There are many ways to change the s

There are many ways to change the speed of the main drive, but for CNC machine tools, the more used way is that DC spindle motor with a simple gearbox for stepless speed regulation. The main advantages of this speed control system are: stepless speed control to obtain the most favorable cutting parameters and the minimum relative productivity loss; shortening the speed change time; facilitating remote control and automatic control; greatly simplifying the gearbox; improving the transmission stability, etc. At this time, the motor itself has a wide range of speed regulation. Its low speed area is voltage regulation and speed regulation, which is from rated speed down to constant torque area, high speed area is magnetic regulation and speed regulation, which is from rated speed up to constant power area.