Motor control device
AssigneeFanuc Corporation
InventorsYuuki MORITA, Tadashi OKITA
Life of this patent
Estimating the term…
Abstract
A motor control device is a motor control device which controls a spindle motor of a machine tool, the device including: a low-pass filter which averages torque command values or drive current values of the spindle motor and calculates averaged load information of the spindle motor; and a time constant calculation unit which calculates, as a time constant of the low-pass filter, a first time constant based on a cut-off frequency according to the rotation number of the spindle driven by the spindle motor, or a second time constant based on a cut-off frequency according to a value produced by multiplying a of cutting tooth number of a tool by the rotation number of the spindle.
Claims7
A motor control device for controlling a spindle motor which rotationally drives a tool or workpiece in a machine tool, the motor control device comprising:
- a first low-pass filter which averages torque command values or drive current values of the spindle motor and calculates averaged first load information of the spindle motor;
- and
- a time constant calculation unit which calculates, as a time constant of the first low-pass filter, a first time constant based on a cut-off frequency according to a rotation number of the spindle driven by the spindle motor, or in a case of the spindle rotationally driving the tool, a second time constant based on a cut-off frequency according to a value produced by multiplying a number of cutting tooth of the tool by the rotation number of the spindle.
Dependencies are inferred from the claim text.