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Forum topic by bons posted 05-23-2018 08:00 PM 1319 views 0 times favorited 7 replies Add to Favorites Watch
View bons's profile


80 posts in 2746 days

05-23-2018 08:00 PM

I need to convert 3 phase to single phase. The motor is a Robbins/ Myers 1.5 HP 3 phase motor. 1967 vintage.
APC quoted me a unit in $700.00 range. Ouch! VFD? Any recommendations based on experience with same conversion?

7 replies so far

View Loren's profile


10477 posts in 4456 days

#1 posted 05-23-2018 08:20 PM

I had an inexpensive VFD from Asia off ebay
for awhile. I think the machine I ran it on
is about 2hp. The VFD wasn’t difficult to wire
up but the operating instructions were difficult
to understand.

When I got my second 3 phase machine I built
a 5hp rotary converter for about $300 using a
Phase-craft panel. I was concerned the VFD
wouldn’t hold up anyway so I sold it.

View TheFridge's profile


10859 posts in 2294 days

#2 posted 05-24-2018 06:42 PM

I wouldn’t hesitate to use a VFD. I’d rather buy a TECO VFD than an Asian made but someone told me they have all the same major parts. Can’t confirm. The tech has come a long way in the last 10 years.

If you need more then one machine. Rotary phase converter.

If losing 1/3 HP of the motor won’t affect your work. Static phase converter.

If you need one machine. VFD.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View darthford's profile


612 posts in 2732 days

#3 posted 05-24-2018 09:33 PM

Why not purchase a new Made in USA Baldor single phase motor? Price them through a local motor shop, they sell for a lot less than the list price. I think the last three I purchased were all under $500 and I buy the heavy duty cast iron motors.

View bons's profile


80 posts in 2746 days

#4 posted 05-24-2018 11:18 PM

I have thought about the new motor option. Lot to think about to make right decision. I am picking up a 50’s Oliver 129A lathe next week with 3 phase motor. So I will have 2 3 phase in my shop. Want to make the best technical and economy decision.

View HerbC's profile


1805 posts in 3667 days

#5 posted 05-25-2018 01:20 AM

With two or more 3 phase machines you should seriously consider a rotary phase converter, sized to handle the largest load you plan to have…

Good Luck!

Be Careful!


-- Herb, Florida - Here's why I close most messages with "Be Careful!"

View Loren's profile


10477 posts in 4456 days

#6 posted 05-25-2018 01:25 AM

Well, if the transmission on the lathe is in
good order you can run it fine on a rpc. If
the transmission is broken a vfd can be used
to work around fixing it.

View bons's profile


80 posts in 2746 days

#7 posted 05-25-2018 01:38 AM

Thx Herb. I am 66. I grew up in a home with a basement full of “Delta Rockwell” power tools and the sights and sounds contained within. I have never been injured but just a couple of weeks ago, after fooling with my jointer’s in and out table feed, I walked away not remembering I had adjusted one and not the other. I subsequently had a kickback off that jointer that would have killed anyone in its path. I have grandchildren and for a second visualized one of them standing off to the side watching me and being hit flush with the kickback. We all can make a stupid mistake and hurt ourselves, or worse, someone else. Thx for sharing? Stay safe!

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