Search found 36 matches

by liontail
Apr 22 2018 5:22pm
Forum: E-Bike Technical
Topic: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers
Replies: 165
Views: 17287

Re: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers

Next up, the two suspension forks! Anyone wanna take wagers on the failure torque with the magnesium Rock Shocks or the steel Suntour units? Here's a closeup of the dropouts in each case: Suspension Dropouts.jpg The Magnesium fork's dropouts look quite thick... but magnesium is a bit weaker than mo...
by liontail
Apr 03 2018 12:51pm
Forum: E-Bike Technical
Topic: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers
Replies: 165
Views: 17287

Re: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers

Thank you for taking the time to document this and make it publicly available, Justin! I've been somewhat involved in this project, but am continuously amazed by the time and care that you bring to the projects you take on. Seems that the torque arm failures are from the arm's teeth progressively fa...
by liontail
Jan 24 2017 6:37pm
Forum: E-Bike Non-hub Motor Drives
Topic: How to remove spindle on BBS01?
Replies: 1
Views: 264

How to remove spindle on BBS01?

Hi everyone, I'm trying to get to the bottom of an issue I'm having with a Bafang BBS01, and I can't seem to get the bottom bracket spindle out. All of the instruction videos assume that there's a 4-tab nut on the outside of the unit. That's not the case with mine: BBS01 BB Spindle Outside.jpg What ...
by liontail
Jan 01 2017 3:40pm
Forum: E-Bike Non-hub Motor Drives
Topic: Bafang BBSxx - fault finding and fixes
Replies: 1040
Views: 159881

Re: Bafang BBSxx - fault finding and fixes

Doesn't look any different to mine, although I pack it out with grease when it gets a little noisy.
It's impossible to really tell from your image, but your larger gear doesn't look worn like mine.

Anyone else ever had a gear that looked like this, and experienced a weird feeling from the drive?
by liontail
Dec 30 2016 4:57pm
Forum: E-Bike Non-hub Motor Drives
Topic: Bafang BBSxx - fault finding and fixes
Replies: 1040
Views: 159881

Re: Bafang BBSxx - fault finding and fixes

[attachment=0]Bafang Outer Gear Wear.jpg[/attachment]Hey all- I've been searching and reading through this thread in the hope of finding someone with the same BBS problem that I'm experiencing, but haven't found it. I apologize if this is a redundant post! My BBS system gives a shuddering/vibrating ...
by liontail
Nov 26 2016 2:20pm
Forum: E-Bike General Discussion
Topic: Max current for 9-pin motor connectors
Replies: 10
Views: 1108

Re: Max current for 9-pin motor connectors

Hey Dogman Dan -

That's awesome feedback. In your test, are you saying you're running 14S and 22A max current?

1000W seems like a reasonable max.

Thanks!
by liontail
Nov 19 2016 4:58am
Forum: E-Bike General Discussion
Topic: Max current for 9-pin motor connectors
Replies: 10
Views: 1108

Max current for 9-pin motor connectors

What is the maximum current (and voltage) that the standard moulded 9-pin motor connector can tolerate? I'm talking about this connector: julet 9-pin motor connector.jpg I searched around on the forum, and got unsubstantiated answers between 12 amps and 30 amps. I didn't find any reports of a failur...
by liontail
Jul 20 2015 10:59pm
Forum: Motor Technology
Topic: Roller brake front motor - whines under load
Replies: 0
Views: 336

Roller brake front motor - whines under load

I bought a small geared front hub motor - I think it's a Bafang - from a chinese alibaba vendor: 2.jpg It's not a motor I've ever worked with before. I'm pairing it to this controller and an LCD from BMS battery: https://bmsbattery.com/ebike-kit/546-s06s-250w-torque-simulation-sine-wave-controller-e...
by liontail
Apr 22 2015 1:53pm
Forum: E-Bike Non-hub Motor Drives
Topic: How to eliminate pulsing/cogging on Bafang BBS
Replies: 0
Views: 411

How to eliminate pulsing/cogging on Bafang BBS

I've played around with a few different BBS0X's, and in general I've found that they're pretty smooth, quiet, quality units. However, the pulsing/cogging in the lower PAS modes at low motor RPMs is driving me crazy! I find this problem is much worse on the BBS02 - I purchased mine (a 36V 500W) about...
by liontail
Apr 06 2015 10:08am
Forum: Motor Technology
Topic: Cute Q100H - not reassembling properly...
Replies: 10
Views: 1405

Re: Cute Q100H - not reassembling properly...

