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Method and apparatus for controlling a servo motor using a stepper motor controller integrated circuit

  • US 5,936,371 A
  • Filed: 02/16/1999
  • Issued: 08/10/1999
  • Est. Priority Date: 02/16/1999
  • Status: Expired due to Term
First Claim
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1. A method for controlling a servo motor, said method comprising:

  • (a) providing (i) a stepper motor controller integrated circuit, (ii) a DC servo motor that rotates in two directions, (iii) a pulse-width modulated speed control signal, (iv) a direction control signal, and (v) an interface circuit;

    (b) applying said direction control signal to a Phase control input of said stepper motor controller integrated circuit such that;

    a first logic state of said direction control signal tends to cause said DC servo motor to rotate in a forward direction, and a second logic state of said direction control signal tends to cause said DC servo motor to rotate in a reverse direction;

    (c) applying said speed control signal to said interface circuit which generates (i) a comparator signal that is provided to a Comparator input of said stepper motor controller integrated circuit, and (ii) a trigger signal that is provided to a Pulse Time input of said stepper motor controller integrated circuit, said speed control signal generating pulses at times that said DC servo motor is to rotate in either direction; and

    (d) applying an output signal that is generated by said stepper motor controller integrated circuit to said DC servo motor at times that said DC servo motor is to rotate in either direction, said output signal having a duty cycle of pulses related to a duty cycle of said speed control signal.

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