×

Programmable dual-phase digital motor control with sliding proportionality

  • US 5,774,626 A
  • Filed: 11/16/1995
  • Issued: 06/30/1998
  • Est. Priority Date: 11/16/1995
  • Status: Expired due to Fees
First Claim
Patent Images

1. A digital motor control system for controlling the rotational speed of a motor driven by a drive voltage, said digital motor control system comprising:

  • sensor means coupled to the motor so as to produce a pulse signal comprising a series of pulses occurring at a frequency representative of the rotational speed of the motor;

    a flip-flop in electrical communication with said pulse signal, said flip-flop generating a flip-flop output signal comprising a series of pulses, each said flip-flop pulse having a rising edge corresponding to the rising edge of a sensor means pulse, and a falling edge corresponding to the rising edge of the subsequent sensor means pulse;

    reset means in electrical communication with said flip-flop output signal pulses, said reset means generating a first set of reset pulses corresponding to the rising edges of said flip-flop pulses and a second set of reset pulses corresponding to the falling edges of said flip-flop pulses;

    oscillator means having a substantially fixed frequency;

    first binary counter means in electrical communication with said oscillator means and said first set of reset pulses, for generating a first reference signal corresponding to the rising edges of said flip-flop pulses;

    second binary counter means in electrical communication with said oscillator means and said second set of reset pulses, for generating a second reference signal corresponding to the falling edges of said flip-flop pulses;

    first comparator means in electrical communication with said flip-flop and said first binary counter for comparing said first reference signal with said pulse signal and transmitting a first adjustment pulse corresponding to the rising edges of said flip-flop pulse;

    second comparator means in electrical communication with said flip-flop and said second binary counter for comparing said second reference signal with said pulse signal and transmitting a second adjustment pulse corresponding to the falling edges of said flip-flop pulse andswitch means in electrical communication with said first and second comparator means for altering the drive voltage to the motor in response to said adjustment pulses to control the speed of the motor.

View all claims
  • 11 Assignments
Timeline View
Assignment View
    ×
    ×