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by spinningmagnets
Jan 26 2020 8:30am
Forum: E-Bike Technical
Topic: 1.60" or 1.85" wide rim for street?
Replies: 7
Views: 515

Re: 1.60" or 1.85" wide rim for street?

I have 3.5-inch wide tires on my street commuter, and I like the fatter contact patch. There is some argument over whether a fatter street-tread tire (not knobbies) has better traction in slippery conditions like ice and snow, but for a dry smooth asphalt pavement, a fat tire with street tread is my...
by spinningmagnets
Jan 26 2020 8:24am
Forum: E-Bike General Discussion
Topic: Type of wire for phase wires
Replies: 3
Views: 67

Re: Type of wire for phase wires

The 12AWG multi-strand flexible wire with silicone insulation is quite good as motor phase wire.

Image
by spinningmagnets
Jan 25 2020 1:43pm
Forum: General Discussion
Topic: World Domination, I just got my self a 3d Printer!!!
Replies: 641
Views: 70362

Re: World Domination, I just got my self a 3d Printer!!!

Kevlar/carbon-fiber reinforced 3D printing filament. The resulting part is reported to be 3 times stronger than ABS, and equal to aluminum. Expensive now, maybe more affordable in a year or so.

https://all3dp.com/1/best-carbon-fiber- ... ter-price/

by spinningmagnets
Jan 25 2020 11:28am
Forum: Battery Technology
Topic: Salvaged EV cells index: Leaf, Volt, Tesla, Zero, etc
Replies: 66
Views: 19563

Re: Salvaged EV cells index: Leaf, Volt, Tesla, Zero, etc

I agree about the pics. On occasion I have linked to a pic to save time, but when a picture is important to the post and the treasure of info here, I save the pic to my laptop and then upload it. I'm afraid I don't have the power to change that here on ES. So many great pics have been lost in the ol...
by spinningmagnets
Jan 25 2020 10:46am
Forum: Battery Technology
Topic: Magnets to hold bus onto cell, no-weld no-solder
Replies: 10
Views: 153

Re: Magnets to hold bus onto cell, no-weld no-solder

I need some practice drawing in Pinta. This kind of drawing works very well in MS Paint, but I am no longer using Windows, and went to Linux. CellCopperMagnet1.jpg The parallel strip that connects one copper series strip to the other one can be a separate wire, copper or nickel, it can be located an...
by spinningmagnets
Jan 25 2020 8:19am
Forum: Battery Technology
Topic: Magnets to hold bus onto cell, no-weld no-solder
Replies: 10
Views: 153

Re: Magnets to hold bus onto cell, no-weld no-solder

That looks good. The only connection of design concern is the series connections. The parallel connections are quite easy to make, and you can even solder a thin copper wire across the center of several copper ribbons to make the HHH shape. As I said before, nickel is a great material for the parall...
by spinningmagnets
Jan 24 2020 11:26pm
Forum: E-Bike General Discussion
Topic: Covering 18650 cells with epoxy resin
Replies: 20
Views: 486

Re: Covering 18650 cells with epoxy resin

A discussion about using magnets to hold bus ribbon onto cell-ends has been moved here.

viewtopic.php?f=14&t=104405
by spinningmagnets
Jan 24 2020 11:15pm
Forum: Battery Technology
Topic: Magnets to hold bus onto cell, no-weld no-solder
Replies: 10
Views: 153

Magnets to hold bus to cell, no-weld no-solder

edit: John, I don't know if a magnetic field interferes with current, thats a good question, needs an experiment. The previous battery pack builds like this seemed to work OK, so I'd be willing to risk the cost on my next pack build just to see. The magnets are cheap, and if it didn't work out, the ...
by spinningmagnets
Jan 24 2020 4:49pm
Forum: Battery Technology
Topic: Magnets to hold bus onto cell, no-weld no-solder
Replies: 10
Views: 153

Re: Covering 18650 cells with epoxy resin

I don't have any info on these builds. The top one was published and the builder was thinking about making the kits for sale, so he stopped posting the info. Its a flexible rubber sheet, electrically insulating, possibly silicone. I don't recall info about the lower one either. I simply saw that it ...
by spinningmagnets
Jan 24 2020 1:27pm
Forum: Items for Sale - Used
Topic: Nissan Leaf Modules 58 aH
Replies: 17
Views: 718

Re: Nissan Leaf Modules 58 aH

Seven of these modules are 14S, and that makes an AWESOME home power back-up. If your power ever goes out, an inverter will convert these into 120V AC to run your TV, refrigerator, laptop, cell-phone, etc...(If I lived within a days round-trip drive, I would have bought these...) https://endless-sph...
by spinningmagnets
Jan 24 2020 1:18pm
Forum: Battery Technology
Topic: Magnets to hold bus onto cell, no-weld no-solder
Replies: 10
Views: 153

Magnets to hold bus onto cell, no-weld no-solder

This subject came up in another thread, and I have moved it to its own thread, due to the renewed interest.... Original thread found here: http://endless-sphere.com/forums/viewtopic.php?f=3&t=104395 Although metal magnets conduct electricity, they have high resistance, so I would experiment with mag...
by spinningmagnets
Jan 24 2020 11:04am
Forum: Motor Technology
Topic: Revolt RV-series motor review and comparisons
Replies: 282
Views: 26438

Re: Revolt RV-series motor review and comparisons

Hey, Lars. I've read that previous post twice, and I'm trying hard to find the part about electric motors. It sort of sounds off topic, but...I don't want to be accused of censoring valuable electric motor posts...

