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Author Topic: Magnet coil cores, demagnetization power and Lenz delay.  (Read 242452 times)

MileHigh

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Re: Magnet coil cores, demagnetization power and Lenz delay.
« Reply #240 on: December 27, 2014, 08:35:24 PM »
Synchro1:

I am not paid to go on this forum.  Nor is Mark.  The whole idea is ridiculous.  I don't even believe that you believe what you are saying.  The rest of your posting is just the same tired old tomfoolery.

You are the instigator and you push enough and once in a while you are going to get some push back.  You have an opportunity to stop right now and you should take it.

Going forward from this point on you can act like a normal person if you really want to.  I mean that on a personal level and on a technical level.

MileHigh

synchro1

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Re: Magnet coil cores, demagnetization power and Lenz delay.
« Reply #241 on: December 27, 2014, 10:30:15 PM »
I need a simple test done: The materials required are a ferrite core and magnets. The instrument, a multi-meter with an Ohms detector. Now, if the Ohms reading across the ferrite changes with a variation in magnetic viscosity, we can carry forward wih an important tool! 

MarkE

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Re: Magnet coil cores, demagnetization power and Lenz delay.
« Reply #242 on: December 27, 2014, 10:50:50 PM »
@Milehigh,

What about all the demeaning and abusive language you've insulted me with? I just copied your style. Both you and MarkE get paid to run rubbish into this forum.
And on what facts do you base that absurd allegation?  Do you realize that when you assert obviously false nonsense that it's your credibility that you hurt?
Quote
Then you reverse the blame. Why is it that the two of you have me personally targeted me as a full time occuption? You're the last one to talk about propriety. You act like a savage animal. Everyne knows you're an abomination. You're a Jackal on the veldt and a Cannibal. Stephan wised-up to your two faced routine already. You can just get used to the back flack or hit the road.

My point is that: "Magnets toughen the Weiss Domains and delay re-polarization in the core material".
Is your idea that domains work harden?  If for example I take a rod of 3D8 material and then magnetize to saturation once, how many times must I cyclically take it to saturation in the opposite direction and then to saturation in the first direction before the hysteresis increases by say 10%?

MarkE

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Re: Magnet coil cores, demagnetization power and Lenz delay.
« Reply #243 on: December 27, 2014, 10:52:49 PM »
I need a simple test done: The materials required are a ferrite core and magnets. The instrument, a multi-meter with an Ohms detector. Now, if the Ohms reading across the ferrite changes with a variation in magnetic viscosity, we can carry forward wih an important tool!
Most DMMs will not be able to register the DC resistance across a ferrite core.

synchro1

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Re: Magnet coil cores, demagnetization power and Lenz delay.
« Reply #244 on: December 28, 2014, 12:42:22 AM »
Most DMMs will not be able to register the DC resistance across a ferrite core.

You're just completely full of shit!

MarkE

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Re: Magnet coil cores, demagnetization power and Lenz delay.
« Reply #245 on: December 28, 2014, 01:15:31 AM »
You're just completely full of shit!
Take any ferrite used for EMI control such as a 4C65 right out of the Ferroxcube catalog that you linked.  The volume resistivity is about 10MegOhm * Meters.  A half inch square cross section one inch long is:  1E7 * 1 / ( (0.5*0.0254)2) or ~62G Ohms.  Power ferrites like a 3C94 have much lower volume resistivities.  3C80 material is listed around 4Ohm * Meters.  The same 0.5" square by 1" long piece would be in the 24K Ohm range.

synchro1

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Re: Magnet coil cores, demagnetization power and Lenz delay.
« Reply #246 on: December 28, 2014, 04:40:45 AM »
@MarkE,

Here it is translated from Mandrian Chinese:


In general, resistivity of intrinsic semiconductors decreases with increasing temperature.

synchro1

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Re: Magnet coil cores, demagnetization power and Lenz delay.
« Reply #247 on: December 28, 2014, 04:52:25 AM »
Increasing magnetic flux density in the ferrite by fastening magnets to it causes One: Magnostriction. The material will shrink because the electron orbits align. Two: Adiabatic cooling and Three: Increased resestivity. So the Ohmic resistance will rise with the addition of the magnets. Contrary to what MarkE said, any DMM With a good battery and Ohms detector will work!

The important relationship here is between the increase in Ohmic resistance and the delay in the re-polarization of the ferrite. The higher the Ohms, the greater the DLE.

synchro1

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Re: Magnet coil cores, demagnetization power and Lenz delay.
« Reply #248 on: December 28, 2014, 05:39:14 AM »
That solves the positioner problem. All we need to do now is to wire the Ohms detector electrodes from the ferrite core to the 731 Op Amp  to raise and lower the pivot sheer magnet adjustor at the back of the core.

