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DC Motor control using motor-generator set with controlled generator field

  • US 4,323,830 A
  • Filed: 05/21/1980
  • Issued: 04/06/1982
  • Est. Priority Date: 05/21/1980
  • Status: Expired due to Term
First Claim
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1. A system for controlling a d.c. drive motor subject to variable load comprising:

  • a source of the d.c. current, a motor-generator set having a d.c. generator connected in series between the source of current and the drive motor such that common polarity terminals of the power source and the generator are connected together so that the generator generates a voltage in opposition to the power source, said generator having at least one field winding subject to control, and motor means rotationally coupled to the d.c. generator to drive the generator and electrically coupled to the source of d.c. power, andmeans to vary said at least one field winding whereby, when the d.c. drive motor is at rest, the field of the generator is controlled so that its generator voltage output is equal to but opposite to the voltage output of the power source, the motor generator means alternately acting as a motor to drive the generator and as a generator driven by the generator acting as a motor whereby power corresponding to the unused excess energy is fed back into the power source.

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