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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
Am
11.06.2013 17:23, schrieb Warren Ziegler:
Stefan, Mal,
Very interesting project !
Automotive alternators are actually 3-phase ac alternators with a bridge
rectifier to get d.c.
If you could remove the bridge you could feed the A.C. into a step-up
transformer for transmission at higher voltage/lower current.
73 Warren K2ORS
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