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Pseudo half-step motor drive method and apparatus

  • US 6,285,155 B1
  • Filed: 10/29/1999
  • Issued: 09/04/2001
  • Est. Priority Date: 10/29/1999
  • Status: Expired due to Term
First Claim
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1. A method for driving a stepper motor having a detent torque and defining a plurality of stepped positions, the stepper motor being operatively coupled to a load and comprising a rotor and a plurality of windings, said plurality of windings being selectively energized to rotate the rotor in a stepped motion from a current stepped position to an adjacent stepped position, the method comprising the steps of:

  • (a) energizing selected windings among said plurality of windings for a predetermined step time and at predetermined current levels so as to produce a magnetic field vector that is not aligned with a stepped position, said predetermined step time and predetermined current levels having been determined to enable the rotor to achieve the adjacent stepped position without substantial overshoot and with substantially a zero velocity when the step time has expired; and

    (b) de-energizing the windings that were energized in step (a) after the step time, the rotor being held in the adjacent stepped position by the stepper motor detent torque.

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