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CONSTANT SPEED CONTROLLING DEVICE FOR A DIRECT CURRENT MOTOR

  • US 3,783,357 A
  • Filed: 11/10/1971
  • Issued: 01/01/1974
  • Est. Priority Date: 11/14/1970
  • Status: Expired due to Term
First Claim
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1. A system for controlling the speed of a DC motor having a rotor, a field coil mounted on a stator, said rotor being rotated by exciting currents intermittently supplied to said field coil, said system comprising a reference oscillator for generating a reference signal of a constant frequency, detector means for detecting the rotational frequency of the rotor, said detector means being arranged adjacent said rotor for detecting the position of rotation of the rotor being rotated and generating a corresponding output signal, speed control means for said motor comprising counter means for producing an output signal responsive to said reference signals from said oscillator and to said output signals from said detector means, means for applying exciting current to said field coil of said DC motor to bring said motor up to a predetermined speed and to maintain said motor at said predetermined speed responsive to the output signals from said counter means and to the output signals from said detector means, said counter means in said control means comprising a flip-flop circuit which is set in response to said signal from said reference oscillator, and is reset in response to said signal from said detector means.

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