Control circuits for electric traction motors for vehicles

Details Control circuits for electric traction motors for vehicles Control circuits for electric traction motors for vehicles

1977-10-31

1980-02-19

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318406, 318493, H02P 516

Patent

active

041896670

ABSTRACT:
An electric vehicle traction motor control circuit includes an armature current control and a separate field current control. The armature current control includes an armature current demand signal generator, a difference amplifier comparing the demand signal with a signal from an armature current transducer. This amplifier drives an armature current switching regulator including a Schmitt trigger. The field current control is arranged to provide a fixed field current normally, which is weakened when the actual armature current fails to reach its demand value. The field current control thus includes a start up circuit connected to the output of the Schmitt trigger and arranged to operate, when the Schmitt trigger output has been in a first state for more than a predetermined duration, to connect the output of the first difference amplifier to the input of a further difference amplifier to weaken the field current in accordance with the difference between the output of the first difference amplifier and a reference level.

REFERENCES:
patent: 3378746 (1968-04-01), Weiser
patent: 3569809 (1971-03-01), Comer
patent: 3982612 (1976-06-01), Kawasaki
patent: 3989990 (1976-11-01), Thompson
patent: 4037144 (1977-07-01), Omae et al.
patent: 4052647 (1977-10-01), Thompson

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