Batteryless bicycle safety lights. (New Generation) - Page 3 - Cycling Mob: Road Cycling, Mountain Biking and More

01-05-2005, 01:06 PM

Ray Heindl wrote:

>"Leo Lichtman" <[Only registered and activated users can see links. ].net> wrote:
>
>
>>Looking at the diagram of the generator, it appears that a magnet
>>on the spokes sweeps over a "tumbling magnet", which, in turn,
>>generates current in a surrounding coil. Why didn't the designer
>>simply let the field from the spoke magnet do the generating?
>>
>>
>
>If the magnet on the spoke is passing slowly it won't generate much
>current. But it will cause the tumbling magnet to flip rapidly,
>generating a current pulse. During slow rotation it stores energy in
>the field between the two magnets, then releases it rapidly when the
>magnet flips. A clever idea.
>
>

for slower speeds, if you have more than one spoke magnets, for each
rotation of the wheel, there will more flip-overs of the magnet inside
the generator.

+ravi

01-05-2005, 01:20 PM

On Wed, 05 Jan 2005 13:06:30 -0800, Ravi <[Only registered and activated users can see links. ]> wrote:

>Ray Heindl wrote:
>
>>"Leo Lichtman" <[Only registered and activated users can see links. ].net> wrote:
>>
>>
>>>Looking at the diagram of the generator, it appears that a magnet
>>>on the spokes sweeps over a "tumbling magnet", which, in turn,
>>>generates current in a surrounding coil. Why didn't the designer
>>>simply let the field from the spoke magnet do the generating?
>>>
>>>
>>
>>If the magnet on the spoke is passing slowly it won't generate much
>>current. But it will cause the tumbling magnet to flip rapidly,
>>generating a current pulse. During slow rotation it stores energy in
>>the field between the two magnets, then releases it rapidly when the
>>magnet flips. A clever idea.
>>
>>
>
>for slower speeds, if you have more than one spoke magnets, for each
>rotation of the wheel, there will more flip-overs of the magnet inside
>the generator.
>
>+ravi

So we agree that this is a pretty clever idea? Not very expensive
although fairly primitive looking. Probably get stolen off my bike
with a week.

01-05-2005, 01:20 PM

On Wed, 05 Jan 2005 13:06:30 -0800, Ravi <[Only registered and activated users can see links. ]> wrote:

>Ray Heindl wrote:
>
>>"Leo Lichtman" <[Only registered and activated users can see links. ].net> wrote:
>>
>>
>>>Looking at the diagram of the generator, it appears that a magnet
>>>on the spokes sweeps over a "tumbling magnet", which, in turn,
>>>generates current in a surrounding coil. Why didn't the designer
>>>simply let the field from the spoke magnet do the generating?
>>>
>>>
>>
>>If the magnet on the spoke is passing slowly it won't generate much
>>current. But it will cause the tumbling magnet to flip rapidly,
>>generating a current pulse. During slow rotation it stores energy in
>>the field between the two magnets, then releases it rapidly when the
>>magnet flips. A clever idea.
>>
>>
>
>for slower speeds, if you have more than one spoke magnets, for each
>rotation of the wheel, there will more flip-overs of the magnet inside
>the generator.
>
>+ravi

So we agree that this is a pretty clever idea? Not very expensive
although fairly primitive looking. Probably get stolen off my bike
with a week.

01-05-2005, 01:20 PM

On Wed, 05 Jan 2005 13:06:30 -0800, Ravi <[Only registered and activated users can see links. ]> wrote:

>Ray Heindl wrote:
>
>>"Leo Lichtman" <[Only registered and activated users can see links. ].net> wrote:
>>
>>
>>>Looking at the diagram of the generator, it appears that a magnet
>>>on the spokes sweeps over a "tumbling magnet", which, in turn,
>>>generates current in a surrounding coil. Why didn't the designer
>>>simply let the field from the spoke magnet do the generating?
>>>
>>>
>>
>>If the magnet on the spoke is passing slowly it won't generate much
>>current. But it will cause the tumbling magnet to flip rapidly,
>>generating a current pulse. During slow rotation it stores energy in
>>the field between the two magnets, then releases it rapidly when the
>>magnet flips. A clever idea.
>>
>>
>
>for slower speeds, if you have more than one spoke magnets, for each
>rotation of the wheel, there will more flip-overs of the magnet inside
>the generator.
>
>+ravi

So we agree that this is a pretty clever idea? Not very expensive
although fairly primitive looking. Probably get stolen off my bike
with a week.