Thank you, Dani85, for the help! Placing the gears as you mentioned did make reassembly smoother. Now the motor doesn't freewheel in reverse, and there's a lot of drag - certainly more than there should be - in both directions. On the axle between the gears (shown in Dani85's pic above) there is a s...
by liontail
Mar 27 2015 12:30pm
Forum: Motor Technology
Topic: Cute Q100H - not reassembling properly...
Replies: 10
Views: 1405

Re: Cute Q100H - not reassembling properly...

I haven't tried powering it back up, as I'd have to literally pound the side cover onto these gears. 2 of the 3 gears' teeth line up with the ring gear of the side cover, but not the third - they directly interfere. I think the side cover should just side right on... If I don't hear from anyone else...
by liontail
Mar 27 2015 12:24pm
Forum: Motor Technology
Topic: Cute Q100H - not reassembling properly...
Replies: 10
Views: 1405

Cute Q100H - not reassembling properly...

I'm using a Q100H mid-drive for a customized utility bike. I had to cut down the axles, and in the process stripped a screw that then required complete disassembly of the motor to properly fix. The motor seems locked up as I'm putting it back together. Notably, the planetary gears seem to be stuck -...
by liontail
Feb 19 2015 1:00am
Forum: E-Bike Technical
Topic: Has anyone bought the Panasonic 18650PF from BMS Battery
Replies: 13
Views: 1352

Re: Has anyone bought the Panasonic 18650PF from BMS Battery

I'm really curious about these cells. They have them stuffed into the nicer lockable frame mounted packs, and I'm considering ordering a couple to see how they handle.

If anyone else has had experience with them I'd love an update!
by liontail
Feb 04 2015 2:57pm
Forum: E-Vehicles General Discussion
Topic: DIY Ebrake sensor - which reed switch?
Replies: 18
Views: 5077

Re: DIY Ebrake sensor - which reed switch?

I've been playing around with ebrake sensors, and I've settled on my favorite: http://em3ev.com/store/index.php?route=product/product&product_id=196 Super easy to use, NC, ready to go. Just 2 wires, too! You can also get them here: http://www.elifebike.com/peng/iview.asp?KeyID=dtpic-2014-C5-0JU4.7TTSP
by liontail
Jan 22 2015 3:21pm
Forum: E-Bike Non-hub Motor Drives
Topic: Best RC motor for lightweight utility bike build
Replies: 22
Views: 4668

Re: Best RC motor for lightweight utility bike build

Hey all, Thanks for the responses. Since we're in a time crunch on this project, and I still don't have confidence that I'll be able to do a good RC drive, I've decided to abandon an RC mid-drive in favor of a hub motor. But... will that hub motor actually be mounted as a hub? We'll see! Further dis...
by liontail
Jan 21 2015 2:40pm
Forum: E-Bike Non-hub Motor Drives
Topic: Best RC motor for lightweight utility bike build
Replies: 22
Views: 4668

Re: Best RC motor for lightweight utility bike build

It may be helpful to give a little more information - it would be great to run this motor at 36V to pair with standard ebike batteries (we're eyeing the AllCell Summit). So that's 36V @ 2000 rpm... either of those numbers can change if there aren't any smallish (<2.5 lbs) BLDC outrunner motors that ...
by liontail
Jan 19 2015 8:14pm
Forum: E-Bike Non-hub Motor Drives
Topic: Best RC motor for lightweight utility bike build
Replies: 22
Views: 4668

Re: Best RC motor for lightweight utility bike build

Ok, reorienting back to my original question... :) Were it me, I'd get a v4 Recumpence reduction and mount a minimum 3210 Astro Flight motor. I think that we can figure out the gear reduction ourselves - we have full access to a pretty incredible student machine shop - but the Astro 32xx does seem t...
by liontail
Jan 17 2015 1:42pm
Forum: E-Bike Non-hub Motor Drives
Topic: Best RC motor for lightweight utility bike build
Replies: 22
Views: 4668

