A Variable Frequency Drive (VFD) is a kind of motor controller that drives an electric motor by changing the frequency and voltage provided to the electric motors. Frequency (or hertz) is straightforwardly identified with the motor’s speed (RPMs).
Stepper motors convert electricity into the rotation. And it can be very accurately controlled in terms of how far it will rotate and how fast. Stepper motors are so named because each pulse of electricity turns the motor one step. Stepper motors are controlled by a drive.
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