Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dh02.r1000.mx.aol.com (Internet Inbound) with ESMTP id 2551D380000BE; Tue, 11 Jun 2013 18:19:57 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1UmWtv-0002S3-CC for rs_out_1@blacksheep.org; Tue, 11 Jun 2013 23:18:51 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1UmWtu-0002Ru-Qs for rsgb_lf_group@blacksheep.org; Tue, 11 Jun 2013 23:18:50 +0100 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1UmWts-0004Az-Dj for rsgb_lf_group@blacksheep.org; Tue, 11 Jun 2013 23:18:49 +0100 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id r5BMIlHr017557 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 12 Jun 2013 00:18:47 +0200 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id r5BMIkq6026536 for ; Wed, 12 Jun 2013 00:18:46 +0200 Message-ID: <51B7A240.5010106@iup.uni-heidelberg.de> Date: Wed, 12 Jun 2013 00:18:40 +0200 From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <9A6FD89658AF451890E8709A003D5B7A@malHP> <51B73B97.7010100@iup.uni-heidelberg.de> <51B77A4B.9020008@iup.uni-heidelberg.de> <86AD6A9E30DC4F3CA71C2117945A21BA@White> In-Reply-To: <86AD6A9E30DC4F3CA71C2117945A21BA@White> X-Spam-Score: -0.9 (/) 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: 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. [...] Content analysis details: (-0.9 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [129.206.100.212 listed in list.dnswl.org] -0.2 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message X-Scan-Signature: 86a33fe05fd4c52b025518dbd249b8c0 Subject: Re: LF: DIY WIND GENERATOR Content-Type: multipart/alternative; boundary="------------080403010702060301090008" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_20_30,HTML_MESSAGE 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-sid: 3039ac1d411651b7a28c680c X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none This is a multi-part message in MIME format. --------------080403010702060301090008 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by relay.uni-heidelberg.de id r5BMIlHr017557 Markus, Genial! Do it!!! :-) If your E-bike feeds back the energy to the battery (when driving down a=20 hill), you may even use the generator, battery and inverter of the bike=20 for the job. What is the rated voltage of the battery? Should be easy to build a PA=20 for 36V or so. 73, Stefan PS: I think the EMC issues of the design which was described below is=20 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,=20 > otherwise you won't be able to hear Christian on 136.5 CW ;-) You may=20 > end up with a choice between either "clean but heavy" (low frequency=20 > iron transformer), or "elegant light but dirty" (SMPS). > Wondering about Eddies remark on the rpm mismatch between propeller=20 > and alternator - what would be the optimum frequency range for either=20 > side? I do have a three-phase direct-drive bicycle motor which should=20 > be good for 400 W at relatively low speed - perhaps better suited?=20 > It's relatively heavy, about 4.5 kg of iron, neodymium, copper and=20 > aluminium. > Wind power would seem the ideal complement to kite transmit=20 > activity... I've been pondering about extracting it from the kite=20 > itself but that idea is not new at all, just google for "kite energy",=20 > eg. http://www.enerkite.com/ . > The plan is to have the ebike pull myself and the equipment onto some=20 > hilltop. Then mount wind blades onto the front wheel, and get the kite=20 > up for a three-hour VLF dash while topping up the battery on the side.=20 > Then roll downhill and come home with the fully charged battery ready=20 > for tomorrow ;-) > Best 73, > Markus (DF6NM) > > *From:* Stefan Sch=E4fer > *Sent:* Tuesday, June 11, 2013 9:28 PM > *To:* rsgb_lf_group@blacksheep.org > *Subject:* Re: LF: DIY WIND GENERATOR > > Hi Warren, Mal, LF, > > When answering to Mal about the topic, i also thought about removing=20 > the rectifier, first. But then i thought this could be problematic due=20 > to the wide range of frequencies which can go down to nearly DC. A=20 > mains transformer could become saturated then, or needs very high=20 > numbers of turns on both sides. > I think the best is to use a bridge of 6 FETs, e.g. IRFP4368=20 > =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 --------------080403010702060301090008 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit 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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