Search found 300 matches

by APL
Jul 18 2019 7:35pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

Caught a summer cold this week, so I was out for a while, but was back in the shop today and machined out the bearing cap clearance for the new bearing. Spin's real nice now. When I put it all back together, I left out all the cores so I could get a feel for how much resistance the rotors would have...
by APL
Jul 12 2019 1:49pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

Maybe I can sell it as a brake for a Bullet Train. :) Interesting stuff, reminds me of Faradays homopolar generator, and furnace, and gets back to the basics of everything electric. I've always wondered if a stacked version of the so called N-machine, with modern magnets, would make a good wind mill...
by APL
Jul 10 2019 7:22pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

No need to do a sanity check, I'm pretty sure I'm nuts. It's OK though, because most everybody els is too. :) Not a drill press, I wanted to use a hand drill so I could get a feel for it. Not a wimpy drill, but not a brute either. I should have specified that the 'spinning part' was a stator plate, ...
by APL
Jul 09 2019 7:32pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

You were right,.. there is a lot of drag on the aluminum when I spin the rotor with the drill. 26 magnets makes a big difference, and even at 10mm away it will start to drag the drill down. At 5mm it will have enough power to spin the test piece of aluminum below it, and at 1mm the drill will have a...
by APL
Jun 24 2019 8:04pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

I had the idea of twisting the 10 strand coil wires, to try to keep them from spreading out after winding, which seemed to work somewhat. But still tends to spread out at the corners of the winds, and insists on being a double layer wind. Twisted.jpg So then I stripped off some 14 awg, and tried an ...
by APL
Jun 22 2019 11:59am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

I've seen other shows on the matter, but the model really helps explain what happened. 30 years
later and it's still just as sad and tragic. A monument to what humans can achieve,.. in many ways,
both good and bad.
by APL
Jun 21 2019 7:51pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

I absolutely cannot figure out what that is,.. but it looks a lot like some of the dreams I've had lately. :confused:
by APL
Jun 20 2019 7:14pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

Well, it makes for a good photo at least. Maybe I can sell it as art. :) Stator Flower..jpg After fixing the three coil shorts, I finally got it all wired up for the test, and put the stator back together, Went to check the ground wire for shorts,.. and still have one! :evil: Grrrrr! I seems that wh...
by APL
Jun 16 2019 12:32pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

I can try to do that,.. I think I can reverse one rotor plate, but will have to assemble the motor, to spin it. The rotors are not supported by themselves. It will take a bit of effort, but I'll give it a shot. I might as well get readings for a single, and both rotors. Good information to have for ...
by APL
Jun 15 2019 7:32pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

It finally dawned on me that I can just use a large puller to take the rotors off. Doesn't leave a mark and comes off with out a wrench, just using my hand to turn it was enough. Very nice! Rotor Puller..jpg After I got it apart, I desoldered all the connections, and measured each coil. Three were s...
by APL
Jun 14 2019 1:50pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

The straight cut would probably work fine, although a slant cut would provide a little more support? Maybe a thin piece of glassboard, or plastic, and epoxy in the slot. Many simple ways to do it at any rate. Slany Cut 2.jpg Works out in a picture,.. but in reality things are a bit smaller, so I'll ...
by APL
Jun 13 2019 1:11pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

Almost missed your post Dui,ni shuo de dui,.. thanks for the experimental suggestion. :thumb: As far as cutting the plates, there has been some previous discussion about it back around page 11 or so. It keeps coming up, but the current plan is to cut an 'L' in the side of the slot, and place a non f...
by APL
Jun 13 2019 2:24am
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

Yes, with the phase's all being connected on one end,(Y), and such low resistance, They would all appear to be shorted, when in fact, it only takes one shorted wire to get that reading. I'll have to break it down like you said. But if theres one, there are probably others. I suspect pinched magnet w...
by APL
Jun 12 2019 9:06pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

OK, so I finally have some data on the AC output. I hooked up the little scooter motor to do the spinning, and it complained quite a bit, but growled away enough to get some readings. AC test.jpg It was easier to run it up to a certain volt out, rather than start from an RPM. This meter has an annoy...
by APL
Jun 12 2019 1:57pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

Thanks Dui, ni shuo de dui. Spacers are 1/2" flat stock, and I used a large end mill and just plunge cut the pieces in the vice. Mostly eyeballed it, and massaged it as I went. A couple of chamfers on the tops, and a bit of belt sanding. The only really precise cuts were the length of the spacers, w...
by APL
Jun 10 2019 3:41pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

No, they're not wired in parallel. Perhaps I misunderstood you when you said to measure 'each' coils output. To do that I would have to disconnect all the coils, and re-wire, running 22 wires out,.. for 21 coils. My bad. Perhaps you meant to measure each phase of coils together, as fechter just stat...
by APL
Jun 09 2019 1:49pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

Thanks for the info. on ohm measurement's, I remember Doctorbass stating hi-end meters when he did his 5300 series tests. I imagine they use specific leads with plated ends as well. https://endless-sphere.com/forums/viewtopic.php?f=16&t=19301 A theoretical ohm's is possible by taking the length of w...
by APL
Jun 07 2019 8:58pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

That sounds reasonable. It does act as though it's shorted, and would explain why I can't get a decent ohm reading, and why it doesn't turn any different wether I short the phase wires together or not. One can only hope. That would make it simple. I'm probably not that lucky though. I'll tear it dow...
by APL
Jun 06 2019 2:20pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

Not sure on the BEMF question, if you mean oscilloscope, I have an automotive one I haven't looked at in years, perhaps I can use that. Sorry, I mean the gaps between the cores, the inside diameter specifically. Limited knowledge on this, and maybe on the wrong trail, but I assume the cores and PM's...
by APL
Jun 06 2019 1:08pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

The laser tach that I ordered still isn't here, but should be today, so no Kv yet. I finally got the test stand built, mounted the motor, and decided just to go for it, and hook it up to the power. The first test was a bit disappointing, that is, it didn't just take off spinning, as I had hoped. :( ...
by APL
Jun 02 2019 12:28pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

I remember my grandpa using that set up on the farm,..actually not to far off though, I think I'll use the little scooter's motor, and a long chain to drive the cog on the 'Midas motor'. I ordered a tachometer, and as soon as it gets here, I'll try to get a Kv. I tried to measure phase ohms, but my ...
by APL
May 30 2019 1:25pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

Awesome ideas! I do have a Cycle Analyst, so thats one good way that I can use. Ive been aware of the laser RPM units, but was under the impression that they were expensive,.. should have looked it up, but now I see that they are actually cheap. I don't know how well they work, but I think I'm going...
by APL
May 29 2019 1:54pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

Thanks for the thumbs up guys, just as soon as I can resolve some issues, and get the test stand built, I'll give it the juice. :bolt: I'll start out by using my E-cruiser phase wire hook up, since I know that system works, and will eliminate any problems from that end. The test stand will just be s...
by APL
May 28 2019 8:44pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

Update! :) Finally got this this beast together, and the good news is, it turns,.. by hand. :thumb: Motor Together 1.jpg Motor Together 2.jpg A big load off my chest, although there are some problems to solve yet. The air gaps are a little uneven, but I can shim the bearing caps/bearings, to center ...
by APL
May 21 2019 9:48pm
Forum: Motor Technology
Topic: APL's DIY axial-flux motor
Replies: 352
Views: 17389

Re: APL's DIY axial-flux motor

Stator is finally all soldered up. I cut down some crimp connectors, to solder all the coil wires together with, so they're put together well. I could have shortened up all the wires, but stripping enamel is a pain, and you never know what changes you might have to make. Best to have a little extra....