Where is that generator?

On 11 Oct 2004 14:47:11 -0700, [email hidden] (Lewis

Campbell) said:

I recently read a message that contained a link to a Swiss made
generator.

Apparently, this has virtually no rolling resistance, an internal
voltage regulator and put out a 'constant' voltage of about 6.2 volts.

It seems that I have put the link in such a secret place that even _I_
cannot find it.

If someone here could send me that link, I would really appreciate it.

Thanks.

Lewis.

****************************

Dear Lewis,

Possibly this?

http://groups.google.com/groups?q=generator+volts+6.2&hl=en&lr=&group=rec.bicycles.tech&scoring=d&selm=040419990021170961%25timmcn%40minn.net&rnum=2

or

http://tinyurl.com/5nmhv

Carl Fogel

Quoted message said:

Dear Lewis,

Possibly this?

http://groups.google.com/groups?q=generator+volts+6.2&hl=en&lr=&group=rec.bicycles.tech&scoring=d&selm=040419990021170961%25timmcn%40minn.net&rnum=2

Quoted message said:

or

http://tinyurl.com/5nmhv

Carl Fogel

Or more probably http://www.dynosys-ag.ch/ without the extra d. Terry

[email hidden] (Lewis Campbell) wrote in message news:<[email hidden]>...

Quoted message said:

I recently read a message that contained a link to a Swiss made
generator.

Apparently, this has virtually no rolling resistance, an internal
voltage regulator and put out a 'constant' voltage of about 6.2 volts.

It seems that I have put the link in such a secret place that even _I_
cannot find it.

If someone here could send me that link, I would really appreciate it.

Thanks.

Lewis.

****************************

I appreciate the help, gentlemen, this is just what I was trying to find:-

http://www.dynosys-ag.ch/

It really sounds like a great generator.

Many thanks.

Lewis.

************************

Lewis Campbell said:

Quoted message said:

I recently read a message that contained a link to a Swiss made
generator.
Apparently, this has virtually no rolling resistance, an internal
voltage regulator and put out a 'constant' voltage of about 6.2 volts.
It seems that I have put the link in such a secret place that even _I_
cannot find it.
If someone here could send me that link, I would really appreciate it.

I appreciate the help, gentlemen, this is just what I was trying to find:-
http://www.dynosys-ag.ch/
It really sounds like a great generator.

It WAS. Production is closed indefinitely. 'Lights out', as
it were.

--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

A Muzi said:

Lewis Campbell wrote:

Quoted message said:

Quoted message said:

Quoted message said:

I recently read a message that contained a link to a Swiss made
generator.
Apparently, this has virtually no rolling resistance, an internal
voltage regulator and put out a 'constant' voltage of about 6.2
volts. It seems that I have put the link in such a secret place
that even _I_ cannot find it.
If someone here could send me that link, I would really appreciate
it.

I appreciate the help, gentlemen, this is just what I was trying to
find:- http://www.dynosys-ag.ch/
It really sounds like a great generator.

It WAS. Production is closed indefinitely. 'Lights out', as
it were.

Voltage regulators are available for bike light applications. Willie Hunt, who
posts regularly on the Bikecurrent mailing list, makes and sells them. So you
could cobble together your own rig that does essentially the same thing.

No generator has zero resistance. The energy to turn it has to come from
somewhere. But the best ones (hub generators) are over 60% efficient, which
means they're drawing less than 5-6W from your legs -- barely noticeable.

Generators are neato, but battery systems always work out a lot cheaper for me.

Matt O.

Matt O'Toole said:

Voltage regulators are available for bike light applications. Willie Hunt, who
posts regularly on the Bikecurrent mailing list, makes and sells them. So you
could cobble together your own rig that does essentially the same thing.

ISTR that Willie Hunt's units are switching regulators intended for
DC-DC use. Do they work with the AC output of a bike generator? Does
the inductance of the generator coils bother them?

