Search found 45 matches

by neuraxon77
Sep 16 2011 5:54am
Forum: Forum Rules and Features
Topic: Planned Server Downtime, August 31st 19:30 PST
Replies: 50
Views: 18507

Re: Planned Server Downtime, August 31st 19:30 PST

Great work MRVass and everyone, coming back here only recently I wondered where the images had all gone, now I know. I see the forum has a favicon too, I was only thinking it would be nice to have one yesterday now that I've pinned ES as a Firefox Tab. :D Any chance of getting ATOM/RSS so I can feed...
by neuraxon77
Feb 13 2011 5:22pm
Forum: E-Vehicles General Discussion
Topic: Acceleration OK, deceleration???
Replies: 13
Views: 2145

Re: Acceleration OK, deceleration???

That radial pattern while good for lateral loads (cornering) is not good for torsional load (braking/accelerating). I'd have gone with a cross pattern and 48 spokes, especially with such large rotors and the 108kg you're stopping. If anyone is interested in actual brake performance data, then check ...
by neuraxon77
Jan 26 2011 4:55pm
Forum: E-Bike General Discussion
Topic: Voltage Cycles - Basman framed eBikes
Replies: 4
Views: 2600

Voltage Cycles - Basman framed eBikes

Came across these from Voltage Cycles . The Board Tracker was also at Interbike under the Pedego branding . Board Tracker http://www.voltagecycles.com/wp-content/uploads/2010/12/IMG_4060-300x225.jpg Classic Cruiser http://www.voltagecycles.com/wp-content/uploads/2010/12/IMG_4329-300x225.jpg Chopper ...
by neuraxon77
Jan 26 2011 3:02pm
Forum: E-Bike Technical
Topic: Sparkless Plugs (Connectors)
Replies: 1
Views: 381

Sparkless Plugs (Connectors)

IEEE Spectrum have an article about DC in the data center and I noticed the sparkless plugs which would be great for helping prevent Kentucky Fried Fingers as well as other accidents. Anyone know of any suitable for ebikes?
by neuraxon77
Jan 24 2011 5:31pm
Forum: Motor Technology
Topic: Low Kv Motor Dyno Data/Sheets/Charts?
Replies: 19
Views: 4671

Re: Low Kv Motor Dyno Data/Sheets/Charts?

Thanks guys, I think I have a much better understanding now. Take a look at the following small brushed PMDC motor speed-torque efficiency chart and please tell me if I'm reading it correctly. It's a little backwards. To begin with I was a little confused as to where it lists the motor torque, then ...
by neuraxon77
Jan 23 2011 10:14am
Forum: Motor Technology
Topic: Low Kv Motor Dyno Data/Sheets/Charts?
Replies: 19
Views: 4671

Re: Low Kv Motor Dyno Data/Sheets/Charts?

Hi Jeremy, Thanks for your knowledge here, lots of useful info there, however I think I should have been clearer. :oops: I'm a relative newbie at motor design and reading these charts, so please correct me if anything that follows is incorrect. What I'm really interested in is how low an RPM differe...
by neuraxon77
Jan 23 2011 4:47am
Forum: Motor Technology
Topic: Low Kv Motor Dyno Data/Sheets/Charts?
Replies: 19
Views: 4671

Re: Low Kv Motor Dyno Data/Sheets/Charts?

I found another I'm adding to the list. Golden Motor have data for a heavy 11 Kg BLDC for 3-7.5 KW that appears to be around 72-87 Kv. The efficiency shown on the performance curve doesn't match their performance sheet (the rpm indicates different motors). Nor does it show the low rpm torque charact...
by neuraxon77
Jan 23 2011 3:43am
Forum: Motor Technology
Topic: Low Kv Motor Dyno Data/Sheets/Charts?
Replies: 19
Views: 4671

Re: Low Kv Motor Dyno Data/Sheets/Charts?

To get the stator / rotor laser cut and bonded was around $1400.
Damn that's expensive for the prototype's laser cutting and bonding, as you say only really makes sense then to make them in numbers if you can find the demand. You never know who might find a use for it if you wanted to market it.
by neuraxon77
Jan 22 2011 2:03pm
Forum: General Discussion
Topic: Electrons take turns like pedestrians
Replies: 0
Views: 259

Electrons take turns like pedestrians

When electrons are put onto liquid helium, they skate like air-hockey pucks above the surface. In the past decade or so, researchers have learned to precisely control electrons above a thin layer of liquid helium that adheres by surface tension to tiny grooves on a solid wafer. Extending these tech...
by neuraxon77
Jan 22 2011 12:10pm
Forum: Motor Technology
Topic: Low Kv Motor Dyno Data/Sheets/Charts?
Replies: 19
Views: 4671

Re: Low Kv Motor Dyno Data/Sheets/Charts?

Thanks for the data Ryan.

Looks like a great project, keep us informed if you do the rewind! What are your plans for the motor?
by neuraxon77
Jan 22 2011 12:05pm
Forum: E-Vehicles General Discussion
Topic: Vehicle Autonomy - Platooning
Replies: 0
Views: 272

Vehicle Autonomy - Platooning

Anyone thought about autonomous ebiking? or etriking?