Have at it, fellas...(*grabs popcorn and takes a comfortable seat)
by spinningmagnets
Jan 24 2020 9:55am
Forum: E-Bike General Discussion
Topic: Covering 18650 cells with epoxy resin
Replies: 20
Views: 486

Re: Covering 18650 cells with epoxy resin

Getting back to your original question about an epoxy shell holding the buses against the cell-ends. Heat/cold will cause expansion/contraction, and I don't think the epoxy would maintain a constant pressure. The cells and the epoxy might not expand/contract at the same rate... Concerning the use of...
by spinningmagnets
Jan 24 2020 9:39am
Forum: General Discussion
Topic: Fast, best ROI speed pedelec for a heavy guy
Replies: 4
Views: 281

Re: Fast, best ROI speed pedelec for a heavy guy

A long uphill tells me you might be best served by a mid drive, that way you can downshift whe you get to a hill (as opposed to a hubmotor having one "speed"). I have a BBSHD at 1500W, and after I swapped to a smaller chainring, my top speed is around 25-MPH, but in low gear, it can climb anything i...
by spinningmagnets
Jan 24 2020 9:27am
Forum: E-Bike General Discussion
Topic: Covering 18650 cells with epoxy resin
Replies: 20
Views: 486

Re: Covering 18650 cells with epoxy resin

It's not technically difficult to make a compression box, so that when the outer side-plates are fully bolted down, the interior dimensions are locked into a precise distance apart. Once you have calculated the length of the 18650 cells and added the thickness of the conducting buses, there was a lo...
by spinningmagnets
Jan 24 2020 9:12am
Forum: E-Bike General Discussion
Topic: Covering 18650 cells with epoxy resin
Replies: 20
Views: 486

Re: Covering 18650 cells with epoxy resin

Zero motorcycles fully pot their batteries in epoxy. If you are considering potting for the water-resistance, maybe try a small 12V pack with silicone first. If your electrical connection method isn't working out, you can cut away the silicone and try something else with the cells. Epoxy is hard eno...
by spinningmagnets
Jan 23 2020 7:04pm
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1528
Views: 204848

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

Here's a thread about doubling the phase wires of a BPM geared hub. Of course it's not a Leafbike 1500W, but there are a lot of similarities.

http://endless-sphere.com/forums/viewto ... 37#p758156
by spinningmagnets
Jan 23 2020 6:59pm
Forum: E-Bike Non-hub Motor Drives
Topic: BBS02 or BBSHD for my wife's hardtail
Replies: 7
Views: 194

Re: BBS02 or BBSHD for my wife's hardtail

You may already know this, but it's very beneficial to run a smaller chainring. Test the stock chainring for top speed on flat land, and if you can live with 10% less top speed, get a chainring that has 10% fewer teeth. You will suddenly notice it doesn't quite bog down as much as before, and the mo...
by spinningmagnets
Jan 23 2020 12:14pm
Forum: Vendor Relations Corner
Topic: I will never buy from Luna Cycle again, if I don't have to
Replies: 22
Views: 2747

Re: I will never buy from Luna Cycle again, if I don't have to

As a moderator, I recuse myself from any conflicts involving Luna Cycle. Before I was asked to help with moderating (*mostly nuking spam, but sometimes locking flame-threads), I wrote articles for electricbike.com I still write, and get paid per article. When Barent was asked if he would be be willi...
by spinningmagnets
Jan 23 2020 8:12am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Why are two speed transmissions not more prevalent?
Replies: 6
Views: 271

Re: Why are two speed transmissions not more prevalent?

ES veteran Thud built a tiny 2-speed for racing a bicycle. Derailleurs and cassettes were not strong enough for his application.

viewtopic.php?f=28&t=8644&start=150#p195730

The Porsche Taycan uses a 2-speed on the rear, one-speed on the front.
by spinningmagnets
Jan 22 2020 7:37pm
Forum: E-Vehicles General Discussion
Topic: Which System for an Electric Car?
Replies: 15
Views: 260

Re: Which System for an Electric Car?

Soon, you will read responses about "unsprung weight". This means you want the wheels to be as light as possible. The famous Jaguar rear-end moved the disc brakes from the rear wheels to the sides of the differential to reduce the weight at the wheels. It is actually reasonable to use two rear hubmo...
by spinningmagnets
Jan 22 2020 7:32am
Forum: Motor Technology
Topic: Leaf / leafmotor / leafbike high efficiency 1500w motor
Replies: 1528
Views: 204848

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

One of the nice things about brushless motors is that they are very tolerant of a wide range of voltages. As far as how many amps to use, it all depends on how often you'll be using high amps. I feel the ideal temp is around 140F, but it is widely regarded to keep the motor safe by not exceeding 93C...
by spinningmagnets
Jan 21 2020 8:30pm
Forum: Vendor Relations Corner
Topic: I will never buy from Luna Cycle again, if I don't have to
Replies: 22
Views: 2747

Re: I will never buy from Luna Cycle again, if I don't have to

My record clearly shows I am a shill. Feel free to search my post-history. There's no use denying it...
by spinningmagnets
Jan 18 2020 7:19pm
Forum: General Discussion
Topic: What's with this censoring nonsense happening on the forum?
Replies: 81
Views: 4406

Re: What's with this censoring nonsense happening on the forum?

If you look at both of the contested threads, there are many posts from John and others that remain in the thread. So..."the original disagreement" remains in both of those threads.

If you re-read those threads, it becomes very clear what Johns position is, and clear what EGs position is.