What is the difference between a vector inverter and an ordinary inverter?
There are differences between vector inverters and ordinary inverters in terms of control methods, performance characteristics, application scenarios, and prices, as follows:
control method
Vector inverter: Using vector control technology, the stator current vector of the AC motor is decomposed into excitation current and torque current, which are independently controlled to accurately control the magnetic flux and torque of the motor, making the motor control performance close to that of the DC motor.
Ordinary frequency converter: V/F control mode is mostly used, that is, the motor is controlled by maintaining the proportional relationship between the output voltage and the frequency. This method is simple and direct, but it cannot independently and accurately control the magnetic flux and torque of the motor.
performance characteristics
Speed regulation accuracy
Vector inverter: The speed regulation accuracy is very high, generally up to 0.1% or even higher, enabling accurate control of motor speed.
Ordinary frequency converter: The speed regulation accuracy is relatively low, usually around 1% to 5%, suitable for occasions where the speed regulation accuracy is not high.
Torque characteristics
Vector inverter: can output a large torque at low speed, and the torque control is accurate, can reach 150% – 200% of the rated torque, the motor is not prone to problems such as stalling.
Ordinary frequency converter: Low-speed torque output is relatively weak, and if the load is large, it may cause difficulty in starting or unstable operation.
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