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Control apparatus for vibration type actuator, vibration type actuator system, and method for controlling vibration type actuator

  • US 20040124742A1
  • Filed: 09/25/2003
  • Published: 07/01/2004
  • Est. Priority Date: 10/07/2002
  • Status: Active Grant
First Claim
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1. A control apparatus for a vibration type actuator, the vibration type actuator comprising a rotatable moving member, an elastic member contacting the moving member, and an electro-mechanical energy conversion element exciting at least three different kinds of vibrations in the elastic member by supplying at least three periodic signals with different phases, the control apparatus supplying the periodic signals to the vibration type actuator in order to rotate the moving member to a target position, comprising:

  • a rotation axis determining unit which determines a rotation axis for rotating the moving member to the target position;

    a parameter determining unit which determines, by using an inverse model, phases and amplitudes of the periodic signals for rotating the moving member around the rotation axis determined by the rotation axis determining unit; and

    a control circuit which supplies the periodic signals having the phases and amplitudes determined by the parameter determining unit to the electro-mechanical energy conversion element.

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