Search found 310 matches

by Kodin
May 18 2016 12:28pm
Forum: Items for Sale - New
Topic: upgrade Axle set for MXUS 3000 V2
Replies: 87
Views: 12931

Re: upgrade Axle set for MXUS 3000 V2

It's high-temp motor laquer for the red stuff. Flat black paint for the side-covers. (Krylon matte finish has a pretty damn nice thermal coefficient compared to high-end purpose made paints). Also, Madin, here's my first (failed) prototype in 4340... https://photos.smugmug.com/photos/i-3JX5c7n/0/L/i...
by Kodin
May 13 2016 12:47am
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223599

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

No worries, just was checking. :) I'll let you guys know if I ever get my motor rebuilt what I'm able to reach on my 5T. :P ...Current status of my replacement shaft design... https://photos.smugmug.com/photos/i-3JX5c7n/0/L/i-3JX5c7n-L.jpg I got a few dimensions incorrect due to material deflection,...
by Kodin
May 12 2016 11:41pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223599

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

How many amps are you pushing yours Cowardlyduck?
by Kodin
May 02 2016 7:00pm
Forum: Items for Sale - New
Topic: upgrade Axle set for MXUS 3000 V2
Replies: 87
Views: 12931

Re: upgrade Axle set for MXUS 3000 V2

Thermal epoxy would be far more sturdy actually; I've seen it done once or twice for high powered motor builds to cool the stator with water circulation. It helps, but not as much as you might think. Further, the windings themselves might be better if they were fully potted as there's a lot of air g...
by Kodin
Apr 25 2016 8:46pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223599

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

- CA 2.3 DP No. Get a CA 3 with temp rollback and other goodies. A very different product than the 2.3 for an extra $30. Get a temp sensor in the motor. Even if there are difficulties with the installed sensor (?), it's easy to change it compared to pulling new wiring to get a sensor wire installed...
by Kodin
Apr 25 2016 2:18am
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223599

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

Looks like you've got it all right so far. 5T seems to have the most copper fill so that's good, temp sensor doesn't cost anything to add in but they don't have a history of working with CA's so you'd have to swap it out anyway. Everything else looks good to me. Sounds like a solid plan for a build....
by Kodin
Apr 24 2016 12:30pm
Forum: E-Bike General Discussion
Topic: Alternative motor shaft design and dropouts concept
Replies: 18
Views: 1711

Re: Alternative motor shaft design and dropouts concept

Well, to start I'm actually going to leave out the keyways and keys as an experiment. 14mm right side, 25mm left side, simply tightened down like a collet on both sides to the spec of the fasteners. I'll mark the shaft position rotationally and see if it wants to move by trying to abuse it some. If ...
by Kodin
Apr 22 2016 12:13pm
Forum: E-Bike General Discussion
Topic: Alternative motor shaft design and dropouts concept
Replies: 18
Views: 1711

Re: Alternative motor shaft design and dropouts concept

Ah, interesting. The original Grin design was using hexes, looks like they've moved to a spline for better holding capability.
by Kodin
Apr 22 2016 3:49am
Forum: E-Bike General Discussion
Topic: Alternative motor shaft design and dropouts concept
Replies: 18
Views: 1711

Re: Alternative motor shaft design and dropouts concept

I was just informed of Taperlock bushings. Basically a bushing with a taper on the outside, a slot cut into it to be able to compress onto a shaft, and a keyway. Weld or bolt a hub into a frame, screw down the bushings onto the shaft, done. Further, to pull the whole wheel, remove the grub screws, i...
by Kodin
Apr 22 2016 2:50am
Forum: E-Bike General Discussion
Topic: Alternative motor shaft design and dropouts concept
Replies: 18
Views: 1711

Re: Alternative motor shaft design and dropouts concept

Because those don't have to lock the shaft from spinning against the frame; only lock the shaft to the frame. Hubmotors transmit all their torque through their axles. A motorcycle style mounting arrangement will still allow the shaft to spin. That's why you need torque arms on pretty much 90% of hig...
by Kodin
Apr 21 2016 8:41pm
Forum: E-Bike General Discussion
Topic: Alternative motor shaft design and dropouts concept
Replies: 18
Views: 1711

Re: Alternative motor shaft design and dropouts concept

Quite a novel idea if you don't use a chain at all like a motorcycle, but for the cog side you're limited to a certain shaft size for freewheel and cassette hubs. I've been trying and trying and trying to get a cassette to fit with a decent shaft size on my motor and finally realized I can simply ta...
by Kodin
Apr 21 2016 7:19pm
Forum: E-Bike General Discussion
Topic: Alternative motor shaft design and dropouts concept
Replies: 18
Views: 1711

Re: Alternative motor shaft design and dropouts concept

Mostly in cross-section thickness. Most of the motor shafts out there are designed to fit into standard bike dropouts. I think that's a serious limitation that can easily be mitigated by using something like a combo torque-arm/dropout that mounts up to the existing dropouts, clamps to the frame like...
by Kodin
Apr 21 2016 12:00pm
Forum: E-Bike General Discussion
Topic: Alternative motor shaft design and dropouts concept
Replies: 18
Views: 1711

