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Torque stabilizer for brushless servo motor

  • US 20040036429A1
  • Filed: 05/16/2003
  • Published: 02/26/2004
  • Est. Priority Date: 09/17/2001
  • Status: Active Grant
First Claim
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1. A torque stabilizing device of a brushless servo motor comprising:

  • a brushless servo motor for driving a driven body;

    a hall device of each phase for detecting a position of permanent magnet rotor of the brushless servo motor;

    a switching unit that receives a detection signal of the hall device to switch the passing of a current through a coil of each phase;

    a PI control computing section for performing a PI computation based on a detection value of said hall device and a predetermined target value; and

    an excitation duty computing section for outputting a power source control signal for said brushless servo motor based on an output signal of the PI control computing section, characterized by that a load direction detecting section that detects said driven body moving near to a target position and outputs a signal for stopping switching phase of a current passing through said brushless servo motor to stop switching the phase of the current.

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