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I have a question but it might be a little off topic.  Doesn't the number of poles of a generator increase its efficiency?  Increase it in the sense that 1 rotation can produce x times more than a generator with less poles.  So the output voltage is higher - I'm talking conventional here.  But I believe they typically limit the poles because it makes the size of the generator bigger and more expensive to construct - right?

HERE IS A GOOD ARTICLE FOR YA...
http://www.windpower.org/en/tour/wtrb/stator.htm

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Seriously though, could it be possible (just possible) or does more work need to be done?  Just a yes or no answer would do. 

Thanks,
Charlie

MORE WORK ALWAYS HAS TO BE DONE...

T

Quote from: PaulLowrance on December 13, 2008, 12:55:46 AM
The official AVG website -->

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Be careful about downloading files except from the official website.

PL

This is true
But in this case, I have explained the reason behind listing the filehippo site as a mirror. This specific site is safe, fast, and very useful.

If anyone gets a laminated core price quote from ToroidTech, http://www.toroidtech.com, then by all means please post it.

Many thanks,
PL

Quote from: TheBuzz on December 13, 2008, 05:16:48 AM
Nice... You just gave me a boner. In a purely technical sense of course. Can't wait to see the video.

HERE IS THE NEW - OLD BI-TOROID VIDEO, JUST FOR FUN:
http://www.youtube.com/watch?v=WP7zmk1t2gI&feature=channel_page

CHEERS
T

Quote from: CRANKYpants on December 13, 2008, 10:27:29 PM
HERE IS THE NEW - OLD BI-TOROID VIDEO, JUST FOR FUN:
http://www.youtube.com/watch?v=WP7zmk1t2gI&feature=channel_page

CHEERS
T

Hi Thane,

Thanks for showing this video and returning to this toroid transformator topic. I understand what you say but there is one thing I cannot get.  You say the followings in the video at 2:52 :
"... now we are producing approximately a little over 1 Amp to a 1k load."    

If you really say this (sorry if not, English is my second language), then you must have a little over 30 milliAmper to the 1k load, once the voltmeter shows the (hopefully) true RMS voltage value of 30.8V across the 1 kOhm  load resistor. 

I also understand the significance of this transformer setup that the primary input power seems to get reduced when you increase the output voltage (hence the output power) at the secondary, though here I would have a suggestion. 

I assume you use a variac transformer plugged into yours mains and the variac's output drives your toroid primary coil, is that right? 

If yes,  may I suggest using a conventional mains down transformer of say 30-40 VA (or higher) power capability between the variac and your toroid primary coil input.
Virtually any mains transformer with 3-24V secondary voltage and with 30-40 VA power capabilty would be good.
This way you could drive the toroid primary directly (and at a low impedance level) from the secondary coil of the mains transformer and the variac could drive the primary coil of the inserted mains transformer.

The advantage would be that you do not have to use the variac's wiper at its very bottom, where it can already get uncertain contact, turned almost to the fully down position area where a very small knob turn already means some volts jumping all of a sudden, instead, the variac could work in its upper range, giving plenty of fine voltage adjustment appearing at the main transformer secondary output.

Of course this is a suggestion.

Regards,
Gyula