What would you use a small automonous bike/trike sized vehicle to do?



by neuraxon77
Jan 22 2011 10:42am
Forum: E-Bike Technical
Topic: The helpful 9C wire upgrade thread, explicit DIY pictures.
Replies: 67
Views: 11660

Re: The helpful 9C wire upgrade thread, explicit DIY picture

Nice tutorial. Especially like the shrink wrap needle. :arrow:

Which has more copper area now? The 10 AWG or the 8 x ?? AWG phase wire?
by neuraxon77
Jan 22 2011 10:22am
Forum: E-Bike Non-hub Motor Drives
Topic: Prop for low power drive?
Replies: 19
Views: 2375

Re: Prop for low power drive?

BTW, the lunar rovers had to use wheel drive, as there's no atmosphere on the moon, so a prop wouldn't have worked...........
Thanks Jeremy. I remembered I should have mentioned that after I wrote the damn post... :lol:

Hindsight! It's always behind you.
by neuraxon77
Jan 22 2011 10:06am
Forum: Motor Technology
Topic: New Magnets Could Solve Our Rare-Earth Problems
Replies: 9
Views: 1247

Re: New Magnets Could Solve Our Rare-Earth Problems

If you've ever held a bicycle wheel in your hands and spun it at speed, you'll have felt the resistance to change in direction. I've often wondered how the flywheel KERS affects the cars change in direction and handling. I'm sure they could use this to their benefit if they wanted to... :wink: After...
by neuraxon77
Jan 22 2011 9:52am
Forum: Battery Technology
Topic: The Low Down on Battery Types ...
Replies: 12
Views: 1135

Re: The Low Down on Battery Types ...

not much info exists on the nano-tech. I was wondering... do they puff/blow up/flame like regular lipo does under the same conditions?
See this thread for smoldering nano-techs.
by neuraxon77
Jan 22 2011 9:42am
Forum: E-Bike General Discussion
Topic: Rad Power 72 Volt Lithium E-Bike Trike Rally
Replies: 22
Views: 3188

Re: Rad Power 72 Volt Lithium E-Bike Trike Rally

The most overlooked benefit of these trikes is that girls can ride on your lap. The looks are priceless when I'm riding around town. :lol: I did think about the carrying capacity of trikes after watching a couple of videos, but I can't imagine better cargo to be carrying than that! So tempted to bu...
by neuraxon77
Jan 22 2011 4:29am
Forum: Motor Technology
Topic: New Magnets Could Solve Our Rare-Earth Problems
Replies: 9
Views: 1247

Re: New Magnets Could Solve Our Rare-Earth Problems

With China nationalizing 11 of their rare earth mines, this can't come soon enough.
by neuraxon77
Jan 22 2011 4:12am
Forum: E-Bike Non-hub Motor Drives
Topic: Prop for low power drive?
Replies: 19
Views: 2375

Re: Prop for low power drive?

I like seeing people with crazy ideas, but anything fan driven that could otherwise be mechanically driven will never take off. :lol: Cons: Noise pollution, poor efficiency, poor acceleration, poor safety. Fans have practical uses in the air or on marshland, but not when surface drive is an option. ...
by neuraxon77
Jan 22 2011 2:34am
Forum: E-Bike Non-hub Motor Drives
Topic: First build
Replies: 166
Views: 18198

Re: First build

Does anyone know if the Magura electric throttle pots are linear or logarithmic? If linear then changing to a logarithmic may help...

Image
by neuraxon77
Jan 19 2011 1:04pm
Forum: E-Bike Non-hub Motor Drives
Topic: Interesting Commercial Ebike (BB-motor-integration)
Replies: 8
Views: 1405

Re: Interesting Commercial Ebike (BB-motor-integration)

I wouldn't call this bottom bracket integration, instead I'd call this frame integration as it's still a 2-stage reduction, just with gearing and the motor in the frame.

Nice to see this kind of evolution happening, though not how I would do it. :)
by neuraxon77
Jan 19 2011 12:34pm
Forum: E-Bike Non-hub Motor Drives
Topic: zzzt, wow what a trip
Replies: 55
Views: 6034

Re: Secrets of high torque design.

I'm still wincing from the pain of having to read the OP first paragraph. :roll:

I too am glad Jeremy had the patience to correct this. :D
by neuraxon77
Jan 19 2011 10:49am
Forum: Motor Technology
Topic: Low Kv Motor Dyno Data/Sheets/Charts?
Replies: 19
Views: 4671

Re: Low Kv Motor Dyno Data/Sheets/Charts?

I'm going to update this thread anytime I find some low Kv dyno data. :) mrbill posted on the Mars Electric LLC Axial Flux Motor using a Cycle Analyst measuring energy in, and a PowerTap hub measuring energy out after 3?-stage reduction*. The Kv he listed is 90-97 depending on voltage. For other mrb...
by neuraxon77
Jan 14 2011 8:31am
Forum: E-Bike Build Threads / Photos & Video
Topic: Operation: Bazooka
Replies: 72
Views: 7645

Re: Operation: Bazooka

You need to embrase the wet weather riding. I think I've told this story before but I got caught in a downpour once and after being miserable for a few minutes at the water spraying in my face and being soaked I realised it was actually like jetskiing, then started enjoying it and steering for all ...
by neuraxon77
Jan 14 2011 8:27am
Forum: E-vents
Topic: EV Conference in San Jose
Replies: 6
Views: 1230

Re: EV Conference in San Jose

I love the old guy's quote that vehicles need to be "born electric, rather than shoehorned in". I know there is a huge shortage of mechatonic engineers at the moment, so it may take many years for the kids in uni that are just beginning to make Formula SAE electric cars and home projects to really f...