Power in Flux

What's on your mind?


[140]

Live Feed

Ted Dillard replied to the thread Debate of the Day: Experimental Chain Tensioner.
" ^ What he said.

Have you checked out conventional industrial solutions? I'd think they'd be a lot more to the point than bicycle products. See this: http://www.brewertensioner.com/tensi...sitioners.html and this, for starters: http://www.roll-ring.com/?lang=en

I know you like the movies, so here:

https://youtu.be/-qhVOW--QSs

...also this:

https://www.youtube.com/watch?v=QPaz7qYTYWM

(complete with Happy Music) "

20 Minutes Ago

Ted Dillard clicked Likes for this post: Debate of the Day: Experimental Chain Tensioner by Spoonman

22 Minutes Ago

Spoonman replied to the thread Debate of the Day: Experimental Chain Tensioner.
" Dunno about that notion dude.
With the weight of the chain and its velocity at even relatively slow speeds, I expect it'll just be a mess - you'd be better staying as you are at that stage.
I still reckon you could stand to loose a link in the setup you have, trim it out using the adjustment available, and up the tension on that tensioner a good chunk - it doesn't seem too far from a workable solution as it is. "

3 Hours Ago

Ted Dillard replied to the thread Power in Flux excerpt: The Blade.
" MOAR:

The attention the bikes got in the mountain bike and motocross
communities was no surprise. Schless had a long resume of work in those
markets, as well as in electric vehicle circles:

“… I won the Phoenix Solar and Electric 500 race, both the commuter
and formula classes in '92 and 93 in cars sponsored by Trojan Batteries and
Honda R&D. The formula car had quick change batteries and I did 8 pit
stops in the 100 mile oval track race. The fastest swap was 12 seconds. The
longest was 19. Also, I hold a world record for the most number of miles
traveled in 24 hours in an electric car that I built for Delco Remy /
Aerovironment back in 94. It used a quick swap battery system that I
designed. I built 2 of these cars for them and used them to test batteries in
for the impact because the battery swap was so easy; under 1 minute to
swap a 1200 lb. battery with no tools required.”

He’d also built a few cars working with AC Propulsion’s Alan Coconni
back in the early 90's. The cars used 27 Optima lead-acid batteries in series:
1200 pounds, 336 volts, ~12kWh. Coconni had a BMS of sorts, but it was to
monitor degradation, not balance levels. Much of the system design is what
Tesla’s current technology was built on, and, though he didn’t actually
contribute in a hands-on way to the design and building of the fairly
legendary tzero, (the car that Tesla founder Martin Eberhard was driving
when he challenged Malcom Smith to “…try to touch the dashboard”), he
did, at one point, offer some advice to Coconni while the car was being
built:

“I actually helped Alan a little when he built it. He had designed and
was building the stainless steel frame from thin-wall 1" square tube, which I
thought was stupid, and I still do to this day. But he was convinced that it
had better crash test models than plain steel, so I gave him some TIG
welding tips. I recall being in his shop in San Dimas, rolling my eyes, with
Paul and Dave, his two partners nodding in silent agreement.”

stay tuned... "

3 Hours Ago

Spoonman clicked Likes for this post: Noise issue related to Curtis 1238 by mpipes

3 Hours Ago

mpipes replied to the thread Noise issue related to Curtis 1238.
" Progress. Snooped inside the headlight housings (metal) and saw that the park/turn lamp socket assembly is screwed directly to the housing and has the ground wire attached at one of the screws. Simple fix there with relocating the socket mount into a plastic case and running the ground into it instead of the metal housing. Looks like it's a similar situation inside the rear tail lights, those are tougher to get access to so I havent torn into it yet. I also bumped the drive pulley while navigating around the shop and noticed that the brightness of the tail lights fluctuated. Looks like I get to isolate the traction motor from the chassis now too. "

12 Hours Ago

Ted Dillard replied to the thread Power in Flux excerpt: The Blade.
" Well, I talk a little bit about that in that chapter. Ultimately, I feel it's a matter of timing. I'll maybe post some from that... but yeah, I do cover it. "

14 Hours Ago

Richard230 replied to the thread Power in Flux excerpt: The Blade.
"
Quote Originally Posted by Ted Dillard View Post
Chapter 4, p70 - "Looking for the Crux" - first subject is Electric Motorsport, second is Vectrix. (In which I quoted a "Richard Harmon"!)

to wit:

"Within a few years, Electric Motorsports
would source frames from Tiger Motors, Inc., a Thailand based company
that had a small array of 250cc motorcycles and scooters of its own,
including the eBoxer, an electric motorcycle similar to the GPR-S. They
(Tiger) had affiliations with some major manufacturers, including Sachs,
Yoshimura, and others, and it appeared that Chinese motorcycle
manufacturer Zongshen supplied much of their motorcycle chassis. This
would give EMS instant access to a DOT certified, street-legal platform."
I recall that. What I wondered was how did those characters manage to kill their goose and what ever became of them and their Native motorcycle operation? It seemed as though as soon as Brammo came out with the Enertia, they headed for the hills, never to be seen again - at least not by me. "

15 Hours Ago

Ted Dillard replied to the thread Motenergy ME1302.
" No problem - I've basically spent the entire day so far surfing here and other places. LOL Not too busy at work atm.

Check this out - https://www.goldenmotor.com/ Scroll down to the 3KW BLDC Motor. Not too shabby.

