Search found 13978 matches

by liveforphysics
Apr 24, 2018 3:24 am
Forum: E-Bike General Discussion
Topic: Best 24v solution? Or is 36v the bare minimum?
Replies: 1
Views: 14

Re: Best 24v solution? Or is 36v the bare minimum?

Voltage as a number doesn't mean much on an ebike.

The best you can do is pick a value that works well with the controller, as the motor could care less, especially at the 250w range.
by liveforphysics
Apr 24, 2018 3:21 am
Forum: Electric Watercraft
Topic: Cracker Box for my daughter
Replies: 8
Views: 849

Re: Cracker Box for my daughter

Impressive work! Should be a really nice lake/river boat.
by liveforphysics
Apr 23, 2018 9:40 pm
Forum: E-Scooter and Motorcycle Photos & Videos
Topic: Andre´s GSXR 1000 K2 with QS Motor 273 80H, 34kW
Replies: 169
Views: 16508

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

Nice runs!! So glad it's making torque now at real phase currents. Your rear tire is only spinning because it's way over pressure. Your Kv being high is how to do it right and have epic pull all the way down the track if you can just feed it the phase current it needs to make the torque. To function...
by liveforphysics
Apr 23, 2018 8:46 pm
Forum: E-Bike Photos & Video
Topic: Spare parts E-BMX Build "Deathbike Junior"
Replies: 8
Views: 389

Re: Spare parts E-BMX Build "Deathbike Junior"

Nice brazed joints and nice work on a cool project!
by liveforphysics
Apr 23, 2018 7:14 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 981
Views: 49768

Re: Sur-Ron - New Mid drive Bike

If you're coming from bicycles you will think it's stable and not twitchy, if coming from motorcycles it will feel extremely light and agile.
by liveforphysics
Apr 23, 2018 7:07 am
Forum: Battery Technology
Topic: Tesla Model 3 battery teardown!
Replies: 20
Views: 380

Re: Tesla Model 3 battery teardown!

@Pajda - just my thoughts and observations. I know that earlier reports suggested a radial cooling approach where the cells were glued to the micro channel extrusions, but they aren't obvious from this video. Also, it's hard to see where the coolant enters and exits the battery pack other than the ...
by liveforphysics
Apr 23, 2018 6:27 am
Forum: Battery Technology
Topic: Tesla Model 3 battery teardown!
Replies: 20
Views: 380

Re: Tesla Model 3 battery teardown!

So glad to see potting and single ended interconnects in a Tesla.

Massive step ahead of Model S pack in packaging density and ruggedness.

I also wouldn't judge the performance of the heat path without understanding it's cooling system.
by liveforphysics
Apr 19, 2018 5:08 pm
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 1855
Views: 50002

Re: Wind and Solar vs Coal, Gasoline, Nuclear

The percentage values dont change that if you find yourself in a gas tight sealed room, you die if you dig up things and burn them, and the precise amount that induces death is just trivia. Likewise, nuclear is just digging up an burning an absurdly costly fuel with terrible emmisions eventually (at...
by liveforphysics
Apr 18, 2018 6:54 pm
Forum: Motor Technology
Topic: Emsiso emDrive 500 (100kW Peak, 800A/125VDC)
Replies: 35
Views: 2051

Re: Emsiso emDrive 500 (100kW Peak, 800A/125VDC)

Woot!!

Its going to accelerate so much harder now with the full 800amps!
by liveforphysics
Apr 18, 2018 5:47 am
Forum: Large EV General Discussion
Topic: XING Mobility Miss R - Electric Supercar Concept
Replies: 6
Views: 132

Re: XING Mobility Miss R - Electric Supercar Concept

Novec is pretty phenomenal in all aspect$$$, including its ability to weep right through most common fluid sealing interfaces. Quite the fluid to contain long term in complex systems, but possible to do. "an immersive-cooled battery pack"... 8) See that enormous radiator at the front? If they are im...
by liveforphysics
Apr 18, 2018 1:08 am
Forum: Battery Technology
Topic: Supercapacitors vs batteries. Capacity.
Replies: 126
Views: 3266

Re: Supercapacitors vs batteries. Capacity.

Not questioning its LTO, but thst doesn't mean its a bad product or isn't a good part for the application. I haven't safety tested many varieties of supercap, but what I have tested made LTO cell safety tests look like kittens in comparison. Its not a bad thing at all to be using LTO for bulk energy...
by liveforphysics
Apr 16, 2018 10:41 pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 325
Views: 17970

Re: Tesla Model 3

The universe has been so kind to share abundance with me through working hard with my consulting business that my interest now is creating a path forward for our shared spaceships life support system as a priority of infinite importance beyond any human constructed metrics (like what patterns of 010...
by liveforphysics
Apr 16, 2018 5:36 pm
Forum: Motor Technology
Topic: Emsiso emDrive 500 (100kW Peak, 800A/125VDC)
Replies: 35
Views: 2051

Re: Emsiso emDrive 500 (100kW Peak, 800A/125VDC)

Rovii wrote:
Apr 16, 2018 9:10 am
He switched off by over current!
Controller gain to high?
Does it have something to do with the PI regulation of torque mode?

