---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 04/02/22: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:07 AM - Spark suppression diode on starter MOTOR (tomcostanza) 2. 10:49 AM - Re: Spark suppression diode on starter MOTOR (user9253) ________________________________ Message 1 _____________________________________ Time: 06:07:27 AM PST US Subject: AeroElectric-List: Spark suppression diode on starter MOTOR From: "tomcostanza" It's common (or maybe not so common) knowledge that spark suppression diodes are a good idea on relays and contactor coils. But I've found precious little discussion about putting one on the starter MOTOR (B lead). The motor windings have the same issue of collapsing magnetic fields. Is the battery supposed to absorb that energy? This is more of an academic question than a practical one, since airplanes aren't falling out of the sky without them. Anyone? -------- Clear Skies, Tom Costanza -- in year 17 of a 3 year project Read this topic online here: http://forums.matronics.com/viewtopic.php?p=506468#506468 ________________________________ Message 2 _____________________________________ Time: 10:49:24 AM PST US Subject: AeroElectric-List: Re: Spark suppression diode on starter MOTOR From: "user9253" Batteries don't absorb the energy from inductive voltage spikes. The controlling switch contacts do. As the switch contacts open, an arc jumps across the opening contacts. The energy is dissipated as heat. Starter motors have counter EMF that might limit inductive voltage spikes. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=506470#506470 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.