AC drive is a device used to control the speed of an electrical motor in order to:

Enhance process control.
Reduce energy usage and generate energy efficiently.
Decrease mechanical stress on motor control applications.
Optimize the operation of various applications relying on electric motors.

AC drives are well hidden, but nevertheless they play a major and very necessary role in modern, everyday life by making the world and our way of living more sustainable

We have various brands available in drive

ABB
Danfoos
Yaskawa
Allen bradley and many more