Return-Path: Received: from ns5.rokland.us ([67.15.10.31] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP-TLS id 520818 for flyrotary@lancaironline.net; Sat, 06 Nov 2004 15:59:46 -0500 Received-SPF: none receiver=logan.com; client-ip=67.15.10.31; envelope-from=bob@bob-white.com Received: from bgp01386220bgs.brodwy01.nm.comcast.net ([68.35.160.74] helo=localhost) by ns5.rokland.us with smtp (Exim 4.43) id 1CQXeX-0008LQ-4D for flyrotary@lancaironline.net; Sat, 06 Nov 2004 14:59:17 -0600 Date: Sat, 6 Nov 2004 13:59:15 -0700 From: Bob White To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] PM alternator/generator with EWP Message-Id: <20041106135915.25ebc92d.bob@bob-white.com> In-Reply-To: References: X-Mailer: Sylpheed version 1.0.0beta1 (GTK+ 1.2.10; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Antivirus-Scanner: Clean mail though you should still use an Antivirus X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - ns5.rokland.us X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - bob-white.com X-Source: X-Source-Args: X-Source-Dir: How about a thermocouple array on the exhaust system. There's 1700 degrees there that should generate quit a bit of power. If you can get 100 mW from each one you would need 4200 TC's to get 12 V at 35 A. Bob White On Sat, 06 Nov 2004 14:33:06 -0500 Ernest Christley wrote: > Per the discussion of breaking belts... > > Belts are needed for two things, the alternator and the water pump. > But if we replace the water pump can we get rid of the belt? > > Has anyone considered replacing the crank angle sensor with a PM > alternator/generator? > > The things are relative simple (a can of coiled wire with some magnets > on a spinning shaft in the middle), but what effect would a spinning > magnet have on the hall effect sensor that drives the ignition system? > > I've been looking at this a while. It looks like a hole could be > tapped and threaded into the top of the crank angle sensor shaft. A > generator with a threaded shaft would be screwed into that, properly > oriented threads insuring that the generator shaft will never come > unscrewed, and some straps on the housing to keep it from spinning. > > A 35A generator, is < 500W would only need a few ft.oz. of retaining > force at 6000RPM. > > The front pulley could be replaced with the same sort of installation. > > Another consideraton. Alternators have a heavy shell, bearings and > mounting because there is a substantial side loads and vibrations > derived from the belt. A gear driven generator can be much lighter, > with just a sheet metal can for a housing. > > I've got a number for an electrical engineer who is going to help me > work out the feasability and sizing for this application, but I'd like > the thoughts of anyone on the list. > > > -- > http://www.ernest.isa-geek.org/ > "This is by far the hardest lesson about freedom. It goes against > instinct, and morality, to just sit back and watch people make > mistakes. We want to help them, which means control them and their > decisions, but in doing so we actually hurt them (and ourselves)." > > > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html > > -- http://www.bob-white.com N93BD - Rotary Powered BD-4 (soon)