Synchronous servo motor and asynchronous servo motor comparison - Database & Sql Blog Articles

Single chip microcomputer STM32L151CCU6

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SMD aluminum electrolytic capacitor

inductance

I think synchronous servo motors are just like a common AC motor. It is characterized by the relationship between the rotational speed of the rotor and the grid frequency during steady-state operation. n=ns=60f/p, ns becomes the synchronous speed. If the frequency of the grid is constant, the speed of the synchronous motor at steady state is constant and independent of the magnitude of the load, and the operating efficiency is high. This is very important,
The AC motor in the numerical control equipment is mainly a synchronous servo motor. The servo motor maintains a constant torque output between the minimum speed and the rated speed during operation.

Asynchronous servo motor, because its rotor winding current is induced, also known as induction motor. Asynchronous motors are the most widely used and most demanding types of motors.
The basic feature of the asynchronous motor is that the rotor winding does not need to be connected to other power sources, and its stator current is directly taken from the AC power system; it has a load characteristic close to constant speed, which can meet the requirements of most industrial production machinery dragging. The limitation is that its rotational speed has a fixed slip rate with the synchronous rotational speed of the rotating magnetic field, and thus the speed regulation performance is poor. In addition, when the asynchronous motor is running, reactive power is drawn from the power system to excite, which causes the power factor of the power system to deteriorate. Therefore, it is not reasonable to use a synchronous motor in high power and low speed applications. The asynchronous servo motor works in the constant power zone between the rated speed and the maximum speed. Due to the large speed range, the rated speed of the asynchronous servo motor is generally low.