Phase control circuit for protection of a motor against thermal

Details Phase control circuit for protection of a motor against thermal Phase control circuit for protection of a motor against thermal

1989-02-03

1991-01-01

Ro, Bentsu

Electricity: motive power systems

Automatic and/or with time-delay means

Responsive to thermal conditions

318434, 318473, 361 24, 361 25, H02H 708, G05D 2320

Patent

active

049821431

ABSTRACT:
Thermal overload of a motor is avoided by measuring temperature and, when a limit temperature is exceeded, reducing the phase "window" within each power cycle during which the motor is energized. The limit temperature is sensed by a temperature sensor which is warmed either by heat conduction through a cooling body or by an air stream from the motor. The overload protection apparatus requires no measuring resistance in the load circuit.

REFERENCES:
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patent: 3421027 (1969-01-01), Maynard et al.
patent: 3535615 (1970-10-01), Howell et al.
patent: 3543119 (1970-11-01), Bauer et al.
patent: 3551774 (1970-12-01), Rusch
patent: 3569781 (1971-03-01), Strachan
patent: 3683250 (1972-08-01), Fricker
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patent: 3708720 (1973-01-01), Whitney et al.
patent: 3868554 (1975-02-01), Konrad
patent: 4097790 (1978-06-01), Wilson
patent: 4157513 (1979-06-01), Ghiringhelli et al.
Motor Speed Applications Using the TDA 2085A, Motorola/Plessey, 1982.

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