In the CNC milling machine feed servo system, the feed motor drives the ball screw to realize the feed drive, and the drive which matches the feed motor receives the control signal of the numerical control system, and supplies the power supply to the feed motor by the power amplification so that the feed motor output torque, speed and angular displacement. At present, CNC milling machine closed-loop or semi-closed-loop servo system used in the feed motor and drive is usually AC servo motor and servo drive, open-loop servo system used to feed the motor and drive into the stepper motor and stepper drive.
CNC milling machine servo motor through the early DC servo motor, brushless DC motor, the development of the current three-phase AC sine wave permanent magnet synchronous motor. The current use of CNC milling machine AC servo motor is usually referred to as three-phase AC sine wave permanent magnet synchronous motor. The picture shows the appearance and setting of the FANUC AC servo motor.
AC servo motor stator without frame. Stator core is made of silicon steel sheet, the stator shape is polygonal; stator core coil groove embedded with three symmetrical winding, through three-phase AC power; in addition, the stator winding embedded in the thermistor, the motor temperature detection, to achieve overload and over current protection. The AC servo motor rotor consists of a rotor core and a permanent magnet. The rotor core is made of silicon steel sheet, the permanent magnet is NdFeB permanent magnet material, or laying on the rotor core surface (surface type or convex type), or embedded in the rotor core slot (built-in type). In addition, the AC servo motor rotor coaxially coupled encoder or rotary transformer, used to detect the servo motor speed and angular displacement.
Above is the basic introduction of the CNC milling machine servo motor development process and the composition, you are welcome to continue to pay attention.