On Thu, 13 Dec 2012 21:33:57 -0500, Joseph Gwinn
wrote:


Or, you just power the motor backwards! Which would require pinky-sized
wiring....

See plug reversing, above. And, no, the windings aren't any larger than
normal.

And, the B&D approach actually does drive in reverse for a moment. This
is explained in the patent.

Joe Gwinn
Some of the early "fast stop" saws just used a 2 position switch. One
position put both lines to the motor terminals. The other position
shorted the motor terminals while disconnected from the line.
Basically just shorted the "generator" output.

Again, just works on universal, or brush style motors -( and works
better on permanent magnet (DC) motors which are usually used on
battery powered motors) It does not bring the motor to a rapid and
sure stop, but it really reduces the spin-down time significantly.