CNC milling machine spindle is driven by the spindle motor. CNC system through the control of the spindle motor to achieve the control of the spindle. At present, CNC milling machine spindle motor commonly used three-phase AC asynchronous motor and variable frequency drive.
Spindle motor drive has two configurations: First, the ordinary three-phase AC asynchronous motor and inverter; Second, the CNC system supporting the spindle motor and spindle drive. The former is often used in ordinary CNC milling machine, to achieve frequency control, positive, reverse start and stop and other basic control; the latter for multi-function CNC milling machine, in addition to the basic control of the spindle, but also to achieve orientation, positioning and spindle servo control.
Ordinary three-phase AC induction motor is consist of stator and rotor, as shown.
The stator includes a base, stator core and stator three-phase windings. The stator core is made of silicon steel sheet, and the inner circumference is covered with a coil groove. The coil groove is fitted with three symmetrical windings. The winding terminal is introduced into the junction box on the base frame and can be connected into a triangular winding or star winding. Made of silicon steel sheet stacked, the outer circumference are covered with a coil groove, coil groove cast with aluminum guide bar.
Ordinary asynchronous motor rotor is also installed on the cooling fan, when the ordinary three-phase AC asynchronous motor with the inverter speed, and the rotor speed is low, the cooling fan air volume is not enough to cool the motor, the motor easy to heat, serious will damage the stator winding insulation, resulting in short circuit. In order to meet the needs of frequency control, the development of a special frequency asynchronous motor, as shown. Frequency conversion special asynchronous motor has a special cooling fan motor, the motor body for forced cooling, fan motor power supply alone, the fan air flow and the motor speed has nothing to do. In addition, the frequency conversion asynchronous motor also improves the insulation performance of the stator winding, some frequency conversion special asynchronous motor stator winding is also embedded in the thermistor, for the motor temperature detection.
The above is the introduction about CNC milling machine spindle motor structure, welcome you continue to pay attention to the updated content.