Search found 5644 matches

by safe
Feb 03 2009 7:50am
Forum: E-Bike Non-hub Motor Drives
Topic: * * * Ebike Simulation Program * * *
Replies: 52
Views: 4932

Re: * * * Ebike Simulation Program * * *

Chuck... you ought to download my simulation and go through the coding to look for errors.

Seriously...

In fact there are some issues that I'd like to improve and if you are interested in making those improvements then we could post a new version.
by safe
Feb 03 2009 7:19am
Forum: E-Bike Non-hub Motor Drives
Topic: Regen. with an RC set-up.
Replies: 90
Views: 9341

Re: Regen. with an RC set-up.

I knew that freewheels and regen had to be a trick somehow. :lol: Okay... I get the joke... it's a "freewheel" but you can also lock it when you want to... -------------------- Regen just seems like a lot of work for no real return. -------------------- I think we've covered all the "warnings to the...
by safe
Feb 02 2009 9:44pm
Forum: E-Bike Non-hub Motor Drives
Topic: Regen. with an RC set-up.
Replies: 90
Views: 9341

Re: Regen. with an RC set-up.

Miles wrote:Wrong answer, safe
Regen requires that the motor and rear wheel are connected.

You're going to have to argue otherwise... (I'm saying I'm correct)
by safe
Feb 02 2009 9:40pm
Forum: E-Bike Non-hub Motor Drives
Topic: Regen. with an RC set-up.
Replies: 90
Views: 9341

Re: Regen. with an RC set-up.

Why must we choose between having a freewheel or not? Because regen works by acting like a brake on the rear wheel. If the rear wheel is separated from the motor by a freewheel then it's impossible to do regen. Regen is not good for racing because it's not very effective in hard braking situations....
by safe
Feb 02 2009 9:33pm
Forum: E-Bike Non-hub Motor Drives
Topic: Regen. with an RC set-up.
Replies: 90
Views: 9341

Re: Regen. with an RC set-up.

I want freewheel for the motor too... Then you can't do regen. Regen is simply a controller modification... for the hub motors they already know how to change the circuits to make this happen. I don't think anyone has even gotten to the HARD PART on RC motor regen which is the circuitry changes tha...
by safe
Feb 02 2009 9:15pm
Forum: E-Bike Non-hub Motor Drives
Topic: Regen. with an RC set-up.
Replies: 90
Views: 9341

Re: Regen. with an RC set-up.

http://endless-sphere.com/forums/viewtopic.php?f=28&t=7641&p=118731&hilit=+s3x#p118731 Wow... somehow I missed that thread. :? Yes... the fixed gear three speed looks to be the "magic solution" to putting regen back onto multispeed ebikes. There only needs to be one freewheel and that's for the ped...
by safe
Feb 02 2009 9:06pm
Forum: E-Bike Non-hub Motor Drives
Topic: Regen. with an RC set-up.
Replies: 90
Views: 9341

Re: Regen. with an RC set-up.

Let me review the problem... If the goal is improved efficiency overall then it's pretty much a no brainer that adding gears will deliver higher overall efficiency over wider terrain types than a one speed even with regen. Hill climbing needs low gears, while downhills need high gears in order to ad...
by safe
Feb 02 2009 5:17pm
Forum: E-Bike Technical
Topic: Dissecting the Yi-Yun YK42-3 36v Controller
Replies: 14
Views: 5001

Re: Dissecting the Yi-Yun YK42-3 36v Controller

I've gone about 5,000 miles using this 36 volt controller and a significant portion was at 48 volts. So what did I do today? Pushed my luck? Yeah, well I had some wiring laying around and figured it would be fun to try rewiring my #001 bike as a 60 volt machine. I wired it up and since the capacitor...
by safe
Feb 02 2009 1:29pm
Forum: E-Bike Non-hub Motor Drives
Topic: Evaluating possibilities for non-hub motors.
Replies: 12
Views: 2039

Re: Evaluating possibilities for non-hub motors.

It's hard to come up with a simple answer when you ask 27 questions at once... :lol: You might prioritize your desires in an ebike and then match those up with you $$$ intentions. Every once and a while we get someone with what seems like bottomless pockets who shows up on the forum with a $2000+ bi...
by safe
Feb 02 2009 1:20pm
Forum: Battery Technology
Topic: Bike going up in smoke
Replies: 12
Views: 999

Re: Bike going up in smoke

Nimh and Nicad are particularly dangerous when they go wrong, they can explode like a grenade ejecting there casing like red hot razer sharp shrapnel. The guy in the link put his cells on a charger that trickle charged for 7 hours ... no wonder it exploded. :roll: You are only supposed to charge un...
by safe
Feb 02 2009 1:09pm
Forum: E-Bike Non-hub Motor Drives
Topic: Regen. with an RC set-up.
Replies: 90
Views: 9341

Re: Regen. with an RC set-up.

Now the problem with combining gearing and regen is that I don't think most gearing systems would much like being driven in reverse too much under load, since this implies using a large gear going slowly driving a small gear fast... which I believe is not a great situation normaly for gears... righ...
by safe
Feb 02 2009 11:10am
Forum: E-Bike General Discussion
Topic: .
Replies: 73
Views: 8252

Re: The "Most Miles" on Sla's Log

Oooooh competition.

