What is Frequency Inverter?

A variable frequency drive or frequency inverter is a type of motor that helps in controlling the drive of an electric motor by varying the frequency and voltage of its power supply. In addition, it also helps in controlling the engine start-up when starting it and shutting down when it is stopping.

Even though the drive controls the frequency and voltage of the power supplied to the motor, it is referred to as speed control because it can make adjustments in the speed of the motor. 

There are many sellers for frequency inverters in China but make sure you buy it from someone who has a good market reputation and provides you with sales services also. 

6 Benefits of Frequency Inverter

1. Adjustable Torque Limit 

The torque limit is set to protect the machine from damage, and to make sure the process continues and the reliability of the product remains intact. You can make adjustments in the torque limit as well as control the accuracy of the torque reaches about 3%-5%. In the power frequency state, the motor can be controlled by detecting the current value.

2. Controls Acceleration 

A frequency inverter starts at zero speed and it can smoothly accelerate on a customer-adjustable ramp. An AC motor that starts across the line is a tremendous mechanical shock both for the motor and connected load. This shock increases the wear and tear on the connected load and the AC motor. 

3. Saves Energy

Frequency Inverters work with the necessary power, rather than utilizing surplus energy. Using a fixed-speed motor requires a mechanical regulating device, such as a vane or damper. But these don't stop the motor from running at full load and full speed. Energy savings can be sufficient to pay back the capitalized cost depending on the size of the motor.

4. Reversible Operation Control

 There is no need for additional reversible control devices to realize reversible operation control; you can do that just by changing the phase sequence of output voltage. The output voltage can be used to reduce maintenance costs and save installation space.

5. Reduces Mechanical Transmission Components 

Vector control converter and synchronous motor help in achieving high-efficient torque output, which saves mechanical transmission components, such as gearboxes. This ultimately helps in constituting a direct frequency conversion drive system. It helps in saving cost and space and stability can also be improved.

6. Controllable Stopping Mode 

Just like controllable acceleration, you can also stop the frequency control system. It can be done with the help of different stopping modes such as decelerated parking, free parking, etc. It can also help in reducing the impact on mechanical components and motors and make the whole system more reliable.


Developments in frequency inverter technology are beneficial in maintenance and it is helpful to engineering managers as it allows them to look closer at the life-cycle costs and other potential benefits of this device. Another piece of equipment that is very beneficial is 3 phase solar pump inverter which converts DC power generated by solar panels into AC electricity just like any inverter.