On 2/16/21 7:37 AM, Tedd Dillard wrote:
Thank you Steve I also have that information and am planning on building one that way. I was looking for feedback on performance as I have also heard about difficulties. I am glad to hear from someone that has actual satisfactory experience with the design. Thanks Teddy On Tue, Feb 16, 2021, 10:27 AM Steve White <steve.white1@xxxxxxxxx> wrote:I have a synchronous motor made that way and it works great. It has two flats machined 180 degrees apart. You really need a milling machine to cut the flats. My motor started as a standard 1/2 HP 3550 RPM induction motor. For a 1750 RPM induction motor as a starting point you need to cut 4 flats spaced 90 degrees apart. There are some guidelines buried in the archives about how deep and where to make the cuts. I actually have some PDF and JPG files of the guidelines but since we can't attach files I can't post them on this board. I didn't create these files. These are files that I have collected from various sources over the years. If you supply your E-Mail address I can send them to you. Steve White Cedar Rapids, Iowa
There was a LOT of discussion about this on the list, say, 10 years ago?There are some folks who actually did the flats *by hand* with a file, and it worked.
googling "site:pupman.com flats sync" turns up some hits.. https://pupman.com/listarchives/2005/Apr/msg00793.html https://www.pupman.com/listarchives/2000/November/msg00356.html https://pupman.com/listarchives/2001/July/msg00168.html https://www.pupman.com/listarchives/2002/February/msg00621.html _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxxxxxx https://www.pupman.com/mailman/listinfo/tesla