Confirming the Delayed Lenz Effect

[gotoluc]

Hi Luc,

Wonderful video.

Would it be too much trouble to ask to see the scope when the load is applied?

Thanks, Garry

Hi Garry,

I didn't show the Scope Shot when the Secondary is under load as it would probably confuse people.

This is what confused me in all my Prior tests using my SG output through a Shunt Resistor and looking at the RMS reading across it when the Secondary is under load.
The Shunt's RMS readings on the Scope are higher when under load at the Lower Frequencies. It was only at 4.8kHz that the RMS value on the Shunt dropped. However, I can now see that's not the case. Using my H-Bridge and Special Current Meter has revealed that.

If you still wish to see the Scope Shot I'll post it but I don't want to hear what I just explained.

I trust my Special DC Meter more than any Osillyscope

Let me know

Luc

[CRANKYpants]

Hi Thane,

Yes you are correct ... it's dropping!
As you know the Delayed Lenz Effect is best when the Secondary has most load (short circuit). Then the Frequency can be dropped much more and still have no Effect on the Primary.

The other interesting thing is this morning I thought of connecting the MOT in REVERSE.
That is, to use the Secondary as Primary and the Primary as Secondary.
The Lenz Delay works the same in this configuration, Luc

THIS IS EXACTLY HOW THE BiTT AT OTTAWA UNIVERSITY WAS DESIGNED: http://www.youtube.com/user/ThaneCHeins?feature=mhee#p/u/35/RbRPCt1-WwQ WITH A 300 OHM PRIMARY.

NEXT STOP... INFINITELY EFFICIENT BiTTS WHICH CONSUME ONLY REACTIVE POWER AND DELIVER REAL POWER TO THE LOADS.  http://www.magmet.com/cutcore.php

CHEERS
T

[ramset]

Oy Vey
The Boss is inviting the whole world to see Overnudity!!
Looks like I'll be cleaning the bathrooms around here  A lot more
than usual...........
CinderFellah indeed !!

Chet

[garrypm]

Luc,

Forever the gentleman.

Thanks for the offer to show the shots.

Now I understand, there is no need.

Thanks, Garry

[gotoluc]

At everyone,

here are 2 Scope Shots with a 49vdc input to H-Bridge @54ma set at 1.28kHz.

At this Frequency the MOT has Zero change in current when the Secondary is under Load (7 watts 120v bulb used in last video)

First Scope Shot is with Green Probe across Primary and Yellow Probe across Open Secondary

Second Scope Shot is with Green Probe across Primary and Yellow Probe across Loaded Secondary (bulb)

BTW, for anyone is interested I changed my 4 MOSFET's on the H-Bridge from IRF640N to IRF540N.
At this Frequency the H-Bridge now consumes 60ua (idle) compared to 120ua prior this small change.

Luc