Why is a frequency inverter needed?

Why is a frequency inverter needed?

The rotor speed of asynchronous electric motors is controlled by changing the frequency and amplitude of the supply voltage. A device designed to control the rotation speed of an asynchronous motor by changing the frequency of the supply voltage is called a frequency inverter.

Main functions of the frequency converter:

• Speed ​​regulation of a three-phase/single-phase asynchronous electric motor;
• Soft start, braking of a three-phase/single-phase asynchronous electric motor;
• Changing the direction of rotation of a three-phase/single-phase asynchronous electric motor.

A single-phase power frequency converter 230V (polar ratings 0.75kW, 1.5kW, 2.2kW) is used to control a single-phase or three-phase asynchronous motor.

Three-phase power frequency converter 380V (the most popular ratings are 0.75kW, 1.5kW, 2.2kW, 4.0kW, 4.0/5.5kW, 5.5/7.5kW, 7.5/11kW, 11/15kW, 15/18.5kW, 18.5/22kW, 22/30kW, 30/37kW, 37/45kW up to 400kW) is used to control a three-phase motor.

It is recommended to choose a frequency converter of the same power as the motor, often slightly more powerful, depending on where the frequency converter will be used (what process to control, how much the motor will be loaded, how the motor is connected in a triangle, star). It is important that the frequency converter is not less powerful than the motor! Therefore, we recommend that you consult us before purchasing a frequency converter, you can send requests by e-mail: info@automatikosprekes.lt or by phone +370 699 08112

We will provide practical examples of where a frequency converter is used.

• In the control of a powder coating chamber, when we want to automate painting processes.
• Frequency converter for a water pump. It has an integrated self-adaptive PID function module. Supports sleep and wake-up functions, can be switched by frequency and pressure. The FRECON frequency converter can control an artesian well water pump, has the ability to connect a pressure sensor.
• For wood pellet line automation;
• For waste shredder automation;
• Widely used for connecting: fans, conveyors, hoods, etc.