D.C. Motor control for an electrically powered vehicle

Details D.C. Motor control for an electrically powered vehicle D.C. Motor control for an electrically powered vehicle

1979-07-06

1981-01-20

Smith, Jr., David

Electricity: motive power systems

Battery-fed motor systems

318345C, 318345G, H02P 516

Patent

active

042465192

ABSTRACT:
A d.c. motor control circuit includes an armature current chopper including a main thyristor, a commutating thyristor for turning off the main thyristor by diverting the armature current into a commutating capacitor and a third thyristor connected to reverse the voltage on the capacitor. There is a charging path for the capacitor to keep it charged up to the voltage it reaches on commutation and the firing circuits for the thyristors are arranged to ensure that the third thyristor is fired a fixed period before the commutating thyristor. This ensures that there is an adequate reverse voltage on the capacitor for correct commutation to occur.

REFERENCES:
patent: 3530503 (1970-09-01), Appelo et al.
patent: 3629673 (1971-12-01), Thorborg
patent: 3665286 (1972-05-01), Ohno et al.
patent: 3753077 (1973-08-01), Anderson et al.
patent: 4066939 (1978-01-01), Joyes

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