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What are the main roles of frequency converter

2023-02-08

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 the motor. In the specific application of frequency converter plays an important role, so what are the main roles of the specific frequency converter? This article will give you a specific introduction.

1. Energy-saving effect of frequency converter

One of the biggest advantages of frequency converter is energy saving, the most obvious industry is the application of fan and water pump industry. Because the power consumption of the fan pump is proportional to the cube of the speed, so when the external wind/water is not high, the use of frequency conversion will reduce the speed of energy saving effect is obvious. The principle of energy saving in other industries is roughly the same, which is achieved by reducing the motor speed when it does not need to run at full speed.

2. Soft starting effect of frequency converter

When the motor is started by direct gas through the power frequency, 7 to 8 times the rated current of the motor will be generated. The increase of the current increases the electrical stress of the motor winding and generates heat, thus reducing the service life of the converter. And frequency control can be started at zero speed and zero voltage (can also be appropriate to increase the torque).

3. The role of simplification of inverter control system

Frequency control can start at zero speed and accelerate evenly according to the needs of users, and its acceleration curve can be selected (linear acceleration, S-shape acceleration or automatic acceleration). The running speed can be adjusted at any time according to the need, and can change rapidly according to the process, but also through remote control PLC or other controllers to achieve speed change.

4. The effect of frequency converter on reducing mechanical wear and loss

And through the power frequency to start the motor or connected to the mechanical part of the shaft or gear will produce violent vibration. This vibration will further exacerbate mechanical wear and loss, reducing the life of mechanical components and motors. The stopping mode can be controlled in frequency conversion speed regulation, and there are different stopping modes to choose (slow down stop, free stop, slow down stop + DC brake), it can reduce the impact on the mechanical parts and motor, so that the whole system more reliable life will increase correspondingly, and improve the stability of the system.

5. Adjustable torque limit effect of frequency converter

The corresponding torque limit can be set after frequency control 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 not only makes the torque limit adjustable, even 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, and cannot be operated by setting the precise torque value as in the frequency conversion control.

On the question of frequency converter, this paper focuses on the role of frequency converter, in fact, the role of frequency converter is more than these, it is because the role of frequency converter is so obvious, so its application will be so wide.

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