Return-Path: Received: from bree.pipcom.com ([204.92.62.3] verified) by logan.com (CommuniGate Pro SMTP 4.1) with SMTP id 2515085 for flyrotary@lancaironline.net; Fri, 08 Aug 2003 09:25:18 -0400 Received: (qmail 2048 invoked from network); 8 Aug 2003 13:25:15 -0000 Received: from ras3-13.pipcom.com (HELO new) (204.92.62.145) by bree.pipcom.com with SMTP; 8 Aug 2003 13:25:15 -0000 Message-ID: <002001c35db0$26978f80$0b3cfea9@new> From: "Peter Cowan/Lexy Cameron" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: starters and solonoids (pt. 2) again Date: Fri, 8 Aug 2003 07:32:34 -0400 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 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Dale I'd say there are no low speed windings on the Mazda because there is only one wire from the contactor to the starter. When I figure out how to order the new solonoid, I will replace this system. Peter > I'm speaking in general here. I don't have intimate knowledge of the specific Mazda electricals you might be using. > > Proper engagement of the starter motor depends on a couple of things happening in proper sequence. > > [1] power reaching the "low speed" windings of the motor. > [2] as the motor begins to turn, the solenoid pushes the drive gear into engagement with the flywheel ring. > [3] the solenoid closes its integral contactor, sending current to the "high speed" windings of the motor. > > The configuration you describe would be seem to be putting power directly to the high-speed winding, not giving the solenoid time to mesh the drive gear as it normally would during the brief low-speed phase. That will result not only in missed starts, but rapid wear of the the drive and ring teeth. > > Dale > > > > Looking at Dale's excellent freehand drawing with the change that the Motor > > M is wired directly to "C" (I'm not using the contactor just the solonoid), > > I thought of another potential issue. I'm now getting frequent missed gear > > engagements when I hit the starter switch. Could this be due to a slight > > "timing" difference between this setup and one solonoid/contactor? With the > > one Mazda solonoid/contactor the first thing that moves is the solonoid > > which throws the starter gear into the ring gear, then the electrical > > contact is made for power to the motor. So the gear is activated a little > > ahead of the contactor. With my setup, power gets to the motor at the same > > time as power to the solonoid windings so the motor is likely staarting > > before the gear engages. Any thoughts/ > > Peter > > > > >> Homepage: http://www.flyrotary.com/ > >> Archive: http://lancaironline.net/lists/flyrotary/List.html >