Variable-frequency drives control motor speed by controlling the frequency of the power supplied to the motor.

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Variable-frequency drives (VFDs) are electronic devices that control motor speed by varying the frequency of the alternating current (AC) power supplied to the motor. By changing the frequency, VFDs can adjust the speed of the motor and match it to the specific application requirements. Variable-frequency drives (VFDs) use electronic devices called inverters to convert the incoming AC power to DC power, and then back to variable-frequency AC power at the desired frequency to control the speed of the motor. The higher the frequency, the faster the motor spins, and the lower the frequency, the slower the motor spins. Therefore, VFDs can precisely control the motor speed by adjusting the output frequency of the drive.

Variable-Frequency Drives Control Motor Speed by Controlling the Frequency of the Power