Search found 310 matches

by Kodin
Mar 06 2016 6:09pm
Forum: E-Bike Technical
Topic: Keyed through-axle hubmotor conversion...
Replies: 9
Views: 1042

Re: Keyed through-axle hubmotor conversion...

I'm thinking far simpler than that; make the motor built on a tube with internal keyway(s), where the key(s) are mounted to the motor itself. Then have a shaft with a keyway cut all the way along it's length act as the "through" axle. Keeps any keys from restricting the axle's movement while still a...
by Kodin
Mar 06 2016 3:46pm
Forum: E-Bike Technical
Topic: Keyed through-axle hubmotor conversion...
Replies: 9
Views: 1042

Keyed through-axle hubmotor conversion...

Been thinking about 15 and 20mm through-axle hubs lately and it got me wondering - What stops someone from making a solid 15mm shaft, popping a hubmotor shaft off a hub, installing a key into the keyway of the stator permanently, and cutting a keyway slot in the shaft so it can slide in and out of t...
by Kodin
Feb 23 2016 8:43am
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223287

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

I wouldn't suggest the 1500W with cassette; ordered parts for one and the shaft is 10mm on the cassette side. No bueno; shaft is thin. I've modified mine to 14mm by boring the cassette unit and I'm cutting a new custom shaft from scratch; this is 10x more work than the "average joe" could ever do, s...
by Kodin
Feb 11 2016 1:14pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 2101
Views: 396200

Re: Definitive Tests on the Heating and Cooling of Hub Motor

Dude... Guys. Justin stated MEASURE YOUR CURRENT DRAW WHILE ADDING INCREMENTALLY. When you start to get an increase in current draw while running max unloaded, you've added enough FF to your motor. You want barely any contact. Adding too much doesn't improve cooling ability, and instead just adds fr...
by Kodin
Feb 10 2016 7:18pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223287

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

What micro do they run and where do you get firmware?
by Kodin
Feb 10 2016 11:00am
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223287

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

For torque and current draw reasons I went with a 5T with 12s. I'll likely bump to 72V later on for more speed but only after I'm confident with the rest of the bike.
by Kodin
Feb 09 2016 9:58pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223287

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

I'd actually be tempted to take a look at Justin's PhaseRunner on a 3T or 4T with a small diameter wheel... sine-wave/FOC in a super tiny package, though it tops out at 40A continuous since it's a 6-fet... If you go with 72 or 96V and an appropriate wind for say, a 14 or 15" motorcycle rim, you migh...
by Kodin
Feb 06 2016 11:50am
Forum: Items for Sale - New
Topic: QS MOTOR,0.5-14kW Electric Hub Motor Manufacture China
Replies: 1340
Views: 268462

Re: QS MOTOR 500W-16kW(Rated) BLDC In Wheel Hub Motor Index

^ Yeah, Justin's been experimenting with FerroFluid as a cooling mechanism for hubmotors. Check out his definitive cooling of hub motors thread for more info. Only takes a couple ml of fluid to double the heat-shedding capacity of a motor. (More is not better, there's a reason it's ~5 ml for typical...
by Kodin
Feb 06 2016 11:42am
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223287

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

IIRC, Nep was running 60-80A on his 4T... Get a 5T, it has more copper fill anyway, which is the only way you'll get more torque. Adjust your max speed with voltage. Your batteries and controller will be more happy. These motors probably only top out at 45 MPH max anyway. If you're looking for more,...
by Kodin
Feb 05 2016 1:32pm
Forum: E-Bike Technical
Topic: Quick Release Kill Switch
Replies: 25
Views: 1747

Re: Quick Release Kill Switch

I have a big tube of dielectric grease, so that's probably what I'd use.
by Kodin
Feb 04 2016 11:03pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223287

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

5t should be better for lower amp controllers. IIRC the 4t doesn't open up until 60A on a 26 inch wheel.
by Kodin
Feb 04 2016 7:57pm
Forum: E-Bike Technical
Topic: Quick Release Kill Switch
Replies: 25
Views: 1747

Re: Quick Release Kill Switch

Oh? Good to know. I know it's mostly a thermal barrier but I figured it was abrasion resistant too.
by Kodin
Feb 04 2016 11:49am
Forum: E-Bike Technical
Topic: Liquid Cooling MXUS 3000 using a Kit from Linukas
Replies: 45
Views: 9264

