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MOTOR CONTROL DEVICE

  • US 20160327932A1
  • Filed: 11/26/2014
  • Published: 11/10/2016
  • Est. Priority Date: 01/23/2014
  • Status: Active Grant
First Claim
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1. A motor control device that controls a first motor coupled to a first load machine in a first control target and that controls a second motor coupled to a second load machine in a second control target, the motor control device comprising:

  • a first detector to detect a position of the first motor;

    a second detector to detect a position of the second motor;

    a trajectory command generator to output a first position command that is a position command for the first control target and a second position command that is a position command for the second control target;

    a first response corrector to carry out a calculation to apply a first response correction filter to the first position command from the trajectory command generator so as to output a corrected first position command;

    a first position controller to receive the corrected first position command from the first response corrector and a position detected by the first detector so as to generate a first torque command such that the position detected by the first detector matches the corrected first position command;

    a second position controller to receive the second position command from the trajectory command generator and a position detected by the second detector so as to generate a second torque command such that the position detected by the second detector matches the second position command;

    a measuring instrument of the second load machine that detects machine end displacement of the second load machine in the second control target;

    a zero-point estimator of the second control target that extracts information of a polynomial expression of a transfer function representing characteristics of a zero point of a transfer function from the second torque command to the machine end displacement of the second load machine, as characteristics of the zero point of the second control target, on the basis of the second torque command and the machine end displacement of the second control target detected by the measuring instrument of the second load machine or on the basis of the second position command and the machine end displacement of the second control target detected by the measuring instrument of the second load machine; and

    a response-correction-parameter determiner to set the first response correction filter of the first response corrector by using the information of the polynomial expression of the transfer function representing the characteristics of the zero point of the second control target extracted by the zero-point estimator of the second control target, whereinthe first torque command generated by the first position control unit is input to the first motor, andthe second torque command generated by the second position control unit is input to the second motor.

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