Best RC motor for lightweight utility bike build

Hey all, I’m leading a team of mechanical engineering students building an ebike for a senior capstone project. I live in the pacific northwest (USA), and a recent survey found the top 5 barriers to bicycling in this area are: 1) The weather 2) Places I need to go are too far 3) The hilly terrain 4)...
by liontail
Jan 17 2015 1:33pm
Forum: E-Bike Non-hub Motor Drives
Topic: Two Questions - BB Drive Systems
Replies: 16
Views: 1951

Re: Two Questions - BB Drive Systems

1.) BBS-02 : Are there aftermarket crank arms which are a bolt on replacement but stronger for bikes that take a beating or have a powerful or heavy rider? My local bike shop offers Heli-Coil thread replacements for crankarms. It's pretty cheap (they charge $25) and they swear by them. I've used th...
by liontail
Jan 12 2015 2:55pm
Forum: E-Vehicles General Discussion
Topic: DIY Ebrake sensor - which reed switch?
Replies: 18
Views: 5077

Re: DIY Ebrake sensor - which reed switch?

Justin, you rock! In one line you got me on the right track. For those who like me didn't know this, an SPDT reed switch stands for "Single Pull Double Throw", and it has 3 leads - common, normally closed (NC, and normally open (NO). It turns out there are a lot more of these sensors. However, I'm n...
by liontail
Jan 11 2015 9:49pm
Forum: E-Vehicles General Discussion
Topic: DIY Ebrake sensor - which reed switch?
Replies: 18
Views: 5077

DIY Ebrake sensor - which reed switch?

Hi, I'm trying to figure out the best way to get ebrake functionality without having to use an actual ebrake lever. I'm tired of these cheap levers, and of course you can't use them for hydro! I've searched the forums for the reed switches folks from here have used, but pretty much all of them seem ...
by liontail
Jan 05 2015 6:45pm
Forum: Motor Technology
Topic: Proper controller
Replies: 15
Views: 1776

E-Trike controller replacement?

Hi! I'm attempting to help out a friend who has a big electric cargo trike that recently stopped working. The original controller didn't respond at all (no voltage between throttle red and black, for example), so I decided to use one of em3ev's as a replacement (the 6 FET IRFB3077 INFINEON) and got ...
by liontail
Dec 30 2014 6:01pm
Forum: Battery Technology
Topic: Connecting 10S Li-ion and 12S LiFePO4 in parallel
Replies: 7
Views: 910

Re: Connecting 10S Li-ion and 12S LiFePO4 in parallel

I ended up getting the diodes that I had linked to earlier. Supposedly, they're rated to 20 amps each, and my setup was unlikely to draw more than 10A from the li-ion battery. Still, I was concerned that the diode simply looked so small, so I used two. I decided to attach them using JST-sm type fema...
by liontail
Dec 19 2014 2:11am
Forum: Battery Technology
Topic: Connecting 10S Li-ion and 12S LiFePO4 in parallel
Replies: 7
Views: 910

Re: Connecting 10S Li-ion and 12S LiFePO4 in parallel

I ended up getting these: http://www.amazon.com/20L15T-Single-Schottky-Rectifier-TO-220AC/dp/B008LTKBBA/ref=sr_1_3?ie=UTF8&qid=1418972529&sr=8-3&keywords=schottky+diode&pebp=1418972533953 Cheap and quick shipping on amazon. I'm wandering in the dark here - I don't know a TVS diode from a schottky fr...
by liontail
Dec 18 2014 6:34pm
Forum: Battery Technology
Topic: Connecting 10S Li-ion and 12S LiFePO4 in parallel
Replies: 7
Views: 910

Re: Connecting 10S Li-ion and 12S LiFePO4 in parallel

Thanks dnmum! Your explanation makes total sense. However, if I use a 15V diode and for some reason the li-ion pack isn't connected (or shuts off due to low voltage), there would be a full 36V drop over the diode. Is that ok if there isn't any current flowing through it? What do you think of these? ...