Todd Walton wrote:
On Thu, 17 Feb 2005 20:31:03 -0800, Paul G. Allen
<[EMAIL PROTECTED]> wrote:
Looking over the block diagram, considering it uses a micro controller and a
TRIAC, I
would say it manipulates the AC waveform only giving the motor what it needs to
keep
rotating. There's a few ways to do this, considering a motor will "freewheel",
it doesn't
always need current, it takes more to start than to keep running, etc.
How does it know that the motor is still turning?
If you wanted to cut current from the source and monitor this, you could
(not that this is what the device is doing). Any coil (including those in
motors) will induce current in wires connected to it /after/ it's current
source has been disconnected, or if a magnetic field is passed near it. Cut the
source current, and the motor becomes a sort of generator (alternator for AC
motors) and a detector on the source wires can measure the speed at which it's
turning, or if it's turning at all.
PGA
--
Paul G. Allen
Owner, Sr. Engineer, Security Specialist
Random Logic/Dream Park
www.randomlogic.com
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