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

1980-04-01

Smith, Jr., David

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

318338, 318376, 318405, 318423, 318493, H02P 314, H02P 506

Patent

active

041963776

ABSTRACT:
An electric vehicle traction motor control circuit includes separate armature and field current controls. The armature control includes a difference amplifier connected to compare a current demand signal with an actual current signal from a transducer and a switching circuit controlled by this difference amplifier. The field control includes a second difference amplifier which operates to weaken the field current in either of two eventualities. In motoring the second difference amplifier receives its input via a start up circuit which connects the output of the first difference amplifier to the input of the second difference amplifier when the switching means has been in a first state for more than a predetermined time. In this case the field is weakened in accordance with the short fall of the output of the first difference amplifier below a first reference level. In braking the second difference amplifier receives its input via a further difference amplifier and a diode gate to weaken the field current in accordance with the excess of armature current over a second reference level.

REFERENCES:
patent: 3378746 (1968-04-01), Weiser
patent: 3569809 (1971-03-01), Comer
patent: 3841238 (1974-10-01), Thompson et al.
patent: 3866098 (1975-02-01), Weiser
patent: 3989990 (1976-11-01), Thompson
patent: 4037144 (1977-07-01), Ohmae et al.

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