The types of VFD can be classified in many ways, according to the control mode into:
Vector control variable frequency drive:
It has higher control accuracy and better low-speed performance, and can achieve quick start and stop. It is widely used in industries that require high-precision control, such as wind power generation, elevators, steel and metallurgy.
Direct torque control type variable frequency drive:
It realizes the speed and torque control of the motor by controlling the input voltage and frequency of the motor. The control accuracy and stability are generally moderate, and it is commonly used in applications that do not require high-precision control, such as fans, pumps, air conditioners, etc.
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