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by liveforphysics
Nov 19 2018 9:47pm
Forum: Motor Technology
Topic: Brushless motor efficiency
Replies: 11
Views: 267

Re: Brushless motor efficiency

Luke, if there is one thing I have learned from you it's that...if I have a big enough motor using enough amps, I won't be accelerating for long, I'll be up to cruise speed in a very short amount of time. Yep, you win burst power EV needs by finishing your brutal acceleration in a timely fashion pr...
by liveforphysics
Nov 19 2018 8:31pm
Forum: Motor Technology
Topic: Brushless motor efficiency
Replies: 11
Views: 267

Re: Brushless motor efficiency

This is running on my own controller so I scan write current limiting code also as a backup. I am hoping using a lookup table I will be able to get the throttle 'feel' how I want it. I can look at short bursts of even higher currents, but I am not sure if this will make more torque, or just warm th...
by liveforphysics
Nov 19 2018 5:02pm
Forum: Motor Technology
Topic: searching for legalisation documentation zero s 2014 driveline
Replies: 4
Views: 82

Re: searching for legalisation documentation zero s 2014 driveline

EMI is created by a complex relationship between vehicles chassis/frame, the wire routing, and the locations and mounting techniques. If you change how the wiring is ran and how the parts are mounted in the Zero, you will be greatly changing EMI performance. Fortunately for you, EMI only gets tested...
by liveforphysics
Nov 16 2018 2:05am
Forum: Motor Technology
Topic: Brushless motor efficiency
Replies: 11
Views: 267

Re: Brushless motor efficiency

It's core losses.

Many high performance motors overheat sitting on a bench no-load at full RPM, despite resistive copper heating from the windings. They may stay plenty cool in the application of spinning a propeller, or bursts of high power/rpm like an RC car.
by liveforphysics
Nov 14 2018 8:52am
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 2590
Views: 136449

Re: Sur-Ron - New Mid drive Bike

Congratulations my friend on getting real phase current! It awakes a beast in them with big phase current.
by liveforphysics
Nov 08 2018 1:03pm
Forum: Motor Technology
Topic: Ferrite as a stator material?
Replies: 9
Views: 889

Re: Ferrite as a stator material?

Brilliant post, thank you for sharing KD5ZXG! I've molded a few composite inductor cores of JBWeld (5% Ferrosilicon "steel" Filler). Can highly recommended for energy storage or flyback choke only, not for motor. Too much reluctance from too much distributed gap. Only conducts flux 3~6x better than ...
by liveforphysics
Nov 03 2018 6:29pm
Forum: E-vents
Topic: Taiwan cycle show, Asian Interbike. Walk through videos.
Replies: 5
Views: 237

Re: Taiwan cycle show, Asian Interbike. Walk through videos.

Thanks for the kind words. About to board a flight, i will see if i can edit together some footage from the show.
by liveforphysics
Nov 03 2018 5:03am
Forum: E-vents
Topic: Taiwan cycle show, Asian Interbike. Walk through videos.
Replies: 5
Views: 237

Taiwan cycle show, Asian Interbike. Walk through videos.

By luck I was in Taipei Taiwan on the last day of the Taiwan interbike-esque bike show and got to attend.

If you guys are interested I will upload the footage of walking through the show.
by liveforphysics
Nov 03 2018 3:27am
Forum: Items for Sale - New
Topic: Mobipus Controller Official
Replies: 26
Views: 1211

Re: Mobipus Controller Official

Thank you for making great products!
by liveforphysics
Nov 02 2018 12:20pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 2590
Views: 136449

Re: Sur-Ron - New Mid drive Bike

LFP, from what you have seen on this bike with your high power testing, would you consider the motor a good candidate for a non Sur-Ron conversion or is it just impressive for the stock hardware on that bike? Basically, if someone were doing a full size MX bike conversion at say 20-30kw would this ...
by liveforphysics
Nov 01 2018 10:49pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 2590
Views: 136449

Re: Sur-Ron - New Mid drive Bike

Not reading chart correctly. Any chance of elaborating? Sure, you don't have anything from that dyno plot to give you any indication of efficiency values. I realize that; I suppose I should have stated it is drawing at least 3.2KW over 12-14mph. I mentioned that I was guessing about the efficiency:...
by liveforphysics
Nov 01 2018 10:41pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Battery Sizing for Electric Motorcycle Races?
Replies: 1
Views: 168

Re: Battery Sizing for Electric Motorcycle Races?

