Search found 49 matches

by Jrbe
Oct 16 2021 7:05pm
Forum: Motor Technology
Topic: DIY Toroidal Axial Flux PM
Replies: 275
Views: 12776

Re: DIY Toroidal Axial Flux PM

That's unfortunate. How are you planning on attaching the stator to the hub? It might be worth adding some consumable / mold in place features to help hold it together and key the stator to the hub. You could also print a mold in place stator frame and hub like you'd see in a washing machine motor t...
by Jrbe
Oct 14 2021 4:54pm
Forum: Motor Technology
Topic: True FOC: definition and examples
Replies: 131
Views: 9237

Re: True FOC: definition and examples

Might be worth Google image searching those terms if you're a visual person. From pictures you find the words can start having much more meaning. I bookmarked this page to do exactly this when I have time.
by Jrbe
Oct 13 2021 7:35pm
Forum: Motor Technology
Topic: Building a diy friendly motor
Replies: 4
Views: 254

Re: Building a diy friendly motor

Thanks for the recommendation. It is definitely worth a read. I do really like the idea of it being stackable.
viewtopic.php?f=30&t=46476&hilit=Axial
by Jrbe
Oct 12 2021 6:04am
Forum: Motor Technology
Topic: Building a diy friendly motor
Replies: 4
Views: 254

Re: Building a diy friendly motor

That was an extremely useful link, thanks for sharing it! I keep coming back to 3D printing these parts and using different methods to keep it simple but functional and in reach for hobbyists. Probably means litz wire is out or maybe optional. For stator teeth I've been thinking about using insulate...
by Jrbe
Oct 11 2021 4:22pm
Forum: Motor Technology
Topic: 300A bldc esc, mosfets ringing, help
Replies: 34
Views: 628

Re: 300A bldc esc, mosfets ringing, help

My only add is that I have not had good luck with using picoscope products. I was not using the one I had on anything this sensitive and I knew it couldn't be trusted.
It might be accurate or might not be. Basically worth seeing if you can borrow a known good scope before chasing a ghost.
by Jrbe
Oct 10 2021 12:32pm
Forum: Motor Technology
Topic: Building a diy friendly motor
Replies: 4
Views: 254

Building a diy friendly motor

I've been thinking about building a motor for a while. I've learned a ton from this site and still have a lot more to learn. I have a large SLA printer hopefully arriving soon (Phrozen Mega) and have a seat of Solidworks for my day job that I will be using for CAD. It needs to be easy to assemble, b...
by Jrbe
Oct 08 2021 8:20pm
Forum: Motor Technology
Topic: DIY Toroidal Axial Flux PM
Replies: 275
Views: 12776

Re: DIY Toroidal Axial Flux PM

I have an idea for the stator. Its not fully fleshed out yet but might help this along. These are 2mm wide with a stack width in the middle of 6mm - no idea if thats ideal or not.. With this you could wind each group of coils then bolt them together. The 3 drive nubs on the inside double as holders...
by Jrbe
Oct 07 2021 12:41pm
Forum: Motor Technology
Topic: DIY Toroidal Axial Flux PM
Replies: 275
Views: 12776

Re: DIY Toroidal Axial Flux PM

Kevlar works well with epoxy, it's just hard to cut.
by Jrbe
Sep 20 2021 6:22pm
Forum: Motor Technology
Topic: DIY Toroidal Axial Flux PM
Replies: 275
Views: 12776

Re: DIY Toroidal Axial Flux PM

Is it worth breaking up the coils into groups? You could then wire in series or parallel to get inductance in a better place. correct me if I am wrong, but trying to get more inductance out of it would only reduce the Kv right? I'm not sure of the answer. I'd expect it's some tradeoff. My assumptio...
by Jrbe
Sep 20 2021 5:27am
Forum: Motor Technology
Topic: DIY Toroidal Axial Flux PM
Replies: 275
Views: 12776

Re: DIY Toroidal Axial Flux PM

Is it worth breaking up the coils into groups? You could then wire in series or parallel to get inductance in a better place.
by Jrbe
Sep 18 2021 6:09pm
Forum: Motor Technology
Topic: DIY Toroidal Axial Flux PM
Replies: 275
Views: 12776

Re: DIY Toroidal Axial Flux PM

I was thinking it could all be SLA printed. Wire could be held in place with little tabs like you see in an oring groove or a wire channel with opposing holder tabs. If built in a clever way you could remove the left side of the ring to allow winder access to the inside. I'll throw some ideas togeth...
by Jrbe
Sep 17 2021 4:29pm
Forum: Motor Technology
Topic: DIY Toroidal Axial Flux PM
Replies: 275
Views: 12776

Re: DIY Toroidal Axial Flux PM

Yellow would be a conductive bushing. Orange is wire. Outer stator.PNG.png One for each phase, rotated 120° each. So 2 outers and one center. It's the first thing I thought of after seeing this, LCM24,22.PNG.png For axial flux the T shape could change to a picture frame wedge shape and rotate maybe ...
by Jrbe
Sep 17 2021 5:59am
Forum: Motor Technology
Topic: DIY Toroidal Axial Flux PM
Replies: 275
Views: 12776

