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Electric Motor Driven Systems: Options - Variable Speed Drives

The term Variable Speed Drives (VSD) is synonymous with variable frequency drive (VFD), pulse width modulated drive (PWMdrive), adjustable speed drive (ASD) and adjustable frequency drive (AFD). These very fast switching power transistors generate a variable-voltage, variable-frequency waveform that changes the speed of the motor. As the speed is reduced, input power is reduced substantially because the power required varies as the cube of the speed.

Example: