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Method of controlling positioning of rotor of stepping motor

  • US 4,691,153 A
  • Filed: 02/07/1986
  • Issued: 09/01/1987
  • Est. Priority Date: 02/09/1985
  • Status: Expired due to Term
First Claim
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1. A method of controlling the positioning of a rotor of a stepping motor having phase windings comprising the steps of:

  • (1) energizing the windings within the last step in a movement of the rotor to a desired rest position thereof so as to produce a first magnetic vector, a position indicated by said first magnetic vector being displaced from said desired rest position of the rotor in the direction of said movement thereof by a predetermined amount so that the rotor is caused to overshoot said desired rest position of the rotor by such an amount that a positioning error of the rotor due to a hysteresis characteristic thereof in the direction of said movement is compensated; and

    (2) subsequently energizing the windings so as to produce a second magnetic vector, a position indicated by said second magnetic vector coinciding with said desired rest position of the rotor.

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