CONTROL DEVICE, MACHINE TOOL, CONTROL METHOD, AND COMPUTER PROGRAM
The control device addresses the issue of sudden acceleration changes by switching from torque control to position control before reaching the target speed, effectively reducing vibrations and enhancing control stability in machine tools.
JP7647248B2Active Publication Date: 2025-03-18BROTHER KOGYO KK
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Patent Information
- Application Number
- JP2021061730
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2021-03-31
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2041-03-31
AI Technical Summary
Technical Problem
When switching from torque control to position control in machine tools, sudden changes in acceleration can occur, leading to vibrations.
Method used
A control device that includes a torque control unit, a speed obtaining unit, a time calculation unit, a decision unit, and a switching unit to determine if the arrival time is below a predetermined reference time, and if so, switches control from torque control to position control before reaching the target speed.
Benefits of technology
This approach suppresses sudden changes in acceleration by switching to position control before reaching the target speed, thereby reducing vibrations and improving control stability.
✦ Generated by Eureka AI based on patent content.
Abstract
To provide a control unit, a machine tool, a control method, and a computer program that can prevent a sudden change in acceleration during switching from a torque control to a position control.SOLUTION: A control unit controls a motor that drives a holding unit for holding a workpiece. The control unit comprises: a torque control unit that controls the speed of the motor based on a torque command indicating a target torque; a first calculation unit that calculates the speed of the motor; a second calculation unit that calculates a reaching time being the time required for the speed calculated by the first calculation unit to reach the target speed; a determination unit that, during the control performed by the torque control unit, determines whether the reaching time derived by the second calculation unit is equal to or less than a predetermined reference time; and a switching unit that, when the determination unit determines that the reaching time is equal to or less than the reference time, switches speed control of the motor from the control performed by the torque control unit to control performed by a position control unit that controls the speed of the motor based on a position command indicating a target position.SELECTED DRAWING: Figure 4
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