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Stepper motor ramp generation

  • US 5,274,316 A
  • Filed: 05/06/1991
  • Issued: 12/28/1993
  • Est. Priority Date: 05/06/1991
  • Status: Expired due to Term
First Claim
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1. A method for generating a stepper motor ramp for controlling the times between electrical pulses supplied to the motor for advancing the motor, said method comprising the steps of:

  • a) determining the minimum available torque for the motor;

    b) applying to the available torque a safety factor and then a safety margin to obtain the maximum usable torque wherein the safety factor is derived from motor information and the safety margin is derived from information on a system of which the motor is a part;

    c) calculating the maximum acceleration from the friction and moment of inertia of the system of which the motor is a part and the maximum usable motor torque;

    d) calculating the time duration of the next step for advancing the motor;

    e) repeating steps a) through d) to determine all steps in the ramp; and

    f) utilizing the generated stepper motor ramp in advancing the motor by providing a series of electrical pulses of suitable amplitude and pulse width to advance the stepper motor wherein the times between the pulses are controlled by the ramp.

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