What are the advantages of frequency converters?

2021-11-03 11:09:02 jact_elec

What are the advantages of frequency converters?

Before the frequency converter appeared, the speed regulation of the asynchronous motor was very troublesome. Now as long as the output of a frequency-controllable AC power supply, the speed of the three-phase asynchronous motor can be smoothly changed. This is the fundamental principle of the frequency converter.

There are many advantages of the frequency converter, here we choose the four most important to explain in detail.

1. One of the biggest advantages of the inverter is energy saving.

The most obvious industry is the application of fan and pump industry. Because the power consumption of the fan and water pump is proportional to the cube of the rotation speed, when the external air/water consumption is not high, the frequency conversion is used to reduce the rotation speed, and the energy saving effect is obvious.

The principle of energy saving in other industries is probably the same, all of which are achieved by reducing the motor speed when full-speed operation is not required.

2. It can be soft-started, save energy and extend the service life  

When the motor is started directly by the power frequency, it will generate 7 to 8 times the rated current of the motor. The increase of the current increases the electrical stress of the motor winding and generates heat, thereby reducing the service life of the inverter.

The frequency conversion speed regulation can start at zero speed and zero voltage (or torque boost can be added appropriately).

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3. Simplified control system  

The frequency conversion speed regulation can start at zero speed and accelerate uniformly 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 as needed, and can be changed quickly according to the technological process, and the speed can also be changed by remote control plc or other controllers.

4. Reduce mechanical wear and loss  

When starting through the power frequency, the motor or the connected mechanical part shaft or gear will produce violent vibration. This vibration will further aggravate mechanical wear and loss, and reduce the life of mechanical components and motors.

In frequency conversion speed regulation, the stop mode can be controlled, and there are different stop modes to choose from (deceleration stop, free stop, deceleration stop + DC braking), which can reduce the impact on mechanical components and motors, so that the entire system It is more reliable, and its service life will increase accordingly, which improves system stability.

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