Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mg05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 314A8380000F5; Thu, 22 Sep 2011 16:48:55 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1R6qBa-0002S7-Tx for rs_out_1@blacksheep.org; Thu, 22 Sep 2011 21:47:58 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1R6qBa-0002Ry-94 for rsgb_lf_group@blacksheep.org; Thu, 22 Sep 2011 21:47:58 +0100 Received: from rhcavuit02.kulnet.kuleuven.be ([134.58.240.130] helo=cavuit02.kulnet.kuleuven.be) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1R6qBY-0008AD-69 for rsgb_lf_group@blacksheep.org; Thu, 22 Sep 2011 21:47:58 +0100 X-KULeuven-Envelope-From: rik.strobbe@fys.kuleuven.be X-KULeuven-Scanned: Found to be clean X-KULeuven-ID: 2A19C128087.A6ACD X-KULeuven-Information: Katholieke Universiteit Leuven Received: from smtps02.kuleuven.be (smtpshost02.kulnet.kuleuven.be [134.58.240.75]) by cavuit02.kulnet.kuleuven.be (Postfix) with ESMTP id 2A19C128087 for ; Thu, 22 Sep 2011 22:47:49 +0200 (CEST) Received: from ICTS-S-HUB-N1.luna.kuleuven.be (icts-s-hub-n1.luna.kuleuven.be [10.112.9.11]) by smtps02.kuleuven.be (Postfix) with ESMTP id 07261F3862 for ; Thu, 22 Sep 2011 22:47:49 +0200 (CEST) Received: from ICTS-S-EXC2-CA.luna.kuleuven.be ([10.112.11.13]) by ICTS-S-HUB-N1.luna.kuleuven.be ([10.112.9.11]) with mapi; Thu, 22 Sep 2011 22:47:49 +0200 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: "rsgb_lf_group@blacksheep.org" Date: Thu, 22 Sep 2011 22:47:49 +0200 Thread-Topic: LF: Re: Turbine magnets Thread-Index: Acx5ZKxt5OqSvWg3SF2kacPYAkDJHwAA1mXQ Message-ID: References: <000a01cc7942$09fbef90$0401a8c0@xphd97xgq27nyf> <433A1E6B2B1A4FA895223B81346E0F1C@HughLaptop>, In-Reply-To: Accept-Language: nl-NL, nl-BE Content-Language: nl-BE X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: nl-NL, nl-BE MIME-Version: 1.0 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: RE: LF: Re: Turbine magnets Content-Type: multipart/alternative; boundary="_000_BF4A524700075746A6467658DFC7102CB0B27CF31FICTSSEXC2CAlu_" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.8 required=5.0 tests=HTML_30_40,HTML_MESSAGE, TO_ADDRESS_EQ_REAL 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-SCORE: 0:2:456399232:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d60cd4e7b9f3713c5 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none --_000_BF4A524700075746A6467658DFC7102CB0B27CF31FICTSSEXC2CAlu_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Andy, you're right, generators (and motors) keep their magnetic field "inside" fo= r the sake of efficiency. Besides that the inter-magnet force drops with the square of their distance= (assumed that the distance between the magnets is much larger than their s= ize). 73, Rik ON7YD - OR7T ________________________________ Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org= ] namens Andy Talbot [andy.g4jnt@gmail.com] Verzonden: donderdag 22 september 2011 22:15 Aan: rsgb_lf_group@blacksheep.org Onderwerp: Re: LF: Re: Turbine magnets Surely if the magnetic field leaked that much, the generators would suffer = efficiency. They are designed as closed magnetic circuits, with all the field lines clo= sely confined in iron, with small air gaps Andy 'jnt On 22 September 2011 21:07, Hugh M0WYE > wrote: Seems unlikely that the magnetism would reach that far to me - the magnetic= field would be no different to any other large generating set - they are j= ust an ordinary alternator driven through a gearbox. If they did affect magnetic compasses you would have thought that the place= you would really notice it would be around the coast, with small boats sai= ling in amongst them. Although they look as if they are turning slowly, they can't do many rpm be= fore the tips of the blades go supersonic, as the blades are many 10s of me= tres long. Over what distance did you notice the magnetic effect? perhaps I could get = down to the ones on Romney Marsh, here in Kent and see if they have any eff= ect on a compass needle. The moving blades can affect radio reception for people living nearby, alth= ough I've not noticed this myself. 73 Hugh M0WYE ----- Original Message ----- From: mal hamilton To: rsgb Sent: Thursday, September 22, 2011 5:09 PM Subject: LF: Turbine magnets Great for LF!!!!!!!!!!!!! Experience Driving to Gleneagles in Scotland last weekend my car magnetic compass was = reading backwards and erratic and I wondered why. The hills es mountain tops are covered with WIND TURBINES, hugh beasts and= only turning slowly, cannot be producing much electric. however thinking about it I have concluded that the strong MAGNETS in the t= urbines must effect a magnetic compass, possible aeroplanes as well except= they are flying very high, might also have an influence on GPS frequencies= and navigation in these areas I must say these hugh Monsters strewn all across the Scottish mountain tops= and countryside spoils the scenery. de Mal/G3KEV --_000_BF4A524700075746A6467658DFC7102CB0B27CF31FICTSSEXC2CAlu_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Andy,
 
you're right, generators (and motors)=  keep their magnetic field "inside" for the sake of efficien= cy.
Besides that the inter-magnet force d= rops with the square of their distance (assumed that the distance between t= he magnets is much larger than their size).
=  
73, Rik  ON7YD - OR7= T
 
Van: owner-rsgb_l= f_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Andy Tal= bot [andy.g4jnt@gmail.com]
Verzonden: donderdag 22 september 2011 22:15
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: Re: LF: Re: Turbine magnets

Surely if the magnetic field leaked that much, the generators would su= ffer efficiency.  
They are designed as closed magnetic circuits, with all the field line= s closely confined in iron, with small air gaps
 
Andy
'jnt


 
On 22 September 2011 21:07, Hugh M0WYE <m0wye@radiouk.com>= wrote:
Seems unlikely that the magnetism woul= d reach that far to me - the magnetic field would be no different to any ot= her large generating set - they are just an ordinary alternator driven thro= ugh a gearbox.
If they did affect magnetic compasses = you would have thought that the place you would really notice it would be a= round the coast, with small boats sailing in amongst them.
Although they look as if they are turn= ing slowly, they can't do many rpm before the tips of the blades go superso= nic, as the blades are many 10s of metres long.
Over what distance did you notice the = magnetic effect? perhaps I could get down to the ones on Romney Marsh,= here in Kent and see if they have any effect on a compass needle.
 
The moving blades can affect radio rec= eption for people living nearby, although I've not noticed this myself.
 
73
Hugh M0WYE
----- Original Message -----
To: rsgb
Sent: Thursday, September 22, 2011 5= :09 PM
Subject: LF: Turbine magnets

Great for LF!!!!!!!!!!!!!
 
Experience
 
Driving to Gleneagles in Scotland last weekend my= car magnetic compass was reading backwards and erratic and I wondered why.=
The hills es mountain tops are covered with WIND = TURBINES,  hugh beasts and only turning slowly, cannot be producing mu= ch electric.
however thinking about it I have concluded that t= he strong MAGNETS in the turbines must effect a magnetic com= pass,  possible aeroplanes as well except they are flying very hi= gh, might also have an influence on GPS frequencies and navigation in these areas
I must say these hugh Monsters strewn all across = the Scottish mountain tops and countryside spoils the scenery.<= /div>
 de Mal/G3KEV
 

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