I want to build a 3ph converter

[alltoys]

I need to build a converter to run a 5hp 3 phase motor on my new old lathe.

Some that I have seen start at $3000 and go up from there. There must be a way to build one for far less moneys.

 

[Brad_Blazer]

Just buy one for far less.
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Edit: Here is a Canadian source for Phase-a matic. See page 911 if their online catalog.
http://www.kbctools.com/can/main.cfm

 

[GPintheMitten]

I would buy rather than build, but a quick google search turned up this link but I can't vouch for it.

Building a Three Phase Converter

 

[SPIKER]

I would rather buy a inverter that way you can change the speed of the lath very easy... on the fly even...

FYI lots of inexpensive drives now in the 240 single phase to 3 phase...

Mark

 

[dex3361]

I would go with a VFD most Variable Frequency Drives can run 3 phase motors on single phase and can control speed as well.

 

[zzvyb6]

My 50kw pto Winco alternator has 3 ph as well as single phase 110 and 240 v capability. (Just in case a home/farm generator was in the budget plans...)

 

[Iplayfarmer]

The cheapest, easiest way in my opinion would be to repower the lathe with a single phase motor.
$133 + Shipping from Surplus Center...
https://www.surpluscenter.com/item.asp?UID=3152011911493752&item=10-2390&catname=electric

I'm sure there are other sources too where you could find the perfect motor.

 

[reddog176]

I believe what you are looking for is a rotary phase converter. Take a look at
Building a Three Phase Converter or just search google for rotary phase converter. You'll find lots of other hits.

 

[GE222]

Iplayfarmer - unfortunately, the motor that you picked is a 3450 RPM motor.
I am almost positive that an engine lathe will have a 1725 RPM motor. Also, if you go from a three phase to a single phase motor, the starter will have to be up sized due to the higher current rating.

The least expensive option is to consider a variable speed drive, (inverter). It will provide soft start as well as speed adjustments. Drive technology has advanced far enough to really lower the cost.

You should be able to pick up a 5hp drive that will take 230v single phase in and 230v three phase out for under $400.

 

[GPintheMitten]

I agree with Iplayfarmer...buy a new 5hp motor for $150 or so, and then sell the 3phase motor