electric network wherein the internal resistance of the switch allows for heating of the switch to the second temperature.

REFERENCES:
patent: 2381982 (1945-08-01), Nardone
patent: 4658321 (1987-04-01), Lindner
patent: 4823035 (1989-04-01), Kudla et al.
patent: 5311615 (1994-05-01), Couetoux

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