Numerically controlled machine tools, referred to as CNC machine tools for short, are mechatronic products that have integrated mechanical, electrical, hydraulic, pneumatic, microelectronics and information technologies for 30 years. The spindle and each feed system are driven by their respective motors. With the development of frequency conversion speed regulation technology, the spindle of the CNC machine tool is driven by the frequency converter, which can well meet the work needs. Qidian frequency converter D32 has a wide range of applications in CNC machine tools, and has achieved good economic and social benefits.