Search found 11206 matches

by spinningmagnets
Apr 12 2021 10:17pm
Forum: EBike Troubleshooting
Topic: Accidental ebike newbie with controller and battery questions
Replies: 11
Views: 197

Re: Accidental ebike newbie with controller and battery questions

If you plan to actually haul cargo in that large cargo box, you would definitely be better served by a mid drive motor, so the motor has some gears to work with. The smallest I would use would be the 48V BBS02, and if you think you wouldn't get into trouble, a slightly larger 48V BBSHD would be idea...
by spinningmagnets
Apr 12 2021 12:04pm
Forum: EBike General Discussion
Topic: Tempted to lick my 50 volt battery
Replies: 44
Views: 708

Re: Tempted to lick my 50 volt battery

A hot dog or a raw chicken breast would be a good proxie for a human tongue. Touch the two wires onto the meat and see what happens. Your outer skin on your fingers has much more resistance than a wet tongue. It will result in a horrifying burn. It may not be spectacular with sparks, and sizzling wi...
by spinningmagnets
Apr 12 2021 11:53am
Forum: EBike Troubleshooting
Topic: Accidental ebike newbie with controller and battery questions
Replies: 11
Views: 197

Re: Accidental ebike newbie with controller and battery questions

If you add a temp sensor to the stator on the inside of the motor, you can run a surprising amount of watts through it, as long as it's only a temporary peak. The amps cause the majority of heat in a motor, and the motor you have can likely be run with 48V. That would give you slightly more power wi...
by spinningmagnets
Apr 10 2021 10:24pm
Forum: EBike General Discussion
Topic: Tempted to lick my 50 volt battery
Replies: 44
Views: 708

Re: Tempted to lick my 50 volt battery

Please, PLEASE...DO NOT touch an ebike battery to your tongue. You will not die, but its a safe bet the emergency room will cut off the outer half of your tongue because it will have been horribly burned. You will be in excruciating pain. If this kind of thing fascinates you, cook a chicken breast w...
by spinningmagnets
Apr 10 2021 2:06pm
Forum: EBike General Discussion
Topic: Tempted to lick my 50 volt battery
Replies: 44
Views: 708

Re: Tempted to lick my 50 volt battery

You would get a horrifyingly painful burn on your tongue. People can get away with touching their tongue onto a 9V battery because the amps are so low.

A better experiment would be to touch your battery to a raw chicken breast.
by spinningmagnets
Apr 10 2021 7:32am
Forum: EBike General Discussion
Topic: Belt + 3-speed IGH + Seattle Hills = TSDZ2, BBS02, BBSHD, or mistake?
Replies: 3
Views: 216

Re: Belt + 3-speed IGH + Seattle Hills = TSDZ2, BBS02, BBSHD, or mistake?

I don't know if it's a good idea or a bad one. For hill climbing, put on the smallest chainring that will fit on your selected drive unit. The fact you want to convert a belt drive complicates things. The TDSZ2 will climb very steep hills, but because it has less power than the other two you mention...
by spinningmagnets
Apr 09 2021 9:00pm
Forum: Large EV General Discussion
Topic: Nobe 3-wheel EV car
Replies: 11
Views: 202

Nobe 3-wheel EV car

https://mynobe.com/ The founder is from Estonia, which gained independence from Russia in 1991. Its an AWD vehicle using 3 hubmotors. It has a charger that takes 120V AC, and the suitcase sized battery is removable so it can be charged indoors, for those owners who dont have a garage. They claim 17...
by spinningmagnets
Apr 09 2021 11:32am
Forum: Motor Technology
Topic: How much silicone sealing harm heat transfer?
Replies: 4
Views: 126

Re: How much silicone sealing harm heat transfer?

I assume you are talking about using tubeless tires on a hubmotor. If yes, the edge sealant will not hurt heat in the motor.
by spinningmagnets
Apr 09 2021 9:46am
Forum: Battery Technology
Topic: Isolation between cells needed?
Replies: 4
Views: 269

Re: Isolation between cells needed?

The cells in the center of the pack will run hotter than the cells at the edge, which can passively shed "some" heat. This means the cells that are not on the edge will degrade sooner, and the pack will have reduced capacity when those cell degrade. As a general rule, I am not a fan of hot...
by spinningmagnets
Apr 08 2021 3:46pm
Forum: EBike Non-hub Motor Drives
Topic: Chain jamming between bbshd and Lekke chainring
Replies: 5
Views: 137

Re: Chain jamming between bbshd and Lekke chainring

You need a chain guide. Mountain bikers take big jumps and the chain bounces a lot. There are many choices and models available....
by spinningmagnets
Apr 08 2021 2:59pm
Forum: Motor Technology
Topic: Stator/magnet swept area
Replies: 8
Views: 250

Re: Stator/magnet swept area

If you confine yourself to radial-flux in-runners, like the popular Leaf 35mm, MXUS 45mm, and QS 50mm wide stator examples, I agree that swept face area is a good indicator of power potential, if all other factors are the same. (These three examples use the same 205mm diameter lamination stacks) The...
by spinningmagnets
Apr 08 2021 2:52pm
Forum: Motor Technology
Topic: Stator/magnet swept area
Replies: 8
Views: 250

Re: Stator/magnet swept area

The entire swept face of the rotor and stator of an axial-flux can be working magnets plus electro-magnet material, but the motor mass near the center has trouble shedding heat. If width isn't a problem, you can stack more stators and rotors on the same shaft. Zero motorcycles started out with Moten...
by spinningmagnets
Apr 08 2021 10:07am
Forum: Battery Technology
Topic: Battery charging basics
Replies: 14
Views: 463

