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

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/

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

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/

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.

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.

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.

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