Functions and Advantages of Frequency Converters

2021-03-01

There are many advantages of the frequency converters, the following are detailed explanations of the four most important advantages.

1. The biggest advantage of frequency converters is energy saving

The most obvious is the application of the fan and water pump industry. The power consumption of the fan and water pump is proportional to the cube of the rotation speed. Therefore, when the external air/water consumption is not high, the frequency conversion can be used to reduce the rotation speed to have an obvious energy-saving effect. The principle of energy-saving in other industries is probably the same, which is achieved by reducing the speed of the motor when it is not required to operate at full speed.

2. Frequency converter can be soft-started, which can prolong its service life

It can produce 7 to 8 times the rated current of the motor when the motor is started directly by the power frequency. The increase of the current increases the electrical stress of the motor windings and generates heat, thereby the service life of frequency converter inverters will be reduced. The variable frequency speed control can be started at zero speed and zero voltage (or appropriately add torque boost).

3. Simplification of control system in frequency converters

The frequency control can start at zero speed and accelerate evenly according to the needs of users. In addition, the acceleration curve can be selected (linear acceleration, S-shaped acceleration or automatic acceleration). The operating speed can be adjusted based on the needs at any time, and it can be changed quickly based on the process. Also, the speed can be changed through remote control PLC or other controllers.

4. Frequency converters can reduce mechanical wear and tear

The motor or the connected mechanical part shaft or gear will produce violent vibration when starting through the power frequency. The vibration will further aggravate mechanical wear and tear, as well as reduce the life of mechanical components and motors. The stop mode can be controlled in the frequency conversion speed regulation, and there are different available stop modes (deceleration stop, free stop, deceleration stop + DC braking). It can reduce the impact on mechanical components and motors so that the whole system will be more reliable. In addition, it can increase the service life accordingly and improve the stability of the system.