#1
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dynamo rebuilding
I have a couple old but functional dynamo - One bottle, one roller. I'm
wondering if the electrical efficiency/efficacy can be improved by rebuilding the dynamos. Has anyone have any experience with this? I understand that i could potentially rewind the coils, replace the bearing but how practical is this ... Before i attempt it on an otherwise functional device. What else is practical to change; the magnet? More poles? Any other interesting hacks or improvements? |
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#2
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dynamo rebuilding
On Fri, 1 Apr 2016 10:20:16 -0000 (UTC), Yin goo
wrote: I have a couple old but functional dynamo - One bottle, one roller. I'm wondering if the electrical efficiency/efficacy can be improved by rebuilding the dynamos. Has anyone have any experience with this? I understand that i could potentially rewind the coils, replace the bearing but how practical is this ... Before i attempt it on an otherwise functional device. What else is practical to change; the magnet? More poles? Any other interesting hacks or improvements? I suspect not other than making sure the bearings are lubricated. Well, I guess that would depend on how much you understand electrical engineering and what tools you have. I have a Sanyo roller and Andrew sent me instructions on how to tear down and rebuild it. Probably has to be done ever 10 years or so. The modern hub dynamos are very very good- Schmidt, Shimano, Shutter, etc. The new generation of LED head- and taillights are likewise very good. While I found my halogen headlights perfectly fine for all-night rides in the country, the LEDs are usefully brighter and the optics are improved to focus the light on the road and not in driver's eyes. If you really want to improve the utility of your existing dynamos, just upgrade the lights. My Schmidt eDelux is excellent and there are some more refined lights that have come out since. |
#3
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dynamo rebuilding
"Yin goo" wrote in message ... I have a couple old but functional dynamo - One bottle, one roller. I'm wondering if the electrical efficiency/efficacy can be improved by rebuilding the dynamos. Has anyone have any experience with this? I understand that i could potentially rewind the coils, replace the bearing but how practical is this ... Before i attempt it on an otherwise functional device. What else is practical to change; the magnet? More poles? Any other interesting hacks or improvements? The old Sturmey Archer hub dynamos had very low remenance magnets that lost their power instantly if you removed the coil assembly from them. Other dynamos of the same era probably used similar materials for the magnet. There's a blog floating about the web somewhere - someone built their own SA magnet ring by bonding neodymium magnets to a steel hoop, they claimed a significant increase in output. |
#4
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dynamo rebuilding
On Fri, 1 Apr 2016 10:20:16 -0000 (UTC), Yin goo
wrote: I have a couple old but functional dynamo - One bottle, one roller. I'm wondering if the electrical efficiency/efficacy can be improved by rebuilding the dynamos. Has anyone have any experience with this? I understand that i could potentially rewind the coils, replace the bearing but how practical is this ... Before i attempt it on an otherwise functional device. What else is practical to change; the magnet? More poles? Any other interesting hacks or improvements? The output of a generator is dependent on the speed of rotation and the number of poles and the strength of the magnetic field. It will probably be very difficult, or impossible, to change the number of poles but it might be possible to increase the strength of the magnets. -- cheers, John B. |
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