Comments on: Shimano Dynamo Hubs http://www.bikecommuters.com/2007/03/14/shimano-dynamo-hubs/ Bike Your Drive! Wed, 08 Feb 2012 22:39:52 +0000 hourly 1 http://wordpress.org/?v=3.0.4 By: Get up to 12.8w from the shimano / SON dynamo hub at Bike Commuters http://www.bikecommuters.com/2007/03/14/shimano-dynamo-hubs/#comment-128 Get up to 12.8w from the shimano / SON dynamo hub at Bike Commuters Mon, 09 Apr 2007 16:06:09 +0000 http://www.bikecommuters.com/2007/03/14/shimano-dynamo-hubs/#comment-128 [...] of our readers, KTronik left a comment on the Shimano Dynamo Hub report we posted. [...] [...] of our readers, KTronik left a comment on the Shimano Dynamo Hub report we posted. [...]

]]> By: ktronik http://www.bikecommuters.com/2007/03/14/shimano-dynamo-hubs/#comment-127 ktronik Mon, 09 Apr 2007 08:29:48 +0000 http://www.bikecommuters.com/2007/03/14/shimano-dynamo-hubs/#comment-127 Hi, FYI... I have found a way to get up to 12.8w from the shimano / SON dynamo hub, using a series cap before the refictior, into 3 series LEDs... I have different curves that I use for on or off road use... the fastest curve gives 1150ma into 3 series LEDs @40km/hr...but I mainly use a flatter curve...peak 910ma @ 27.5 km/hr into 3 series LEDs... I have built a few lights using cree xr-e & SSCp4 LEDs...so my lights, powered from the shimano dynamo maxes out @ 720lm+!! giving HID bright lights from a dynamo... pics: http://ktronik.com/LED.html its a really simple circuit to get it going, with extra mods for extra functions if needed...it can be customised for any type of riding / speed... normally the hub, wants to give 500ma @ all speed by changing the voltage... by holding the voltage low (series cap), the current rises using a 100uf Bi-polar cap in series before the bridge ref I get: 7km/hr=8.47v @ 50ma 15km/hr=9.44v @ 250ma 23km/hr=10.24 @ 610mq 27.5km/hr=10.62 @ 910ma 37km/hr=10.14 @ 630ma using a 200uf bi-polar cap in series before the bridge ref I get: (same speeds as above) 100ma, 480ma, 18km/hr peak @ 660ma, then 600ma @ 24km/hr, I use this curve for off road racing & the 100uf curve for on road commute... I bigger the cap the more boost down low & the less peak power... you can mix 2 different curves together, or even mix in a voltage doubler for up to 75ma @ 4km/hr, 100ma @ 5km/hr & 200ma @ 7km/hr... so a lot can be done just by using a series cap before the bridge ref... he dynamo hub could be used for powering equipment in the day...maybe use a LM7805 to give USB power...GPS, MP3, phone charging, ect you also could use the circuit to charge battery's & run your stuff off that, that way when you stopped your GPS wouldn't turn off... & yes you would have a little switch box on your bar to select the different riding curves / low speed boost or battery charging... all this can work... & its all very easy to do... I been testing this circuit with both shimano & SON hubs, for about 2 years... not one problem...now that the new breed of LEDs are out, it makes sence to dynamo it up!! my dynamo light is now as bright as a HID (on paper) BTW the cree LED is a better bet rather than the SSC p4... it has less colour shift when over driven & less colour shift over time...the seoul is also a more floody type of beam... I use the SSC P4 of off-road racing using the 200uf curve (peak 660ma)& the cree on-road with the 100uf curve (peak 910ma)... I have full data for DIYers if needed... just drop me a email... best Ktronik Hi,

FYI…

I have found a way to get up to 12.8w from the shimano / SON dynamo hub, using a series cap before the refictior, into 3 series LEDs…

I have different curves that I use for on or off road use…

the fastest curve gives 1150ma into 3 series LEDs @40km/hr…but I mainly use a flatter curve…peak 910ma @ 27.5 km/hr into 3 series LEDs…

I have built a few lights using cree xr-e & SSCp4 LEDs…so my lights, powered from the shimano dynamo maxes out @ 720lm+!! giving HID bright lights from a dynamo…

pics:

http://ktronik.com/LED.html

its a really simple circuit to get it going, with extra mods for extra functions if needed…it can be customised for any type of riding / speed…

normally the hub, wants to give 500ma @ all speed by changing the voltage…

by holding the voltage low (series cap), the current rises

using a 100uf Bi-polar cap in series before the bridge ref I get:

7km/hr=8.47v @ 50ma
15km/hr=9.44v @ 250ma
23km/hr=10.24 @ 610mq
27.5km/hr=10.62 @ 910ma
37km/hr=10.14 @ 630ma

using a 200uf bi-polar cap in series before the bridge ref I get: (same speeds as above)

100ma, 480ma, 18km/hr peak @ 660ma, then 600ma @ 24km/hr, I use this curve for off road racing & the 100uf curve for on road commute…

