Virtual Axis CNC Machine Tool Based on Decoupled Drive Compensator Design
2026-04-06 06:08:02··#1
Abstract: Using linear motors to drive virtual axis machine tools can meet the requirements of dynamic response and improved accuracy at high speeds. Servo drives for virtual axis machine tools have always been a challenge in control theory and implementation technology due to the influence of strong coupling. A novel precise positioning control strategy is proposed. This strategy can achieve continuous dynamic positioning even in the event of one or more axis control failures. By resetting the decoupling matrix online, it can be ensured that the closed loop can continue to operate normally even when one or more drivers fail. Furthermore, an interference compensator is designed based on the decoupling control. Simulation results show that this control strategy can effectively suppress various disturbances and greatly improve speed response characteristics. Keywords: Linear motor; Virtual axis machine tool; Decoupling; Dry-pull compensator The emergence of virtual axis CNC machine tools is considered the most revolutionary breakthrough in machine tool design history this century. Taking the Urane CNC machine tool produced by Renault Automation in France as an example, this machine tool requires three or four factors to improve its dynamic characteristics, which means that the acceleration needs to reach 35 m/s² to 50 m/s². Only parallel mechanisms can achieve such values while maintaining light motion mass and high stability. Renault Automation chose the Delta structure in the parallel mechanism, achieving a transverse feed rate of 100 m/min and an acceleration of 35 m/s² (or even 50 m/s²). This demonstrates that virtual axis machine tools using this parallel mechanism can meet the needs of the growing high-speed machining industry. Using linear motors as the drive device for virtual axis machine tools represents another true revolution. Linear motors eliminate the need for rotary motors and mechanical transmission devices (ball screw pairs, racks, etc.) to convert rotary motion into linear motion, enabling direct drive. Structurally, it combines the transmission and execution elements of a linear displacement mechanism, possessing high static and dynamic stiffness. This transmission device has significant technical characteristics: unlimited maximum displacement, a maximum speed of 150 m/min, and an acceleration of up to 50 m/s². Furthermore, the linear motor transmission device ensures high precision in the feed mechanism. [b][align=center]For more details, please click: Compensator Design for Virtual Axis CNC Machine Tools Based on Decoupling Drive[/align][/b]