Message-ID: <51B77A4B.9020008@iup.uni-heidelberg.de>
Date: Tue, 11 Jun 2013 21:28:11 +0200
From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= <Stefan.Schaefer@iup.uni-heidelberg.de>
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To: rsgb_lf_group@blacksheep.org
References: <9A6FD89658AF451890E8709A003D5B7A@malHP>	<51B73B97.7010100@iup.uni-heidelberg.de> <CAMFjj72L5T7C4hW=NVyOuuDFM9JB34g7v+Ps+kQD1s58RxQmjA@mail.gmail.com>
In-Reply-To: <CAMFjj72L5T7C4hW=NVyOuuDFM9JB34g7v+Ps+kQD1s58RxQmjA@mail.gmail.com>
Subject: Re: LF: DIY WIND GENERATOR
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Hi Warren, Mal, LF,

When answering to Mal about the topic, i also thought about removing the=20
rectifier, first. But then i thought this could be problematic due to=20
the wide range of frequencies which can go down to nearly DC. A mains=20
transformer could become saturated then, or needs very high numbers of=20
turns on both sides.
I think the best is to use a bridge of 6 FETs, e.g. IRFP4368=20
<https://dl.dropboxusercontent.com/u/19882028/Datenbl%C3%A4tter/IRFP4368P=
bF.pdf>=20
and a 3 phase ferrite transformer and build a suitable supply with an=20
output voltage at say 200 DC. You can then distribute the power to the=20
shack with a thin wire and us e.g. a simple normal SMPS for mains=20
applications (like a standard 13.8V DC supply from the amateur store)=20
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=20
> bridge rectifier to get d.c.
> If you could remove the bridge you could feed the A.C. into a step-up=20
> transformer for transmission at higher voltage/lower current.
>
> 73 Warren K2ORS
>
>
>
>
> On Tue, Jun 11, 2013 at 11:00 AM, Stefan Sch=E4fer=20
> <Stefan.Schaefer@iup.uni-heidelberg.de=20
> <mailto:Stefan.Schaefer@iup.uni-heidelberg.de>> wrote:
>
>     Mal,
>
>     100A?
>     What is the cable length Mal? 2x 100m, using 2,5mm^2? Or do you
>     use an inverter next to the generator output to transform up to
>     200V or so?
>
>     73, Stefan/DK7FC
>
>     Am 10.06.2013 18:04, schrieb mal hamilton:
>>     HOME BREW WIND GENERATOR 12V/100A
>>     OLD CAR HEAVY DUTY ALTERNATOR, THE REST MADE FROM SCRAP
>>     DE G3KEV
>
>
>
>
> --=20
> 73 Warren K2ORS
>                 WD2XGJ
>                 WD2XSH/23
>                 WE2XEB/2
>                 WE2XGR/1
>

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Hi Warren, Mal, LF,<br>
<br>
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.<br>
I think the best is to use a bridge of 6 FETs, e.g. <a
 href="https://dl.dropboxusercontent.com/u/19882028/Datenbl%C3%A4tter/IRFP4368PbF.pdf">IRFP4368</a>
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.<br>
Ignore the savety aspect ;-)<br>
<br>
73, Stefan/DK7FC<br>
<br>
Am 11.06.2013 17:23, schrieb Warren Ziegler:
<blockquote
 cite="mid:CAMFjj72L5T7C4hW=NVyOuuDFM9JB34g7v+Ps+kQD1s58RxQmjA@mail.gmail.com"
 type="cite">
  <div dir="ltr">Stefan, Mal,
  <div><br>
  </div>
  <div style="">&nbsp; &nbsp;Very interesting project !</div>
  <div style="">Automotive alternators are actually 3-phase ac
alternators with a bridge rectifier to get d.c.</div>
  <div style="">If you could remove the bridge you could feed the A.C.
into a step-up transformer for transmission at higher voltage/lower
current.</div>
  <div style=""><br>
  </div>
  <div style="">73 Warren K2ORS</div>
  <div style=""><br>
  </div>
  <div style=""><br>
  </div>
  </div>
  <div class="gmail_extra"><br>
  <br>
  <div class="gmail_quote">On Tue, Jun 11, 2013 at 11:00 AM, Stefan
Sch&auml;fer <span dir="ltr">&lt;<a moz-do-not-send="true"
 href="mailto:Stefan.Schaefer@iup.uni-heidelberg.de" target="_blank">Stefan.Schaefer@iup.uni-heidelberg.de</a>&gt;</span>
wrote:<br>
  <blockquote class="gmail_quote"
 style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
    <div bgcolor="#ffffff" text="#000000">
Mal, <br>
    <br>
100A?<br>
What is the cable length Mal? 2x 100m, using 2,5mm^2? Or do you use an
inverter next to the generator output to transform up to 200V or so?<br>
    <br>
73, Stefan/DK7FC<br>
    <br>
Am 10.06.2013 18:04, schrieb mal hamilton:
    <div class="im">
    <blockquote type="cite">
      <div dir="ltr">
      <div style="font-size: 12pt; font-family: 'Calibri';">
      <div>HOME BREW WIND GENERATOR 12V/100A</div>
      <div>&nbsp;</div>
      <div>OLD CAR HEAVY DUTY ALTERNATOR, THE REST MADE FROM SCRAP</div>
      <div>&nbsp;</div>
      <div>DE G3KEV</div>
      <div>&nbsp;</div>
      </div>
      </div>
    </blockquote>
    </div>
    </div>
  </blockquote>
  </div>
  <br>
  <br clear="all">
  <div><br>
  </div>
-- <br>
73 Warren K2ORS<br>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; WD2XGJ <br>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; WD2XSH/23<br>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; WE2XEB/2<br>
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; WE2XGR/1<br>
  <br>
&nbsp;
  </div>
</blockquote>
</body>
</html>

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