Frequency converter is a power control equipment that uses frequency conversion technology and microelectronics technology to control AC motor by changing the working power frequency of motor. Frequency converter plays an important role in specific applications. What are the main functions of frequency converter? This article will give you a specific introduction.

1. Energy saving effect of frequency converter

The biggest advantage of frequency converter is energy saving. The most obvious industry is the application of fan and water pump industry. Because the power consumption of fan and water pump is directly proportional to the cube of speed, when the external air / water consumption is not high, using frequency conversion to reduce the speed has obvious energy-saving effect. The energy-saving principle of other industries is roughly the same. Energy saving is realized by reducing the motor speed when full speed operation is not required.

2. Soft start function of frequency converter

What is the function of frequency converter

When the motor is directly started by power frequency air, it will produce 7 to 8 times of the rated current of the motor. The increase of the current increases the electrical stress of the motor winding and generates heat, thus reducing the service life of the frequency converter. Variable frequency speed regulation can be started at zero speed and zero voltage (torque can also be added appropriately).

3. Function of frequency converter control system simplification

Variable frequency speed regulation can start at zero speed and accelerate evenly according to the needs of users, and its acceleration curve can also be selected (linear acceleration, S-shaped acceleration or automatic acceleration). The running speed can be adjusted at any time according to the needs, and can be changed rapidly according to the process. The speed change can also be realized through remote control PLC or other controllers.

4. Function of frequency converter in reducing mechanical wear and loss

When starting through power frequency, it will produce violent vibration to the motor or connected mechanical shaft or gear. This vibration will further aggravate mechanical wear and loss and reduce the service life of mechanical components and motors. In variable frequency speed regulation, the stop mode can be controlled, and different stop modes can be selected (deceleration stop, free stop, deceleration stop + DC braking). It can reduce the impact on mechanical parts and motors, make the whole system more reliable, increase the service life accordingly, and improve the stability of the system at the same time.

5. Adjustable torque limit function of frequency converter

After variable frequency speed regulation, the corresponding torque limit can be set to protect the machinery from damage, so as to ensure the continuity of the process and the reliability of the product. The current frequency conversion technology makes not only the torque limit adjustable, but also the torque control accuracy can reach about 3% ~ 5%. In the power frequency state, the motor can only be controlled by detecting the current value or thermal protection, but can not set the accurate torque value to act as in the frequency conversion control.

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