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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