Acoustomagnetic TPU / SEG calculation model

[EMdevices]

Magnetostrictive vibration of electrical steel sheets under a non-sinusoidal magnetizing condition
Sasaki, T.; Takada, S.; Ishibashi, F.; Suzuki, I.; Noda, S.; Imamura, M.
Magnetics, IEEE Transactions on
Volume 23, Issue 5, Sep 1987 Page(s): 3077 - 3079
Digital Object Identifier
 
Summary:

Magnetostrictive vibration of some electrical steel sheets magnetized with a pulse width modulated inverter has been presented. Magnetostrictive deformation was measured by a semiconductor strain gauge applied to specimens. The content of higher harmonics in the vibration was found to be more than that included in the magnetic flux. High frequency magnetization superposed on that of low frequency yields a relatively large amount of the deformation in the specimen. In spite of a change of magnetizing frequency of the PWM inverter, some components of the vibration remained at particular frequencies. The cause of these high frequency vibrations was experimentally confirmed to be a shape resonance of the magnetostrictive vibration. Resonance modes were detected in a ring specimen and discussions were made with reference to theoretical mode analyses using finite element method. These results allow us to confirm that the magnetostriction in electrical steel sheets is one of the main causes of high frequency vibrations in electrical machines.

P.S.  Note the following:  
1)  The content of higher harmonics in the vibration was found to be MORE THAN THAT included in the magnetic flux.
2)  High frequency magnetization superposed on that of low frequency yields a relatively LARGE amount of the deformation in the specimen.
3)  In spite of a change of magnetizing frequency of the PWM inverter, some components of the vibration remained at PARTICULAR frequencies.
4)  The cause of these high frequency vibrations was experimentally confirmed to be a SHAPE resonance of the magnetostrictive vibration.

... so, different shapes, e.g. larger rings compared to smaller rings, will have different frequencies at which they resonate. Shape matters ! But use the mixing mentality to excite any ring diameter.

[Magnon]

Magnetostrictive vibration of electrical steel sheets under a non-sinusoidal magnetizing condition
Sasaki, T.; Takada, S.; Ishibashi, F.; Suzuki, I.; Noda, S.; Imamura, M.
Magnetics, IEEE Transactions on
Volume 23, Issue 5, Sep 1987 Page(s): 3077 - 3079
Digital Object Identifier
 
Summary:

Magnetostrictive vibration of some electrical steel sheets magnetized with a pulse width modulated inverter has been presented. Magnetostrictive deformation was measured by a semiconductor strain gauge applied to specimens. The content of higher harmonics in the vibration was found to be more than that included in the magnetic flux. High frequency magnetization superposed on that of low frequency yields a relatively large amount of the deformation in the specimen. In spite of a change of magnetizing frequency of the PWM inverter, some components of the vibration remained at particular frequencies. The cause of these high frequency vibrations was experimentally confirmed to be a shape resonance of the magnetostrictive vibration. Resonance modes were detected in a ring specimen and discussions were made with reference to theoretical mode analyses using finite element method. These results allow us to confirm that the magnetostriction in electrical steel sheets is one of the main causes of high frequency vibrations in electrical machines.

P.S.  Note the following:  
1)  The content of higher harmonics in the vibration was found to be MORE THAN THAT included in the magnetic flux.
2)  High frequency magnetization superposed on that of low frequency yields a relatively LARGE amount of the deformation in the specimen.
3)  In spite of a change of magnetizing frequency of the PWM inverter, some components of the vibration remained at PARTICULAR frequencies.
4)  The cause of these high frequency vibrations was experimentally confirmed to be a SHAPE resonance of the magnetostrictive vibration.

... so, different shapes, e.g. larger rings compared to smaller rings, will have different frequencies at which they resonate. Shape matters ! But use the mixing mentality to excite any ring diameter.

See also this paper,

http://www.iop.org/EJ/abstract/0038-5670/35/2/R03

The resonance effect can be very strong, and therefore the TPU core must be made of elastic material, that allows the material strain without broken into small pieces.
Harmonics frequensies are used in a TPU. To transfer energy in between generated nested cylindrical EM walls, there must be same frequensies running in a cores circumference than there are in a generated harmonics EM walls around, because only same wavelenght and same phase can move energy in between each other. This is why SM used 3 different frequensies running around the TPU core : Each of those 3 base frequensies generates harmonics, and can also run with a gain when energy from the outer harmonic EM walls can move into cores circumference ; there are always same frequensies running around the core and in a nested EM wall outside, a perfect method to collect and compress energy. Use TPU phonon calculator to see those needed resonance frequensies and the core dimensions.


--Magnon

[Phantasm]

Magnetostrictive vibration of electrical steel sheets under a non-sinusoidal magnetizing condition
Sasaki, T.; Takada, S.; Ishibashi, F.; Suzuki, I.; Noda, S.; Imamura, M.
Magnetics, IEEE Transactions on
Volume 23, Issue 5, Sep 1987 Page(s): 3077 - 3079
Digital Object Identifier
 
Summary:

Magnetostrictive vibration of some electrical steel sheets magnetized with a pulse width modulated inverter has been presented. Magnetostrictive deformation was measured by a semiconductor strain gauge applied to specimens. The content of higher harmonics in the vibration was found to be more than that included in the magnetic flux. High frequency magnetization superposed on that of low frequency yields a relatively large amount of the deformation in the specimen. In spite of a change of magnetizing frequency of the PWM inverter, some components of the vibration remained at particular frequencies. The cause of these high frequency vibrations was experimentally confirmed to be a shape resonance of the magnetostrictive vibration. Resonance modes were detected in a ring specimen and discussions were made with reference to theoretical mode analyses using finite element method. These results allow us to confirm that the magnetostriction in electrical steel sheets is one of the main causes of high frequency vibrations in electrical machines.

