X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from tomcat.al.noaa.gov ([140.172.240.2] verified) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTP id 1008488 for flyrotary@lancaironline.net; Mon, 20 Jun 2005 23:17:49 -0400 Received-SPF: none receiver=logan.com; client-ip=140.172.240.2; envelope-from=bdube@al.noaa.gov Received: from mungo.al.noaa.gov (mungo.al.noaa.gov [140.172.241.126]) by tomcat.al.noaa.gov (8.12.11/8.12.0) with ESMTP id j5L3H4Da024901 for ; Mon, 20 Jun 2005 21:17:04 -0600 (MDT) Message-Id: <6.2.1.2.0.20050620210910.0381ce28@mailsrvr.al.noaa.gov> X-Mailer: QUALCOMM Windows Eudora Version 6.2.1.2 Date: Mon, 20 Jun 2005 21:15:58 -0600 To: "Rotary motors in aircraft" From: Bill Dube Subject: Re: [FlyRotary] Re: Racemate Alternator In-Reply-To: References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed At 04:52 PM 6/20/2005, you wrote: > Hi! Bill >They are rated at 40amp at 2800rpm , what happens when the engine is >cranked up to 7200RPM? The thickness of the wire in the windings sets the maximum continuous current. The higher RPM will allow a higher voltage, if you wanted it, say for a 28 volt system. You could re-wind the stator with fewer turns of thicker wire, perhaps. This would raise the minimum RPM that would produce 14 volts, but would allow greater amperage. It is also within the realm of possibilities that you could replace the regulator with a much more elaborate DC to DC converter type. This could "buck convert" the high voltage (at high RPM) to low voltage with greater amperage. Bill Dube'