Re: DIY Toroidal Axial Flux PM

I have an idea for the stator. Its not fully fleshed out yet but might help this along. This is drawn up to mxlemming's motor schematic he has in his thread and Halbachhero's outer ring spec. Not sure any of that makes sense together but wanted to get you guys the idea. These are 2mm wide with a sta...
by Jrbe
Sep 16 2021 8:05pm
Forum: Motor Technology
Topic: DIY Toroidal Axial Flux PM
Replies: 275
Views: 12776

Re: DIY Toroidal Axial Flux PM

Do you have ideas on how to improve the next iteration? If not, what are the issues you'd like to fix? Have you found a good source for halbach arc / wedge shaped axial flux magnets? These should eliminate the length / gap / loss you mentioned. I'm not sure what is ideal, If you want the halbach mag...
by Jrbe
Sep 13 2021 7:53pm
Forum: Motor Technology
Topic: DIY Toroidal Axial Flux PM
Replies: 275
Views: 12776

Re: DIY Toroidal Axial Flux PM

Is it worth maybe ruining it by trying to straighten it? You could try to heat it a bit past it's deflection temperature then flatten it with a weight and allow it to cool.
Could be a toaster oven with foil keeping the ir from burning it.
by Jrbe
Sep 10 2021 6:22pm
Forum: Motor Technology
Topic: Building a motor
Replies: 82
Views: 2773

Re: Building a motor

I can't wrap my head around 13hp / 10kw on a bicycle. It seems like power to weight should go out the window when the weight is 90% you. My wife has a 390 KTM Duke. 300lb & 44hp for a 12:1 weight to power. To get the same on a bicycle it should have around 16hp. I've ridden 3:1 weight to power m...
by Jrbe
Sep 10 2021 4:34pm
Forum: Motor Technology
Topic: Building a motor
Replies: 82
Views: 2773

Re: Building a motor

One thing that's put a damper on this is that very recently (thinking last month but I'm not sure) this has appeared: https://www.antinnotech.com/products/ant-innovation-at-12070-lightweight-brushless-dc-outrunner-motor-15kw-with-40kg-thrust-for-electric-paramotor This isn't far off what I'm design...
by Jrbe
Sep 10 2021 4:30pm
Forum: Motor Technology
Topic: Building a motor
Replies: 82
Views: 2773

Re: Building a motor

If you went with that high of a number of pulses you would need a zero point for each, no? I was thinking you were doing what everyone else does for motors like these. I think there are some optical pickups that are stacked, 2 layers of sensors. The Nissan cas is like this, Mazda distributors in the...
by Jrbe
Sep 10 2021 3:51pm
Forum: Motor Technology
Topic: Building a motor
Replies: 82
Views: 2773

Re: Building a motor

Bassackwards derp, I keep forgetting to think inside out. You're right they don't spin and won't move air. You would only need 22 teeth, no? When you say better resolution do you mean a larger diameter? The pictured discs I posted are about 2" / 50mm and I think .048" thick, it's been a wh...
by Jrbe
Sep 10 2021 12:23pm
Forum: Motor Technology
Topic: What hall sensor is that ? Or which one do i need ?
Replies: 3
Views: 177

Re: What hall sensor is that ? Or which one do i need ?

So to start off, this is likely the replacement. I didn't find other options labeled this way. Further, the old hall sensor scraped away to internal connections. You may have blown some parts of the circuitry. Whatever caused the misalignment / play should be fixed or the same thing will happen. You...
by Jrbe
Sep 10 2021 11:22am
Forum: Motor Technology
Topic: DIY Toroidal Axial Flux PM
Replies: 275
Views: 12776

Re: DIY Toroidal Axial Flux PM

You want it to bond though. That way it can put the wire in tension or compression. That's how it helps rigidity / strength.
by Jrbe
Sep 10 2021 11:04am
Forum: Motor Technology
Topic: Building a motor
Replies: 82
Views: 2773

Re: Building a motor

The horrible image I attached is what I meant for making airflow with the laminations. If the red oval slots are cleverly placed /aligned with the winding T shapes you could rotate each lamination 1 position to make a screw / fan shape. It's exaggerated a bunch but helps visually what I meant. As fo...
by Jrbe
Sep 10 2021 10:53am
Forum: Motor Technology
Topic: Building a motor
Replies: 82
Views: 2773

Re: Building a motor

You could likely clearance the hub for the sensors to flush them and maybe even seal off the optical area with a 3D printed cap. Or a 1 or 2 piece cap that doubles as an impeller. You could do the chopper disc inside out and have the sensors inside, not sure if there are any benefits but I think it'...
by Jrbe
Sep 10 2021 8:03am
Forum: Motor Technology
Topic: DIY Toroidal Axial Flux PM
Replies: 275
Views: 12776

Re: DIY Toroidal Axial Flux PM

One thing to try is to see if the resin you use is holding on your wire. It might not be bonding to the wire well. If it's not bonding the wires could just be slipping in the resin like if they're in little tubes. One thing that might help this is adding fiberglass tow in with your winding wires bef...
by Jrbe
Sep 10 2021 6:30am
Forum: Motor Technology
Topic: Building a motor
Replies: 82
Views: 2773

Re: Building a motor

I get using the magnets that are there already for triggering but if the halls go all wonky pushing current, it seems optical could be the way to go. Is it worth adding provisions for them? If you're pressing in an aluminum core would the press fit warp the laminations on you? You could go slip fit,...