Abstract: This paper introduces the structural features and machining performance of the AQ35L EDM machine tool and the AQ550L wire electrode cutting machine tool equipped with linear motors. The AQ35L features high resolution and high-speed servo operation, high-speed jump, precision control, high response, and high-stability machining. Examples of the AQ35L's excellent machining performance are presented. The AQ550L features improved machining roundness, reduced striations, and improved finishing performance. Keywords : EDM, linear motor, AQ35L, AQ550L 1 Introduction Improving the machining quality, speed, accuracy, and shortening delivery time of molds has always been an important issue. To this end, Sodick, in its exploration of significantly improving machining performance and approaching ideal machining speeds, determined that linear motors possess the potential to achieve high precision, high response, low vibration, and high-speed machining. As is well known, traditional rotary motors require ball screws for speed reduction, while linear motors require higher power for drive. Currently, linear motors that meet these conditions are relatively expensive, limiting their practical application. To this end, Sodick began to match the appropriate motors to the actual requirements of EDM machines, and successfully developed a high-performance linear motor and its servo control system. This article will introduce the high-response and high-speed machining performance of the AQ35L EDM machine tool and the AQ550L wire electrode cutting machine tool equipped with linear motors. [b]2 EDM Machine Tool AQ35L 2.1 Main Body of the Machine Tool[/b] The linear motor driven EDM machine AQ35L, which won various new product development awards in 1999, uses linear motors on its three axes of x, y, and z, reducing the need for ball screws and rotary motors in previous machine tools. In addition to using linear motors, each axis also uses linear guides and grating rulers with high-speed response characteristics. In order to reduce the weight of the spindle components driven by the linear motor and reduce thermal deformation, Sodick's own precision ceramics are used. As shown in Figure 2, obliquely arranged high-density rare-earth permanent magnets are positioned on both sides of the spindle head to improve the pitch accuracy between the motor poles and maintain the stability of the pitch generated by the cogging effect torque. Because the linear motor is positioned on both sides, the mutual attraction of the magnets is further counteracted, thus maintaining the balance of the drive head and preventing the slide components from tilting, thereby achieving high linearity and smooth drive. [b][align=center]For more details, please click: Linear Motor Driven EDM Machine Tool[/align][/b]