Alternative motor shaft design and dropouts concept

I've been thinking about it for a while, and I'm wondering why no one has considered designing a motor with custom dropouts and a shaft that can transmit torque more effectively to the frame. Looking at options, there's keyways, some sort of hex shape, or some sort of spline. I'm divided right now o...
by Kodin
Apr 20 2016 3:28am
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223599

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

Also motor shaft is tiny with cassette version. I really don't like the design but cassettes can only accommodate a certain size regardless of what you may want. Biggest I've been able to bore into my cassette unit was 14mm, and I think the "stock" shaft is like 10mm. Eesh. Tempted to just go round ...
by Kodin
Mar 15 2016 11:20pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223599

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

.. At the power levels the Leafbike motor can run, it's pretty damn efficient compared to most of what's out there. Proven truth. Not just on paper. I have done none of the cooling mods mentioned. I typically run at an average of 1500w with frequent peaks exceeding 2000w, in a 26" wheel with the 5T...
by Kodin
Mar 14 2016 4:18am
Forum: Items for Sale - New
Topic: QS MOTOR,0.5-14kW Electric Hub Motor Manufacture China
Replies: 1340
Views: 268914

Re: Cheap BLDC controller, 200A, suitable for 96v 8000w moto

Did a teardown of my SSC048150 and its using 24 4110 FETS meaning up to 96V 150 A. Check aliexpress. I see the qsmotor store still has some models available. I paid about $300 give or take, shipped to Oregon. Shipping will be the same for WI.
by Kodin
Mar 14 2016 3:52am
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223599

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

Not exactly what I meant; you seal the side covers with thermal paste rather than silicone sealant; accomplishes the same goal of sealing the covers, and gives you a better interface than (generally thermally insulative) silicone sealer. Also, the ferrofluid tests have been shown to be as effective ...
by Kodin
Mar 12 2016 11:56am
Forum: E-Bike Technical
Topic: 19" Motorcycle Wheels vs 26" Bicycle Wheels (rim and tires)
Replies: 2207
Views: 321423

Re: 19" Motorcycle Wheels vs 26" Bicycle Wheels (rim and tir

I do 90% pavement, maybe 10% gravel, no dirt. Been looking at Michelin Anakee III as it's got a very similar profile to a hookworm. Anyone tried them before?

This will be for my hubmotor in a 21" rim. Front is a Pirrelli MT66 80/90-21 on a 21" rim already.
by Kodin
Mar 12 2016 11:48am
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223599

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

Thermal grease works too. Also you could simply put 5 ml with one cover off and close up the whole thing; wouldn't be exact but it sure would be close...
by Kodin
Mar 11 2016 4:39pm
Forum: E-Bike Technical
Topic: 19" Motorcycle Wheels vs 26" Bicycle Wheels (rim and tires)
Replies: 2207
Views: 321423

Re: 19" Motorcycle Wheels vs 26" Bicycle Wheels (rim and tir

Hey, at least you aren't running a 29 on the front!
by Kodin
Mar 11 2016 2:57pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223599

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

The speed band is affected by a lot of things, but the main one would be ambient temperatures and heat build up in the motor. If you don't already have venting or ferrofluid, get some ferrofluid and drop in the required amount. (somewhere around 5 ml, add 4.5 and start adding tiny amounts and testin...
by Kodin
Mar 11 2016 3:25am
Forum: E-Bike Technical
Topic: 19" Motorcycle Wheels vs 26" Bicycle Wheels (rim and tires)
Replies: 2207
Views: 321423

Re: 19" Motorcycle Wheels vs 26" Bicycle Wheels (rim and tir

Alex Rims Supra 35? Decent width, no machined sidewall, and mostly black other than decals.

http://www.alexrims.com/product_detail. ... 22&pid=140
by Kodin
Mar 10 2016 12:05am
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223599

Re: Leaf / leafmotor / leafbike high efficiency 1500w motor

Keep in mind shunts may have up to 5% deviation and therefore what you "measure" with one CA may not be the same as another. Also depends on ambient temps as well. Only way to know for sure is to use a higher end meter, (4-wire measurement preferred) to measure actual resistance values as accurately...
by Kodin
Mar 07 2016 3:28pm
Forum: E-Bike Technical
Topic: Keyed through-axle hubmotor conversion...
Replies: 9
Views: 1044

Re: Keyed through-axle hubmotor conversion...

Yeah, I saw that as well; I really do like the hexagonal torque arm engagement, as it's simple to fabricate on the end of the builder. Only question I have is say you mount this to a front fork, how do you install or remove the motor? Not all forks have the play to stretch the dropouts over the hexe...
by Kodin
Mar 07 2016 3:04pm
Forum: E-Bike Technical
Topic: Keyed through-axle hubmotor conversion...
Replies: 9
Views: 1044

Re: Keyed through-axle hubmotor conversion...

Well there's two ways it could be done - One: single large-diameter hollow shaft, which the keyed shaft slides into. Two, and the way I'd prefer: swap bearings in side covers out with ones that have larger inner diameters. Then add tubes that go through the bearings and butt up to the stator shaft b...