Abstract : This paper introduces the applications of linear motors in high-speed and ultra-high-speed machining, ultra-precision machining, and machining of irregular cross-sections. Keywords : Linear motor; Ultra-high-speed machining; Ultra-precision machining; Machining of irregular cross-sections 1 Introduction With the rapid development of electronic technology and the emergence of high-speed, multi-functional, or dedicated microprocessors and signal processors (such as DSPs), the application of linear motors in the machine tool field has reached its peak. From the 1996 International Machine Tool Show (IMTS'96) in Chicago, the 18th International Machine Tool Show in Japan, to the 1999 EMO International Exhibition in Paris, and other influential international exhibitions, internationally renowned companies such as Ingerellmilling (USA), Siemens (IFNI) (Germany), Sansei (Japan), and Kollmorgen (USA) have demonstrated the powerful appeal of linear motors in various machine tools, indicating that a new era for linear motors has arrived. [b]2 Applications in the Machine Tool Field 2.1 Applications in High-Speed ​​and Ultra-High-Speed ​​Precision Machining[/b] High-speed and ultra-high-speed machining, developed to improve production efficiency and the quality of machined parts, has now become a major trend in machine tool development. A responsive, high-speed, and lightweight drive system needs to achieve speeds of 40-50 m/min or higher, and acceleration and deceleration also need to be increased to 25-50 m/s. The traditional "rotary motor + ball screw" transmission method is obviously not feasible, which is determined by its inherent weaknesses. The existence of intermediate transmission links firstly reduces stiffness, and elastic deformation can increase the order of the system, thereby reducing the robustness of the system and decreasing servo performance. Elastic deformation is also the root cause of mechanical resonance in CNC machine tools. Secondly, the existence of intermediate transmission links increases the inertia of the moving body, making the displacement and speed response slower. In addition, factors such as gap dead zones, friction, and error accumulation mean that the highest feed speed that this traditional method can achieve is 30 m/min, and the acceleration is only 3 m/s.[sup]2[/sup] [b][align=center]For details, please click: Application and Prospect of Linear Motors in Machine Tools[/align][/b]