Electrical vehicle traction equipment

Details Electrical vehicle traction equipment Electrical vehicle traction equipment

1978-09-20

1980-09-02

Smith, Jr., David

Electricity: motive power systems

Limitation of motor load, current, torque or force

318376, 361 15, H02P 314

Patent

active

042209021

ABSTRACT:
An improved traction apparatus for electrical vehicles that are supplied with energy over a contact line and that utilize a filter capacitor to smooth the input current to a DC convertor that is used to energize a driving motor. The improvement concerns means for avoiding surges of filter capacitor charging current when the line voltage rises after a line voltage drop. A thyristor is used to pass current to the convertor when the line voltage remains within a particular operational range and to block the flow of current to direct the current to a current limiting resistor when the line voltage begins to rise after a short duration or relatively longer duration voltage drop.

REFERENCES:
patent: 3543121 (1970-11-01), Miller
patent: 3569810 (1971-03-01), Thiele
patent: 3803454 (1974-04-01), Higuchi
patent: 4074175 (1978-02-01), Born et al.

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