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Stepping motor driver

  • US 6,850,027 B2
  • Filed: 03/18/2003
  • Issued: 02/01/2005
  • Est. Priority Date: 03/19/2002
  • Status: Expired due to Fees
First Claim
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1. A stepping motor driver comprising:

  • an inverter for feeding stepped currents to windings of a stepping motor;

    a position detection means for obtaining a detected angle of a rotor of said stepping motor; and

    a current control means for controlling said inverter, wherein;

    in a d-q rotational coordinate system in which the d-axis is in the direction of the magnetic flux of said rotor of said stepping motor and the q-axis is in the direction perpendicular to said d-axis, an excitation angle for a winding is determined from a d-axis component and a q-axis component of a command current to said winding;

    a lead angle control signal is computed from said excitation angle; and

    a phase of an applied voltage to said stepping motor is controlled using said lead angle control signal.

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