Throttle Limiter and Emergency Stop Added

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Matt Gruber   1 MW

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Post by Matt Gruber » Mar 22 2007 10:33am

might want to add a momentary push button, L thumb, to bypass the perfectly set pot, for temporary boost.
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Reid Welch   10 MW

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Post by Reid Welch » Mar 22 2007 3:37pm

Matt Gruber wrote:might want to add a momentary push button, L thumb, to bypass the perfectly set pot, for temporary boost.
:idea: :idea:
(humor follows)

You two, Paul and Matt, are one, no, two, hundred Watt light blubs.
Kudos!
Great ideas!
I will copy, call them my own and waive fees for you guys
for one royalty-free flush-button potty throttle bike apiece.
Deal?

-Bill Gates-
:wink:

_____________
Seriously, Paul: nice idea!
You may go on now and use it---yes, you have my permission.
Technically, in this app, you've wired it as an adjustable resistor,
not as a pot to piss on.

-Bill Grates-
:twisted:

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knoxie   10 MW

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Post by knoxie » Mar 22 2007 4:19pm

Hi Folks

Ha ha no videos of me flipping the bike! ha ha thats too scary to do again, the adjuster is neat I can really tweak it down so its all I need as I just dont need 2KW of power all the time but I can if I want turn the dial up.

I had thought of putting in a button but dont think I will for now, as the sudden jump in amps is kind of the reason I put the potentiometer in.
I can dial in easily whilst riding as well.

And yes Richard it may be a little different with a hall throttle, its funny as I never thought I would want to slow it down! ha ha so glad I have now and I would recommend this to anyone with a higher power bike, its a great mod.

Cheers

Paul

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Reid Welch   10 MW

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Post by Reid Welch » Mar 23 2007 8:05am

Paul, consider Matt's idea again: the button, a N.O. switch to momentarily bypass the throttling pot.

I'm gonna do that for sure! Button on the left bar, pot there too I think.

Great ideas. Thanks.

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knoxie   10 MW

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Post by knoxie » Mar 23 2007 5:36pm

Hi Reid

Yes it is a good Idea and I have thought of it and may add it at some point, I want to try not to as I want to try and keep within the speed I set for myself.

I like to exercise and stay fit as well as get the benefit from the assist, the gearing on my mtb means any useful peddle input tails off at 25mph, the bike will do 32mph all day, so the mod was put in place for safety and also my general well being, fitness! its too easy to push a button but harder to reach over and turn the dial 1 handed! ha ha

I did the mod in the week, now the weekend is upon us I intend to do my first ride with the mod in place, I will hook in the watts up meter and see just how much it helps, I will do at least 30 miles my usual route and dial in an assist of no more than 15mph and will report back how i find it.

I am back down to 48V now, my NIMH packs are wearing a little as I think I must have hit 250+ cycles on them, still they are working but do sag under heavy amps now, maybe time to go lipo for good soon.

Cheers

Knoxie

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Reid Welch   10 MW

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Post by Reid Welch » Mar 23 2007 11:50pm

How much do NiMH packs sag under load?

Indications of their series resistance, both when new, and then increasing with age, dissuaded me from going that much cheaper way.

I think it was estimated that a 36V pack of F cells might sag more than 6V at my bike's max draw of say 20 or 30 A.

That's too much wastage of emf gumption to be attractive here.

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Toorbough ULL-Zeveigh   10 MW

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Post by Toorbough ULL-Zeveigh » Mar 24 2007 2:39am

Reid Welch wrote:How much do NiMH packs sag under load?

Indications of their series resistance, both when new, and then increasing with age, dissuaded me from going that much cheaper way.

I think it was estimated that a 36V pack of F cells might sag more than 6V at my bike's max draw of say 20 or 30 A.

That's too much wastage of emf gumption to be attractive here.


Assuming the BSpace figure of 5 milliohms per cell when new, 30 cells in series would sag 3 volts at 20 amps & 4.5V at 30 amps.

