Interesting!
I think the generators described on the website work by resonating the
main winding with capacitance. Residual magnetism starts "pumping"
this parallel-resonant circuit to get the excitation current required.
Each revolution gives the resonant circuit another nudge, like
synchronous pushes to a pendulum. Voltage would increase without
limit until something limits it -- probably magnetic saturation in the
iron.
Cool!
A fan motor may not work as well as some other induction motors
because some fan motors sometimes have pretty high resistance. If
it's "impedance protected" so it won't burn out when stalled, it may
not work well as a generator because that winding resistance may
spoil the Q of the resonant circuit. The 10-1134 motor is such a
motor.
It sounds like your motor is a two-phase motor, the second phase being
produced with a capacitor. That's quite common on fans because they
run quietly. It's still an induction motor. I'd suggest that you
ignore the high-resistance winding, just put the cap in parallel with
the main winding.
I'd suspect (and the website confirms) that this setup will not start
generating under load. You must rev it up and get the excitation
established before you connect a load. You may need to experiment
with caps to get the amount of capacitance that resonates with your
motor. . Rev up the motor and vary capacitance while observing output
voltage, going for maximum.
Getting the speed right may be important. You need the speed to stay
fairly constant to stay near resonance. If the motor's nominal speed
is 225 RPM, it's "synchronous" speed will be higher. The difference
between synch speed and run speed is "slip" speed. To generate,
you'll want to run at synch + slip rather than synch - slip.
On 31 Jul 2004 10:30:55 GMT,
( Doug Goncz ) wrote:
In
http://www.google.com/search?q=induc...otor+generator
the first hit we read:
http://www.qsl.net/ns8o/Induction_Generator.html
"By adding capacitors in parallel with the motor power leads, and driving it a
little above the nameplate RPM, (1725 RPM ones need to turn at approximately
1875 RPM, and 3450 RPM ones at 3700 RPM) the motor will generate AC voltage! "
Now, my motor already uses a cap with the high resistance coil to produce a
rotating field. Does this mean it's not an induction motor and can't generate?