Search found 22 matches

by thanar
Apr 12 2019 9:48am
Forum: E-Bike Technical
Topic: Hub motor cracking noise
Replies: 24
Views: 1091

Re: Hub motor cracking noise

Are you referring to the freewheel of the back wheel, or the freewheel inside the motor (I suspect the is one build into there)? The motor wheel is the front motor, so it’s not from the back wheel’s freewheel.
by thanar
Apr 10 2019 8:46am
Forum: E-Bike Technical
Topic: Hub motor cracking noise
Replies: 24
Views: 1091

Re: Hub motor cracking noise

My slo-mo video on the working motor covers all freewheel case, magnets and nylon gears, I believe. I see no issues whatsoever with the motor itself: https://youtu.be/nxUOtitpIe0
by thanar
Apr 09 2019 6:19am
Forum: E-Bike Technical
Topic: Hub motor cracking noise
Replies: 24
Views: 1091

Re: Hub motor cracking noise

The noise IS fixed to wheel rotation, it just changes in volume and type, depending on the wheel slant and weight applied. I did try the cap bearing when I opened the motor, but not thouroughly enough, didn’t test it under force. I will be replacing ball bearings soon; I suspect they are using beari...
by thanar
Apr 08 2019 12:10pm
Forum: E-Bike Technical
Topic: Hub motor cracking noise
Replies: 24
Views: 1091

Re: Hub motor cracking noise

:x :x :x
Noise came back just a 5km ride later, slowly ramping up the volume to previous levels.
What do I try next? Spokes rubbing together has been ruled out by placing thick electrical tape where they touch, noise still the same. Maybe spokes bases? Noise comes from the center of the wheel.
by thanar
Apr 07 2019 11:38pm
Forum: E-Bike Technical
Topic: Hub motor cracking noise
Replies: 24
Views: 1091

Re: Hub motor cracking noise

The cover sure had a lip and it was tight enough that I had to apply quite some force to open it, but I don’t know, it’s fixed now. Will let you know if the noise finds its way back.
by thanar
Apr 07 2019 3:03pm
Forum: E-Bike Technical
Topic: Hub motor cracking noise
Replies: 24
Views: 1091

Re: Hub motor cracking noise

Also did a nice slo-mo video of the hub motor in action:
https://youtu.be/nxUOtitpIe0
by thanar
Apr 07 2019 2:48pm
Forum: E-Bike Technical
Topic: Hub motor cracking noise
Replies: 24
Views: 1091

Re: Hub motor cracking noise

So I took apart the motor. Axle and gears all solid, no sign of wear. Applied some extra lithium grease. Removed a very small piece of loose wire that was included as a bonus from the Chinese manufacturer, however I don’t think this was the culprit (visible in attached photos). Close the motor and t...
by thanar
Mar 21 2019 2:16am
Forum: E-Bike Technical
Topic: Hub motor cracking noise
Replies: 24
Views: 1091

Re: Hub motor cracking noise

Broken axle... hm, I didn’t think of that... that could also possibly explain why the sound is further amplified when I ride off center to the left, with the bike leaning to the right, and it almost completely eliminates if u ride the other way? Spokes or axle it is then. Will investigate further an...
by thanar
Mar 20 2019 12:58pm
Forum: E-Bike Technical
Topic: Hub motor cracking noise
Replies: 24
Views: 1091

Re: Hub motor cracking noise

Everything is tight and checked by a professional. Then only think we didn’t do is remove the tire and check the spokes nuts to see if there’s any issues on the rim’s double wall. Oh, and crack the hub motor open, of course.
by thanar
Mar 20 2019 10:43am
Forum: E-Bike Technical
Topic: Hub motor cracking noise
Replies: 24
Views: 1091

Re: Hub motor cracking noise

Here’s the video I promised:
https://youtu.be/WuREP1pscVc
It really sounds like it’s the spokes, I still haven’t removed the tire to examine spokes nuts.
by thanar
Mar 20 2019 8:46am
Forum: E-Bike Technical
Topic: Hub motor cracking noise
Replies: 24
Views: 1091

Re: Hub motor cracking noise

Thanx for chiming in. Brakes, rim, spokes, tire have all been checked. The noise is coming from inside the hub and is being amplified by the spokes. The period of the noise is on each tire rotation. Will try to upload a video of the issue.
by thanar
Mar 19 2019 7:18am
Forum: E-Bike Technical
Topic: Hub motor cracking noise
Replies: 24
Views: 1091

Hub motor cracking noise

Hello community, It’s been a while now that my front Chinese hub motor has been doing cracking noises when riding. Only when riding. There is no bearing gaps whatsoever. I found a similar case on YouTube: https://youtu.be/Z1tkmlh7fsQ Any ideas? It’s getting worse. I thought it was the spokes, but I ...
by thanar
Aug 02 2018 12:44pm
Forum: Battery Technology
Topic: Rebuild of a 36V/12Ah lead-acid battery
Replies: 19
Views: 1557

