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Rim drive electric motor
On two of my bikes, I've got bottle dynamos modified to run on the rim's braking
surface. A thick O-ring "tire" mounted in the dynamo's drive wheel seems to give a much smoother drive than the usual drive via the tire's sidewall. It also seems to be less likely to slip when wet, although I admit that's been tested only rarely. This motor drive turns the idea around. http://www.velogical-engineering.com/rim-dynamo-en - Frank Krygowski |
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#2
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Rim drive electric motor
On 2016-05-27 13:02, Frank Krygowski wrote:
On two of my bikes, I've got bottle dynamos modified to run on the rim's braking surface. A thick O-ring "tire" mounted in the dynamo's drive wheel seems to give a much smoother drive than the usual drive via the tire's sidewall. It also seems to be less likely to slip when wet, although I admit that's been tested only rarely. Can you post a photo somewhere? Just to see the size ratios, since you seem to have a achieved a setup that lasts and where the O-ring doesn't slip off. Sidewalls of "modern" bicycle tires are so flimsy that constantly running a dynamo on there is probably not good. So running it on the rim instead sounds like a good idea. This motor drive turns the idea around. http://www.velogical-engineering.com/rim-dynamo-en AFAICS it's a dynamo. But hard to say, that web site is a good example of how not to do web sites. http://www.velogical-engineering.com/felgendynamo-de-1 126 Euros for a measly 1.5W? Are they kidding? Though in their measurements it seems that it can get to about 5W at 20km/h which is a leisurely 12.5mph. Maybe more if milked via MPPT. That's sort of ok but not at 126 Euros. -- Regards, Joerg http://www.analogconsultants.com/ |
#3
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Rim drive electric motor
On 5/27/2016 3:21 PM, Joerg wrote:
On 2016-05-27 13:02, Frank Krygowski wrote: On two of my bikes, I've got bottle dynamos modified to run on the rim's braking surface. A thick O-ring "tire" mounted in the dynamo's drive wheel seems to give a much smoother drive than the usual drive via the tire's sidewall. It also seems to be less likely to slip when wet, although I admit that's been tested only rarely. Can you post a photo somewhere? Just to see the size ratios, since you seem to have a achieved a setup that lasts and where the O-ring doesn't slip off. Sidewalls of "modern" bicycle tires are so flimsy that constantly running a dynamo on there is probably not good. So running it on the rim instead sounds like a good idea. This motor drive turns the idea around. http://www.velogical-engineering.com/rim-dynamo-en AFAICS it's a dynamo. But hard to say, that web site is a good example of how not to do web sites. http://www.velogical-engineering.com/felgendynamo-de-1 126 Euros for a measly 1.5W? Are they kidding? Though in their measurements it seems that it can get to about 5W at 20km/h which is a leisurely 12.5mph. Maybe more if milked via MPPT. That's sort of ok but not at 126 Euros. Meh. In Germany a used moped (more power) starts just a bit higher than that: http://www.ebay.de/itm/Moped-Hercule...AOSwepZXRx6 7 But people like what they like. Celebrate diversity! -- Andrew Muzi www.yellowjersey.org/ Open every day since 1 April, 1971 |
#4
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Rim drive electric motor
On 2016-05-27 14:21, AMuzi wrote:
On 5/27/2016 3:21 PM, Joerg wrote: On 2016-05-27 13:02, Frank Krygowski wrote: On two of my bikes, I've got bottle dynamos modified to run on the rim's braking surface. A thick O-ring "tire" mounted in the dynamo's drive wheel seems to give a much smoother drive than the usual drive via the tire's sidewall. It also seems to be less likely to slip when wet, although I admit that's been tested only rarely. Can you post a photo somewhere? Just to see the size ratios, since you seem to have a achieved a setup that lasts and where the O-ring doesn't slip off. Sidewalls of "modern" bicycle tires are so flimsy that constantly running a dynamo on there is probably not good. So running it on the rim instead sounds like a good idea. This motor drive turns the idea around. http://www.velogical-engineering.com/rim-dynamo-en AFAICS it's a dynamo. But hard to say, that web site is a good example of how not to do web sites. http://www.velogical-engineering.com/felgendynamo-de-1 126 Euros for a measly 1.5W? Are they kidding? Though in their measurements it seems that it can get to about 5W at 20km/h which is a leisurely 12.5mph. Maybe more if milked via MPPT. That's sort of ok but not at 126 Euros. Meh. In Germany a used moped (more power) starts just a bit higher than that: http://www.ebay.de/itm/Moped-Hercule...AOSwepZXRx6 7 But people like what they like. Celebrate diversity! They actually started lower. There is also the "Mofa", short for Motorfahrrad or motorized bicycle. Those are capped at 25km/h or 15.5mph. License-free and all the rage when I went to school in Germany. Beats me why since I passed them all the time on my road bike. Had to because of the blue stench coming out of their exhaust. But nowadays they seem to be alomost extinct, everyone and their brother now has E-bikes over there. Maybe some day here as well? I just ordered a couple of bike rear lights at Newegg, for backup in case the power bus fails. It's normally a place where you buy computer stuff. The first item that popped up was a real surprise, even they have an E-Bike deal: http://www.newegg.com/Product/Produc...-045-_-Product BTW, those mofas and mopeds where a hot item for modders. Many of my class mates had a competition going over who could soup up theirs the best. One of the expert modders then realized too late that the brakes aren't adequate for going at close to freeway speeds on these little things. He ended up under a truck and died :-( -- Regards, Joerg http://www.analogconsultants.com/ |
