Search found 10248 matches

by spinningmagnets
Jan 29 2019 9:52pm
Forum: Motor Technology
Topic: "Edge" DD hubmotor, 1500W, 35mm, Al core
Replies: 151
Views: 18523

Re: "Edge" DD hubmotor, 1500W, 35mm, Al core

If you overheated it and are doing 50-MPH, you need a smaller rear tire diameter. I'd recommend an 18-inch moped rim and tire. That would provide a cooler-running motor and slower top speed (without changing anything else). Add a temp sensor and keep the heat at the hottest part in the motor below 2...
by spinningmagnets
Jan 28 2019 8:17pm
Forum: General Discussion
Topic: Have you been in the presence of a famous person?
Replies: 20
Views: 694

Re: Have you been in the presence of a famous person?

I shook Vincent Prices' hand at a grocery store in Santa Monica. I met Jane Russel many times, as I am related to her live-in housekeeper from 2006-11. Both were very nice... I am impressed by Adam Savage, but someone else who is simply famous (Kardashians, DJ Khaled, Miley Cyrus, etc) does not inte...
by spinningmagnets
Jan 28 2019 7:24pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 588
Views: 70906

Re: kWeld - "Next level" DIY battery spot welder

Here is another video showing successful results. Keith from 18650 shrink sells 0.15mm thickness pure nickel. It welded very well at 20J (seen at the 7:00 mark), and the glass-covered fuses did well at 5J...

https://www.youtube.com/watch?v=Rmsp63iprnc

by spinningmagnets
Jan 27 2019 9:54am
Forum: Battery Technology
Topic: Which battery chemistry for extreme climates?
Replies: 37
Views: 1232

Re: Which battery chemistry for extreme climates?

It shouldn't be difficult to set up a semiconductor relay. Get in the cold car that has been sitting for a week or two, flip the switch that connects the small Lithium pack to the supercapacitors, wait a couple minutes for the battery to charge the super-caps, then start the car. Aside from poor col...
by spinningmagnets
Jan 27 2019 1:49am
Forum: Battery Technology
Topic: Which battery chemistry for extreme climates?
Replies: 37
Views: 1232

Re: Which battery chemistry for extreme climates?

I've been wondering about this too. The super capacitors should be able to handle the extreme cold, but I am wondering about a battery to charge the caps. If you start the car at least once a week, I'm fairly sure you wouldn't need a backup battery, but even if you do, the lithium battery wouldn't n...
by spinningmagnets
Jan 24 2019 11:24pm
Forum: Battery Technology
Topic: I designed a simple 3D-printed solderless battery pack.
Replies: 9
Views: 562

Re: I designed a simple 3D-printed solderless battery pack.

I like the "hex/Philips" cap (perhaps add a straight coin slot into the Philips), but...it should be very easy to provide several options for whatever various builders might want to print for themselves.
by spinningmagnets
Jan 24 2019 7:50pm
Forum: Battery Technology
Topic: Which battery chemistry for extreme climates?
Replies: 37
Views: 1232

Re: Which battery chemistry for extreme climates?

You need a 12V super-capacitor bank. It might bleed down over a month. And in that case, you might need a 6S LTO pack, or a 4S LiFePO4 pack to charge it up. That being said, I have seen a video of a super-cap bank on a car that had the lead-acid battery disconnected, along with the fuel relay. The S...
by spinningmagnets
Jan 24 2019 12:30pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Appel Electric Cruiser
Replies: 98
Views: 7973

Re: Appel Electric Cruiser

Akso research "linear actuator". Think of it as a hydraulic ram, but actuated by electromagnets...much like a linear motor. A solenoid is an electrical "ON / OFF" actuator, but a linear actuator is more like a stepper motor that is stretched out in a straight line. It can be moves in discrete steps ...
by spinningmagnets
Jan 24 2019 2:04am
Forum: E-Bike Non-hub Motor Drives
Topic: Why has progress stalled?
Replies: 10
Views: 551

Re: Why has progress stalled?

Gasoline near my house is $1.87/gallon...
by spinningmagnets
Jan 24 2019 1:58am
Forum: E-vents
Topic: Lost Sierra Races 2019, July 5-7
Replies: 3
Views: 239

Re: Lost Sierra Races 2019, July 5-7

Bump, to move it up...

This event is located in central California...

https://www.electricbike.com/lost-sierr ... -festival/
by spinningmagnets
Jan 23 2019 7:31pm
Forum: E-vents
Topic: Sea Otter Classic 2019, April 11-14, Monterey California
Replies: 8
Views: 450

Re: Sea Otter Classic 2019, April 11-14, Monterrey California

I notice the 160-Nm Bafang Ultra Max is not on the "allowed" list...also the 120-Nm TQ drive...
by spinningmagnets
Jan 23 2019 7:23pm
Forum: General Discussion
Topic: Anyone into air guns/ air rifles ?
Replies: 5
Views: 381

Re: Anyone into air guns/ air rifles ?

