Electric vehicle traction motor control

Details Electric vehicle traction motor control Electric vehicle traction motor control

1978-03-07

1979-10-23

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318139, H02P 512

Patent

active

041722337

ABSTRACT:
An electric vehicle traction motor control circuit includes a main thyristor in series with the motor armature. A second thyristor is connected in series with a commutating capacitor across the main thyristor which can be switched off by firing the second thyristor so that the motor current is diverted into the commutating capacitor. A third thyristor is connected in series with an inductor across the commutating capacitor and serves when fired to reverse the voltage residing on the commutating capacitor following commutating. The reversed voltage on the capacitor is detected and is used to control upper and lower current limit signals set by a driver operable control so that the capacitor is not called upon to receive a large current when it is in a low voltage condition.

REFERENCES:
patent: 3993942 (1976-11-01), Schmidt et al.
patent: 4032825 (1977-06-01), Klimo
patent: 4074175 (1978-02-01), Born et al.
patent: 4081725 (1978-03-01), Schmidt et al.

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