Search found 13882 matches

by liveforphysics
Feb 15, 2018 12:48 am
Forum: Large EV General Discussion
Topic: Lightweight AWD Sportscar
Replies: 21
Views: 677

Re: Lightweight AWD Sportscar

GOOD NEWS! Stator losses are only about 50W per motor at 30m/s! (At least per the simulation) I suspect it will be a bit higher since the laminations are joined together via a stamped tab, shorting the stack. There will also be stator, bearing, windage, drivetrain, and controller losses to take int...
by liveforphysics
Feb 14, 2018 6:13 pm
Forum: E-Bike Technical
Topic: Melting wires
Replies: 44
Views: 704

Re: Melting wires

So crimp and solder is worse then just my crimper ? I do not have a hydraulic crimper. Yes, your joints are more failure prone than if you just crimped them correctly alone. Solder is how to lose at joining wires. This is my favorite of the smaller wire cheap crimpers (it's a knock-off of a $500 Ni...
by liveforphysics
Feb 14, 2018 8:13 am
Forum: Alternative Energy
Topic: EV Investing?
Replies: 5
Views: 110

Re: EV Investing?

wecharg wrote:
Feb 13, 2018 2:14 pm
If you had $100,000 in cash today... How would you invest the $$

Just curious what people would do with the 100k
- New EV Dealerships
- EV Charge Stations
- Cryptocurrency
- Combo of each??

Appreciate any thoughts you may have.
Used P100DL
by liveforphysics
Feb 14, 2018 8:10 am
Forum: E-Bike Technical
Topic: Melting wires
Replies: 44
Views: 704

Re: Melting wires

I don't know why people relay on crimps anyway. It is such a spotty connection style. Solder it! Even if it is crimped I solder it to make sure. :D Solder conducts like crap in your joints making hot spots that if stressed melt and flow places they can short out on things. Solder in the wire strand...
by liveforphysics
Feb 13, 2018 5:28 pm
Forum: E-Bike Technical
Topic: Hot-setting 6061 Frame
Replies: 17
Views: 255

Re: Hot-setting 6061 Frame

I would be very surprised if you could find a heat treater willing to take on your project due to the liability issues. If you do find a shop to do the work for you may find that the process distorts your part requiring cold straightening afterwards. If I was building a cycle capable of 100mph+ spe...
by liveforphysics
Feb 12, 2018 7:54 pm
Forum: E-Bike Technical
Topic: Hot-setting 6061 Frame
Replies: 17
Views: 255

Re: Hot-setting 6061 Frame

I would try to do it cold, because once it's been hot from welding or a torch, it will be T-0, T-1 temper and has something like 1/5th to 1/7th the initial strength of T-6 6061.
by liveforphysics
Feb 12, 2018 12:25 am
Forum: E-Vehicles General Discussion
Topic: Electra Mechanica Sparrow
Replies: 35
Views: 2650

Re: Electra Mechanica Sparrow

I would load them both into a metal recycling bailer to use the materials for something exciting. but the sparrow is my next favorite ride and way more fun than taking a car somewhere. I dunno about that, Mustang GT350 Shelby but tall dudes dont fit in them. https://www.ford.com/performance/gt350/ h...
by liveforphysics
Feb 10, 2018 6:20 am
Forum: Battery Technology
Topic: Samsung 30Q hard voltage drop under load?
Replies: 9
Views: 327

Re: Samsung 30Q hard voltage drop under load?

Cooling the cells will give you more voltage drop from slowed ionic motion rates inside the cell.

Maybe fake 30Qs, maybe stored at high SOC and high temp until impedance climbed, and that's pretty light busing likely causing at least a few tenths of a volt drop.
by liveforphysics
Feb 09, 2018 4:51 am
Forum: Items for Sale - Used
Topic: [EU] Zero FX 2015 7000€
Replies: 6
Views: 381

Re: [EU] Zero FX 2015 7000€

I own and ride a 2015 FX as my daily commuter when I'm in LA, and it's such a pleasure to rip lane splitting through LA traffic daily. Whoever buys it will be stoked to ride it!
by liveforphysics
Feb 08, 2018 5:33 am
Forum: E-Bike Non-hub Motor Drives
Topic: Intellectual controller
Replies: 10
Views: 654

Re: Intellectual controller

Brushed motor rubbish.
by liveforphysics
Feb 07, 2018 4:23 am
Forum: Motor Technology
Topic: Multitooth motor winding idea
Replies: 27
Views: 572

Re: Multitooth motor winding idea

If you wanted to improve motor torque per unit of motor weight, you would do the opposite and double the number of teeth and double the number of magnets. Then that also doubles the amount of switching fields back and forth and doesn't that increase iron losses? I understood that less stator teeth ...
by liveforphysics
Feb 06, 2018 3:19 am
Forum: Motor Technology
Topic: Multitooth motor winding idea
Replies: 27
Views: 572

Re: Multitooth motor winding idea

If you wanted to improve motor torque per unit of motor weight, you would do the opposite and double the number of teeth and double the number of magnets. Then that also doubles the amount of switching fields back and forth and doesn't that increase iron losses? I understood that less stator teeth ...
by liveforphysics
Feb 05, 2018 2:46 pm
Forum: Motor Technology
Topic: Multitooth motor winding idea
Replies: 27
Views: 572

Re: Multitooth motor winding idea

If you wanted to improve motor torque per unit of motor weight, you would do the opposite and double the number of teeth and double the number of magnets.
by liveforphysics
Feb 04, 2018 7:38 am
Forum: Battery Technology
Topic: 1000Ah Huge capacity 100V+ BMS?
Replies: 14
Views: 317

Re: 1000Ah Huge capacity 100V+ BMS?