Re: Battery charging basics

For a few years, one manufacturer called 14S lithium-Ion battery packs 50V. After the Bafang mid drives began growing in popularity, they were often used with 14S, and many began labeling the packs 52V. EGO-brand lawn tools call 14S 56V, and I think Echo calls them 58V. So which is it, and what char...
by spinningmagnets
Apr 08 2021 8:26am
Forum: Motor Technology
Topic: The HI-Lebowski: a Lebowski SMD brain running a zombified Honda IMA Inverter: *a HOW-TO guide*
Replies: 49
Views: 5639

Re: The HI-Lebowski: a Lebowski SMD brain running a zombified Honda IMA Inverter: *a HOW-TO guide*

I don't know why I havent seen this before. Brilliant work. It appears the Honda hybrid IMA controller is probably the perfect size for a street motorcycle E-conversion. I've been looking at conversions a lot recently, and the most common complaint is controllers. There's absolutely nothing availabl...
by spinningmagnets
Apr 08 2021 7:04am
Forum: EScooters/EMotorcycles
Topic: Observed trials bike designing
Replies: 113
Views: 9442

Re: Observed trials bike designing

Do you have any pics of the 2-speed gearbox internals?
by spinningmagnets
Apr 07 2021 9:13pm
Forum: Motor Technology
Topic: Axial Flux Reluctance motor, pondering DIY layout
Replies: 7
Views: 198

Re: Axial Flux Reluctance motor, pondering DIY layout

I don't recall where I first found that pic, or the company name... Found a paper (2016, I hadn't seen this before) with some info. Has a graphic of axial switched reluctance. https://www.intechopen.com/books/switched-reluctance-motor-concept-control-and-applications/switched-reluctance-motor-topolo...
by spinningmagnets
Apr 07 2021 7:29pm
Forum: Motor Technology
Topic: Axial Flux Reluctance motor, pondering DIY layout
Replies: 7
Views: 198

Re: Axial Flux Reluctance motor, pondering DIY layout

Thanks. Switched reluctance, four electromagnetic coils and four shared poles with no coils in them. Ten salinent poles on the rotor. This is a working model, and apparently well-regarded. Considered to be two-phase with two electromagnet pairs. https://www.electricbike.com/wp-content/uploads/2019/0...
by spinningmagnets
Apr 07 2021 1:49pm
Forum: EBike Troubleshooting
Topic: Hello all, I'm new to forum and ebikes. Excuse my lack of Tech knowledge. Anyhow I got a new conversion on a
Replies: 8
Views: 213

Re: Hello all, I'm new to forum and ebikes. Excuse my lack of Tech knowledge. Anyhow I got a new conversion on a

A smaller chainring would help, it reduces stress on the battery. If the fastest you ever go when passing someone is 28 MPH, then theres no need to be able to run 35-MPH. Maybe try a 36T chainring, or something close?

It wouldn't be a big improvement, but it couldn't hurt.
by spinningmagnets
Apr 07 2021 10:24am
Forum: Help wanted & offered
Topic: Wanted battery repair Maryland
Replies: 3
Views: 137

Re: Wanted battery repair Maryland

You really need to get a $15 sparkfun digital multi meter/DMM and test each cell, and also where the break in current is. Perhaps the pack is fine and the BMS died. There are unscrupulous battery mechanics that will say its shot, charge you $40 for the diagnostic, quote you a huge fee if you want it...
by spinningmagnets
Apr 07 2021 10:05am
Forum: Motor Technology
Topic: Axial Flux Reluctance motor, pondering DIY layout
Replies: 7
Views: 198

Axial Flux Reluctance motor, pondering DIY layout

For anyone who is fairly new to ES, I am convinced that the Lebowski axial-flux motor is the ideal DIY electric motor for a non-hub electric bike. The most exotic thing is that it uses round disc neodymium magnets, which are reasonably available and not horribly expensive (for now, at least). Nothin...
by spinningmagnets
Apr 06 2021 3:44pm
Forum: Alternative Energy
Topic: Will this work in an emergency power outage?
Replies: 4
Views: 120

Re: Will this work in an emergency power outage?

Here's my take on power backups. A decade ago, many people were arguing that buying solar panels, an inverter, and a big battery had a poor Return On Investment /ROI. it might save you $50/month, but the system costs $5000, so it would take 100 months to "break even". (8 years?) For me, it...
by spinningmagnets
Apr 06 2021 7:39am
Forum: Motor Technology
Topic: new motor to tinker with...
Replies: 6
Views: 179

Re: new motor to tinker with...

A section of metal can be formed that has two magnets of opposite orientation embedded at either end of it, and I suspect that is what's happening here. Three segments with three pole-pairs / six magnets.
by spinningmagnets
Apr 06 2021 7:35am
Forum: Alternative Energy
Topic: Will this work in an emergency power outage?
Replies: 4
Views: 120

Re: Will this work in an emergency power outage?

I do believe it's possible. I have purchased two inverters as a backup for my retirement, but I havent tried to hook them up yet. They are both a nominal 48V DC to 120V AC, and the specs say they can take an input up to 60V, so my 14S "52V" ebike packs are 58V when fully charged, and shoul...
by spinningmagnets
Apr 05 2021 12:06pm
Forum: General Discussion
Topic: Cheap T-shirt print methods
Replies: 6
Views: 1770

Re: Cheap T-shirt print methods

Just found this: "Remember to neutralize the shirt with 1 part hydrogen peroxide to 10 parts water and soak for 15 minutes so the bleach does not continue to eat away at the fabric over time!! Edit: thanks so much for the awards and upvotes!!! It is indeed just the regular 3% peroxide solution ...