Abstract: The mathematical model and control requirements of a permanent magnet AC synchronous linear motor are analyzed. Four typical position controllers are compared and studied, and the structure and parameters of the disturbance observer are improved. Based on this, an acceleration feedback position servo control system based on the disturbance observer is proposed. Theoretical analysis and simulation experiments prove that this control system is suitable for the control of permanent magnet AC synchronous linear motors. Keywords: Permanent magnet AC synchronous linear motor; Position servo control system; Position controller; Disturbance observer; PID position controller; PID position controller; Acceleration feedforward position controller; Acceleration feedback position controller. Permanent magnet AC synchronous linear motors can directly generate linear thrust. They have long stroke, large thrust, and fast response, making them the preferred motor type for constructing direct drive linear servo units. However, due to their direct drive characteristics, thrust fluctuations caused by end effects, cogging effects, and ripple effects, friction introduced by primary and secondary attraction forces and guide rail preload, and load forces during operation will have a significant impact on their control accuracy. Therefore, their position servo control system needs to be carefully designed. The position control system of a direct drive linear motor can adopt a 2-degree-of-freedom design scheme, designing the position controller and disturbance observer separately. We conducted a comparative study of PID position controllers, IP position controllers, acceleration feedforward controllers, and acceleration feedback controllers. We improved and optimized the disturbance observer proposed in the literature, and based on this, proposed an acceleration feedback position servo control system based on the disturbance observer. Simulation results show that this control system has excellent servo performance, meeting the set requirements in both fixed-point and continuous control. [b][align=center]For more details, please click: Design of Position Servo Control System for Permanent Magnet AC Synchronous Linear Motor[/align][/b]