Finally finished all the set screw holes, the 3mm grubs are just the right size, and I feel confident that things are
strong enough. I'll drill down into the lamination stack a millimeter or so, and that will lock everything in place.
I put an old core slug in it for show, but the new ones will be a little different size.
A little hard to see.
Took a photo of some 5mm phase wires,.. 15mm of wires should cary some juice! And theres plenty of room for more
holes for sensors and a thermal if need be. Thanks for your help amberwolf, that worked out nice.
View attachment 1
The weight as it sets is 1530 grams, or about 3.5 lbs, and the torque arms and bolts are another 150g's.
The next move would be the lamination stacks, but I've been holding off on that, because things keep changing,
and I want to be absolutely sure of the size. Plus, I'm not happy with putting heat to them with the plasma torch,
and I'm holding out for a horizontal band saw, which I think will be the ticket. Craigslist is not being cooperative
at the moment, and I'm to cheap to just go out and buy a new one. Retired,.. fixed income.
Pole magnets came today, and they look good for being so cheap,.. defiantly got 'the power'. Bonding them up is way
down the road, but I'm going to have to be careful because they are real thin, and one mistake will snap them in half.
Looking at the slots, I have a lot of space between the poles, and some aluminum in between that might have to be
milled down a few millimeters to get away from induction, but at 300 rpm, I don't expect it to be a problem, so I'm
just going to leave it for now, and if heat becomes an issue, I'll go back and deal with it.
That kind of induction needs to be in super close proximity anyway, like a few thousands of an inch.
Most of these motors have 'pie' shaped stator and pole magnets, which I might have to go to, down the road, but I'm
interested in seeing how this is going to work for the moment. Probably going to need to pedal a bit to get it started,
but I can do that. First,.. get it to work,.. then, do the tweaks.
I'm finally making some headway on the 'stator tooth vs pole number' thing. To bad I switched from 24 to 21 teeth,
24 tooth axial stators are common, and usually have 8 or 16 poles, so they are sort of a no brainer.
21 is a rare combo, but it can be done, (knock on wood).
The tech and math and all the information on this stuff is immensely complicated, and would take years of schooling
to understand, my hat goes off to anyone that has any kind of grip on any of that world. Good gads!
Gives me a major headache, and glasses my eyes over, but thats what Ibuprofen is for.
Anyway, still working on it, and found this chart, and web site,.. PDF, so get some coffee while it's downloading...
(actually, it's only a few pages).
You can see that 21 poles have an option of 14, 16, 20, 22, 26, and 28 poles,.. if I'm understanding it right.
Theres more to it than that, of course, magnet width and spacing, and overlap,.. but I have hope.
In for a penny,.. in for a pound.
Site:http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.508.1648&rep=rep1&type=pdf