I bigger the cap the more boost down low & the less peak power…

you can mix 2 different curves together, or even mix in a voltage doubler for up to 75ma @ 4km/hr, 100ma @ 5km/hr & 200ma @ 7km/hr…

so a lot can be done just by using a series cap before the bridge ref…

he dynamo hub could be used for powering equipment in the day…maybe use a LM7805 to give USB power…GPS, MP3, phone charging, ect

you also could use the circuit to charge battery’s & run your stuff off that, that way when you stopped your GPS wouldn’t turn off… & yes you would have a little switch box on your bar to select the different riding curves / low speed boost or battery charging…

all this can work… & its all very easy to do…

I been testing this circuit with both shimano & SON hubs, for about 2 years… not one problem…now that the new breed of LEDs are out, it makes sence to dynamo it up!! my dynamo light is now as bright as a HID (on paper)

BTW the cree LED is a better bet rather than the SSC p4… it has less colour shift when over driven & less colour shift over time…the seoul is also a more floody type of beam…

I use the SSC P4 of off-road racing using the 200uf curve (peak 660ma)& the cree on-road with the 100uf curve (peak 910ma)…

I have full data for DIYers if needed… just drop me a email…

best

Ktronik

]]> By: Val http://www.bikecommuters.com/2007/03/14/shimano-dynamo-hubs/#comment-69 Val Fri, 23 Mar 2007 16:49:48 +0000 http://www.bikecommuters.com/2007/03/14/shimano-dynamo-hubs/#comment-69 Bill: You should be able to install any number of other lights on that dynamo. The Shimano switch is nifty, but not strictly necessary. The switch includes a regulator, which keeps the high voltage from fast speeds from burning out your lights, but many of the lights available today already have the regulator built in. The basic Union light in the pictures does, and any light that you find from Busch & Muller will also have overvoltage protection built in. Don't give up on the Dynamo - find a shop that knows about lights, and hook it back up. Also, if you like the Shimano lights, any shop that orders from Seattle Bike Supply can order one right now - we have them in stock. It's not really so crucial at this time of the year, but getting lit is never bad. Bill: You should be able to install any number of other lights on that dynamo. The Shimano switch is nifty, but not strictly necessary. The switch includes a regulator, which keeps the high voltage from fast speeds from burning out your lights, but many of the lights available today already have the regulator built in. The basic Union light in the pictures does, and any light that you find from Busch & Muller will also have overvoltage protection built in. Don’t give up on the Dynamo – find a shop that knows about lights, and hook it back up. Also, if you like the Shimano lights, any shop that orders from Seattle Bike Supply can order one right now – we have them in stock. It’s not really so crucial at this time of the year, but getting lit is never bad.

]]> By: Bill http://www.bikecommuters.com/2007/03/14/shimano-dynamo-hubs/#comment-67 Bill Thu, 22 Mar 2007 21:06:49 +0000 http://www.bikecommuters.com/2007/03/14/shimano-dynamo-hubs/#comment-67 Indeed, a great recycled and improved idea, and the main reason I invested in the dynamo-equipped Specialized Globe 3.1 instead of a comparably priced and equipped Cannnondale commuter. The problem: Shimano apparently cannot provide replacement parts. After a mild crash totaled the dynamo-driven headlight (with the dynamo off-on switch)my bike dealer, the reliable Gotham Bikes of Manhattan, ordered a replacement light from Shimano via Specialized. More than two months later, Speccialized says the part still remains unavailable. Meanwhile, the dynamo keeps spinning along...but I wish I had bought the Cannondale instead. Caveat emptor. Indeed, a great recycled and improved idea, and the main reason I invested in the dynamo-equipped Specialized Globe 3.1 instead of a comparably priced and equipped Cannnondale commuter. The problem: Shimano apparently cannot provide replacement parts. After a mild crash totaled the dynamo-driven headlight (with the dynamo off-on switch)my bike dealer, the reliable Gotham Bikes of Manhattan, ordered a replacement light from Shimano via Specialized. More than two months later, Speccialized says the part still remains unavailable. Meanwhile, the dynamo keeps spinning along…but I wish I had bought the Cannondale instead. Caveat emptor.

]]> By: Jim http://www.bikecommuters.com/2007/03/14/shimano-dynamo-hubs/#comment-37 Jim Thu, 15 Mar 2007 21:07:37 +0000 http://www.bikecommuters.com/2007/03/14/shimano-dynamo-hubs/#comment-37 thats a sweet looking hub, I wish I had seen this last week as I just purchased a new set of laced wheels for my commuter bike in Sac... I think I'll replace the hub on my wife's bike with one tho, as she loves her headlights at night!! JRM thats a sweet looking hub, I wish I had seen this last week as I just purchased a new set of laced wheels for my commuter bike in Sac…
I think I’ll replace the hub on my wife’s bike with one tho, as she loves her headlights at night!!
JRM

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