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by liveforphysics
Feb 25 2019 2:25pm
Forum: E-Bike General Discussion
Topic: MXUS 3k (clones) max copper fill
Replies: 5
Views: 247

Re: MXUS 3k (clones) max copper fill

- Rewinding is not really a thing, some have done it to RC motors and the bigger RC motors but I havent seen anyone here on Endless Sphere rewind any hub motor...... yet. I am sure someone will direct us to a link, the search wizardry at work :wink: As for the different diameter windings, not sure ...
by liveforphysics
Feb 25 2019 1:34pm
Forum: Motor Technology
Topic: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%
Replies: 25
Views: 1144

Re: HyMag tech boosts magnetic flux density of permanent magnets by 10-30%

Hey cool and thanks for sharing that. This is a refreshing break from all "new battery" breakthroughs we're used to hearing about. There are several other aspects of the EV drivetrain that are all deserving of improvements and it's good to see permanent magnets getting some R&D love too! NP! what i...
by liveforphysics
Feb 25 2019 1:01pm
Forum: Motor Technology
Topic: BESC - beefed up VESC motor controller for high power ebikes
Replies: 30
Views: 1840

Re: BESC - beefed up VESC motor controller for high power ebikes

This project is epic!!! Thank you so much for your work!!!

Going to half film caps and isolated gate drivers was how to win at growing the power!
by liveforphysics
Feb 19 2019 3:15am
Forum: E-Vehicles General Discussion
Topic: ICE vs Electric Motor Transmissions
Replies: 52
Views: 1370

Re: ICE vs Electric Motor Transmissions

A transmission just takes power your motor made and rubs a share of it away like a tax. I think formula E is a perfect example, they forced them to have 5spd gearboxes initially. As soon as permitted, teams dropped to 4spd, then 3spd at next race, then 2spd, and cars keep getting faster. Half the te...
by liveforphysics
Feb 18 2019 9:13pm
Forum: E-Vehicles General Discussion
Topic: ICE vs Electric Motor Transmissions
Replies: 52
Views: 1370

Re: ICE vs Electric Motor Transmissions

Anytime you add the same mass of transmission into the motor/controller, you will be winning the performance gains. The biggest appeal of EV's in racing is no transmission. Interruptions in torque delivery are not acceptable. Multi-speed transmissions are a relic crutch of things with pathetic ICE p...
by liveforphysics
Feb 18 2019 3:35pm
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 411
Views: 33082

Re: Nucular electronics - complete kit for ev! [beta]

Hi, in the Russian forum told me that the PAS can be connected to the controller. My question: For the PAS to be limited to 25km/ h and 500W peak, and simultaneously the trhottle to 100% 1500W without limit speed, I think the controller should lower the V. (and W.?), don't I? some controllers to de...
by liveforphysics
Feb 12 2019 6:47pm
Forum: E-Bike Technical
Topic: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers
Replies: 155
Views: 10160

Re: 2018 Torque Arm Tests, Splined Interface Design and Tabbed Washers

I'm going to guess the aluminum rear triangle fatigues at the HAZ next to a weld and grows a crack until it can deform enough to trip the limit switches.

Looks like a huge improvement in torque arms!
by liveforphysics
Feb 12 2019 6:29pm
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 411
Views: 33082

Re: Nucular electronics - complete kit for ev! [beta]

Small news while waiting for new batch. Assembled another 24F prototype inside of SurRon controller casing: https://i.imgur.com/oZoY8OYl.jpg And of course: https://i.imgur.com/iDJt5mul.jpg So i have two 24F to run on test bench for full power, but oops: https://i.imgur.com/ZxanvfAm.jpg Something ha...
by liveforphysics
Feb 11 2019 8:13pm
Forum: Battery Technology
Topic: Tesla acquires maxwell - why Luke?
Replies: 24
Views: 1093

Re: Tesla acquires maxwell - why Luke?

It is simple.....Tesla wants to be able to dump huge amps during accelatation surges <SNIP> Really unlikely. They already have a car that can do a 0-60 in 2.5 seconds. What they need is cheaper batteries and higher energy density. Power density in modern lithium packs is not lacking at all. They've...
by liveforphysics
Feb 11 2019 7:39am
Forum: Battery Technology
Topic: Tesla acquires maxwell - why Luke?
Replies: 24
Views: 1093

Re: Tesla acquires maxwell - why Luke?

I don't think you will be seeing any ultracapacitors added to Tesla EVs, but rather something like an electrode mfg process that eliminates solvents and hence reduces cost and expanding available materials selection perhaps, but this is just speculation from seeing the public patents.
by liveforphysics
Feb 06 2019 5:56pm
Forum: E-Bike Technical
Topic: DIY 10awg phase leads through axle in 9C hubmotor.
Replies: 102
Views: 18402

Re: DIY 10awg phase leads through axle in 9C hubmotor.

hey there is there any way i could see the images even aftr this long :lol: Sorry buddy, I did that like 5-10 years ago, imageshack that used to hose the photos was discontinued, I didn't save the photos anywhere else. We just used some cheap olifin based shrink, but I'm not a shrink expert to tell...
by liveforphysics
Jan 29 2019 11:00pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 3232
Views: 206935

Re: Sur-Ron - New Mid drive Bike

Merlin wrote:
Jan 29 2019 11:34am
Backflip on dirt :D

https://www.instagram.com/p/Bnu276nHTvn/
So awesome! More videos of this guy riding it!
by liveforphysics
Jan 27 2019 6:48pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Zero SR
Replies: 17
Views: 735

Re: Zero SR

Most folks that get an SR are still enjoying trouble free riding. I would recommend a DSR if evasion is a key buying metric, the bikes that can run you down on the freeway well tend to not have much to offer in chasing off-road.
by liveforphysics
Jan 25 2019 12:54pm
Forum: Battery Technology
Topic: The "thermal management of LiPo" thread!
Replies: 102
Views: 8119

Re: The "thermal management of LiPo" thread!