P.S.  Note the following:  
1)  The content of higher harmonics in the vibration was found to be MORE THAN THAT included in the magnetic flux.
2)  High frequency magnetization superposed on that of low frequency yields a relatively LARGE amount of the deformation in the specimen.
3)  In spite of a change of magnetizing frequency of the PWM inverter, some components of the vibration remained at PARTICULAR frequencies.
4)  The cause of these high frequency vibrations was experimentally confirmed to be a SHAPE resonance of the magnetostrictive vibration.

... so, different shapes, e.g. larger rings compared to smaller rings, will have different frequencies at which they resonate. Shape matters ! But use the mixing mentality to excite any ring diameter.

Ok, I'm sold - Its clear that this effect occurs in a TPU - We have high frequency coils inducing high frequency flux which in turn induces magnetostrictive vibration in the core materials experiencing high frequency domain realignment

Its not 100% clear to me if a TPU is taking advantage of this effect but if thats the case then there are a couple of considerations - Firstly, the Self Resonance Frequency (SRF) of the cores is important (number 4 above). So, some of you guys are modulating the core material so as to achieve a desired SRF.

I think we can still achieve desired results by tuning a TPU to the core material's SRF and pumping 3 different coils with 3 different frequencies that are enharmonic with the core's SRF. I dont think we need really special cores if the coils are tuned to them... but I could be wrong.

Or are you guys trying to get 3 different cores to resonate at 3 different SRFs which in turn are enharmonic with eachother? If thats the case, couldnt you just use different length blocks of regular core material?

Secondly, if the harmonic interaction of the frequencies being pumped through the coils is intended to induce a magnetocoustic effect within the core material - I dont think this is correct but does that mean that coils of enharmonic frequencies are acting on the same core? That is to say that while there are 3 sets of coils each with their own harmonic frequency, are these frequencies heterodyned upon the same core material so as to induce resonance within the core? That cant be right..

Anyway, sorry to be conservative on this issue - I just think there'd've been some mention by SM about custom core material - I'm not saying it wouldnt work or that it wont achieve the desired results, I just want to make sure that its necessary to have custom cores. If there is a viable alternative available that is more simplistic, I'm for it.

--

One thing I'd like to know more about though is how the energy in the higher harmonic vibrations within the cores is harnessed - You mentioned something about microwave emission in the direction of the magnetic flux?

[Phantasm]

See also this paper,

http://www.iop.org/EJ/abstract/0038-5670/35/2/R03

The resonance effect can be very strong, and therefore the TPU core must be made of elastic material, that allows the material strain without broken into small pieces.
Harmonics frequensies are used in a TPU. To transfer energy in between generated nested cylindrical EM walls, there must be same frequensies running in a cores circumference than there are in a generated harmonics EM walls around, because only same wavelenght and same phase can move energy in between each other. This is why SM used 3 different frequensies running around the TPU core : Each of those 3 base frequensies generates harmonics, and can also run with a gain when energy from the outer harmonic EM walls can move into cores circumference ; there are always same frequensies running around the core and in a nested EM wall outside, a perfect method to collect and compress energy. Use TPU phonon calculator to see those needed resonance frequensies and the core dimensions.


--Magnon

It looks like youve answered my second question of my previous post here - specifically what coils/frequencies act on which cores - but I am confused by your terminology - what is 'the outer harmonic EM wall'?

"The generated nested cylindrical EM walls": Sounds like youre talking about the magnetic field lines (flux density?) in the cores? Is that right?

You said: "there must be same frequensies running in a cores circumference than there are in a generated harmonics EM walls around" So you mean just that the self resonance frequency of the core must be enharmonic with the frequencies induced by the coil wrapped around it in order to exchange energy from the EM field to the core or from the core to the field? is that right?

Then you said: "This is why SM used 3 different frequensies running around the TPU core : Each of those 3 base frequensies generates harmonics,"
Magnetocoustic vibration harmonics within the core? Or.. something else?


"and can also run with a gain when energy from the outer harmonic EM walls can move into cores circumference" here is where I'm confused about what you mean by outer harmonic EM walls - do you mean higher magnetocoustic vibration harmonics?

"there are always same frequensies running around the core and in a nested EM wall outside, a perfect method to collect and compress energy." Looks like you mean that each core has its own frequency - each core frequency is different but are enharmonic with each other. Yes? I guess thats the most important part anyhow..

Sorry for the confusion :\

[BEP]

When I pulse my TPU without a load at say 24V/4A and the connect my 100W bulb I see the same voltage from my power supply but the current is then only 1A or 2A!! Hmmm....it depends of course how the coils are connected.

Otto

@Otto

Is it possible adding the Resistance of the load either:
1. increase inductive reactance causing lower current from the power supply
2. connecting a load closes a circuit before as open without the load - causing a magnetic amplifier effect

?