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Drive motors can be divided into three major categories: reactive stepper drive motors, hybrid (also known as permanent magnet reaction) stepper drive motors and servo drive motors. Reactive stepper drive motor rotor without windings, by the excitation of the stator windings generate reaction torque to achieve stepping operation. The permanent magnet for the rotor of the hybrid stepper motor is stepped by the electromagnetic torque generated by excitation and permanent magnets. The stepper motor is controlled by pulses. The direction of rotation of the motor can be changed by changing the order of energization. Changing the frequency of the pulse can change the rotation speed of the motor. The stepper motor has a certain step accuracy and there is no cumulative error. However, the efficiency of the stepping motor is low, the ability to drag the load is not large, the pulse equivalent can not be too large, and the speed range is not large. At present, stepping motors can be divided into two phases, three phases, and five equal ones. Usually, five-phase stepping motors are used. In the past period of time, stepper motors accounted for a large market, but are currently being replaced by servo motors.
At present, the commonly used servo motor is an AC servo motor, and an optical encoder is installed at the shaft end of the motor, and the angle of the rotor is used for frequency conversion control. From the lowest speed to the highest speed, the servo motor can run smoothly with small torque ripple. The servo motor has a long overload capacity, a small moment of inertia and a large stall torque. The servo motor has a very small starting frequency and can quickly accelerate from the lowest speed to the rated speed.
Which can be divided into several categories
The medium thread cutting drive unit includes a drive device and a motor. Therefore, the purchase of the drive unit mainly depends on the selection of the drive device. Because the motor is a common component, the performance difference exists only in different manufacturers and different models.