AWSX1686 GRM+ Memberand SuperDork
10/10/19 10:54 a.m.

So I went up to Fall Carlisle last weekend and brought home this old belt sander. It is setup for three phase electric, and as you might imagine, I do not have three phase electric at home. 

I figure I have two options:

1. Swap the motor for a single phase motor. 

2. Buy a phase generator to adapt this three phase motor to run on single phase.


As I mentioned in the title, this is my first time messing with a 3 phase device, so any tips/links/tricks are much appreciated!




93gsxturbo SuperDork
10/10/19 12:47 p.m.

how many HP?  Under 2 or 3 run it on a frequency drive.  Thats the easy button.

Ian F
Ian F MegaDork
10/10/19 12:52 p.m.

What is the name plate on the motor itself. 

A 1-phase to 3-phase variable speed drive can definitely be an "easy button", but you need to be careful as it can burn out older motors not rated for inverter duty.

matthewmcl New Reader
10/10/19 1:00 p.m.

In reply to AWSX1686 :

It is also possible to split your 230 and run two phases of 115.  You limp along but everything still works.  I have a buddy who runs a lathe and a mill this way.  Your control box looks like it could run 10HP, but that seems scary in a benchtop belt sander.

Post the HP rating and see if anyone has something appropriate in a junk pile.



AWSX1686 GRM+ Memberand SuperDork
10/10/19 1:02 p.m.
93gsxturbo said:

how many HP?  Under 2 or 3 run it on a frequency drive.  Thats the easy button.

3HP. Got any info on the frequency drive?

Fueled by Caffeine
Fueled by Caffeine MegaDork
10/10/19 1:17 p.m.
Ian F
Ian F MegaDork
10/10/19 1:24 p.m.

Or this one: 220V-1 phase to 220V-3 phase converter

By Code, the above device needs to be installed and wired in a NEMA-1 enclosure.

Bearing in mind, 220V-1 phase is a 2-pole breaker in your electric panel.

Ethnic Food-Wrap Aficionado
Ethnic Food-Wrap Aficionado Dork
10/10/19 1:31 p.m.

In reply to AWSX1686 :

I have had good luck with the Automation Direct VFDs in the past for personal use (but I am fully a Yaskawa fanboi at work).  I have done a number of home shop installs with them on mills and lathes and have had no issues.  A 3hp "Durapulse" drive from them will set you back $360, but 3hp seems like a ton of power for a belt sander, frankly.  Under 5hp on single phase input, there is no need to derate the Durapulse stuff, despite what you might read elsewhere.  You might consider hucking a 1hp motor on it, which should still be plenty of poot.

Get us a picture of the motor nameplate.  I might be able to scrounge something up.

WonkoTheSane GRM+ Memberand SuperDork
10/10/19 1:39 p.m.
Ethnic Food-Wrap Aficionado said:


(but I am fully a Yaskawa fanboi at work). 

I'm with ya!  Yaskawa all the way when it's someone else's dime :)

AWSX1686 GRM+ Memberand SuperDork
10/10/19 6:24 p.m.

Found the motor nameplate. It must have been painted over in the past, so I used a scotchbrite pad to make the numbers a little more visible. 


Also, for reference it mounts by the output shaft with 4 bolts. 

stuart in mn
stuart in mn MegaDork
10/10/19 6:47 p.m.

The motor nameplate says it's 2hp.  Also note that it can be wired for operation on 440vac, so make sure it's connected correctly.

Jumper K Balls (Trent)
Jumper K Balls (Trent) PowerDork
10/10/19 10:46 p.m.

That mounting is known as a C face motor. 

I just installed the 360 dollar durapulse 3hp unit on a buddies mill. It was easy and fast. For your situation I would still look for a 2hp C face motor. Around here there are multiple industrial salvage places that would sell what you need for about 100.


Also look for motors on automation direct as well. They have great prices, fast shipping and  an excellent RMA policy 

AWSX1686 GRM+ Memberand SuperDork
10/11/19 7:44 a.m.

Ahh, I see the 2.0. Not sure where I got 3HP from, I guess that's what the seller told me. 

Is 1725 the RPMs then?


So I would be looking for a 2HP, 1725RPM, 220v, C Face Motor?

AWSX1686 GRM+ Memberand SuperDork
10/11/19 7:59 a.m.
Jumper K Balls (Trent)
Jumper K Balls (Trent) PowerDork
10/11/19 8:04 a.m.

As long as your existing shaft is 5/8" that should swap right in.  You want a single phase start stop switch as well



03Panther SuperDork
2/18/21 12:54 a.m.

The zombie piloted canoe almost got me again!

BTW, to tho OP... did you get this sander going?

AWSX1686 (Forum Supporter)
AWSX1686 (Forum Supporter) GRM+ Memberand UltraDork
2/18/21 9:34 a.m.

In reply to 03Panther :

I ended up selling it to someone who had three phase power already. Though, recently I did get a phase converter for cheap, so next time I'll be set. 

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