"print motor" servo as low speed generator??

On Fri, 24 Mar 2006 19:57:53 -0500, clare at snyder.on.ca wrote:

On Fri, 24 Mar 2006 11:46:24 -0500, clare at snyder.on.ca wrote:
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Except there is not enough gap to make the thing any thicker. And taking them apart knocks the magnetic strength into the crapper. I found out what the coil around the magnets is for. It's there for the factory to jap with mega-amp mili-second pulse to get the magnets up to strength after assembly. The "windings" on the rotor are bonded on, not etched. I have a writeup on these motors I'll post to the web in a couple of days.
OK guys, for the curious among you, I put up the artical on my web-site.
WWW.snyder.on.ca/pages/sg/How Printed Circuit electric motors work.doc

It will likely come up at something like 235% - scale it to 100% to read it properly. You'll have to cut and paste, the whole URL doesn't carry through for some reason.

It explains things pretty well, with good pictures too. *** Free account sponsored by SecureIX.com *** *** Encrypt your Internet usage with a free VPN account from http://www.SecureIX.com ***

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clare wrote:

On 23 Mar 2006 11:15:06 -0800, meow2222@care2.com wrote:
A paperboard OTOH is makeable at home, using layers of copper foil, paper and glue.
Except there is not enough gap to make the thing any thicker.

Theres no need to make it thicker. More copper means less paper.

And taking them apart knocks the magnetic strength into the crapper.

I dont see how
NT

On 26 Mar 2006 15:09:59 -0800, meow2222@care2.com wrote:

clare wrote: On 23 Mar 2006 11:15:06 -0800, meow2222@care2.com wrote:
A paperboard OTOH is makeable at home, using layers of copper foil, paper and glue.
Except there is not enough gap to make the thing any thicker.
Theres no need to make it thicker. More copper means less paper.

And there is no paper , and the fiberglass is not as thick as one conductoe, muchless 2, which would be required to add any more copper.

And taking them apart knocks the magnetic strength into the crapper.
I dont see how
NT

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clare wrote:

On 26 Mar 2006 15:09:59 -0800, meow2222@care2.com wrote:
A paperboard OTOH is makeable at home, using layers of copper foil, paper and glue.
Except there is not enough gap to make the thing any thicker.
Theres no need to make it thicker. More copper means less paper.
And there is no paper , and the fiberglass is not as thick as one conductoe, muchless 2, which would be required to add any more copper.

I guess electronics and gearing are your only options then. Or doing nothing and just not getting much from it.
There is one other outer fringes approach that could work. Its a mechanical switcher that connects to the output to one cell at a time, and moves the connection from cell to cell every so often. When there's enough V to charge one cell, theres enough V to run electronics, so in principle its possible to look at the V_out and connect to whatever number of cells it will charge at the time.
Switched mode electronics is of course easier, but will be very inefficient at lower output. And it sounds like this machine will spend a lot of its time in low output mode.
A 2 diode doubler rectifier would help, as theres only one diode V drop in the rectifier, and the smpsu pass transistor sees nearly twice the voltage, thus wastes half the percentage of power.
I suppose if you use no trnoics at all the 2 diode doubler would be sensible. It would halve the minimum rotor speed required to charge.
NT