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US 2020/0316743 A1Published application
Control apparatus of machine tool including spindle axis and feed axis
AssigneeFanuc Corporation
InventorsTakashi OKAMOTO, Yuuki MORITA
Life of this patent
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Abstract
A control apparatus of a machine tool including a feed axis, which is driven by a feed axis motor, includes a load torque estimation unit configured to estimate a load torque acting on a spindle motor, based on a torque command to the spindle motor which drives a spindle axis of the machine tool, and a speed of the spindle motor; and a speed control unit configured to control a speed of a feed axis motor such that the load torque estimated by the load torque estimation unit follows a prescribed load torque target value.
Claims3
A control apparatus of a machine tool, comprising:
- a load torque estimation unit configured to estimate a load torque acting on a spindle motor, based on a torque command to the spindle motor which drives a spindle axis of the machine tool, and a speed of the spindle motor;
- and
- a speed changing unit configured to change a speed of a feed axis motor such that the load torque estimated by the load torque estimation unit follows a prescribed load torque target value.
Dependencies are inferred from the claim text.