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VFD's vary the frequency of an AC motor to vary the speed. You must use a 3 phase motor. Some VFD's require 3 phase in. Many will accept 220 single phase in and output 3 phase. I think I have seen some accept 110 single phase in and put out 220 3 phase.wally318 wrote:Can anyone here answer a couple questions re: VFD?
From what I understand VFD is to AC what variable speed drives are to DC.
Can a VFD work with a single phase motor or just 3 ph.?
I have no hands on experience with them other than using friends machinery with them. They work very well and will be installing one shortly on a 9x49 milling machine running off a 220v generator.
I think once you experience it, there is no going back to single phase or dc motors.
I have five Teco FM50 VFD's to allow me to run 3ph machines off single phase 220v. They not only give variable speed but soft start, braking and the switching on/off. A switch between the VFD and motor is a no-no. Very happy with them.