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Author Topic: Magnetic fields within a toroid inductor.  (Read 93415 times)


Magluvin

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Re: Magnetic fields within a toroid inductor.
« Reply #136 on: September 28, 2013, 05:02:08 AM »
So that must be how a clamp amp meter measures DC current. ;)


Mags

Magluvin

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Re: Magnetic fields within a toroid inductor.
« Reply #137 on: September 29, 2013, 02:06:35 AM »
Here is a pic of a cool field viewer. This could be done with a toroid. Piece of plexi with a hole for the outer diameter of the toroid and a small circle piece for the toroid hole.  It would be interesting to see if iron filings do anything around the toroid.

Mags

Newton007

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Re: Magnetic fields within a toroid inductor.
« Reply #138 on: September 29, 2013, 12:45:20 PM »
I think the magnetic field would be stronger on top of the plexiglass than on the bottom.but that is just a guess. :)

poynt99

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Re: Magnetic fields within a toroid inductor.
« Reply #139 on: September 29, 2013, 01:43:11 PM »
So that must be how a clamp amp meter measures DC current. ;)


Mags
And AC current. ;)   60Hz is no problem for many Hall sensors.

Dave45

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Re: Magnetic fields within a toroid inductor.
« Reply #140 on: September 29, 2013, 02:08:34 PM »
Been playing with my setup, Im not getting a very good coupling between the toroids and the pickup coil,  :-\ perseverance

I may hit it with some high voltage just to see if I can get liftoff  ;D

Magluvin

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Re: Magnetic fields within a toroid inductor.
« Reply #141 on: September 29, 2013, 06:41:35 PM »
And AC current. ;)   60Hz is no problem for many Hall sensors.

Absolutely ac and dc. I just never knew it was a hall sensor. I figured wire wound pickup can read ac, but how dc?  ;) I suppose it could be possible that a pickup coil used in a clamp could measure dc current if the pickup coil had an imposed ac signal(small as not to affect the circuit being measured) and the meter circuit monitor the differences between the pos and neg portions of the signal. DC produced field in the clamp core would polarize the meters ac signal as it tries to induce the clamp core. But the hall is much easier. ;D

Mags

Magluvin

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Re: Magnetic fields within a toroid inductor.
« Reply #142 on: October 01, 2013, 06:38:48 AM »
Opened another older controller box and it had 2 of the same current sensors. Both boards have a very strong conformal coating, so removing parts is a bit of a chore. Dont want to break the tiny leads of the hall sensors. Only removed 1 from each board, and only one of which I could read the pt no. 3503u. Data sheet below.

Says tested from 0-23khz, then typ is listed as 23khz.  So Ill check that to see if thats the limit.

If we want to read field in the hole of a core, and had bridges as shown below in the core, then I put the hall sensor in the gap, up and down reading, would there be any field measured by the hall? ;) And what if the gap is shorter? What if the gap was longer? I believe we are going to find that flux propagates across the hole of the toroid core and is not 'just' locked in the core.

Now if this is where all or most of the mutual inductance between windings, in the hole, then what of the parts of the winding on the sides and outer diameter of the core? And would those parts of the winding be more included if the toroid were encased in a shell core? These are some questions I have with all this.

Mags

Dave45

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Re: Magnetic fields within a toroid inductor.
« Reply #143 on: October 05, 2013, 01:25:32 AM »
I wasnt getting a good coupling between my toroid coils and the pickup coil, because the pickup was not part of the magnetic path  :)

Been thinking about the tpu
I think he figured out a way to stop bemf, turned it into femf

Dave45

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Re: Magnetic fields within a toroid inductor.
« Reply #144 on: October 10, 2013, 02:34:06 AM »
So I hooked the Rodin type toroids to the zvs circuit, I am able to dimly light a 12 volt auto bulb from the pickup coil  :o

hanon

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Re: Magnetic fields within a toroid inductor.
« Reply #145 on: October 27, 2013, 10:46:34 PM »
For your consideration:

http://www.youtube.com/watch?v=5mpE02hwN4s

Regards

Magluvin

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Re: Magnetic fields within a toroid inductor.
« Reply #146 on: October 29, 2013, 01:37:31 AM »
I picked up this pdf "reinventing the wheel" thread, and starting at page 4, its content follows the "classic flux anomaly" pdf I posted earlier here.   ;)

Mags

hanon

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Re: Magnetic fields within a toroid inductor.
« Reply #147 on: November 05, 2013, 06:43:22 PM »
Hi all,
 
Another interesting video:
 
http://www.youtube.com/watch?v=Hz_xS3lHZsk
 
Regards