Return-Path: Received: from rwcrmhc13.comcast.net ([204.127.198.39] verified) by logan.com (CommuniGate Pro SMTP 4.1.5) with ESMTP id 2628972 for flyrotary@lancaironline.net; Wed, 08 Oct 2003 14:45:05 -0400 Received: from rv8 (12-225-206-211.client.attbi.com[12.225.206.211]) by comcast.net (rwcrmhc13) with SMTP id <2003100818445901500khmfpe>; Wed, 8 Oct 2003 18:44:59 +0000 Message-ID: <014a01c38dcc$459826f0$d3cee10c@rv8> From: "kevin lane" To: "Rotary motors in aircraft" References: Subject: overvoltage? Date: Wed, 8 Oct 2003 11:44:54 -0700 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 someone explain to me why overvoltage is needed for a permanent magnet alternator. I thought they would be incapable of overvoltage since the magnetic field is fixed. Kevin Lane Portland, OR e-mail-> n3773@comcast.net web-> http://home.comcast.net/~n3773 (browse w/ internet explorer) ----- Original Message ----- From: "David Carter" To: "Rotary motors in aircraft" Sent: Wednesday, October 01, 2003 11:23 AM Subject: [FlyRotary] PM Alternators was Re: [FlyRotary] Re: alternator choice? > Here's a summary of John Deere PM alternators: > > Output Amps Alternator P/N Regulator P/N Weight LBS > Remarks > > 20 AM877557 AM101406 4 > 35 AM877957 AM101406 4 ? > Same device, with internal changes, Uses same Regulator > > 55 AL81436 AL65077 > ? Flat pack on back of alternator body Typically > used on 6400L and 6500L Tractor, for running at night with lights. > 85 AL81437 AL65077 > ? Has Overvoltage protection, same P/N as 55amp > 85 AL78690 ? > Listed for 6400 series tractor, NO overvoltage protection > > David Carter > > ----- Original Message ----- > From: "Marko Bewersdorff" > To: "Rotary motors in aircraft" > Sent: Wednesday, October 01, 2003 12:07 PM > Subject: [FlyRotary] Re: alternator choice? > > > > I have one of those permanent magnet deals on my Vari Eze, sold by B&C for > > $$$ I keep hearing that they are of a Kubota tractor. Mine is only rated > at > > 14 A or there abouts so my night IFR is kinda like Apolo 13's return to > > earth - don't need strobes - don't need the VOR for a little while, etc. > > etc. > > > > Marko > > > > > -----Original Message----- > > > From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On > > > Behalf Of Lehanover@aol.com > > > > > > I saw a permanent magnet alternator on a formula Atlantic car and > > > was told it > > > was rated at 20 amps. It was from a big garden tractor of some > > > kind. Smaller > > > than your fist. Running off of a 1/4" wide V belt. > > > > > > Lynn E. Hanover > > > > > > > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html >