An overview of how frequency inverter works

We usually refer to the device that converts alternating current with constant voltage and frequency into alternating current with variable voltage or frequency as "frequency inverter". A frequency inverter can also be defined as follows: VFD (Variable-frequency Drive) is a power control device that uses frequency conversion technology and microelectronics technology to control the AC motor by changing the frequency of the motor's working power supply.

The working principle of AC frequency inverter is generally:

1. Convert three-phase or single-phase alternating current to direct current (DC)

2. Convert direct current (DC) to three-phase or single-phase alternating current (AC).

3. The inverter changes the output frequency and voltage at the same time, that is, the n0 on the motor running curve is changed, so that the motor running curve moves down in parallel.

Therefore, the inverter can make the motor obtain a larger starting torque with a smaller starting current, that is, the inverter can start a heavy load.

At the same time, the frequency inverter has basic functions such as voltage regulation, frequency regulation, voltage regulation and speed regulation, and applies modern science and technology. The price is generally relatively high, but it has certain advantages in performance. The internal structure of the frequency converter is relatively complex but It is easy to use, so the frequency inverter is not only used to start the motor, but can be widely used in many fields, such as the chemical industry, plastic machinery, paper machinery, injection molding machine energy saving and boiler frequency conversion speed regulation and other fields.

The term AC drives covers a wide range of drive types. When talking mostly industrial terms, an AC drive could also be considered a variable frequency drive (VFD), adjustable-speed drive (ASD), variable-speed drive (VSD), and “inverter.”

Xichi Electric provides low-voltage AC Drives and high-voltage (6KV, 10KV) frequency conversion devices for users to choose. Suitable for a variety of loads: fans, pumps, elevators and belt conveyors, etc.