--
Frank Krygowski [To reply, remove rodent and vegetable dot com.
Substitute cc dot ysu dot
edu]

Frank Krygowski said:

Quoted message said:

Voltage regulators are available for bike light applications.
Willie Hunt, who posts regularly on the Bikecurrent mailing list,
makes and sells them. So you could cobble together your own rig
that does essentially the same thing.

Quoted message said:

ISTR that Willie Hunt's units are switching regulators intended for
DC-DC use.

Indeed they are, for use with batteries.

Quoted message said:

Do they work with the AC output of a bike generator?

I guess they would if you converted it to DC!.

Quoted message said:

Does
the inductance of the generator coils bother them?

Don't know.

Matt O.

Matt O'Toole said:

Frank Krygowski said:

Quoted message said:

Voltage regulators are available for bike light applications.
Willie Hunt, who posts regularly on the Bikecurrent mailing list,
makes and sells them. So you could cobble together your own rig
that does essentially the same thing.

Quoted message said:

ISTR that Willie Hunt's units are switching regulators intended for
DC-DC use.

Indeed they are, for use with batteries.

Quoted message said:

Do they work with the AC output of a bike generator?

I guess they would if you converted it to DC!.

Quoted message said:

Does
the inductance of the generator coils bother them?

Don't know.

Here's what I'm wondering - as a non-electrical guy:

If I understand correctly, switching regulators like Willie Hunt's work
by turning the voltage on and off very quickly, so the RMS output is at
the desired level. (Willie Hunt's regulators feature very high
efficiency, so little energy is wasted.)

At the very least, it seems you'd have to rectify the generator's AC to
feed into that regulator. This would involve some loss of efficiency.

But would the rapid switching off of the inductive circuit generate a
voltage surge as the magnetic field collapses? Would this fry the
electronics?

I suppose a related question is: Does anyone know the particulars about
that Lightspin generator and its voltage regulation - the generator that
started this thread?

--
Frank Krygowski [To reply, remove rodent and vegetable dot com.
Substitute cc dot ysu dot
edu]

Frank Krygowski said:

I suppose a related question is: Does anyone know the particulars about
that Lightspin generator and its voltage regulation - the generator that
started this thread?

Quoted message said:

if you manage with german:

http://www.enhydralutris.de/Fahrrad/index.html#beleuchtung, it's in the
Gebetsmuehle

--
---
Marten Gerritsen

INFOapestaartjeM-GINEERINGpuntNL
www.m-gineering.nl

Frank Krygowski said:

I suppose a related question is: Does anyone know the particulars about
that Lightspin generator and its voltage regulation - the generator that
started this thread?

Here:
http://www.yellowjersey.org/litespin.html

The small diode bridge from a computer power supply is a
quick way to get DC from a LightSPIN.

But , again, LightSPIN have suspended production indefinitely

--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

Frank Krygowski said:

Here's what I'm wondering - as a non-electrical guy:

If I understand correctly, switching regulators like Willie Hunt's
work by turning the voltage on and off very quickly, so the RMS
output is at the desired level. (Willie Hunt's regulators feature
very high efficiency, so little energy is wasted.)

At the very least, it seems you'd have to rectify the generator's AC
to feed into that regulator. This would involve some loss of
efficiency.

Yes, but probably not much. It might even increase overall system efficiency,
if used carefully with the right combination of generator and bulb.

Quoted message said:

But would the rapid switching off of the inductive circuit generate a
voltage surge as the magnetic field collapses? Would this fry the
electronics?

No. The pulses of a PWM regulator have no different effect than AC pulses. The
difference is that AC produces a sine wave, while a PWM regulator produces a
square one, all on the positive side. There's no surge, just a very well
controlled wave.

Quoted message said:

I suppose a related question is: Does anyone know the particulars
about that Lightspin generator and its voltage regulation - the
generator that started this thread?

I wonder too. I also wonder how it compares to others, efficiency-wise
(pedaling power consumed per light output).

Matt O.