Speed control system of traction motor for electric vehicles

Details Speed control system of traction motor for electric vehicles Speed control system of traction motor for electric vehicles

1977-05-10

1979-04-17

Schaefer, Robert K.

Electricity: motive power systems

Battery-fed motor systems

318341, 318345F, 318345G, 318434, H02P 500

Patent

active

041503244

ABSTRACT:
A speed control system of traction motors for electric vehicles comprises a traction motor for causing an electric vehicle to run, a D.C. supply source for supplying voltage to the traction motor, a chopper for chopping the voltage fed from the D.C. supply source to the motor, and a chopper control circuit for controlling the operation of the chopper. The chopper control circuit comprises a circuit for producing a saw-tooth wave signal, a comparator which compares an accelerator signal, whose level is varied with the speed control operation by means of an accelerator pedal of the electric vehicle, with a saw-tooth wave signal from the saw-tooth wave signal generator circuit to produce a rectangular wave signal having a width proportional to the accelerator signal, and a circuit for producing pulse signals at the rise of the rectangular wave signal and at the fall thereof, respectively. The chopper starts to apply the voltage by one of the pulse signals produced in response to the rising rectangular wave signal and interrupts the voltage by the other pulse signal produced in response to the falling rectangular wave signal.

REFERENCES:
patent: 3596162 (1971-07-01), Takayama
patent: 3743911 (1973-07-01), Erler
patent: 3783360 (1974-01-01), Bundy
patent: 3875486 (1975-04-01), Barton
patent: 3883786 (1975-05-01), McNaughton et al.
patent: 3914672 (1975-10-01), Kiwaki et al.
patent: 4066934 (1978-01-01), Waldorf et al.

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