I get raccoons and possums in my back yard. I am a live-and-let-live guy, but I do know that sometimes they carry serious diseases, and I may sometimes need to dispose of a violent visitor. I live just close enough to a town that it would cause me serious issues with the police if I used a gun, and ...
by spinningmagnets
Jan 22 2019 11:28pm
Forum: E-Bike General Discussion
Topic: Scratched the side of the windings, will it be OK?
Replies: 1
Views: 124

Re: Scratched the side of the windings, will it be OK?

They will be fine, you just don't want the bare parts from one scratched wire to short the current to the other wire (or the case). Brush on some high-temp motor sealant, maybe check doctor bass posts about ventilating hubmotors, they sprayed sealing over the entire insides to prevent rust, and he r...
by spinningmagnets
Jan 22 2019 11:19pm
Forum: E-vents
Topic: Sea Otter Classic 2019, April 11-14, Monterey California
Replies: 8
Views: 450

Sea Otter Classic 2019, April 11-14, Monterey California

This is a mountain bike festival, just an hours drive south of San Francisco, and near the ocean. Previously, I had not been too interested, but last year turned out to be surprisingly "ebike friendly", due to the major bike brands finally jumping on-board the electric bandwagon. The Reno Interbike ...
by spinningmagnets
Jan 20 2019 10:03am
Forum: Battery Technology
Topic: I designed a simple 3D-printed solderless battery pack.
Replies: 9
Views: 562

Re: I designed a simple 3D-printed solderless battery pack.

You're welcome. You are on the right track. There are similar designs floating around or already in production. Having several types to compare each aspect of their design is a good thing for all of us.
by spinningmagnets
Jan 20 2019 3:58am
Forum: Battery Technology
Topic: I designed a simple 3D-printed solderless battery pack.
Replies: 9
Views: 562

Re: I designed a simple 3D-printed solderless battery pack.

That might work fine at the negative end, but the entire bottom and sides are charged with the Negative. This means vibration can cause anything that is rubbing against the shoulder on the positive end can wear through and cause a short. You might add some additional protection to just barely cover ...
by spinningmagnets
Jan 20 2019 1:13am
Forum: Motor Technology
Topic: Ferrite as a stator material?
Replies: 17
Views: 1581

Re: Ferrite as a stator material?

Cedric Lynch could have used a motor style with very thin laminations, but I was under the impression that he was seeking very high efficiency in a specific size of motor package. His aero semi-recumbent E-motorcycle was his vision of a light and cheap single-rider vehicle to reduce the use of 4,000...
by spinningmagnets
Jan 19 2019 11:03pm
Forum: Motor Technology
Topic: All-In-One Motor
Replies: 10
Views: 475

Re: All-In-One Motor

There are plenty of motors that use a solid axle with the wires coming out the side of the motor. I can see where that would make modifying the insides of the motor space easier. I think what you described at one point was an outrunner. An inrunner and outrunner both have a rotor and [stationary] st...
by spinningmagnets
Jan 19 2019 10:38am
Forum: E-Bike Non-hub Motor Drives
Topic: Left side freewheel sprocket adaptor
Replies: 50
Views: 4476

Re: Left side freewheel sprocket adaptor

"...or 1 time 8074..." So far, I haven't built a better motor & controller set up than the 6-turn, 2-in hand, 14G, dlrk/wye terminated motor...run the thing with a 12 or 18-FET xie-chang with a 6-Kw limit on 20 LiPo cells & you will not find a better RC power combination [with external hall sensors]...
by spinningmagnets
Jan 18 2019 9:12pm
Forum: E-Bike General Discussion
Topic: My first massive controller with these connectors
Replies: 9
Views: 421

Re: My first massive controller with these connectors

Copper oxidizes easily (turns from bright red to dull brown) and that thin oxide film is less conductive. It's not a huge problem at higher voltages (indoor 120V AC), but on an outdoor 12V system like cars, corrosion is a constant struggle. The coating is likely to be tin or possibly zinc. If it was...
by spinningmagnets
Jan 17 2019 9:27pm
Forum: E-Bike Technical
Topic: Advice? ebike battery to variable DC/DC step-down converter
Replies: 3
Views: 205

Re: Advice? ebike battery to variable DC/DC step-down converter

Thanks for taking the time to find those, I appreciate your effort.

Unless somebody stops me, that Yeeco 5-Amp for $40 is looking pretty sweet.
by spinningmagnets
Jan 17 2019 9:20pm
Forum: Items for Sale - New
Topic: I did it - I launched my Bafang Ultra based ebike! Also selling Bafang Ultra spares !
Replies: 24
Views: 1077

Re: I did it - I launched my Bafang Ultra based ebike! Also selling Bafang Ultra spares !

Hey, the shell that the ultra bolts up to, is it aluminum or steel? Does Bafang have both, or only one?

Image
by spinningmagnets
Jan 17 2019 2:59pm
Forum: E-Bike Technical
Topic: Advice? ebike battery to variable DC/DC step-down converter
Replies: 3
Views: 205

Advice? ebike battery to variable DC/DC step-down converter

I already have a robust potted DC/DC that takes 36V-60V and converts that to 12V for ebike lights, radio, etc...(search ebay for "golf cart DC/DC"). I have wanted a variable input/output DC/DC converter for a while (for a variety of projects). The push right now for me is that the kCap uses 6V-8V DC...