Abstract
With the development of science, machine tools, manual machine tools have been developed from the past into the automatic machine tools; CNC machine tools are now widely used. CNC vertical lathe CNC products are the major domestic and foreign demand is also very large. A key part of its precision is reflected in the control of the spindle. This design is the German company SIEMENS PLC S7-200, as the main controller; German company SIEMENS 6RA7075 DC converter, Z4 DC motor comprising DC converter, DC speed control for efficient and accurate machine tools of various spindle control, and gives the electrical diagrams and instructions. The design of simple control, to achieve powerful, wide speed range, torque, strong overload capacity. Can be applied to heavy-duty vertical lathes, heavy duty vertical lathe spindle to improve the control precision, and thus guarantee its accuracy.
Keywords: CNC Vertical Lathe; DC converter; Programmable Controller; Spindle motor;