Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dg03.r1000.mx.aol.com (Internet Inbound) with ESMTP id EF66338000092; Tue, 11 Jun 2013 18:03:33 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1UmWeC-0002D7-05 for rs_out_1@blacksheep.org; Tue, 11 Jun 2013 23:02:36 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1UmWeB-0002Cy-DQ for rsgb_lf_group@blacksheep.org; Tue, 11 Jun 2013 23:02:35 +0100 Received: from omr-d09.mx.aol.com ([205.188.108.133]) by relay1.thorcom.net with esmtp (Exim 4.77) (envelope-from ) id 1UmWe8-00045k-SG for rsgb_lf_group@blacksheep.org; Tue, 11 Jun 2013 23:02:34 +0100 Received: from mtaout-da06.r1000.mx.aol.com (mtaout-da06.r1000.mx.aol.com [172.29.51.134]) by omr-d09.mx.aol.com (Outbound Mail Relay) with ESMTP id 23B277006D066 for ; Tue, 11 Jun 2013 18:02:31 -0400 (EDT) Received: from White (188-195-246-26-dynip.superkabel.de [188.195.246.26]) by mtaout-da06.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id 9EFF6E0000B3 for ; Tue, 11 Jun 2013 18:02:27 -0400 (EDT) Message-ID: <86AD6A9E30DC4F3CA71C2117945A21BA@White> From: "Markus Vester" To: References: <9A6FD89658AF451890E8709A003D5B7A@malHP> <51B73B97.7010100@iup.uni-heidelberg.de> <51B77A4B.9020008@iup.uni-heidelberg.de> Date: Wed, 12 Jun 2013 00:02:24 +0200 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 12.0.1606 X-MimeOLE: Produced By Microsoft MimeOLE V12.0.1606 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20121107; t=1370988151; bh=A1IN4uPcr0gDAUoCgCo8dCjaI3mdKk+U80+xYDjb0oM=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=P0f3OxKSea0wF4norOmpxDG0+T14DTkl2nD1av8CoJev7j/TAlXjianneFAXmXlFv 3SKmPGxNDf2ZdWPyIOCQfktHSD2yA9LrmW4+XH9cBEPiaar5xlslwysSKtdQpXz6eE OSJ4hAxv7g2SOKJJyFhSm7VcvVZL3HQ708ulSkcg= X-AOL-SCOLL-SCORE: 1:2:418790944:93952408 X-AOL-SCOLL-URL_COUNT: 1 X-Spam-Score: -0.2 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: 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). [...] Content analysis details: (-0.2 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [205.188.108.133 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (markusvester[at]aol.com) -0.0 SPF_PASS SPF: sender matches SPF record -0.2 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: df2e2c1e83972f6e42eeb17d78e70347 Subject: Re: LF: DIY WIND GENERATOR Content-Type: multipart/alternative; boundary="----=_NextPart_000_0018_01CE6700.1E50DD40" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=HTML_30_40,HTML_MESSAGE, MISSING_OUTLOOK_NAME autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false x-aol-global-disposition: G X-AOL-SCOLL-AUTHENTICATION: mtain-dg03.r1000.mx.aol.com ; domain : mx.aol.com DKIM : pass x-aol-sid: 3039ac1d410b51b79eb558b8 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Dies ist eine mehrteilige Nachricht im MIME-Format. ------=_NextPart_000_0018_01CE6700.1E50DD40 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 ;-)=20 Best 73, Markus (DF6NM) From: Stefan Sch=E4fer=20 Sent: Tuesday, June 11, 2013 9:28 PM To: rsgb_lf_group@blacksheep.org=20 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:=20 Stefan, Mal,=20 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 On Tue, Jun 11, 2013 at 11:00 AM, Stefan Sch=E4fer = wrote: Mal,=20 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:=20 HOME BREW WIND GENERATOR 12V/100A OLD CAR HEAVY DUTY ALTERNATOR, THE REST MADE FROM SCRAP DE G3KEV --=20 73 Warren K2ORS WD2XGJ=20 WD2XSH/23 WE2XEB/2 WE2XGR/1 ------=_NextPart_000_0018_01CE6700.1E50DD40 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi Mal, Stefan,
 
... but you'd want to filter and shield = that=20 inverter carefully, otherwise you won't be able to hear Christian on = 136.5 CW=20 ;-) You may end up with a choice between either "clean but heavy" = (low=20 frequency iron transformer), or "elegant light but dirty"=20 (SMPS).
 
Wondering about Eddies remark on the = rpm mismatch=20 between propeller and alternator - what would be the optimum = frequency=20 range for either side? I do have a three-phase direct-drive bicycle = motor which=20 should be good for 400 W at relatively low speed - perhaps better = suited? It's=20 relatively heavy, about 4.5 kg of iron, neodymium, copper and=20 aluminium.
 
Wind power would seem the ideal = complement to=20 kite transmit activity... I've been pondering about extracting it = from the=20 kite itself but that idea is not new at all, just google for "kite = energy", eg.=20 http://www.enerkite.com/ = .
 
The plan is to have the ebike pull myself and the = equipment=20 onto some hilltop. Then mount wind blades onto the front = wheel, and=20 get the kite up for a three-hour VLF dash while topping = up the=20 battery on the side. Then roll downhill and come home with = the fully=20 charged battery ready for tomorrow ;-)
 
Best 73,
Markus (DF6NM)
 
 

From: Stefan = Sch=E4fer
Sent: Tuesday, June 11, 2013 9:28 PM
To: rsgb_lf_group@blacksheep.org= =20
Subject: Re: LF: DIY WIND GENERATOR

Hi=20 Warren, Mal, LF,

When answering to Mal about the topic, i also = thought=20 about removing the rectifier, first. But then i thought this could be=20 problematic due to the wide range of frequencies which can go down to = nearly DC.=20 A mains 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 and a 3 phase ferrite transformer and build a suitable supply with an = output=20 voltage at say 200 DC. You can then distribute the power to the shack = with a=20 thin wire and us e.g. a simple normal SMPS for mains applications (like = a=20 standard 13.8V DC supply from the amateur store) and feed it with that = 200V DC=20 voltage.
Ignore the savety aspect ;-)

73, = Stefan/DK7FC

Am=20 11.06.2013 17:23, schrieb Warren Ziegler:=20
Stefan, Mal,=20

   Very interesting project !
Automotive alternators are actually 3-phase ac alternators with a = bridge=20 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 <Stefan.Schaefer@iup.uni-heidelberg.de>=20 wrote:
Mal,

100A?
What = is the=20 cable length Mal? 2x 100m, using 2,5mm^2? Or do you use an inverter = next to=20 the generator output to transform up to 200V or so?

73,=20 Stefan/DK7FC

Am 10.06.2013 18:04, schrieb mal hamilton:=20
HOME BREW WIND GENERATOR 12V/100A
 
OLD CAR HEAVY DUTY ALTERNATOR, THE REST MADE FROM SCRAP
 
DE G3KEV
=
 
=

--
73 Warren K2ORS
    =    =20         WD2XGJ
        =  =20       WD2XSH/23
          =  =20     WE2XEB/2
            =  =20   WE2XGR/1

 
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