Electric vehicle traction motor control

Details Electric vehicle traction motor control Electric vehicle traction motor control

1978-03-07

1979-10-09

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318139, H02P 512

Patent

active

041707508

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 turned off by firing the second thyristor to divert the motor current momentarily into the commutating capacitor. A third thyristor is connected in series with an inductor across the commutating capacitor and serves on firing to reverse the voltage residing on the commutating capacitor following commutation. A circuit is connected to detect the cessation of current flow into the commutating capacitor and acts to fire the third thyristor when such cessation is detected.

REFERENCES:
patent: 3405321 (1968-10-01), Staples
patent: 3465207 (1969-09-01), Merdian, Jr.
patent: 3854076 (1974-12-01), Lambert
patent: 3993942 (1976-11-01), Schmidt et al.
patent: 4032825 (1977-06-01), Klimo
patent: 4068153 (1978-01-01), Artrip et al.
patent: 4074175 (1978-02-01), Born et al.

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