company news

Safesav will explain the role of frequency converters to everyone.

1. Energy-saving effect of frequency converter

One of the biggest advantages of frequency converters is energy saving, and the most obvious industry is its application in the fan and water pump industry. Since the power consumption of the fan and water pump is proportional to the cube of the rotational speed, when the external wind/water consumption is not high, the energy saving effect will be obvious if the frequency conversion is used to reduce the rotational speed. The principle of energy saving in other industries is roughly the same. Energy saving is achieved by reducing the motor speed when full speed operation is not required.

2. Soft start function of frequency converter

When the motor is started by direct air from the power frequency, it will generate 7 to 8 times the rated current of the motor. The increase in current increases the electrical stress on the motor windings and generates heat, thereby reducing the service life of the inverter. The variable frequency speed regulation can start at zero speed and zero voltage (torque boost can also be added appropriately).

3. The role of simplifying the inverter control system

The variable frequency speed regulation can start at zero speed and accelerate evenly according to the user's needs, 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 as needed and can be quickly changed according to the process. Speed changes can also be achieved through remote control PLC or other controllers.

4. The role of frequency converter in reducing mechanical wear and loss

When started by power frequency, severe vibration will occur to the motor or connected mechanical parts, shafts or gears. This vibration will further increase mechanical wear and tear and reduce the life of mechanical components and motors. In the variable frequency speed regulation, the stopping method can be controlled, and there are different stopping methods to choose from (deceleration stop, free stop, deceleration stop + DC braking), which can reduce the impact on mechanical components and motors, thereby making the entire system more efficient. Reliable life will also be increased accordingly, while system stability is improved.

5. Adjustable torque limit function of the frequency converter

After frequency control, the corresponding torque limit can be set to protect the machinery from damage, thereby ensuring 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 reaching about 3% to 5%. Under the power frequency state, the motor can only be controlled by detecting the current value or thermal protection, but cannot set a precise torque value to operate like in variable frequency control.

This article can only lead you to a preliminary understanding of frequency converters. I hope it will be of some help to you. At the same time, continuous summary is needed to improve professional skills. You are also welcome to discuss some knowledge points in the article.