It is normal controller tuning experience to spend at least days if not weeks of adjusting PID tuning loops in controllers before you can achieve full power from them.
by liveforphysics
Apr 16, 2018 1:21 am
Forum: EV Business World
Topic: Tesla Model 3
Replies: 325
Views: 17970

Re: Tesla Model 3

I work and buy plenty and would way rather see every penny possible getting reinvested into scaling the mfg volume while demand is currently effectively unlimited. Pulling cash out now vs investing it into volume mfg would be an insane failure of long-term management. Who even cares about profits? P...
by liveforphysics
Apr 16, 2018 12:30 am
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 981
Views: 49768

Re: Sur-Ron - New Mid drive Bike

Thank you for the kind words guys. It was overall a nice ride and bike did well and held up fine despite my blowing my one important job as a rider to make sure I didn't pedal strike. Less injury than my last pedal strike on a fixed gear road bike wearing no gear (and last time riding one, though I ...
by liveforphysics
Apr 15, 2018 10:28 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 981
Views: 49768

Re: Sur-Ron - New Mid drive Bike

Maybe first broken bone riding sur-ron on video to date, one rib has the familiar clicking of creptis on bone ends if I move around or laugh or cough. I got exactly what I deserved for pedal striking rock, and transitioning to an alternative style of riding featuring dominantly ribcage, forearm, and...
by liveforphysics
Apr 15, 2018 5:41 am
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 981
Views: 49768

Re: Sur-Ron - New Mid drive Bike

That's a big jump!! Amazing you made it so well!
by liveforphysics
Apr 15, 2018 12:17 am
Forum: Motor Technology
Topic: Emsiso emDrive 500 (100kW Peak, 800A/125VDC)
Replies: 35
Views: 2051

Re: Emsiso emDrive 500 (100kW Peak, 800A/125VDC)

Why is it limited to 428amps on an 800amp controller?? Is it a pack power limitation? That bike and tire wants all the torque you can throw at it right away when you set the tire pressure right for the carcass to load and deform and running sliding at 15-20% slip ratio for as long as you have power ...
by liveforphysics
Apr 15, 2018 12:12 am
Forum: E-Vehicles General Discussion
Topic: Luke (liveforphysics) article on Gizmag
Replies: 42
Views: 3357

Re: Luke (liveforphysics) article on Gizmag

Technically, it was the ES member Farfle cutting me, who happens to be an impressively well trained and experienced trauma medic and vet-medic, and I was perfectly comfortable and at ease enjoying the unique sensations of the install process. The day after install, an un-planned bicycle bunny-hoppin...
by liveforphysics
Apr 14, 2018 11:36 pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 325
Views: 17970

Re: Tesla Model 3

Who even cares about profits?

In California at least, it seems like 10% of the cars I see on the road are Model S or Model X. This is what matters, the rest is bean-counter bullshit.
by liveforphysics
Apr 14, 2018 11:32 pm
Forum: E-Bike General Discussion
Topic: The end of BionX?
Replies: 116
Views: 8765

Re: The end of BionX?

Kudos to that man! Having that info makes it cake to DIY packs, it's so fortunate so many nice motors/drives won't be scrap.
by liveforphysics
Apr 14, 2018 11:29 pm
Forum: E-Bike Photos & Video
Topic: My Sun Trip Bike, Back to Back Tandem Trike with Rowing Generator, Pedals, +Solar
Replies: 39
Views: 1177

Re: My Sun Trip Bike, Back to Back Tandem Trike with Rowing Generator, Pedals, +Solar

Sounds like an amazing adventure, Justin! Much respect for taking this on. For solar panels, I noticed sunpower sells their cells for individual projects which are pretty efficient. I've always wanted to do a project with them, but never had a chance. https://us.sunpower.com/buy-solar-cells/ Best o...
by liveforphysics
Apr 14, 2018 8:16 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 981
Views: 49768

Re: Sur-Ron - New Mid drive Bike

Nice!!! You are a legend motomoto!!!

Sometime I would love to ride with you just to try to learn from your skills.
by liveforphysics
Apr 14, 2018 7:46 pm
Forum: Motor Technology
Topic: Advanced DC K91-4003 max voltage
Replies: 5
Views: 104

Re: Advanced DC K91-4003 max voltage

I ran 232vdc and 1,000amps into my ADC 8" motor in my sparrow. It really hated 1,000amps and would randomly eject blasts of molten copper, but made good torque and kept running somehow. In really dry weather, it would handle it pretty well, and in humid conditions or if I ever got the motor wet from...