Motor drive control device for limiting output of motor
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United States of America Patent
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Apr 15, 2014
Grant Date -
Aug 1, 2013
app pub date -
Jan 11, 2013
filing date -
Jan 31, 2012
priority date (Note) -
In Force
status (Latency Note)
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Abstract
If it is predicted that the sum of the output of a servo motor and the output of a spindle motor exceeds power supplied by a rectifier unit, during a cutting operation, a motor drive control device controls alternating-current power of a first inverter unit so as to reduce the feed speed of at least one feed axis and controls alternating-current power of a second inverter unit so as not to limit torque of the spindle motor. Further, if it is predicted that the sum of the output of the servo motor and the output of the spindle motor exceeds power supplied by the rectifier unit, during an operation other than the cutting operation, the motor drive control device controls the alternating-current power of the second inverter unit so as to limit the torque so as not to reduce the feed speed.
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