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+--- Thread: CEMF and Flyback (/thread-132.html)
RE: CEMF and Flyback - unimmortal - 06-12-2024
Thanks Dave, thanks Jim.
So a large voltage capacitor after the diode, but before the (+) of the source powering the coil is required to catch what passes through the battery?
I've seen 45VAC on my pulse coils with a 36VDC input, and going by past experiments I'm going to need a pretty large capacitor to catch it all.
RE: CEMF and Flyback - Jim Mac - 06-12-2024
(06-12-2024, 10:46 PM)unimmortal Wrote: Thanks Dave, thanks Jim.
So a large voltage capacitor after the diode, but before the (+) of the source powering the coil is required to catch what passes through the battery?
I've seen 45VAC on my pulse coils with a 36VDC input, and going by past experiments I'm going to need a pretty large capacitor to catch it all.
My advice if using a capacitor is a High Voltage Cap with a Very Low Capacity Rating. All your power in flyback is mostly in Voltage. The lower capacity the Cap, the more voltage it will catch.
Ideally, think like 10 low capacity caps, Filling 1 at a time. Once all are filled, they connect in parallel (to increase current) then dump where you want it. Even more advantageous is converting the High Voltage back down before dumping to the battery. Sending 100V into a 12V battery with no current behind it is almost pointless.
RE: CEMF and Flyback - unimmortal - 06-13-2024
(06-12-2024, 06:59 PM)Dave Wing Wrote:(06-11-2024, 05:49 AM)Dave Wing Wrote: I find real value here… “when the voltage is removed can result in a CEMF voltage that exceeds the applied voltage and a CEMF current that is higher than when the motor was running steadily.”
That said CEMF is always there in our PM motors as long as they are in rotation, now if you shorten your pulsed “on time” so much that the CEMF voltage and current being generated are greater than your power pulse, you should be able to see that there may be a point where the CEMF will then supply more energy than it takes to run the machine.
I am of the view that a pulsed dc PM motor should be built to have exceptional rotational speed, to maximize CEMF production. Then you need to learn how to properly direct the CEMF back to the primary power source to recharge the supply that powers the initial power pulse.
CEMF can be directed in flow any direction you choose within the power winding of your motor, it can be sent back to the supply or into the secondary battery. You have a choice where to direct you CEMF.
Dave Wing
Switching 2 of my 6 generator coils sees an increase of only 0.002A current drawn for the pulse coils. So the gen coils are almost pulling their weight, but not quite. I'll re-wire and switch 3 coils at a time and see if I can get a current drop and rpm increase.
@Jim Mac - 10 x 400V 10uf capacitors for collecting?