What are the differences between a variable frequency drive (VFD) and a variable speed drive (VSD)?

Variable Speed Drives
The ‘Easy’ Guide to Variable Speed Drives

The ‘Easy’ Guide to Variable Speed Drives

This Quick and Easy Guide is a must have for any engineer who uses Variable Speed Drives!

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A variable frequency drive (VFD) refers to AC drives only and a variable speed drive (VSD) refers to either AC Drives or DC Drives. VFDs vary the speed of an AC motor by varying the frequency to the motor. VSDs referring to DC motors vary the speed by varying the voltage to the motor.

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