Electric motors are advanced and complex systems that rely on multiple components to generate power. Such complex systems need to be monitored, and the best way to keep an eye on an electric motor is with a speed drive. Some call this device a VSD or variable speed drive, while others call it a VFD or variable frequency drive. Although these are two separate devices, they do the same thing in a different way. But what do they do, though? Both these devices are used to help control the speed or voltage of electric motors.
