Computing Flyback in Electromags w/Known I

Try re-phrasing the question into a form that enables the forum to help.

Thank you for your interest. First to clarify a mistake in my post and I will add more tech specs. Coils will be run in series, not parallel. I am trying to compute flyback voltage and currant to size a snubber to protect my h-brige.

Voltage:74 volts@5.5Amps and if my calculations are correct Z=27 Mag core is iron, laminated 1" SquareW/rounded corners

Are you looking to compute the interwinding capacitance of an inductor or are you interested in computing the uH of the inductor?

We would also need to know what core material your inductor will use.

Why would you use an H-bridge for a flyback converter? Or do you mean you need the capacitors for snubbing the switching devices in your H-bridge?

Square corners on your core might damage the insulation on your magnet wire when winding the wire on the core unless you use a bobbin, plus the really sharp corners cause the electrons to fly off the wire when try to go around those sharp corners.

You would do well to define what converter topology you are trying to implement. A fundamental switching frequency of 1.4kHz is something you might see in converters dealing with megawatts of power like an arc furnace.

It might be that English is not your mother tongue and that is the cause of much ambiguity but this also suggests a student desperate to start and finish a term paper or project the night before it's due.

Why put 8 coils in parallel? All this is very confusing to me. Can you tell us what your basic requirements are for this power converter? Input voltage, output voltage, output current, efficiency, size, weight, input-output isolation, cooling methods, etc.

Thank you Sir for your input. My H-bridge is used for polarity switching and Im trying to figure flyback voltage and currant to size Caps to help keep my speed in switching and protect the mosfets. This is a transistor switched commutator for a permenant magnet motor rotor, Rare earth 1"magnets set opposed in rows W/5000 gauss. Coils are to run at 74V at 5.5A. I will also correct an error in my original post, Coils are run in series/not parallel ! Of coarse as motor RPM increases so does my switching speed. at 3000 rpm I figure 1800 cycles per second. Is this out of the range of a snubbed H-bridge? All components can be air-cooled and heat sinked. Sorry if My post was confusing, I hope I have clarified myself.

I find it curious, that the OP desires some bloody detail with bloody little info. Is he real?

I think he wants to find the C, which is, of course, clearly dV/dt.

Op: C = dV/dt

Thank you Sir for your input. First time user here and I greatly appreciate all inquiries and appoligize for my short commings. I also incorrectly stated that I was wiring the coils in parallel when in fact they are in series. I'm using a H-bridge to switch polarity on a series of 8 coils, each with wound Fe 1" laminate core W/ohms of 16.68 each. Said coils are pulsing 1" rare earth magnets on an aluminum rotor with a gauss of 5500. Input voltage 74VDC at 5.5A. Z on each coil=27. I want to place Caps on mosfet supply legs to catch flyback and a zenier for high voltage to protect the bridge circuit and help speed decay time. My problem is how to figure uF and voltage for the capacitors because of the incured magnetic flux induced into the "off" switched circuit by the PMs and the increased resistance of the Caps due to frequency increase for higher rotor RPM. Your opinion/comments wecome.