The invention provides a servomotor controller that makes it possible to reduce compensation delay even when a dead band is provided. The servomotor controller includes a motion acquiring unit that acquires a motion of the servomotor, an acceleration amount acquiring unit that acquires an acceleration amount of the servomotor, a compensating unit that compensates a motion of the servomotor, and a compensation start determining unit that determines a start of the compensation by the compensating unit responsive to the motion of the servomotor, wherein the compensation start determining unit has a dead band unit that sets a dead band range which is a range of a predetermined value relative to the motion of the servomotor, and the dead band unit changes the dead band range based on the acceleration amount acquired by the acceleration amount acquiring unit.

The invention provides a servomotor controller that makes it possible to reduce compensation delay even when a dead band is provided. The servomotor controller includes a motion acquiring unit that acquires a motion of the servomotor, an acceleration amount acquiring unit that acquires an acceleration amount of the servomotor, a compensating unit that compensates a motion of the servomotor, and a compensation start determining unit that determines a start of the compensation by the compensating unit responsive to the motion of the servomotor, wherein the compensation start determining unit has a dead band unit that sets a dead band range which is a range of a predetermined value relative to the motion of the servomotor, and the dead band unit changes the dead band range based on the acceleration amount acquired by the acceleration amount acquiring unit.

A numerical controller includes one or more of a first reversing point detecting unit that detects a reversing point in an axis direction of a machine based on a machining program, a second reversing point detecting unit that detects a reversing point in the axis direction based on a position command, a third reversing point detecting unit that detects a reversing point in the axis direction based on a positional deviation or position feedback information of a servo control unit that controls a servomotor which drives the axis, and a fourth reversing point detecting unit that detects a reversing point in the axis direction based on positional information of a movable portion of the machine, and a drawing unit that generates an image superimposing a reversing point location detected by the one or more reversing point detecting unit on an image of a workpiece.

A servo motor controller for performing more precise machining by calculating an appropriate compensation amount for a servo motor even in the case where the servo motor performs a reversal or the like. The controller includes a command calculation part for calculating a command for a position or a speed of a servo motor, a determining part for determining that the servo motor is performing reversal or movement from stop, an acceleration calculation part for obtaining the acceleration of the servo motor based on the determination result, and a compensation amount calculation part for calculating a compensation amount for compensation of delay of the servo motor. The acceleration calculation part obtains the acceleration even after the servo motor performs reversal or movement from stop. The compensation amount calculation part calculates the compensation amount according to the obtained acceleration, even after the servo motor performs reversal or movement from stop.