I find 14kWh is pretty nice capacity in a race bike if the cells are capable of 5-10C rate discharge.
by liveforphysics
Nov 01 2018 8:42am
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 2590
Views: 136449

Re: Sur-Ron - New Mid drive Bike

3DTOPO wrote:
Nov 01 2018 5:07am
liveforphysics wrote:
Nov 01 2018 4:45am
Not reading chart correctly.
Any chance of elaborating?
Sure, you don't have anything from that dyno plot to give you any indication of efficiency values.
by liveforphysics
Nov 01 2018 4:45am
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike
Replies: 2590
Views: 136449

Re: Sur-Ron - New Mid drive Bike

Not reading chart correctly.
by liveforphysics
Nov 01 2018 4:06am
Forum: Electric Aircraft
Topic: Farfles Electric Ultralight.
Replies: 184
Views: 15509

Re: Farfles Electric Ultralight.

So excited for your DIY airplane flying so well my friend!! You are so amazing Jackson!!!
by liveforphysics
Oct 31 2018 3:56am
Forum: Electric Aircraft
Topic: Farfles Electric Ultralight.
Replies: 184
Views: 15509

Re: Farfles Electric Ultralight.

So proud of you brother!!!
:bolt: :mrgreen: 8) :D
by liveforphysics
Oct 14 2018 3:33pm
Forum: E-Bike General Discussion
Topic: Lines erased E-Bike / E-Scooter / E Motorcycle
Replies: 158
Views: 3199

Re: Lines erased E-Bike / E-Scooter / E Motorcycle

Everytime a car passes you, it's a dice roll on whether they are texting and only notice you from the BUMP BUMP as they go under the tires. If cars don't pass you, or pass you less, your number of car death dice rolls reduces drastically. No prizes awarded for getting slaughtered by cars by riding s...
by liveforphysics
Oct 12 2018 4:20am
Forum: E-Bike General Discussion
Topic: Lines erased E-Bike / E-Scooter / E Motorcycle
Replies: 158
Views: 3199

Re: Lines erased E-Bike / E-Scooter / E Motorcycle

Over 110mph some ebikes feel squirrely, some don't. The idea of the human constructed need to fit into someone's else's human constructed bounds is what fades away. My level of power to feel comfortable on an ebike in traffic is 5-15kW, more always offering the ability for improving safety. Around 5...
by liveforphysics
Oct 08 2018 9:02pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: Prototype EV for race
Replies: 31
Views: 2564

Re: Prototype EV for race

Congratulations buddy!!! Winning!
by liveforphysics
Oct 08 2018 3:21am
Forum: Motor Technology
Topic: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15
Replies: 528
Views: 63039

Re: Hi power inverter for Nissan leaf motor. Dyno's 302.3hp p15

Beautiful to see another monster come to life. :-)
by liveforphysics
Oct 03 2018 4:31pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 613
Views: 32759

Re: Tesla Model 3

Burning carcinogenic mutagens and spraying them in unburned form and the resulting millions of deaths will still seem like a fools bargain with no excuses even at 300mpg to the unconsenting people around you dosed with toxic vapors everytime your range extender starts with a cold catalyst surface. T...
by liveforphysics
Oct 03 2018 3:29pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 613
Views: 32759

Re: Tesla Model 3

Mastery of systems in the ICE vehicle to vehicle makers will be as useful as mastery of record player design or VCR design or CRT display design. You could be the best in the world at it and won't be worth a cup of coffee. Disagree. The people who "mastered" music player design (like record players...
by liveforphysics
Oct 03 2018 1:21pm
Forum: EV Business World
Topic: Tesla Model 3
Replies: 613
Views: 32759

Re: Tesla Model 3

Tesla can already make volume of EVs. Automakers that show signs of concern would be: Porsche, the mission E was supposed to go to mfg in 2016, then 2017, then 2018, then 2019, and now 2020. Ironically by 2020 the new Tesla Roadster makes it seem pathetic. VW has only made compliance cars using gas ...
by liveforphysics
Sep 30 2018 4:31pm
Forum: Battery Technology
Topic: DIY Super Capacitors, and Robert Murray-Smith
Replies: 14
Views: 1211

Re: DIY Super Capacitors, and Robert Murray-Smith

Everything he uses an aqueous not de-ionized electrolyte in is a scam, as it would self discharge and gas out in minutes to hours if it were "charged."