MarkE

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Re: Magnet coil cores, demagnetization power and Lenz delay.
« Reply #249 on: December 28, 2014, 05:44:09 AM »
@MarkE,

Here it is translated from Mandrian Chinese:


In general, resistivity of intrinsic semiconductors decreases with increasing temperature.
And the context for this nonsequitur is?

MarkE

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Re: Magnet coil cores, demagnetization power and Lenz delay.
« Reply #250 on: December 28, 2014, 05:53:32 AM »
Increasing magnetic flux density in the ferrite by fastening magnets to it causes One: Magnostriction. The material will shrink because the electron orbits align. Two: Adiabatic cooling and Three: Increased resestivity. So the Ohmic resistance will rise with the addition of the magnets. Contrary to what MarkE said, any DMM With a good battery and Ohms detector will work!

The important relationship here is between the increase in Ohmic resistance and the delay in the re-polarization of the ferrite. The higher the Ohms, the greater the DLE.
I'd like to see you show a drop in resistance measured by your favorite DMM on any chunk of NiZn ferrite that you care to choose by subjecting it to a magnetic field.  If you can manage such a thing you either have a big thin sheet of material with conductive contact plates on each side and/or a really good DMM.

It would also be fun for you to demonstrate measurable magnetostriction in a ferrite of your choice MnZn or NiZn.  Making the wires buzz from magnetostriction does not count as showing the ferrite core deform.

MarkE

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Re: Magnet coil cores, demagnetization power and Lenz delay.
« Reply #251 on: December 28, 2014, 05:56:39 AM »
Is that a typo?  Did you mean a uA731 voltage regulator or an LM741 Op-Amp?

synchro1

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Re: Magnet coil cores, demagnetization power and Lenz delay.
« Reply #252 on: December 28, 2014, 05:38:14 PM »
I'd like to see you show a drop in resistance measured by your favorite DMM on any chunk of NiZn ferrite that you care to choose by subjecting it to a magnetic field.  If you can manage such a thing you either have a big thin sheet of material with conductive contact plates on each side and/or a really good DMM.

It would also be fun for you to demonstrate measurable magnetostriction in a ferrite of your choice MnZn or NiZn.  Making the wires buzz from magnetostriction does not count as showing the ferrite core deform.

@MarkE,

I would bet money you never even tried it. I never specified any particular grade of ferrite. Ferrite is a gray ceramic metal with crystaline molecular structure that has both semi-conductor and piezo-electric properties. Don't you think it would make more sense to tailor the choice of ferrite characteristics to the task rather then to some arbitrary selection you chose as an example to falsely demonstrate it's impracticality? All you do is shoot wet farts over everything.

I deeply resent you trivializing the measure of core resistivity in Ohms as a sensor for an Op Amp flux density regulator. Part numbers can switch around depending on the manufacturer as you well know! These improvements cover two parameters. A positioner screw to change the rotor gap and a flux density contoller for the core.

MarkE

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Re: Magnet coil cores, demagnetization power and Lenz delay.
« Reply #253 on: December 28, 2014, 06:27:15 PM »
@MarkE,

I would bet money you never even tried it. I never specified any particular grade of ferrite. Ferrite is a gray ceramic metal with crystaline molecular structure that has both semi-conductor and piezo-electric characteristics. Don't you think it would make more sense to tailor the choice of ferrite qualities to the task rather then to some arbitrary selection you chose as an example to falsely demonstrate it's impracticality? All you do is shoot wet farts over everything.

I deeply resent you trivializing the measure of core resistivity in Ohms as a sensor for an Op Amp flux density regulator. Part numbers can switch around depending on the manufacturer as you well know! This covers two parameters. A screw to change the rotor gap and a flux density contoller for the core.
Then you would bet wrong.  You deeply resent a straw man you just built?  Well then good for you.  Those straw men can be tough characters.  Are you imagining some conversation that you think you have been having?  Perhaps you would like to point out the posts where you proposed a design and it was unfairly shot down.

synchro1

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Re: Magnet coil cores, demagnetization power and Lenz delay.
« Reply #254 on: December 28, 2014, 06:40:52 PM »
The Op Amp "levitator" circuit could inlude the "Globe" type of efficient electromagnetic magnet augmented  coil. This would mount on the back of the magnet stack instead of the permanent magnet pivot sheer, and resemble a smaller versión of the large GAP magnet core coil. This kind of "Flux Balancing" actuator would probably result in a much finer tuning range.

Let's review the chain of events: The rotor achieves DLE at CMF and accelerates. The increased rotor frequency raises the flux density in the coil core and delays re-polarization that advances the reflected wave too far from TDC stalling the acceleration. The Ohm sensor detects a rise in resistivity and the controller coil weakens the field which retards the timeing, and acceleration resumes!