Search found 127 matches

by TDB
May 14 2021 9:18pm
Forum: EBike General Discussion
Topic: Gadgets on your eBike that you couldn't live without
Replies: 88
Views: 5567

Re: Gadgets on your eBike that you couldn't live without

CA tells me voltage and something of capacity, but I don't bother. CA Watts and Wh/km is more useful than battery remaining. If I want to know what is going on inside my battery I connect app to BT BMS. Phone is on my bars for rear view gadget so it is easy.
by TDB
May 12 2021 8:50pm
Forum: EBike General Discussion
Topic: E-bike mid-drive motors hardly outperforms hub motors
Replies: 93
Views: 3102

Re: E-bike mid-drive motors hardly outperforms hub motors

I wrote an article where you can read that a mid-drive motor hardly outperforms a hub motor. https://www.avdweb.nl/solar-bike/hub-motor/mid-drive-vs-hub https://www.avdweb.nl/Mavik%20thumbnails/Article_files/Solarbike/Images-hub-motors/Mid-drive-motor-Slope8-Cadence-70rpm-no-pedaling-fill-469x253.j...
by TDB
May 11 2021 12:16am
Forum: EBike General Discussion
Topic: Gadgets on your eBike that you couldn't live without
Replies: 88
Views: 5567

Re: Gadgets on your eBike that you couldn't live without

Newest additions are TKstar TK905 tracker and WSDcam alarm. Tracker supplements my old iPhone. Both are concealed. All mounted on the trailer.

In some countries neither might not do much good but here they are far less common so are unexpected.
by TDB
May 10 2021 7:50pm
Forum: Motor Technology
Topic: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?
Replies: 109
Views: 3776

Re: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?

How about a **thermally conducting** (& obviously dielectric insulating) "potting" sealant that starts out in liquid form? Use that to coat all the (possibly reactive) components, seal up any (possibly leak prone) gaps let it thoroughly dry & cure. Then (if even needed) your perma...
by TDB
May 09 2021 8:57pm
Forum: Motor Technology
Topic: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?
Replies: 109
Views: 3776

Re: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?

The seals on cartridge bearings are for dust, not oil. That's why they're greased instead of oil lubricated. Please explain how you seal those against oil leakage while allowing them to turn. I'll get the part number off one of the ( three ) hub motors I have here and I;ll look it up to find its in...
by TDB
May 09 2021 5:50pm
Forum: Motor Technology
Topic: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?
Replies: 109
Views: 3776

Re: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?

In my G311 electrical parts including the phase and hall wires, windings, boards. string etc have ZERO exposure to ATF used to lubricate and cool. It cost less than 20ml of ER2225 high temperature and chemically compatible epoxy and was stupidly easy to do. And the entire materials compatibility and...
by TDB
May 02 2021 9:09am
Forum: EBike General Discussion
Topic: More newbie questions about USB ports and lights.
Replies: 11
Views: 334

Re: More newbie questions about USB ports and lights.

Thanks for answering. Well, yes. Similarities are present, lol.. The thing is, though. I got no more room to attach any more gadgets. Or cables for that matter. It already looks like a spiderweb. I whish it was possible to hide most of it inside the frame. But.. And that is my biggest headache. Eve...
by TDB
May 02 2021 8:02am
Forum: EBike General Discussion
Topic: More newbie questions about USB ports and lights.
Replies: 11
Views: 334

Re: More newbie questions about USB ports and lights.

I connect two batteries to controller and DC convertors using a 4 way patch lead and added a fuse to the battery side of the DC convertor. I can't think of a better way. Sounds like you are talking about something similar. Built in USB ports on battery or controller are probably best used only for l...
by TDB
May 01 2021 11:22pm
Forum: EBike General Discussion
Topic: 9/16"-20tpi Crankarm Footpegs?
Replies: 14
Views: 547

Re: 9/16"-20tpi Crankarm Footpegs?

... Work it out.
by TDB
May 01 2021 11:08pm
Forum: EBike General Discussion
Topic: 9/16"-20tpi Crankarm Footpegs?
Replies: 14
Views: 547

Re: 9/16"-20tpi Crankarm Footpegs?

That's not true... https://pivotpegz.com.au/pages/pivoting-action Saying stick to MTB pedals. Ah, interesting find. "Unique & patented", as they say though. Still wouldn't work on rotating cranks. I'm definitely not committed to the square tube experiment. I have no idea how it will c...
by TDB
Apr 26 2021 9:31pm
Forum: EBike General Discussion
Topic: Cycle Analyst - simple mounting bracket
Replies: 4
Views: 249

Re: Cycle Analyst - simple mounting bracket

I had considered something similar to above, but I needed a strong base for (evidence) camera and light. Light has since been moved back onto a separate mount and the Garmin (more important to me than CA) moved in front similar to camera. Also added DC-DC convertors for Garmin, Phone (mounted on the...
by TDB
Apr 26 2021 4:30am
Forum: EBike General Discussion
Topic: 9/16"-20tpi Crankarm Footpegs?
Replies: 14
Views: 547

Re: 9/16"-20tpi Crankarm Footpegs?

That's not true...

https://pivotpegz.com.au/pages/pivoting-action

Saying stick to MTB pedals.
by TDB
Apr 26 2021 2:12am
Forum: EBike General Discussion
Topic: 9/16"-20tpi Crankarm Footpegs?
Replies: 14
Views: 547

Re: 9/16"-20tpi Crankarm Footpegs?

