John A Stone

US Patent:

43238300, Apr 6, 1982

Filed:

May 21, 1980

Appl. No.:

6/151973

Inventors:

Charles A. Belsterling - Norristown PA
John Stone - Medford NJ

Assignee:

The Franklin Institute - Philadelphia PA

International Classification:

H02P 520

US Classification:

318158

Abstract:

A d. c. generator is connected in series opposed to the polarity of a d. c. power source supplying a d. c. drive motor. The generator is part of a motor-generator set, the motor of which is supplied from the power source connected to the motor. A generator field control means varies the field produced by at least one of the generator windings in order to change the effective voltage output. When the generator voltage is exactly equal to the d. c. voltage supply, no voltage is applied across the drive motor. As the field of the generator is reduced, the drive motor is supplied greater voltage until the full voltage of the d. c. power source is supplied when the generator has zero field applied. Additional voltage may be applied across the drive motor by reversing and increasing the reversed field on the generator. The drive motor may be reversed in direction from standstill by increasing the generator field so that a reverse voltage is applied across the d. c. motor.