In the thread on SawStop, the issue of making saws stop rotating shortly
after the user turned the power off came up, with the central example
being miter saws, which stop in a few seconds after the trigger is
released.

But it was not clear how this worked, and if it was more widely
applicable.

Anyway, I did a little research, and found the governing patent. The
electric brake was invented by Black and Decker, and apparently licensed
widely.

The patent is 6,037,729. To get a copy, go to http://www.pat2pdf.org
and follow the directions.

This approach is intended for universal motors, as used on small saws
and drills and routers, and is not directly applicable to induction
motors, as used in table saws.

Joe Gwinn