If you have good cells, you will need less than 10-50mA balance currents to manage 1,000Ah. If you have bad cells, no amount of balance current can fix them from making gasses and failing.
by liveforphysics
Feb 02, 2018 4:19 am
Forum: E-Bike Non-hub Motor Drives
Topic: Intellectual controller
Replies: 10
Views: 654

Re: Intellectual controller

Might be FOC or something cool. Might be marketing.
by liveforphysics
Jan 31, 2018 10:25 pm
Forum: E-Vehicles General Discussion
Topic: Looks like Sondors is at it again...(E-car)
Replies: 46
Views: 3122

Re: Looks like Sondors is at it again...(E-car)

Toorbough ULL-Zeveigh wrote:
Jan 31, 2018 12:24 pm
liveforphysics wrote:
Jan 31, 2018 1:08 am
so it's likely this tadpole...
:arrow: goorooh :pancake:
If you drove my sparrow, you would have a new respect for tadpoles. Personally I prefer a motorcycle for lane splitting reasons, but tadpoles are my second favorite vehicle topology. :-)
by liveforphysics
Jan 31, 2018 1:08 am
Forum: E-Vehicles General Discussion
Topic: Looks like Sondors is at it again...(E-car)
Replies: 46
Views: 3122

Re: Looks like Sondors is at it again...(E-car)

I talked to Sondors for a few minutes at an ebike event and he seemed pretty sharp and pretty driven to me. It's always easier to doubt than deliver, but I think he at least has a good shot at making it, because it's not like anything he's promising is impossible to deliver or outside possible cost ...
by liveforphysics
Jan 30, 2018 7:04 pm
Forum: E-Bike Technical
Topic: Powerfull Emoto + Rain = nasty crash
Replies: 15
Views: 450

Re: Powerfull Emoto + Rain = nasty crash

The painted white lines in the road are more slippery than the asphalt when wet. I've often experienced the tire spin up going over them on bikes that had no throttle malfunction. Ebikes spin up the wheel really fast compared to ICE bikes of similar power levels. That said, it's also possible water ...
by liveforphysics
Jan 28, 2018 9:59 pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Andre´s GSXR 1000 K2 with QS Motor 273 80H, 34kW
Replies: 145
Views: 12697

Re: Andre´s GSXR 1000 K2 with QS Motor 273 80H, 34kW

Hey Luke, thanks for this information but for this year I have finished my plans regarding battery box and battery types. But for autumn I will take your information into consideration. There are only 2,2Ah packages with 4S. Maybe I have to reduce the max voltage than to 28S! Now I am playing with ...
by liveforphysics
Jan 26, 2018 4:00 am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Andre´s GSXR 1000 K2 with QS Motor 273 80H, 34kW
Replies: 145
Views: 12697

Re: Andre´s GSXR 1000 K2 with QS Motor 273 80H, 34kW

Well I am using Turnigy Heavy Duty 6S 5000mAh (60/120C). I tested on battery with over 200A for short. In my last setup I worked with 175V DC (fully charged) 20Ah. So I think to have enough power for the short run. You are right I only posted the numbers of Kelly´s data specification. Now I bought ...
by liveforphysics
Jan 21, 2018 7:09 pm
Forum: E-Bike General Discussion
Topic: Potential Catastrophic Frame Failer Averted ….sort of.
Replies: 101
Views: 2019

Re: Potential Catastrophic Frame Failer Averted ….sort of.

Can the casting tape be used to repair a chainstay crack (near the bottom bracket) in my friend's titanium frame?If it's as strong as indicated, should be a perfect fix. You could give it a shot. Get the surfaces sanded to be rough and cleaned with acetone, and if you can get the right amount of sn...
by liveforphysics
Jan 19, 2018 4:18 am
Forum: E-Bike General Discussion
Topic: Potential Catastrophic Frame Failer Averted ….sort of.
Replies: 101
Views: 2019

Re: Potential Catastrophic Frame Failer Averted ….sort of.

Cyclo cross had gained a lot in popularity here, since I quit about 10 years ago. It is a very tough disciplin. Courses are designed to push participants to their limits of strength and aerobics. I was too old to be competitive, but had a lot of fun trying. I was riding a Specialized Tri-Cross Expe...
by liveforphysics
Jan 19, 2018 4:14 am
Forum: E-Bike Non-hub Motor Drives
Topic: Design a Freewheel Crankset for Direct Mount Crankests
Replies: 27
Views: 1208

Re: Design a Freewheel Crankset for Direct Mount Crankests

So funny just after reading this, I saw this: https://www.bikemag.com/gear/components/drivetrain/sram-introduces-dub-crank-bottom-bracket-technology/ Going to 28.99mm from 30mm, because you know... lol I do not see Shimano changing , except for perhaps keeping the 24mm ID , Outer Bearing and just ma...