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Speed regulation system for DC motors with hall generators

  • US 3,999,108 A
  • Filed: 07/14/1975
  • Issued: 12/21/1976
  • Est. Priority Date: 08/16/1972
  • Status: Expired due to Term
First Claim
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1. A DC motor and control system therefore comprising, in combination:

  • a. A DC motor comprisinga rotor having magnetic poles of opposite polarities thereon and a non-uniform magnetic flux distribution, andstator windings positioned in torque-producing relation to said rotor;

    b. Hall generators positioned in flux-sensing relation to said magnetic poles so as to detect the instantaneous rotational speed thereof and to generate electrical signals with a frequency representing the instantaneously changing rotational speed of said DC motor;

    c. means connected to said Hall generators for detecting the crest or peak values of the output signals of said Hall generators so as to generate pulse signals representing said crest or peak values,d. means for generating a signal of a waveform corresponding to the magnetic flux distribution of said rotor to retain an axis output of said DC motor constant by compensating for a magnetic flux distribution inherent to the field of said DC motor comprising;

    a plurality of waveform generators each adapted to be triggered in response to the pulse signals from said pulse signal generating means to generate the signal with the desired waveform, and switching means for selectively outputting the output signals with various waveforms of said waveform generator, whereby a signal with a desired waveform for compensating for the flux distribution in the DC motor may be developed,e. motor speed detecting means disposed independently of said Hall generators for generating electrical signals representative of said instantaneous rotational speed of said rotor,f. amplifier means to which are applied the output signals from said waveform generating means and the output signal of said motor speed detecting means,said amplifier means being adapted to control the amplification gain of the output signals from the waveform generating means in response to the level of the output signal from said motor speed detecting means, andg. driving control means connected to both said amplifier means and said stator windings for applying an exciting current to said windings in response to the output of said amplifier means.

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