Quantitative Feedback Control of Linear Motor for Wood Cutting CNC Machine Tools Based on Model Parameter Identification

Abstract

High speed and high precision wood cutting CNC machine tools not only need high repeat
positioning accuracy and low-speed motion stability, but also need high feed speed and
acceleration and deceleration. Although the linear motor feed system saves the intermediate
transmission link, the load and other external interference directly act on the linear motor, which
makes the control of linear motor more difficult. In this paper, the model parameter
identification method is used to control the linear motor together with the driver, and on this
basis, the system model is established. In order to improve the positioning accuracy of linear
motor feed system, the motion control of the system is studied. In this paper, quantitative
feedback control is applied to linear motor and used as the driving device of machine tool feed
system. The grating ruler is used as the feedback element, and the torque control mode is
adopted to control the experimental linear motor. The experimental results show that the
maximum acceleration of the linear motor direct feed system can reach 5g.