Re: Liquid Cooling MXUS 3000 using a Kit from Linukas

For future reference, going with two ABEC1 bearings stacked vs. one ABEC5, you may still get better results from more bearings; there's been a few whitepapers where people have built high accuracy spindles by stacking deep groove bearings 3-4 high rather than use super expensive tapered roller beari...
by Kodin
Feb 04 2016 8:56am
Forum: E-Bike Technical
Topic: Quick Release Kill Switch
Replies: 25
Views: 1747

Re: Quick Release Kill Switch

They also make fiberglass-lined silicone high-temp sleeve as well. (fiberglass on the inside)
by Kodin
Feb 04 2016 8:32am
Forum: E-Bike Technical
Topic: Cable connector protection
Replies: 3
Views: 519

Re: Cable connector protection

Self-vulcanizing silicone cable tape is a great option if you want to hermetically seal in-line cable connectors. They also make 4-gang powerpole 45A rubber boots, but in both cases, you lose the venting capability of the connectors. As such, be careful how much power you run through your connectors...
by Kodin
Jan 15 2016 9:04pm
Forum: E-Bike Reviews & Testing
Topic: Sabvoton SVMC072150 controller review, variable regen *PICS*
Replies: 347
Views: 74599

Re: Sabvoton SVMC072150 controller review, variable regen *P

IIRC... 4110 FETs are specced for 100 volt max. So the answer is of course maybe. Running close to the hairs edge on any component gets a bit iffy, and if the FETs aren't matched well they may cause failure if you're at or beyond the limits. Food for thought?
by Kodin
Jan 07 2016 4:18pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223287

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

That's a great tip about using thermal grease for the side covers! Now I know what to do with my huge tube of AS5... XD
by Kodin
Jan 07 2016 2:20pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223287

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

Oh derp.... The MXUS is 40mm that's right. Leafbike is 5mm smaller. Yeah I want to see that one sent to Justin.
by Kodin
Jan 07 2016 10:43am
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223287

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

The 35mm is the 1000W model, right? I am curious why the 1000W vs. The 1500W model...?

The 40mm model is the one I want to see on the sim. My reasoning is its the closest in spec to the similarly classed MXUS motor.
by Kodin
Jan 07 2016 4:28am
Forum: E-Bike Build Threads / Photos & Video
Topic: Tank Bike - (Previously: Yet Another Genesis)
Replies: 28
Views: 6552

Re: YAG - (Yet Another Genesis)

Got my MT5-ER40 collet chuck finally, so I cut a drawbar out of allthread for the collet holder and machined a large washer with welded nut to center on the other end of the spindle bore. Then I chucked up the part in a collet, bored the inner diameter a bit deeper, and finished up the cuts for the ...
by Kodin
Jan 07 2016 4:17am
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223287

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

Makes sense! Highest copper fill. Thanks for following up. :) It'll be nice to see this one finally added to the simulator when Justin has the time to dyno.
by Kodin
Jan 06 2016 11:08pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223287

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

As I'm still engineering a cassette mount for my 5T, no, you can't convert a motor set up for freewheel to freehub; the shaft would need to be reduced to the point that I wouldn't really trust it to be safe. If anything you MIGHT be able to get away with a custom-made 14-15mm (I forget exactly) shaf...
by Kodin
Jan 06 2016 10:35pm
Forum: E-Bike Technical
Topic: Turning 4130 - Now 4340
Replies: 11
Views: 1847

Re: Turning 4130 - Now 4340

So I got the wedge-type tool post, and found a problem; the Grizzly mounting bolt has a neck at the base that aligns the Grizzly toolpost, however it won't work on my wedge-style non-Grizzly model. https://zoom-pan-tilt.smugmug.com/photos/i-J2HBW7r/0/L/i-J2HBW7r-L.jpg https://zoom-pan-tilt.smugmug.c...
by Kodin
Dec 18 2015 1:30pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223287

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

Looks a bit narrow; that the 1000 or 1500W motor? Looks more like the 25mm stator 1000W model if it's even the same motor internally; side covers are used by tons of motors so it can sometimes be a crap-shoot to buy one sight-unseen online.
by Kodin
Dec 17 2015 2:10am
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1589
Views: 223287

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

A: shipping will likely bring it to the same price. B: until you can see the inside of the motor you can't be sure it's the same. To post a link grab the URL and hit the URL button then put it between the square bracket blocks.