Fast operating overload switching circuit for universal motors

Details Fast operating overload switching circuit for universal motors Fast operating overload switching circuit for universal motors

1975-10-28

1977-08-02

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 92, 361100, H02H 7085

Patent

active

040401170

ABSTRACT:
Circuitry for rapidly switching off the power to a universal motor upon sensing of overloading of the motor. Sudden motor overloading results in rapid speed reduction that is detected by measuring the voltage drop across the motor armature. The circuitry detects this drop and removes a gating signal to a triac switch in series with the motor to remove the power to the motor within one cycle of the applied AC.

REFERENCES:
patent: 3127541 (1964-03-01), Tarjan et al.
patent: 3600635 (1971-08-01), Neilson
patent: 3696288 (1972-10-01), Carman
patent: 3719859 (1973-03-01), Frantz et al.
patent: 3784846 (1974-01-01), Krick et al.
patent: 3883782 (1975-05-01), Beckwith

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