Re: Rebuild of a 36V/12Ah lead-acid battery

Cooper can tyrn green over time in a battery connection. Plus some spot welders we're having trouble with copper. How about copper strips plated with nickel or some other plating material. Would be custom or time involved. You cannot spot weld copper because spot welding actually requires high resi...
by thanar
Aug 02 2018 11:18am
Forum: Battery Technology
Topic: Rebuild of a 36V/12Ah lead-acid battery
Replies: 19
Views: 1557

Re: Rebuild of a 36V/12Ah lead-acid battery

I have been testing a couple nickel strips I got from different sources. Testing voltage drop @1A, both strips 0.15mm thickness, 8mm width. Results vary a lot: Strip I got from Banggood, EU warehouse: 0.3V@1A (2m length) -> 150mΩ/m Strip I got from random eBay seller: 0.09V@1A (1.5m length) -> 60mΩ/...
by thanar
Jul 27 2018 3:38pm
Forum: Battery Technology
Topic: Rebuild of a 36V/12Ah lead-acid battery
Replies: 19
Views: 1557

Re: Rebuild of a 36V/12Ah lead-acid battery

Cells are new LGs at 2250mAh/10A continuous. They all measured 3.60-3.61V when put together. I know of the S/P strips, have ordered some, but take some time. The pack was covered with thin foamy material, leaving the BMS cooling plate outside. It was then put into the original 3x12V lead-acid batter...
by thanar
Jul 27 2018 9:57am
Forum: Battery Technology
Topic: Rebuild of a 36V/12Ah lead-acid battery
Replies: 19
Views: 1557

Re: Rebuild of a 36V/12Ah lead-acid battery

Finished:
IMG_7203_sm.jpeg
(short cable from battery to BMS should be blue)
by thanar
Jul 25 2018 4:11pm
Forum: Battery Technology
Topic: Rebuild of a 36V/12Ah lead-acid battery
Replies: 19
Views: 1557

Re: Rebuild of a 36V/12Ah lead-acid battery

Seems like I forgot something... but then again, why not leave it as is? What's the dirrerence? High currents go through series connections anyway! (Talking about not adding half the parallel strips).

97FF9478-5C16-47B1-BE8E-B678F87639E1.jpeg
97FF9478-5C16-47B1-BE8E-B678F87639E1.jpeg (81.29 KiB) Viewed 1266 times
by thanar
Jul 10 2018 9:45am
Forum: Battery Technology
Topic: Rebuild of a 36V/12Ah lead-acid battery
Replies: 19
Views: 1557

Re: Rebuild of a 36V/12Ah lead-acid battery

I don't think it makes a different which you do first, parallels or series connections; are you saying that the current having to go through an extra 0.15mm of nickel will add to the total resistance of the battery? By how much? Frankly, I do the parallel strip first because it makes the whole pack ...
by thanar
Jul 05 2018 2:08am
Forum: General Discussion
Topic: Adding pictures?
Replies: 188
Views: 348862

Re: Adding pictures?

Are there any other limitations to uploading pictures, besides pixel count size and file size? I can't seem to be able to upload, no matter what I try. I always get a notice icon at the attachment table, and clicking on it give out the information "Could not upload attachment to ./files/57805_60b1e5...
by thanar
Jul 05 2018 1:58am
Forum: Battery Technology
Topic: Rebuild of a 36V/12Ah lead-acid battery
Replies: 19
Views: 1557

Re: Rebuild of a 36V/12Ah lead-acid battery

I finally opted for a 4P design, mainly because my battery holders are 5x4!
Here's a couple of pictures:
IMG_7070_text_sm.jpeg
IMG_7070_text_sm.jpeg (163.42 KiB) Viewed 1370 times
Please let me know what you think of my spot welding:
IMG_7074.JPG
by thanar
Jun 13 2018 12:16pm
Forum: Battery Technology
Topic: Rebuild of a 36V/12Ah lead-acid battery
Replies: 19
Views: 1557

Re: Rebuild of a 36V/12Ah lead-acid battery

999zip999 wrote:
Jun 13 2018 12:11pm
How are you going to connect the batteries do you have a spot welder ?
I have grown quite adept at using a DIY solenoid relay spot welder.
by thanar
Jun 13 2018 3:47am
Forum: Battery Technology
Topic: Rebuild of a 36V/12Ah lead-acid battery
Replies: 19
Views: 1557

Rebuild of a 36V/12Ah lead-acid battery

Hello, I have an old 3S 12Ah lead-acid battery pack that's too heavy for my needs, and too old for being any good. It's being used on a 250W nominal e-bike. Instead of replacing the lead-acids which would cost around €160, I am thinking of building a pack with Sony Konion US18650V3 2250mAh cells, ar...