mxus xf15 gear hub motor teardown

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valsam   10 mW

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Re: mxus xf15 gear hub motor teardown

Post by valsam » Feb 25 2020 1:51am

Sorry my friend ,i was talking about the kit (witch has the same controller)reviews that are 14 and has
27 orders!
https://www.aliexpress.com/item/4000258 ... 76ddcs8rp1

john61ct   100 GW

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Re: mxus xf15 gear hub motor teardown

Post by john61ct » Feb 25 2020 7:33am

That language glitch - wipe your cookies

mechhead   10 W

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Re: mxus xf15 gear hub motor teardown

Post by mechhead » Mar 30 2020 5:54am

Well thanks Amberwolf for your wonderful educational pieces now Back to the Topic.

this one shows numbers on the pair i got


photos
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mechhead   10 W

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Location: adelaide south australia

Re: mxus xf15 gear hub motor teardown

Post by mechhead » Mar 30 2020 5:56am

Innards are coming out
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mechhead   10 W

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Location: adelaide south australia

Re: mxus xf15 gear hub motor teardown

Post by mechhead » Mar 30 2020 6:03am

This was all done ages ago but i work full time as a groumdwater tracer scientist and have a 6yo daughter .., slogress is progress any way i digress... Now you can all watch it all speeded up into a few of the best pics ..
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now to get rid of that useless hall board, you can also see that i have removed the hall wiring and replaced the old wiring through the axel with the original phase wire but without the sheath i can fit 6 strands ,a pair of temperature sensor wires and a very thin PTFE hose the reason for the hose will become aparent shortly

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mechhead   10 W

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Location: adelaide south australia

Re: mxus xf15 gear hub motor teardown

Post by mechhead » Mar 30 2020 6:13am

This shows all the terminations, what you dont see is that under the heatshrink the wires ends are all soldered and then coated in oil resistant silicone this is then squeezed by the heat shrink hopefully sealing the wire core and insulation against fluid creep. it has been a couple of months being ridden without the battery (under construction) and no drips so far. Temp sensor tucked up against the windings (bottom black thing) and a anti splash breather pipe cap to stop the squirts .
and all squared away with a minimum 2mm clearance to housing and tied down with dacron/cotton woven boot cord.
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mechhead   10 W

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Location: adelaide south australia

Re: mxus xf15 gear hub motor teardown

Post by mechhead » Mar 30 2020 6:27am

add important detail;drain plug
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Solvent clean and scrub, assemble gears and clutch
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insert beastly outrunner (0.35mm lams 24mm thick 108mm stator wound with 6 turns of 10x 0.5mm wire in wye )

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mechhead   10 W

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Location: adelaide south australia

Re: mxus xf15 gear hub motor teardown

Post by mechhead » Mar 30 2020 6:46am

This one shows the nice wheel i built it into in the back ground
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And the mostly installed item in the bike with one motorcycle tyre 16x2.5" vee rubber up front and a bmx on on the back while i wait for another like the front had to cut of the V brake bosses to fit the moto tyre on the back but its been on and ridden like it looks in the pic for weeks now and it is as nice as pie to ride i dont notive any extra drag formthe motorcycle tyres and the whole frontwheel is only 50g heavier than the original 26er brakes are awesome and the suspension is very plush the slightly altered geometery only a loss of 5mm bb ground clearance with the longer than original forks (130mm manitous vs 70mm mozo ) and the longer rear shock a 190 long 55mm travel dnm replaces the original 160mm long 35mm travel pogo coil of the nodamping flavor (infinite improvement) I love riding of things on it and doing wheelies ( still no battery )
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mechhead   10 W

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Location: adelaide south australia

Re: mxus xf15 gear hub motor teardown

Post by mechhead » Mar 30 2020 6:50am

Building a battery now with A123 AMP20 20 ah pouch cells will be 14s 1p to go with a flipsky 12fet vesc6.6 and hopefully saturation will be a little more than the 60 battery amps that the vesc is capable of. More pics to follow , slowgress is progress

Enewb   10 µW

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Re: mxus xf15 gear hub motor teardown

Post by Enewb » Apr 02 2020 9:30am

Thanks for getting us back on topic!, great work. I'm still waiting on battery for mine.

fourbanger   100 W

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Location: Victoria B.C. Canada

Re: mxus xf15 gear hub motor teardown

Post by fourbanger » May 08 2020 10:18am

Been looking at this motor a bit myself lately. Thanks for doing the legwork on figuring out the RPMs and for the great pictures.

