VFD question

Topics include, Machine Tools & Tooling, Precision Measuring, Materials and their Properties, Electrical discussions related to machine tools, setups, fixtures and jigs and other general discussion related to amateur machining.

Moderators: Harold_V, websterz, GlennW

Post Reply
wally318
Posts: 116
Joined: Sun Jun 05, 2011 1:06 am
Location: Kelowna, British Columbia

VFD question

Post by wally318 » Sun Feb 05, 2012 4:48 pm

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.?

WJH
Posts: 1420
Joined: Sat Jan 16, 2010 9:29 pm
Location: Florida

Re: VFD question

Post by WJH » Sun Feb 05, 2012 5:59 pm

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.?
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.

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.

MoreOldIron4Me
Posts: 34
Joined: Sun Apr 18, 2010 3:06 pm
Location: Southern, ME USA

Re: VFD question

Post by MoreOldIron4Me » Sun Feb 05, 2012 7:13 pm

Just 3 phase, but they work great for that!

woodcutter
Posts: 7
Joined: Tue May 03, 2011 12:41 pm

Re: VFD question

Post by woodcutter » Tue Feb 07, 2012 11:03 am

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.
http://www.factorymation.com/s.nl/sc.2/category.11/.f

Post Reply