AC motor drives are electronic drive circuits that provide speed control by changing the frequency and voltage of the supply source of asynchronous motors. AC motor drives, which are frequently used in the industry, have been named with different names such as speed control drive, frequency drive, inverter, AC drive.
When the operating principles of AC motors are examined, it can be seen that the supply frequency is a parameter that directly affects the speed of the motor. In other words, as the frequency decreases, the motor speed decreases, the higher the frequency, the higher the motor speed. AC motor drives are used if a motor is not desired to run at its rated speed in the industry, or if it is desired to run at a lower speed or if speed control is desired for the motor according to certain variables.