Rotating Magnetic Field's and Inductors.

[tinman]

In the video below,i have hooked up the trigger coil,and now am running the DUT as a pulse motor.

Straight off the bat,we have smashed the 50% efficiency barrier,as far as electrical P/in and P/out go's. In fact,we have beaten the 60% efficiency barrier<--how's them apples MH,much more than the 30% you once claimed to be about the limit.

P/in
200mA @ 12.49v = 2.498 watts
P/out
119mA @ 12.69v = 1.51 watts.

Electrical efficiency = 60.45%

https://www.youtube.com/watch?v=zTf4Bl79NZk


Brad

[EMJunkie]

It is 99.32620530% because 1 - (1/e⁵) is that much

Also, it should not be called a "Current Carrying Capacity" but a V/R limit - a consequence of the Ohm's Law.
The V/R limit is a completely different concept than the core saturation limit.
It is all described in detail here.

Thanks Verpies!!!

Yes I used the wrong term, V/R limit, simply because the Applied Voltage determines the Current because of R. Higher the Applied Voltage the Higher the Current will go. As you point out, this is Ohms Law.

Thank You for correcting this!

   Chris Sykes
       hyiq.org

[gotoluc]

Here you go mate, a second party confirmation with a suggestion how to further boost your results.

Link to video demo: https://www.youtube.com/watch?v=TwKd7UG1Wb8

Enjoy

Luc

[verpies]

Yes I used the wrong term, V/R limit, simply because the Applied Voltage determines the Current because of R. Higher the Applied Voltage the Higher the Current will go. As you point out, this is Ohms Law.

...and on the scope the V/R limit and the core saturation look like this:

[verpies]

Here you go mate, a second party confirmation with a suggestion how to further boost your results.
Link to video demo: https://www.youtube.com/watch?v=TwKd7UG1Wb8

Yes, keeping the low resistance of the coil and wiring is very important.

Keeping the "resistance" of the recovery capacitor as low as possible, is very important, too.
The trick is that a discharged capacitor has lower "resistance" than a charged capacitor.  This is the reason why a discharged capacitor is a better receiver of the "inductive spike" than a charged capacitor.  This is also the reason why the capacitor should be emptied before each "spike" for the most efficient energy recovery^*

The third method to increase efficiency is to keep the coil's ON pulse time below its Tau constant (L/R).


Cheers

_{^*MH & TK - please do not admonish me for this colloquiality - I know that the ESR does not change and I know how to analyze that decreasing current of a charging capacitor in a proper technical jargon, but I'm trying to simplify the vernacular as much as possible.}