Variable-speed electromotive drive, especially for household app

Details Variable-speed electromotive drive, especially for household app Variable-speed electromotive drive, especially for household app

1977-12-05

1979-07-31

Truhe, J. V.

Electricity: motive power systems

Alternating current commutating motors

Universal or a.c.-d.c. motors

318305, 318345G, H02P 540

Patent

active

041631811

ABSTRACT:
Variable-speed electric motor drive includes a universal motor having a power supply line wherein a thyristor is connected and operated in a phase gating circuit, a firing circuit for the thyristor, a variable first resistance connected to the firing circuit of the thyristor for varying the rotary speed of the motor, and a temperature-dependent second resistance associated with the firing circuit and thermally coupled to the thyristor.

REFERENCES:
patent: 3225232 (1965-12-01), Turley et al.
patent: 3648142 (1972-03-01), Corey et al.
patent: 3736479 (1973-05-01), Soeda
patent: 3868554 (1975-02-01), Konrad
patent: 3962615 (1976-06-01), Spangler

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