#5
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Rim drive electric motor
Frank Krygowski wrote:
On two of my bikes, I've got bottle dynamos modified to run on the rim's braking surface. A thick O-ring "tire" mounted in the dynamo's drive wheel seems to give a much smoother drive than the usual drive via the tire's sidewall. It also seems to be less likely to slip when wet, although I admit that's been tested only rarely. This motor drive turns the idea around. http://www.velogical-engineering.com/rim-dynamo-en It pushes on only one side of the rim? How is it supposed to have enough traction to push the wheel? No way. You couldn't even use a gear to do that. |
#6
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Rim drive electric motor
On Fri, 27 May 2016 13:02:01 -0700 (PDT), Frank Krygowski
wrote: On two of my bikes, I've got bottle dynamos modified to run on the rim's braking surface. A thick O-ring "tire" mounted in the dynamo's drive wheel seems to give a much smoother drive than the usual drive via the tire's sidewall. It also seems to be less likely to slip when wet, although I admit that's been tested only rarely. This motor drive turns the idea around. http://www.velogical-engineering.com/rim-dynamo-en - Frank Krygowski Interesting. I see that the system uses two motors, one on each side of the rim, which would make a bit sturdier drive system than a single motor pressing on only one side of the wheel. I am, though, a bit skeptical of the description. They say, in the English translation, "Both engines weigh 500 grams - equivalent to 2 pieces of butter" 500 grams is about 1 pound. Does one slather a half pound of butter on one's toast :-) -- cheers, John B. |
#7
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Rim drive electric motor
On 28/05/16 00:38, Joerg wrote:
On 2016-05-27 14:21, AMuzi wrote: On 5/27/2016 3:21 PM, Joerg wrote: On 2016-05-27 13:02, Frank Krygowski wrote: On two of my bikes, I've got bottle dynamos modified to run on the rim's braking surface. A thick O-ring "tire" mounted in the dynamo's drive wheel seems to give a much smoother drive than the usual drive via the tire's sidewall. It also seems to be less likely to slip when wet, although I admit that's been tested only rarely. Can you post a photo somewhere? Just to see the size ratios, since you seem to have a achieved a setup that lasts and where the O-ring doesn't slip off. Sidewalls of "modern" bicycle tires are so flimsy that constantly running a dynamo on there is probably not good. So running it on the rim instead sounds like a good idea. This motor drive turns the idea around. http://www.velogical-engineering.com/rim-dynamo-en AFAICS it's a dynamo. But hard to say, that web site is a good example of how not to do web sites. http://www.velogical-engineering.com/felgendynamo-de-1 126 Euros for a measly 1.5W? Are they kidding? Though in their measurements it seems that it can get to about 5W at 20km/h which is a leisurely 12.5mph. Maybe more if milked via MPPT. That's sort of ok but not at 126 Euros. Meh. In Germany a used moped (more power) starts just a bit higher than that: http://www.ebay.de/itm/Moped-Hercule...AOSwepZXRx6 7 But people like what they like. Celebrate diversity! They actually started lower. There is also the "Mofa", short for Motorfahrrad or motorized bicycle. Those are capped at 25km/h or 15.5mph. License-free and all the rage when I went to school in Germany. Beats me why since I passed them all the time on my road bike. Had to because of the blue stench coming out of their exhaust. But nowadays they seem to be alomost extinct, everyone and their brother now has E-bikes over there. Maybe some day here as well? I just ordered a couple of bike rear lights at Newegg, for backup in case the power bus fails. It's normally a place where you buy computer stuff. The first item that popped up was a real surprise, even they have an E-Bike deal: You're partly right about that, I still see a few blue plate strokers around, but e-bikes are taking over. Saw my first blue plate e-bike the other day which made me wonder. http://www.newegg.com/Product/Produc...-045-_-Product BTW, those mofas and mopeds where a hot item for modders. Many of my class mates had a competition going over who could soup up theirs the best. One of the expert modders then realized too late that the brakes aren't adequate for going at close to freeway speeds on these little things. He ended up under a truck and died :-( A case of hold my beer and watch this. Sad, but happens. |
#8
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Rim drive electric motor
On 5/28/2016 2:37 AM, Tosspot wrote:
On 28/05/16 00:38, Joerg wrote: BTW, those mofas and mopeds where a hot item for modders. Many of my class mates had a competition going over who could soup up theirs the best. One of the expert modders then realized too late that the brakes aren't adequate for going at close to freeway speeds on these little things. He ended up under a truck and died :-( A case of hold my beer and watch this. Sad, but happens. In those incidents, I've always preferred to be the guy holding the beer. -- - Frank Krygowski |
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