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by APL
Oct 25 2020 2:34pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

Inrunners can be made to mount from anywhere on the case, but I think one good way might be to go directly to the bearing area, fairly common on many RC motors. This takes all the stress off the rest of the case and connects the mount to the source Motor mount..png This idea uses a steel ring on eac...
by APL
Oct 24 2020 2:11pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

Yea, I have been working on a coreless version in my head, just thoughts at the moment,.. but one of these days. Definitely multi disc, multi stator, and it would probably a bit wider, but like you say, most of it can be 3D printed, which is very attractive. I agree, it wouldn't be too much differen...
by APL
Oct 24 2020 1:30pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

I've been busy sketching Thecoco974's inrunner idea for a version 3 motor, and I'm liking it even more than the outrunner version. :thumb: This is a mid-drive motor for a mid-drive bike. Inrunner version V3.png The two aluminum stator carrier's are solid one piece and easy to turn on a lathe, as wel...
by APL
Oct 24 2020 12:59pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

Tanks Stan.distortion, that's what I need to know. After reading you're previous post's a few times I understand what you are saying a little more clearer. I'll probably have to get into G code basics a bit at some point, but I'm hoping to find a board or a program that does it for me from CAD STL o...
by APL
Oct 23 2020 1:02pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

Thanks guys! Thats just what I need,.. this is what I love about the forum! The MPCNC is just the kind of thing I need, I'll look into it, thanks for the links. :thumb: Thanks for your input Stan.distotion, mostly way over my head but informative, sounds like this is all right up youre ally, and goo...
by APL
Oct 22 2020 1:09pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

Well, that is a question I've been wondering about, can you epoxy Titanium? I think we used to use it in brazing fixtures because nothing would stick to it. If true, then cutting and bonding things to the outside rim would be futile. In which case, then the inner cuts would be an even more viable op...
by APL
Oct 21 2020 1:14pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

I hadn't thought of that way Dui, ni shuo de dui, it is interesting though! It wouldn't be very strong by itself, but you're right,.. once the center was clamped down, it might be stronger than the outer-slit method. I'll give it some thought. The only thing I can think of at the moment is that it m...
by APL
Oct 21 2020 12:41pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

Thanks Stiffler359, no, I'm not using any design software, I'm using the awesome help and experience of others here on the ES. :thumb: (and a LOT of internet searches.) The point I would like to make is that this could be an interesting hobby for anyone, and that you don't necessarily need to know a...
by APL
Oct 19 2020 8:35pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

I colorized the core sections in this drawing, to show how they're wired together. It's like a three-cylinder of 3's. :wink:
The 'tri-core' sections work well with that, and could possibly be removed as units,.. each with only two wires.
V3 Phase pattern..png
V3 Phase pattern..png (207.15 KiB) Viewed 459 times
by APL
Oct 19 2020 8:04pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

I think your right about that Thecoco974, Theres no reason to have a thin or machined rotor between the magnets, unless you want to run the flux path through it. I guess it would be lighter, but a thick iron rotor will work too, the flux path would 'U' over to the next core and have a shorter flux p...
by APL
Oct 18 2020 2:05pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

I'm also not sure how it would be wired up yet, as it's basically two separate motors in one, back to back. The coils could be wound together on each side, or the two sides could be wound separate, but phases connected parallel. Or, the cores and rotors on each side could be shifted one half coil sp...
by APL
Oct 18 2020 1:50pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

Not sure if theres some confusion here. The sketch above is for a dual rotor, and is the same as the motor I'm building now. I didn't draw in the cores on the other side. My bad. Anyway, I finally figured out that if I get a 10" square piece of 2" thick aluminum plate, I can make both the stator and...
by APL
Oct 17 2020 7:05pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

After seeing the cores in your drawing, the SMC back iron idea for this design seemed like it might actually work better. So I tried it in a drawing, and I'm impressed, things fall together and nothing fights anymore! It can use a 1/2" thick center plate or more, and one SMC section could cover thre...
by APL
Oct 16 2020 9:57pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

Thanks Thecoco974, that's a good idea! I was just thinking that we might be needing a new approach, because this design is getting forced a lot, which is not a good sign. Good designs should fall together. I probably didn't lean towards the inrunner, because it's harder to mount in the bike, but I d...
by APL
Oct 16 2020 1:09pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

The top of the cores and magnets are far enough away from the plate, so the brunt of the eddy effect is the AC flux going through the metal plate at the core center. The effect is reduced with distance, I wonder if it's possible to bring it into acceptable amounts with a few millimeters of a plastic...
by APL
Oct 15 2020 4:23pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

In the meantime, I've been working on the new bike frame details,.. and some Ideas for a possible Version 3 motor stator assembly, nothing really new yet, just a collection of old and newer ideas. In this stator concept, a 10mm (thicker) aluminum plate is used, and the spacers and standoff's are glu...
by APL
Oct 10 2020 1:21pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

It is slightly conductive, which is why I had the question, I had measured it a long time ago. But I just got done measuring it again, and it jumps around incessantly but I get readings anywhere between 20K and 200K ohms. More or less. So your probably right, and since the voltage in the loop is is ...
by APL
Oct 09 2020 1:39pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

I'm drawing up the new Ti. stator plate in CAD so it can be CNC'd, and got to thinking about the metal cores contacting the titanium surface. It occurred to me that it's probably going to short out the slits being put in the plate. I should probably put some Kapton tape around the core bottoms to in...
by APL
Oct 08 2020 2:19pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

Thanks major, your right of course. :thumb:

Dang it, I didn't notice that there was a new page, and edited my last post. Now people don't know what were talking
about. Sometimes I come back and edit, because I tend to blab on and on about nothing,.. got caught this time. :confused:
by APL
Oct 07 2020 1:58pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

Sorry, my bad, I should have included the link. Yea, it's for flux adjustment, as stated on page 17, fig 7. https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7933123 All "over my head" stuff, and too much info for a DIY guy like me at the moment. Interesting though, and I've also seen the coil in...
by APL
Oct 06 2020 10:07pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

Ha! I was trying to say something like that a while ago, many pages back... a center iron dual stator, dual rotor axial. Can't find it now, this thread is so long. :wink: Center iron axial 3.jpg I think I was wondering why you wouldn't have a shorted turn on something like that. Obviously the steel ...
by APL
Oct 06 2020 2:31pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

Thanks Thecoco974, I know I show a lot of CAD drawings,.. I try to stay active with that, because it's a fantastic tool, and I learn more and more as I go. I realized that the cores actually do hold the slots together, your right, but theres only a 4mm screw going through them, and it's only tight e...
by APL
Oct 03 2020 10:14pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

I like the way it looks in the drawing, but I'm not sure about the real world version. The ring would have to be insulated, of course, and un-closed. Just another posible idea. Grooved edge..png I've been told that Titanium isn't the greatest thing to machine, it work hardens and needs good cutters,...
by APL
Oct 03 2020 1:32pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

Thanks for the McMaster link coleasterling, the ceramic selection is awesome. I've been paging through the catalog for hours! Looks like pins are no problem, but would have to be turned to size. I'm not sure what "machinable" means to them, but I would hope that it could be done an a simple manual l...
by APL
Oct 02 2020 9:28pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 1285
Views: 115911

Re: APL's DIY axial-flux motor

Yes, the slots unfortunately are back again. Hate the slots but have no choice at the moment. Well, time to give it more thought I guess. Ceramic is tough to work with, your right. And not much availability either. Glass rod? Should be glued in for sure. I could maybe anodize some aluminum pins,and ...