Electric motor protector

Details Electric motor protector Electric motor protector

1975-02-24

1977-07-05

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

338114, 337349, 337139, 361 24, H02H 7085, H02H 308

Patent

active

040342654

ABSTRACT:
Apparatus for protecting the armature of an electric motor against excessive temperatures comprises a resiliently compressible and expansible pad in the armature circuit and composed of thermally sensitive, non-conductive material containing a plurality of conductive particles engageable with one another when the pad is in a compressed condition to establish a conductive path through the pad. The pad normally is maintained in a compressed, conductive condition by resilient force applying means which is of such resilience as to permit expansion of the pad in response to an increase in its temperature and render the pad non-conductive.

REFERENCES:
patent: 2987919 (1961-06-01), Kirby
patent: 3023350 (1962-02-01), Broadley et al.
patent: 3613732 (1971-10-01), Willson et al.
patent: 3629774 (1971-12-01), Crites
patent: 3634803 (1972-01-01), Willson et al.
patent: 3648002 (1972-03-01), DuRocher

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