Maximum current output without using the circuit is 2 amps. The circuit is definitely is a benefit.
Lets find renewable solutions to reduce energy cost
Hi, I configured the PMA using just 2 stators to form a 3 phase star, 8 coils per phase. Phase to phase resistance = 9 ohms.
Rotor RPM Voc DC
Rotor RPM Vin DC Amps in Amps out
100 16.5 ? 0.2
200 27.3 0.2 1.0
300 28.8 2.0 5.0 Vout = 12.8Vdc
Free wheeling diode temp = 82 degrees F
50% duty cycle
test fixture limit 300 RPM using load
Vout = 12 volt deep cell test load
measurements ball park , 60 Watts appears to be the limit of test fixture under load.
I have to remove one stator and rotor and then I will be able to road test. Search for ideas on how to limit voltage to 100 volts at the input to protect circuit. Comments welcome
Hi, video of test circuit operation.
video not posting-- Edited by GoVertical on Sunday 13th of May 2012 10:29:06 PM
-- Edited by GoVertical on Sunday 13th of May 2012 10:30:12 PM
-- Edited by GoVertical on Sunday 13th of May 2012 10:31:19 PM
-- Edited by GoVertical on Sunday 13th of May 2012 10:34:16 PM
-- Edited by GoVertical on Sunday 13th of May 2012 10:35:51 PM
Hi, ran the test again using a the larger air core. About 60 watts at the input and about 60 watts at the output. Measurements are just ball park but the inductor was much cooler. Having the right size inductor for the switching frequency makes a big difference. Larger wire, less resistance. I have to buy a inductor that is rated for 15 amps and adjust the switching frequency for the impedance of the inductor.
New test data;
rotor speed 500 RPM
Duty cycle 50%
Stators 4 coils per phase
stator resistance < 1 ohm
Circuit temp 82 degrees Fahrenheit
Inductor temp 170 degrees Fahrenheit
I need a better inductor.
At this time I believe F&P stator should be wired to 6 coils per phase.
Hi, analog amp meters are working. It is nice to how much the duty cycle affects the current at the output. Input cap is only rated at 125 volts, 12 coils per phase is producing a very high voltage at the input. The cheap-o meter is unable to read the voltage at the input at higher RPMs. I was able to read 2.5 amps at input and 5 amps at output. I am changing the PMA stator connection to 4 coils per phase. Will post results when available.
Hi, meters are mounted. I have never seen a shunt before. The mounting nuts are very small. They included everything except a wiring diagram. Thank goodness for google search.
stator winder video
I was able to remove the stator shaft . The winding resistance is 149 ohms , 135 ohms. The center hole will have to be drill out to accommodate a 5/8 shaft, a jig will have to be fabricated to keep the hole centered. The wire is very small, it will be interesting to see what kind of open circuit voltage will be generated. The small size and light weight is very appealing. Ceiling fan cost $20.00 US.
Hi, purchased ceiling fan and removed stator. I am down sizing the PMA until I have a better understanding of the Buck circuit limits. The F&P is just to big to test with, it scares me.
The new parts have arrived. The analog amp meters included a shunt resistor. I have to fabricate the rotor for the CF stator. I am using 7/8x1 7/8x3/8 ceramic blocks for the rotor and will include a metal band on the outside of the magnets, the same method used on the F&P stock rotor. The CF stator has two single phase windings. I will post results when available.