This only happens in lightly-loaded DC shunt field machines. Here is a pretty good explanation:
https://www.quora.com/What-is-the-run-away-condition-in-D-C-motors My electric machines professor demonstrated this to my class 40 years ago, He would kill the armature power before it blew up, of course. -- Ralph ________________________________________ From: andy pugh [bodge...@gmail.com] Sent: Sunday, September 25, 2022 4:36 PM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] XSY inverters (VFD) CAUTION: This email originated from outside the Walla Walla University email system. On Mon, 26 Sept 2022 at 00:11, gene heskett <ghesk...@shentel.net> wrote: > If the field supply fails, the motor runs faster and faster if it can, > until the armature parts > exit the frame in pieces big enough to make quite effective bullets. If the field supply fails, how is there any torque to spin the motor faster? -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1912 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=05%7C01%7Cralph.stirling%40wallawalla.edu%7Ca629e4c4c8ed4db3a6b908da9f4ee12d%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637997458411864744%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=dMs%2Beg2UGu31c7cGIubbJ5NsxgyrTTNU8PFOhktzlu4%3D&reserved=0 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