A couple of questions, both of which might be somewhat foolish. How did we get from a 120mm x 18mm stator on page 1 to a 108x24mm on page 2? And, specifically (apart from the obvious price point difference, what makes the xf15 so superior to, say, the swx02?

Thanks!

PS

How did you ever fare with that greenpedel crossbreak conversion?

mechhead   10 W

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Location: adelaide south australia

Re: mxus xf15 gear hub motor teardown

Post by mechhead » May 09 2020 7:17am

Hi Fourbanger, the measurement changed when i went form eyeballing it and guesstimating and getting out the calipers, for the greenpedel motor it is sitting in a box abandoned because the motor was not a bafang. it had a plastic ring gear and the motor rotor was horribly unbalanced and i was at the time happy with the smaller oil cooled old bafang hub i modded the same way as the one above. Those older bafang minis with steel gears added, oil cooling and beefed phasewires it was a 14t terminated in delta. The one above is its replacement on the same bike but with smaller wheels as in the pictures. The older bafang minis were very wide more than 150mm across the locknuts and this made the gear shifting terrible under pedaling and only 7 of the 8 speeds could be used without the chain coming off.

pedaling the bike with the new cassett motor is a dream with perfect shifting and a 9 speed cassett. The battery design is nearly complete as are many of the pack components, I'm itching to ride it with the motor working, its twice the motor of the little old bafang minis and thinner lams to, the old minibafang was fed a diet of 75 phase amps 45 battery amps but needed delta termination to get over the 35 amp phase mark without saturating, the xf15 has much larger gears and clutch than the old mini as well

40 a123 20 ah pouch cellls are all tested for capacity and all have IR between 3.5 and 2.1 milliohms probably varying with temperature mare than anything. 14 with lowest IR will be used in the pack.

battery pack components made so far:
celltab clamp busbar and insulator stacks are ready,
the heat sink fins for the battery terminals are ready,
the battery case bottom half made from 3mm alloy removed from a dead plasma mass spectrometer (is not 5000 series peanutbutter alloy )
bms has been tested on 14 shitty laptop cells and works fine and balances the trash cells quick its a chargery bms16
controller heatsink and fan arrangement are ready for insertioon in to hte battery box where they will warm the battery with waste heat during cold weather 5 degree temps in winter sometimes means it takes less energy to heat the battery to 25 degrees than you loose in the high ir of cold cells and you get stiffer voltage.
second fan and the controller for both fans are tested, the second fan will cool the pack and controller with lots of airflow when needed on a thermostat speed control summers here are very hot so it will need it.
controller is a vesc 6.6 from flipsky.

more to come

mechhead   10 W

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Location: adelaide south australia

Re: mxus xf15 gear hub motor teardown

Post by mechhead » May 09 2020 7:26am

hi again fourbanger i forgot your second question, " why is it better than the SWX02 series ?"

because it has thinner laminates and comes in a faster wind i could not find an swx with a goodly fast wind and the xf15 sold as a 36v motor has less turns and more wire than any of the swx02's i have ever seen, I have repaired a few when i was working at Micycles in adelaide and the best wind i ever saw was a 10t with six strands of 0.5mm wire, the XF15 on the other hand has 6t of 10 wires, to get the same performance from an swx02 you would have to terminate a slow one in delta, the fast one would be too fast to be a good climber and delta is less efficient than the same kv wind in y

fourbanger   100 W

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Location: Victoria B.C. Canada

Re: mxus xf15 gear hub motor teardown

Post by fourbanger » May 11 2020 12:31pm

Plastic ring gear, huh. Well that's pretty shabby even by MY low standards. FWIW, Grin Tech used to sell a code (9) swx02 that did 9.7rpm/v. I've yet to see another.

I'll have to pick your brain some more regarding the delta/wye efficiency sometime. Sounds like there might be more to it than I though.

Good luck with the build, looks like it's going to be a real ripper!

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