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MOTOR CONTROLLER DETECTING ABNORMALITY OF POWER TRANSMISSION UNIT BETWEEN MAIN SPINDLE AND MOTOR

  • US 20150115855A1
  • Filed: 10/27/2014
  • Published: 04/30/2015
  • Est. Priority Date: 10/30/2013
  • Status: Active Grant
First Claim
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1. A motor controller detecting an abnormality in a power transmission unit that connects a motor and a main spindle of a machine tool and has a known speed reduction ratio, the motor controller comprising:

  • a single-rotation signal detector detecting a single-rotation signal that indicates a single rotation of the main spindle;

    a rotation angle detector detecting a rotation angle of the motor every predetermined time;

    a counter adding up the rotation angle detected by the rotation angle detector every predetermined time, a value of the counter being reset when the single-rotation signal detector detects the single-rotation signal of the main spindle; and

    a judgment unit judging that the power transmission unit has an abnormality when a value of the rotation angle of the motor added up in the counter deviates from a predetermined range.

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