Just curious: is there any way to tell where the hub was made? If your suspicion is correct, Cannondale may have a bunch of defective hubs in their parts...
5619
Paulos, Richard G
rickpaulos
Sep 6, 2011 2:53 am
http://www.ebay.com/itm/170605907960 I've seen these DC motor/generators used on bicycles as a generator for household electric items such as xmas lights and a...
5618
Rich W
astronut1001
Sep 6, 2011 2:10 am
I suspect that it is possible, particularly if these are iM3 hubs made in China or the last of the German production. SRAM IGH production has been moved to...
5617
Jay Goldstein
wretiredwrider
Sep 5, 2011 9:28 pm
Thanks for the input. Is it possible that I've had the misfortune to get two defective i-Motion 3 hubs? I know that the 2nd gear rattle is not a figment of my...
5616
Rich W
astronut1001
Sep 5, 2011 4:28 pm
Agreed. A couple of bottle dynamos do have voltage output limiters in them, apparently intended to save halogen bulbs from being destroyed by high speed...
5615
Alex Wetmore
alexphredorg
Sep 5, 2011 3:44 pm
I don't think that any of the hubs have limiters in them. I know that Shimano and SON ones do not (I don't own hubs by any other companies). The lights or...
5614
David Chase
dr2chase
Sep 5, 2011 3:33 pm
A hub generates more power than a sidewall dynamo. The faster you go, the higher the power. According to the data at pilom.com you maximize your power by...
5613
pj
prester_john...
Sep 5, 2011 1:18 pm
Giles Berthoud showed a machined aluminum shifter for the Rohloff hub deigned for dropped bars @ Eurobike: ...
5612
thon_thon
dharickson
Sep 5, 2011 12:59 pm
if i use hub dynamo 6v/3w what is the maximum value of power can generate and in what speed? what would be the better output, to use the 6v/3w hub dynamo or...
5611
conboymike
Sep 5, 2011 9:30 am
Dear Group, Thanks for being here in cyberspace! I have a BikeE E2 tandem recumbent that my wife and I ride 80-100 mile per week, commuting. I plan to...
5610
Rich W
astronut1001
Sep 5, 2011 3:37 am
Swap, wanted and for sale posts have been allowed and will be until I become aware of a problem. It is asked that replies be done off group direct to the...
5609
jsharvey61
Sep 5, 2011 1:22 am
If trading posts are allowed please consider trading with me; if this type of post is not allowed please delete this one ASAP. I have a Sturmey Archer 1/2"...
5608
David Chase
dr2chase
Sep 5, 2011 1:12 am
... Which is why, in pursuit of thwarting the better idiot (i.e., me, and my kids) I build systems with no switch, and continuous soldered wires end-to-end....
5607
Rich W
astronut1001
Sep 4, 2011 6:44 pm
Per some web information I have seen in the past, under open circuit conditions at high speed the output terminal voltage on a hub dynamo can get to the 50+...
5606
Rich W
astronut1001
Sep 4, 2011 6:32 pm
No one has made what you want commercially that I am aware of. The problem is that for high power output the drag becomes unacceptable as the energy to run...
5605
Paul Toigo
patoigo
Sep 4, 2011 2:15 pm
How's your German? I interpret that the SON can output 12V at 20km/hr, but never more than 0.5A. From Schmidt's website: ...
5604
David Chase
dr2chase
Sep 4, 2011 1:10 pm
You should be fine with a voltage doubler, not sure about the current. Pilom.com has a lot of information that might help you: ...
5603
chkamb@...
chkamb
Sep 4, 2011 11:12 am
Hi, most hub dynamos deliver more than 6V and have a built in voltage limiter of some sort. If you have a hub dynamo for experiments try to run it without the...
5602
thon_thon
dharickson
Sep 4, 2011 9:34 am
i need a hub dynamo to generate high voltage and convert it in DC to store it into a storage battery to use it in my other features in my bike! like motors and...
5601
wahooncx@...
wahooncx
Sep 3, 2011 8:05 pm
I knew somebody would straighten me out... Also if memory serves S-A made an 8 volt for a short period of time. I am traveling and can't access the S-A...
5600
pj
prester_john...
Sep 3, 2011 7:47 pm
... No clanking/clunking/rattling from my iMotion3 in any gear. This hub is used on a bikefriday tikit (16" wheel) and has maybe a couple thousand miles on it...
5599
pj
prester_john...
Sep 3, 2011 7:44 pm
... The GH12 debuted in 1936 and was built until the war. Beginning in 1945 Sturmey-Archer built only 6V dynohubs. ...
5598
wretiredwrider
Sep 3, 2011 7:00 pm
Follow-up. I made numerous trips to the LBS trying to get them to fix the clank/rattle on bumpy surfaces which I described in my original message. The owner...
5597
wahooncx@...
wahooncx
Sep 3, 2011 6:56 pm
The only 12v hub dyno that I am aware of was a very early Sturmey-Archer model from around 1930. Why do you need 12 volts? Sent from my Verizon Wireless...
5596
David Chase
dr2chase
Sep 3, 2011 5:26 pm
... That was me, and there's no "apparently" about it. It got a load of water in its power fiddling circuits, and subsequently failed. I got completely...
5595
David Chase
dr2chase
Sep 3, 2011 5:24 pm
The hub dynamo is actually a hub alternator. It produces AC, not DC. The power output depends upon how much current you draw, because high current loads will...
5594
Rich W
astronut1001
Sep 3, 2011 4:41 pm
Welcome to the group. I do not know of a hub dynamo rated for more than 6v, 3watts but actual power output can be far more than that at higher speeds. The...
5593
erickson osit
dharickson
Sep 3, 2011 3:57 pm
ah, Ok! is that the hub dynamo can only generate at 6v/3w? i think its defend on the speed, right? ________________________________ From: David Chase...
5592
David Chase
dr2chase
Sep 3, 2011 2:45 pm
I am not sure such a thing exists. If DC is okay, you can build a voltage doubler with 4 diodes and 3 electrolytic capacitors. Hub dynamos also zoom their...
5591
thon_thon
dharickson
Sep 3, 2011 1:40 pm
i need a hub dynamo that generate 12volts, i need it in my project! please help me, email me or contact me me in this number 09154897531! thank you very much!...
