AC motor is the most ideal speed control mode of frequency conversion, and other ways are electromagnetic speed regulation, variable pole speed regulation, variable pressure speed regulation.
The other is called magnetic transmission, and the cost performance is similar to that of the converter. But the principle is different. It is characterized by long life and little maintenance. It has been applied in the speed regulation of large motors. AC motor speed controller is simple and can be used for limiting the buck, governor as the electric fan, the speed control method is simple, but the load characteristics of the motor is very poor, only suitable for small motor load and stable situation.
Now is the best performance of AC motor speed controller frequency converter, it is by changing the power supply frequency of the motor to achieve speed, speed range, energy saving, but also can slow down growth, and can be used as motor starter, but the price is relatively high.
