AC Drives also known as Inverters, Variable Speed Drives (VSDs), Variable Frequency Drives (VFDs), and Frequency Converters) are used to control AC Induction motors.

If an AC motor is connected directly to the mains supply, it will accelerate quickly and then rotate at a fixed speed which is dependent upon the electrical supply frequency and the motor design. An AC drive allows the speed of the motor to be varied. By varying the motor speed of fans, pumps and compressors using an AC Drive substantial energy savings can be made.

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