4,000 miles is pretty darn good. :)
by safe
Feb 02 2009 11:09am
Forum: E-Bike General Discussion
Topic: Motorized Bottom Bracket
Replies: 21
Views: 6459

Re: Motorized Bottom Bracket

Kraeuterbutter, there is a section devoted specifically to the type of systems that you are working on. Try looking around in this area:

http://endless-sphere.com/forums/viewforum.php?f=28

...RC motors are the hottest thing in ebikes right now and we would love to have you post more in that area.
by safe
Feb 02 2009 11:04am
Forum: Battery Technology
Topic: Any experiences with TS-LFP20AHA ?
Replies: 2
Views: 630

Re: Any experiences with TS-LFP20AHA ?

"Cell balancing capability is a very beneficial feature to bring the cells within a pack more closed matched. We currently do not have cell balancers available. We are exploring in this direction. We welcome collaboration and partnership leading to most suitable solution in this area. We only recom...
by safe
Feb 02 2009 11:00am
Forum: Battery Technology
Topic: Increase SLA performance in winter!
Replies: 9
Views: 910

Re: Increase SLA performance in winter!

I did the battery heating by blowing heat from a heater against the cells from underneath. The result was that the cells did in fact heat up and start to work like they would in summer... but the unevenness of the heating seemed to have caused one of the cells to die a little earlier than I might ha...
by safe
Feb 02 2009 10:52am
Forum: Battery Technology
Topic: Bike going up in smoke
Replies: 12
Views: 999

Re: Bike going up in smoke

It's worth showing the image...

Image

...makes one think that a true "crash and burn" could be possible if everyone used LiPo. :shock:
by safe
Feb 02 2009 10:05am
Forum: E-Bike Non-hub Motor Drives
Topic: Regen. with an RC set-up.
Replies: 90
Views: 9341

Re: Regen. with an RC set-up.

Existing multispeed gearing systems require a freewheel. While I agree that regen is never a bad thing (it is never worse than a freewheel on an energy level) if in the process of designing your bike you choose a regen system and fail to see the value of multispeed gearing then you are making a mist...
by safe
Feb 02 2009 9:50am
Forum: E-Bike Non-hub Motor Drives
Topic: Evaluating possibilities for non-hub motors.
Replies: 12
Views: 2039

Re: Evaluating possibilities for non-hub motors.

Right now I am aiming for a single-speed bike with a speed of about 16 mph. For this kind of thing a hub motor is the way to go. Once you cross the threshold of about 20 mph you either have to go for big power or multispeed gearing. Since many bikes already have multispeed gearing built into them t...
by safe
Feb 02 2009 9:42am
Forum: E-Bike Build Threads / Photos & Video
Topic: Safe's Electric Bike Project #002
Replies: 493
Views: 63895

Re: Safe's Electric Bike Project #002

Remember that Missouri moped regulations prohibit manual gear change. Actually they prohibit a clutch lever for the left hand. The logic was that little kids have troubles being coordinated enough to use a clutch while learning to ride a moped. You need one of those "centrifugal clutches" to be leg...
by safe
Feb 02 2009 9:18am
Forum: E-Bike Non-hub Motor Drives
Topic: Learning curve. Doing stuff on our own bikes.......
Replies: 17
Views: 1846

Re: Learning curve. Doing stuff on our own bikes.......

I worked at a bike shop for several years as a teenager. So I have experience with everything that existed in that era... but a lot has changed since the 1980's so there are still parts here and there that I have not dealt with.

My first wheel build was in about 1976. :)
by safe
Feb 01 2009 3:58pm
Forum: E-Bike Non-hub Motor Drives
Topic: Analysis of a flywheel's potential!
Replies: 20
Views: 3054

Re: Analysis of a flywheel's potential!

http://www.racecar-engineering.com/imageBank/cache/d/DSCF1508_e_1b94af32f911a55669ca5250367871cd.jpg I'm in agreement that a flywheel is the best high energy storage system for storing the braking force. That was the conclusion of the experts who studied KERS. Pound for pound a flywheel can store m...
by safe
Feb 01 2009 3:51pm
Forum: E-Bike Non-hub Motor Drives
Topic: Regen. with an RC set-up.
Replies: 90
Views: 9341

Re: Regen. with an RC set-up.

The Superbowl is getting near... but this is one idea to ponder.... (while drunk :lol: ) KERS vs Regen.gif Let's say you wanted to race in the Tour De France. It's a long race and you would probably really want some kind of regen, but the question becomes whether "classic" regen would help you any. ...
by safe
Feb 01 2009 3:31pm
Forum: E-Bike Non-hub Motor Drives
Topic: Analysis of a flywheel's potential!
Replies: 20
Views: 3054

Re: Analysis of a flywheel's potential!

Mathurin wrote:...maybe an RC outrunner inside with an machined cylinder around it. Seems like it could do it.
That's how I see it... something about the same size as an RC motor only attached to the front wheel.

The weight needs to be 2-3 lbs at most.
by safe
Feb 01 2009 3:21pm
Forum: E-Bike Non-hub Motor Drives
Topic: Analysis of a flywheel's potential!
Replies: 20
Views: 3054

Re: Analysis of a flywheel's potential!

http://www.racecar-engineering.com/imageBank/cache/d/DSCF1508_e_1b94af32f911a55669ca5250367871cd.jpg You might have missed this... posted elsewhere... http://www.racecar-engineering.com/articles/technology/281974/f1-kers-bosch-goes-modular.html “The flywheels are basically a simple electric m...
by safe
Feb 01 2009 1:27pm
Forum: E-Bike Non-hub Motor Drives
Topic: Analysis of a flywheel's potential!
Replies: 20
Views: 3054

Re: Analysis of a flywheel's potential!

The point is that something like KERS could actually be of some value because it prefers to capture things like hard braking. The existing regen system does not work in the environment that a sport rider rides in. Existing regen makes some sense for someone doing a slow speed cross country trek, but...