Field weakening circuits for electric motors

Details Field weakening circuits for electric motors Field weakening circuits for electric motors

1979-04-17

1981-02-10

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318533, H02P 516

Patent

active

042504376

ABSTRACT:
A field weakening circuit for an electric motor comprises a switching circuit the impedance of which is variable connected in parallel with a field winding of the motor. The switching circuit impedance is variable in dependence upon motor speed and current, either continuously or in a plurality of discrete steps, to control the current through the field winding.

REFERENCES:
patent: 3388306 (1968-06-01), Koppelmann
patent: 3962612 (1976-06-01), Kawasaki
patent: 3983465 (1976-09-01), Tsuboi et al.

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