[GTALUG] mysterious restarts

[D. Hugh Redelmeier]

| From: Lennart Sorensen via talk <talk at gtalug.org>

| Well I am quite sure they are running AC motors, so they would be taking
| the DC and inverting it to AC and making it whatever voltage they need
| at the time for the motors.

Most people think 60Hz when they think AC.  But I would guess that in
a motor AC is timed to the rotation so that commutators (I think
that's what they are called) can be eliminated.

Would that AC be 60Hz or would it be variable, matching some function
of the motor's current speed?