Bob Scott said:I'd like to understand electromagnetics a bit better. What is the definition of electromagnetic flux? I'm attempting to make a better equation for flux density.
Is flux static, like a measure of the magnetic field intensity, as the lines of force that you can see using iron filings over a bar magnet?
Or is it defined as dynamic only, applying to AC fields only? The equation for B (AC flux density) in Gauss in my Dad's old engineering books applies to AC voltages. These books are really terse.
The ambiguity is in the word "flux" itself. When something is in a state of flux it is changing.
microtexan said:Why are you trying to make a better equation for flux density?
Papabravo said:I don't mean to be impertinent but a saturated inductor in an SMPS sounds like a really bad idea. Are you sure that is what you want to do?
Oh, you would never sound impertinent.
The saturation is part of the oscillation cycle. As soon as the core saturates, the driving transistor turns off. It's been done before in photographic Xenon flash units and... remember the old Mark 10 capacitive discharge ignition? See:
I'd like to understand electromagnetics a bit better. What is the definition of electromagnetic flux? I'm attempting to make a better equation for flux density.
Is flux static, like a measure of the magnetic field intensity, as the lines of force that you can see using iron filings over a bar magnet?
Or is it defined as dynamic only, applying to AC fields only? The equation for B (AC flux density) in Gauss in my Dad's old engineering books applies to AC voltages. These books are really terse.
The ambiguity is in the word "flux" itself. When something is in a state of flux it is changing.
That's correct. The rule comes from Faraday's and Lenz's Laws. Faraday's Law says if a voltage on a wire loop varies in time: then so will the flux through that wire loop. And vice versa.The example given the Xenon flash, sounds allot like a Florecent starter. Right at saturation it disconnects the current there-by causing the feild to breakdown. Is the math involved based on Maxwell's equations?
Sorry to post as this is out of my league, but caught my eye, as I need more Theory work to understand everything I am learning. I am a hobbyist so take it easy on me..lol
The math escapes me, sorry to admit.
-BaC
Sorry to barge in on your topic, but it's kinda related.
Here follows a quiz, one I'm not quite solving yet:
So you connect a 220V 125Hz supply across a coil, the current in the coil reaches 692mA after 3.2ms, and then the circuit is switched off, probably using a switch between the supply and coil - hehehe......
What would the final steady value of current be?
Any educated guesses?
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