To have expansion you need measurable boundaries. I can't find a way around this. If I look at the stretch explanation, like a rubber baloon, a reference point on the surface would see things around it "expanding" away, but this does take away the actual balloon boundary envelope.
If on the...
Big Bang singularity can never be solved, so
Could the "big bang" have been an event where a large sum of highly-dense dark energy converted into mass, and in doing the result is like a nuclear explosion?
Could the "big bang" just have been a large sum of matter where the core becomes super...
If the universe is "expanding", does that mean less dense, or does that mean there are measurable boundaries?
With very far away galaxies that stay "alive" for a "short" time, is most of the very distant observable-from-earth universes now gone?
I did exactly that.
dB/dt * time = some J
Look at B in cos function
There are 4 distinct quadrants (that last gify shows it)
0-90deg (Bmax to zero)
90-180 (zero to Bmax)
180-270 (Bmax to zero)
270-360 (zero to Bmax)
The zero point is where dB/dt is max, as shown in that last gify.
I evaluated...
Looks like I missed Watts as square of current, corrected it in red. ~8x more energy put in eddy.
Check my math.
What about input watts? Let's fix the work impedance to say 1ohm.
100A DC vs 70.7Arms-sine-AC. (same Bmax)
1002 vs 70.72
10kWDC vs 4.998kWAC-RMS
So, ~2x the input power to yield...
Ok, slight shift to something related.
If dB/dt changes to 2*dB/dt (for the same time period), does magnitude of eddy grow 2* , or is it not linear?
70.7/25usec vs 100/6usec (sinerms = .707 * DC)
2.828 vs 16.66
5.89x bigger (faster dB/dt)
Now convert into power.
I2R = W, W*sec = J
Will...
It's 100% not necessary to look at voltage at all. Just graph the amps, which will be a sine wave.
I got some of my vector adds mixed up. Eddys are max when B field is zero, yet dB/dt is max when B=0 for AC.
See pic in post #25.
Why would I have two coils if I was going to connect them in series NS-NS? I would just wind one coil, no?
Heating one end of the metal? The B field passes through the object. The time to heat object is not in this discussion, having to heat super fast (relatively speaking)...
Please define "back and forth".
In both models the B field poles flip-flop at some frequency.
In both models dB/dt between zero B and Bmax happens.
The big diff is, in sine wave drive the dB/dt between zero B and Bmax, and Bmax down to zero B, happens much much slower.
So help me understand...
AC single coil has constant ohmic heating, and so does two coils PWM 50%.
In PWM one coil is exactly the same as single AC coil. Hence, not heating any coil more than the single AC coil.
In PWM 50%, the total J wasted from wire ohms is 2x that of AC single coil. Yes, a pitfall using 50% PWM. But...
So are you talking about dB/dt ?
In AC analysis the B field simply flip flops at some frequency, yet depending on the wave used dB/dt can be very very different. Sine wave is "slow", square wave is "fast". Frequency alone of the B poles flipping is not the whole story.
dB/dt has profound effect...
3-4usec is their fall time, slightly slower rise time. Since the two coils are driven 180 out of phase 50% PWM and the "off" time per cycle is ~3-4usec, the B field is "always on". In other words, the B field will very abruptly switch poles very very fast, only takes ~6usec to flip. In a LC tank...
I never claimed I invented a new way. There are several ways to construct inductive heating physically and using various circuits for control.
I have a simple 60Hz transformer that can dish out over 1000amps on the secondary, but it's still limited to just 2.4kW. Obviously this is a heavy...
The drive looks like this (animation gify). The faces would always be opposite poles, but the poles flip at freq. And since it's DC drive the B field is always max at any given time.
No luck being used. Magnetics/Physics converted into electrical ckt.