Attachment 7972

I think that (at 3000 RPM!) could get you going fast enough to scare the b'jeesus outta you (isn't that the point?), and it's only 17lbs or so, 6" in diameter, and cheap. It has a liquid cooling, and a 72V option too. You could run it dry, it leaves more room for batteries, and you can add cooling if it starts getting all melty. I haven't used the Goldens, but I know they're not uncommon for the smaller mini and bicycle conversion builds. "

19 Hours Ago

JD167 replied to the thread Motenergy ME1302.
" wow thanks for the quick responses guys! and no, I am not trying to go 70 hahaha I would be happy with 45. My goals for the build are 1. being able to out pace my stock KLX110 2. getting around 45 min of ride time per charge 3. keeping weight and handling characteristics as close to or better than an i.c.e bike as possible. I checked out the ME0909 and it sounds like a great option, the supplier said they have put them in mini bike before and they feel significantly faster than a stock XR100 so I'm thinking this might be the motor I need. "

19 Hours Ago

Ted Dillard replied to the thread Motenergy ME1302.
" ...yeah, that's only 24lbs- same weight as the ETEK. 48V would be fine, too - you don't want to go over 70 on that thing, do you? "

20 Hours Ago

Stevo replied to the thread Motenergy ME1302.
" ME0909 would be a good choice for a lil mini/pit bike
I have a controller that you can buy cheap (Alltrax AXE4834)
I'll even throw in a contactor and a main fuse/holder "

20 Hours Ago

Stevo clicked Likes for this post: Power in Flux excerpt: The Blade by Ted Dillard

20 Hours Ago

Stevo replied to the thread Proper Forum Etiquette.
" funny? Nah... cute? maybe "

20 Hours Ago

Ted Dillard replied to the thread Power in Flux excerpt: The Blade.
"
Quote Originally Posted by Stevo View Post
It almost looks like one of these: Oset

I thought I read somewhere that GasGas was prototyping an e version trials bike. Electric torque x silence x trials riding=perfect marriage
...more correctly, the Oset looks a lot like this.

The Oset, though, is strictly a kid's bike AFAIK. "

20 Hours Ago

Ted Dillard replied to the thread Motenergy ME1302.
" OoooOOoo. I was going to quip something about overkill being impossible, until I looked up the bike.

Yeah, that's a badass motor that I'd put into at least a 350cc frame, but more better a 600cc frame. I'd say for a mini-bike mini-cycle type of thing, I'd be going with a brushed, smaller, cheaper motor, but I can't seem to find a Motenergy that's lighter. Too bad you couldn't find an original ETEK, that'd be perfect.

I did a post a while back on horsepower ratings, maybe this will help: https://evmc2.wordpress.com/2012/04/...-the-universe/

Oh... and WELCOME! "

20 Hours Ago

Stevo replied to the thread Power in Flux excerpt: The Blade.
" It almost looks like one of these: Oset

I thought I read somewhere that GasGas was prototyping an e version trials bike. Electric torque x silence x trials riding=perfect marriage

To take a stab at one of Richard's questions... Battery tech is what's keeping these small companies from going big. The tech just isn't there yet to make any of these truly marketable. Ely has it right when he's talking about gasoline equivalent. THAT phrase, "gasoline equivalence", is brilliant terminology! "

20 Hours Ago

Stevo clicked Likes for this post: Power in Flux excerpt: The Blade by Ted Dillard

20 Hours Ago

Stevo replied to the thread Noise issue related to Curtis 1238.
"
That voltage shouldnt be there at all though, and while dim lights arent a big deal, the future audio system picking up any noise is.
Maybe if you wire a filter into the audio circuit input, there wont be any issues with noise. Audio is an awesome idea ... it's got me thinking!!!... "

21 Hours Ago

JD167 created the thread Motenergy ME1302.
" Hey everybody,

My name is JD and I am new to electric motorcycles and electric motors in general really haha. I have a KX65 collecting dust in my garage and would like to do an electric conversion to it and use it mainly as a after hours pit bike on my backyard track. I have seen a couple mini-bike conversions using modded oset motors etc. but I want the bike to have power equal to around 20hp +/- and was told a water cooled brushless motor would be my best bet. I have been looking at this ME1302 model and was wondering if it would be total overkill or a good option for my project. here is the description from the web store:

Designed for long life. No brush maintenance. The motor is 92% efficient at voltages between 24 to 96 VDC. Continuous current of 125 amps AC (180 Amps DC into the motor control). This is a 3-phase, Y-connected Permanent Magnet Synchronous Motor with an axial air gap. It has two stators with a rotor in the center.

1) This is a 4 pole motor (8 magnets). 2) The Phase to Phase winding resistance is 0.013 Ohms. 3) The maximum recommended rotor speed is 5000 RPM. 4) Voltages from 0 to 96 VDC input to the control. 5) Torque constant of 0.15 Nm per Amp 6) The Inductance Phase to Phase is 0.10 Milli-Henry with 28 turns per phase. 7) Armature Inertia is 45 Kg Cm Squared. 8) Peak current of 420 Amps AC for 1 minute (600 Amps DC into the motor control). 9) Weight of 35 pounds. 10) Peak Stall Torque of 60 FtLb.

Most of this might as well been chinese as far as my understanding goes but i've ordered a couple books on electric motors and electric vehicle conversions to hopefully change that but what i did see was a peak stall torque rating of 60 ft/lbs and that seemed like wayyyyyy to much for a pit bike. Can you adjust power delivery with a controller and battery set up or am I on the wrong track with a motor like this?

Any advice is greatly appreciated,

JD "

21 Hours Ago