Tormach has a pretty good white paper on why they chose to use 3 phase
steppers on their machines. I found it a great read for future reference
even though I was going to use servos anyway.

On another note... you can get E661 servos with encoders off of ebay for
$40 to your door and they are a great match for your Sheldon. Grab some
used servo drives for about $50 each depending on your power supply
situation. That is certainly cheaper than the 3 phase steppers that you
are looking at. Personally if I was to do 3 phase steppers, I would go
with the Leadshine stuff.

Just my $.10



On 02/06/2017 03:09 AM, Gene Heskett wrote:
> Greetings everybody;
> 
> I just spent an hour on wikipedia, and another hour reading everything 
> that google spits out on 3 phase stepper motors, and have not found a 
> convincing argument in favor of 2 phase, other than their ready 
> availability.
> 
> I can get off fleabay, 3 phase, 230 volt ac powered drivers in size & 
> voltages suitable to move this lathe with, for a big buck + an if it 
> fits box from the USPO. Those are here, on the left coast.
> 
> But no one on this side of either pond is stocking the 3 phase version of 
> the motors, and due to their weight, its 2 to 4 weeks, and another 56 
> bucks or so to get any of them because they are all in China, so an $80 
> nema 34 is about $140 on my front deck. Close to $250 an axis IOW.
> 
> So I need to see a decent discussion on the subject before I cut that big 
> a hole in the card.
> 
> Many thanks for any educational url's on the 3 phase motors you folks can 
> supply.
>  
> Cheers, Gene Heskett
> 

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