Similarly, immersion cooling on pouches has the same thermal problem of clamping the pouch between cold-plates. This is because the decay mechanic is related to non-uniform temperatures between layers. If you cool the tabs or the edges of the pouch only, the Rth path stays uniform between layers, a...
by liveforphysics
Jan 22 2019 6:12am
Forum: Battery Technology
Topic: Toyota and Panasonic form huge battery R&D & production partnership
Replies: 12
Views: 505

Re: Toyota and Panasonic form huge battery R&D & production partnership

Table salt on a conventional 18650 guts won't do it, but if you pair the right materials, its no physics problem to go way beyond 8Ah, perhaps 80Ah in an 18650, just a materials stability and compatibility problem. I bet when we get upto the $20billion mark in R&D we'll find some breakthrough SS bat...
by liveforphysics
Jan 22 2019 4:38am
Forum: Battery Technology
Topic: Toyota and Panasonic form huge battery R&D & production partnership
Replies: 12
Views: 505

Re: Toyota and Panasonic form huge battery R&D & production partnership

bearing wrote:
Jan 21 2019 11:36am
I think this sounds like a high up corporate decision, and not something sparked from an innovation in a lab.

Lots of manpower and hours will definitely lead to refinement of known technology. But not necessarily lead to innovation.
+1
Bingo.
by liveforphysics
Jan 20 2019 7:20pm
Forum: Battery Technology
Topic: Toyota and Panasonic form huge battery R&D & production partnership
Replies: 12
Views: 505

Re: Toyota and Panasonic form huge battery R&D & production partnership

I bet when we get upto the $20billion mark in R&D we'll find some breakthrough SS battery... its just a matter of time/people/money.... I used to think that was true, but you actually just need someone who figures out a solution that meets the cost/mfg/performance/safety needs no matter where it co...
by liveforphysics
Jan 20 2019 7:02pm
Forum: Large EV General Discussion
Topic: Lightweight AWD Sportscar
Replies: 47
Views: 4357

Re: Lightweight AWD Sportscar

I'm excited for your project. I think you had the right idea the first time with lower voltage. Chademo stations you find in the wild are only 50kW charging, I have 28kW of chargers fitted to my DSR motorcycle (over half a typical DC-fast charge station's power). I tap 4 * J1772 plugs, or 2 Tesla pl...
by liveforphysics
Jan 20 2019 5:34am
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Suzuki GSX-R e899 K2
Replies: 327
Views: 33961

Re: Suzuki GSX-R e899 K2

As far as I know you own the top speed of any hubmotored 2 wheeler. The highest I ever recorded with my daily rider was 172kph, and it had a bit more since it was still accelerating when I let off the throttle. Plus it wasn't at full charge. My newer ebike is running the same motor with a 6% larger...
by liveforphysics
Jan 19 2019 4:59pm
Forum: E-Bike Non-hub Motor Drives
Topic: Modded Sur ron Question
Replies: 8
Views: 416

Re: Modded Sur ron Question

Like I mentioned above, continuous road racing overheats it. It still lasted a couple laps of Laguna Seca hanging with much bigger bikes before that motor melted.
by liveforphysics
Jan 18 2019 7:29pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 3232
Views: 206935

Re: Sur-Ron - New Mid drive Bike

I'm confused, the talk not too long ago was how a belt drive couldn't take the torque or the belt would not handle the power. Now everyone is assuming it will work by slapping on a belt and sprocket? Its no big deal to make a sprocket and install a belt. Why is everyone assuming this will work? I'v...
by liveforphysics
Jan 18 2019 7:18pm
Forum: Battery Technology
Topic: The "thermal management of LiPo" thread!
Replies: 102
Views: 8119

Re: The "thermal management of LiPo" thread!

Stuff looks amazing, but there's $17,000 worth of graphite for a $24,000 battery. I reckon aluminium might be a winner hey... Too bad it's so expensive. The article on tab cooling was interesting. Seems more heat is generated on the tab end because the current density is higher. If the tabs were co...
by liveforphysics
Jan 18 2019 6:03pm
Forum: E-Bike Non-hub Motor Drives
Topic: Modded Sur ron Question
Replies: 8
Views: 416

Re: Modded Sur ron Question

Stock phase leads aren't melting at an power level Ive seen. Dirtbikes with extreme power to weight ratios rarely get a high duty cycle %, and this is what enables the system to live. If you're going to road race it, you can have a high enough duty cycle % to overtemp/cook the motor. Motor cooling e...