Method and circuit for DC motor field regulation with speed feed

Electricity: motive power systems – Braking – Automatic and/or with time-delay means

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318326, 318327, 318331, H02P 506

Patent

active

045491224

ABSTRACT:
A method and a circuit for motor field regulation in the constant horsepower speed range, wherein the weakening of field current allows operation of the motor at speeds higher than the base speed while maintaining rated armature voltage. The field current is weakened in response to speed feedback signals to provide a rapid response in controlling field current. The motor field is also regulated in response to a counter-EMF and IR compensation circuit to further weaken the field current, where the counter-EMF developed in the DC motor would cause excessive voltage across the armature.

REFERENCES:
patent: 3657623 (1972-04-01), Fludzinski
patent: 3795850 (1974-03-01), Grygera
patent: 3950684 (1976-04-01), Peterson
patent: 3969660 (1976-07-01), Ruppert
patent: 3996504 (1976-12-01), Grzebielski
patent: 4484117 (1984-11-01), Bose
Allen-Bradley Company, "Thyristor Regulated DC Motor Control", 1973.
SWEO Engineering Inc., Field Regulator and Associated Circuitry, 1981, as disclosed in Exhibit A.
Reliance Electric Instruction Manual D-3867-1, Max Pak Plus Spindle Drive, Sep. 1981, pp. 45-47.

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