Thermal overload protection apparatus for a commutator or slipri

Details Thermal overload protection apparatus for a commutator or slipri Thermal overload protection apparatus for a commutator or slipri

1985-08-12

1987-04-14

Tolin, G. P.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

318471, 337140, 310 68C, 310238, 310249, H02H 504

Patent

active

046583211

ABSTRACT:
A thermally released switching mechanism which in a simple fashion and at a precisely defined switching point clearly interrupts the current to the motor when a preset, highest admissible temperature is exceeded, at least until the actual temperature has once against fallen below the highest admissible temperature. The thermally released switching mechanism is comprised of a lever element made of a memory element which, upon exceeding the highest permissible temperature set value, lifts the brush from a commutator or a slipring. This mechanism preferrably employs a memory element with a two-way effect. This thermal switching mechanism is suitable both for commutator motors with hammer or tubular brush holder systems as well as for slipring motors.

REFERENCES:
patent: 3872415 (1975-03-01), Clarke
patent: 4034265 (1977-07-01), DuRocher et al.
patent: 4499517 (1985-02-01), Lisauskas
patent: 4564775 (1986-01-01), Mazzorana
German Publication Material and Technik, No. 2, 1978, article "Mechanismus und Anwendungen des Formgedaechtniseffektes", by K. N. Melton and O. Mercier (translation not available).

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