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Last edited by Toorbough ULL-Zeveigh on Mar 24 2007 7:54am, edited 1 time in total.
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knoxie   10 MW

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Post by knoxie » Mar 24 2007 6:52am

Hi

Yes I think if I was going to go the NIMH route again with my greedy bike I would run 2 x parallel packs at about 40V, that would ensure longer cycle life and still a nice high split amp draw off each pack.

Its the deep discharges that deplete the batteries, If you halve it they will last twice as long. My batteries are still ok and can dish out 13A hours, its just they sag under heavy load. 48V down to 42V

I am going out for a nice run today so we will see how they cope, I have got so many choices thanks to Mark at Team Hybrid and his Aladdin's cave of batteries! ha ha I am quite literally spoilt for choice.

I still like NIMH but Lipo packs are amazing, there are so many new lithium based packs coming up through the system its really a sea change time.

Have fun

Knoxie

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Reid Welch   10 MW

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Post by Reid Welch » Mar 24 2007 7:47am

Thanks Toor and Paul.

Paul, do you have a part number for that pot?
I should like to find one Stateside--it must be available here too.


Thanks,
Reid

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Post by knoxie » Mar 24 2007 8:06am

Hi Reid

You can pretty much use what ever pot suits, is your throttle hall or resistive? if it is hall you will need a relativley high value, Fechter has covered this and it will need to go in the wiper not the feed.

The pot i used is this one, you should be able to get an equivalent one in the states, this one I chose as it is waterproof works even under water!

Here it is

http://tinyurl.com/37w3nx

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Reid Welch   10 MW

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Post by Reid Welch » Mar 24 2007 8:20am

Thank you again. Yes, it's your waterproof pot that I would want.
I'm familiar with pots in general from past work on antique electronics.
The usual carbon-on-phenolic don't much like to be soaked, ha ha.
Guess it should be conductive plastic or cermet.

The Currie mongoose throttle is said to be Hall effect.

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erth64net   100 W

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Post by erth64net » Nov 29 2008 12:10pm

knoxie wrote:Hi Reid

You can pretty much use what ever pot suits, is your throttle hall or resistive? if it is hall you will need a relativley high value, Fechter has covered this and it will need to go in the wiper not the feed.

The pot i used is this one, you should be able to get an equivalent one in the states, this one I chose as it is waterproof works even under water!

Here it is
http://tinyurl.com/37w3nx
That link appears to now be broken, can you post any details of the part used? I'm very eager to waterproof my throttle :shock:
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swbluto   100 GW

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Re: Throttle Limiter and Emergency Stop Added

Post by swbluto » Nov 29 2008 11:24pm


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erth64net   100 W

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Re: Throttle Limiter and Emergency Stop Added

Post by erth64net » Dec 14 2008 7:22am

swbluto wrote:http://www.precisionsales.com/potentiom ... rproof.htm

Here's a few water-proof pots.
Thanks for the link. I contacted these folks, and they simply wanted nothing to do with small one-off orders :-(

On the other hand, I did finally figure out what your original URL pointed to:
PE30 cermet pot,4K7 lin 20mm 3W (1885470, aka: PE30AM4.7K10%A)

URL:
http://uk.rs-online.com/web/search/sear ... rm=1885470

I'm assuming you've had no issues in the rain with this?
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erth64net   100 W

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Re: Throttle Limiter and Emergency Stop Added

Post by erth64net » Dec 24 2008 12:04am

erth64net wrote:
swbluto wrote:http://www.precisionsales.com/potentiom ... rproof.htm

Here's a few water-proof pots.
Thanks for the link. I contacted these folks, and they simply wanted nothing to do with small one-off orders :-(

On the other hand, I did finally figure out what your original URL pointed to:
PE30 cermet pot,4K7 lin 20mm 3W (1885470, aka: PE30AM4.7K10%A)

URL:
http://uk.rs-online.com/web/search/sear ... rm=1885470

I'm assuming you've had no issues in the rain with this?
Here's a US distributor: http://www.alliedelec.com/Search/Produc ... L0FL472MAB
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