01-05-2005, 01:20 PM

On Wed, 05 Jan 2005 13:06:30 -0800, Ravi <[Only registered and activated users can see links. ]> wrote:

>Ray Heindl wrote:
>
>>"Leo Lichtman" <[Only registered and activated users can see links. ].net> wrote:
>>
>>
>>>Looking at the diagram of the generator, it appears that a magnet
>>>on the spokes sweeps over a "tumbling magnet", which, in turn,
>>>generates current in a surrounding coil. Why didn't the designer
>>>simply let the field from the spoke magnet do the generating?
>>>
>>>
>>
>>If the magnet on the spoke is passing slowly it won't generate much
>>current. But it will cause the tumbling magnet to flip rapidly,
>>generating a current pulse. During slow rotation it stores energy in
>>the field between the two magnets, then releases it rapidly when the
>>magnet flips. A clever idea.
>>
>>
>
>for slower speeds, if you have more than one spoke magnets, for each
>rotation of the wheel, there will more flip-overs of the magnet inside
>the generator.
>
>+ravi

So we agree that this is a pretty clever idea? Not very expensive
although fairly primitive looking. Probably get stolen off my bike
with a week.

01-05-2005, 07:48 PM

botfood wrote:
> it takes almost nothing to flash LEDs... looks at the piezoelectric
> flashers on kids shoes! Note however that this solution does not light
> your path, just provides visibility for cars to see you...

Every day, drivers claim they "didn't see" another motor vehicle coming at
them with a pair of 150,000 candlepower headlights. It's a bit naive to
think they are going to see a few flashing LED's of a few candlepower each.

Austin
--
I'm pedaling as fast as I durn well please!
There are no X characters in my address

01-05-2005, 07:48 PM

botfood wrote:
> it takes almost nothing to flash LEDs... looks at the piezoelectric
> flashers on kids shoes! Note however that this solution does not light
> your path, just provides visibility for cars to see you...

Every day, drivers claim they "didn't see" another motor vehicle coming at
them with a pair of 150,000 candlepower headlights. It's a bit naive to
think they are going to see a few flashing LED's of a few candlepower each.

Austin
--
I'm pedaling as fast as I durn well please!
There are no X characters in my address

01-05-2005, 07:48 PM

botfood wrote:
> it takes almost nothing to flash LEDs... looks at the piezoelectric
> flashers on kids shoes! Note however that this solution does not light
> your path, just provides visibility for cars to see you...

Every day, drivers claim they "didn't see" another motor vehicle coming at
them with a pair of 150,000 candlepower headlights. It's a bit naive to
think they are going to see a few flashing LED's of a few candlepower each.

Austin
--
I'm pedaling as fast as I durn well please!
There are no X characters in my address

01-05-2005, 07:48 PM

botfood wrote:
> it takes almost nothing to flash LEDs... looks at the piezoelectric
> flashers on kids shoes! Note however that this solution does not light
> your path, just provides visibility for cars to see you...

Every day, drivers claim they "didn't see" another motor vehicle coming at
them with a pair of 150,000 candlepower headlights. It's a bit naive to
think they are going to see a few flashing LED's of a few candlepower each.

Austin
--
I'm pedaling as fast as I durn well please!
There are no X characters in my address

01-13-2005, 03:54 PM

well, people say what they want to make an excuse in an accident... a
blinking LED is pretty darn eye-catching though. the red flashers seem
to be far more noticible than a steady light. Even better are ones on
your pant-leg or reflective tape on shoes, as the up and down motion is
unusual and catches the eye.

d