Why limit yourself? In off-road motorcycling pegs that pivot are desirable because they offer good support at all angles.
by TDB
Apr 25 2021 11:10pm
Forum: EBike General Discussion
Topic: Bafang RM G310?
Replies: 9
Views: 598

Re: Bafang RM G310?

I have no idea the number of turns. I misspoke. Mine is 8.5kV which is the slowest motor.

The motor seals hold oil fairly well. I put a vent in with the wires to an overflow bottle to take the pressure off the seals. Think radiator overflow. It can burp a little when hot and draw it back as it cools.
by TDB
Apr 25 2021 9:31pm
Forum: EBike General Discussion
Topic: Bafang RM G310?
Replies: 9
Views: 598

Re: Bafang RM G310?

Mine is a very conservative setup. Pedal assist with a trailer. Not a motorcycle. It has original gears. I epoxy (ER2225) coated the windings and boards to protect it from ATF. I'd use EL601 if I had known about it sooner and could get the stuff. Nobody wants to ship it. Standard 10.5Kv wind, 52V pa...
by TDB
Apr 25 2021 7:24pm
Forum: EBike General Discussion
Topic: Bafang RM G310?
Replies: 9
Views: 598

Re: Bafang RM G310?

Interesting... I think most of the problems can be traced back to heat as the root cause. Heating the windings and sensors, heating the gears (and excessive torque), heating the epoxy holding the magnets on the rotor enough for them to separate at high rpm. Motor simulator doesn't help the cause wit...
by TDB
Apr 22 2021 11:20am
Forum: Motor Technology
Topic: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?
Replies: 109
Views: 3776

The Opticool Thread.

Bought two motors in a week. Today an Mxus XF39 30H. I believe Grin calls it a 3006. Price was too good. I don't know what I'll use it for, but I'll definitely coat it for use with mineral oil... or something.
by TDB
Apr 21 2021 5:21pm
Forum: Motor Technology
Topic: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?
Replies: 109
Views: 3776

Re: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?

If I can get tune the printed nylon gears for my g370 to work decently, I would have no problem with testing this. Getting any kind of transformer in my country in a smaller amount than 200 liter is difficult, though. Is there anywhere I can buy this in small amount online? It might be useful to pu...
by TDB
Apr 20 2021 8:19am
Forum: EBike Technical
Topic: Bafang G310 geared hub - 11:1 reduction ratio!!!
Replies: 239
Views: 45306

Re: Bafang G310 geared hub - 11:1 reduction ratio!!!

Sure :) Does this work, or does it just lead to my login or something else? The shop is called "46 Ebike Store". They also has the motors, so nice to have stored (g310, g311, g370) https://a.aliexpress.com/_mK6e4jp https://a.aliexpress.com/_mKETMxD Update: G370 gears are different to both...
by TDB
Apr 20 2021 1:54am
Forum: Motor Technology
Topic: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?
Replies: 109
Views: 3776

Re: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?

john61ct wrote:
Apr 20 2021 12:53am
TDB wrote:Do you have shares in Opticool? :)
He's not claiming it would work, just cheerleading for people to try testing it
He could try testing it himself.
by TDB
Apr 19 2021 11:09pm
Forum: Motor Technology
Topic: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?
Replies: 109
Views: 3776

Re: Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?

neptronix wrote:
Apr 19 2021 1:09pm
A liquid cooled motor would be very expensive to design, produce prototypes for, figure out how to manufacture, find suppliers for, etc.. why do that when $5 worth of opticool could get you awfully close with an existing motor design?
Do you have shares in Opticool? :)
by TDB
Apr 19 2021 12:39am
Forum: EBike Technical
Topic: Bafang G310 geared hub - 11:1 reduction ratio!!!
Replies: 239
Views: 45306

Re: Bafang G310 geared hub - 11:1 reduction ratio!!!

Could it use the same gears as G310/311? Those seem to be the same 18-33 gears for both motors and available at least on Aliexpress. Thanks! Found the shop on aliexpress. They had measurements for the gears, and turns out tve G310 and G311 uses very different gears. I will have to open up and measu...
by TDB
Apr 18 2021 6:54pm
Forum: EBike Technical
Topic: Bafang G310 geared hub - 11:1 reduction ratio!!!
Replies: 239
Views: 45306

Re: Bafang G310 geared hub - 11:1 reduction ratio!!!

I agree that mineral oil is a bad idea. The materials compatibility of silicone oil is also unknown to me. That's why i suggested opticool, which is based on isoparaffin, and the company has published lots of papers and data on materials compatiibility that looks VERY GOOD. Yet nobody has tried it,...
by TDB
Apr 17 2021 10:56pm
Forum: EBike Technical
Topic: Bafang G310 geared hub - 11:1 reduction ratio!!!
Replies: 239
Views: 45306

Re: Bafang G310 geared hub - 11:1 reduction ratio!!!

Heat and volatilisation of oil additives is probably as much a factor as time in the breakdown of components. Documented fretting of bearings was my number one reason for dropping mineral oil as a lubricant and coolant. While silicone oil is probably a good coolant I am not convinced it is a suitabl...
by TDB
Apr 16 2021 5:25pm
Forum: EBike Technical
Topic: Bafang G310 geared hub - 11:1 reduction ratio!!!
Replies: 239
Views: 45306

Re: Bafang G310 geared hub - 11:1 reduction ratio!!!

ATF seems to have issues with common wiring sheathing and some other electrical components, from what i remember hearing. No direct experience or pictures shown. Some Opticool formulations are designed specifically to be used in transformers which have materials like wood (yeah, wood!), nylon, othe...