Shunt-wound control for on-road vehicle
AssigneeGeneral Electric Company
InventorCharles E. Konrad
Life of this patent
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Abstract
A power control system for a DC electric motor includes a control power regulating means which selectively connects either the armature of the motor, the field winding of the motor or both in a series current path with a DC power source permits operation of the motor in either an armature current or field current control mode using a single regulating circuit. In the field current control mode a contactor connects the armature of the motor directly across the power source and the regulating circuit controls the field current to regulate torque developed by the motor. The armature circuit and field circuit are interconnected by a diode which permits electronic switching between armature current control and field current control modes of operation.
Claims10
A power control system for a DC electric motor having an armature and a field winding each adapted to be energized from a DC power source, the system comprising:
- (a) controllable power regulating means;
- (b) means for connecting said power regulating means and the motor field winding in a series current path with the DC power source;
- (c) normally open first switch means;
- (d) means for connecting said first switch means and the motor armature in a series current path with the DC power source;
- (e) component means for connecting a junction intermediate the motor armature and said first switch means to a junction intermediate the motor field winding and said regulating means whereby the series combination of motor armature and said component means is connected in a parallel current path with the motor field winding;
- and
- (f) control means for varying the conduction of said power regulating means to thereby increase or decrease current through both the armature and the field winding substantially simultaneously in a first operational mode, said control means including means for actuating said first switch means when the voltage on the armature attains a predetermined value and for thereafter regulating current only through the field winding in a second operational mode while maintaining actuation of said first switch means.
Dependencies are inferred from the claim text.