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Re: LF: DIY WIND GENERATOR

To: [email protected]
Subject: Re: LF: DIY WIND GENERATOR
From: Stefan Schäfer <[email protected]>
Date: Wed, 12 Jun 2013 00:18:40 +0200
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Markus,

Genial! Do it!!! :-)

If your E-bike feeds back the energy to the battery (when driving down a hill), you may even use the generator, battery and inverter of the bike for the job.
What is the rated voltage of the battery? Should be easy to build a PA for 36V or so.

73, Stefan

PS: I think the EMC issues of the design which was described below is not a real problem.

Am 12.06.2013 00:02, schrieb Markus Vester:
Hi Mal, Stefan,
 
... but you'd want to filter and shield that inverter carefully, otherwise you won't be able to hear Christian on 136.5 CW ;-) You may end up with a choice between either "clean but heavy" (low frequency iron transformer), or "elegant light but dirty" (SMPS).
 
Wondering about Eddies remark on the rpm mismatch between propeller and alternator - what would be the optimum frequency range for either side? I do have a three-phase direct-drive bicycle motor which should be good for 400 W at relatively low speed - perhaps better suited? It's relatively heavy, about 4.5 kg of iron, neodymium, copper and aluminium.
 
Wind power would seem the ideal complement to kite transmit activity... I've been pondering about extracting it from the kite itself but that idea is not new at all, just google for "kite energy", eg. http://www.enerkite.com/ .
 
The plan is to have the ebike pull myself and the equipment onto some hilltop. Then mount wind blades onto the front wheel, and get the kite up for a three-hour VLF dash while topping up the battery on the side. Then roll downhill and come home with the fully charged battery ready for tomorrow ;-)
 
Best 73,
Markus (DF6NM)
 
 

Sent: Tuesday, June 11, 2013 9:28 PM
Subject: Re: LF: DIY WIND GENERATOR

Hi Warren, Mal, LF,

When answering to Mal about the topic, i also thought about removing the rectifier, first. But then i thought this could be problematic due to the wide range of frequencies which can go down to nearly DC. A mains transformer could become saturated then, or needs very high numbers of turns on both sides.
I think the best is to use a bridge of 6 FETs, e.g. IRFP4368 and a 3 phase ferrite transformer and build a suitable supply with an output voltage at say 200 DC. You can then distribute the power to the shack with a thin wire and us e.g. a simple normal SMPS for mains applications (like a standard 13.8V DC supply from the amateur store) and feed it with that 200V DC voltage.
Ignore the savety aspect ;-)

73, Stefan/DK7FC
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