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Motor control circuit for regulating a D.C. motor

  • US 6,025,683 A
  • Filed: 12/23/1998
  • Issued: 02/15/2000
  • Est. Priority Date: 12/23/1998
  • Status: Expired due to Term
First Claim
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1. A motor control circuit for regulating the speed of a motor having a rotor, a plurality of windings located around the rotor and configured to generate a pulsed signal representative of the rotational position of the rotor, said circuit comprising:

  • a tachometer for receiving the pulsed signal from the motor and producing a pulse width modulated TACHOMETER signal having an on duty cycle that is proportional to the frequency at which the pulsed signal is generated;

    ,a pulse width modulator for receiving the TACHOMETER signal and a USER-- SPEED signal representative of a user-selected speed, said pulse width modulator configured to generated a pulse width modulated SPEED-- CONTROLPWM signal that has an on-duty cycle proportional to the difference between an integral of the TACHOMETER signal and the USER-- SPEED signal; and

    a motor driver for receiving the pulsed signal from the motor and the SPEED-- CONTROLPWM signal for producing a plurality of HIGH-- SIDE-- CONTROL signals, each HIGH-- SIDE-- CONTROL signal being asserted to cause a separate one of the motor windings to be connected to a power source, and a plurality of LOW-- SIDE-- CONTROL signals, each LOW-- SIDE-- CONTROL signal being asserted to cause a separate one of the motor windings to be connected to ground, wherein the motor driver sequentially asserts the HIGH-- SIDE-- CONTROL signals and the LOW-- SIDE-- CONTROL signals as a function of the pulsed signal and the on-duty cycle of the SPEED-- CONTROLPWM signal.

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