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<blockquote data-quote="Electrodynamic" data-source="post: 4746636" data-attributes="member: 548723">Let&#039;s just cut to the chase.&nbsp; You&#039;re flat out wrong.&nbsp; Here&#039;s the data to show it...Here&#039;s the solid top plate - all parts are steel, no air gap.&nbsp; We zoomed in the flux plot to range from 0 to 0.1T, so that you can see what&#039;s going on:<img src="http://i303.photobucket.com/albums/nn150/HaoDaMao/NoGapInTopPlate.png" alt="" class="fr-fic fr-dii fr-draggable " style="" />This is the flux in the system with no gap.&nbsp; Look at the stray flux, around the motor.Now look at what happens when we split that top plate with a standard 0.2mm(7 mil) gap):<img src="http://i303.photobucket.com/albums/nn150/HaoDaMao/GapInTopPlate.png" alt="" class="fr-fic fr-dii fr-draggable " style="" />Same everything, but we replaced that center &quot;sliver&quot; of the top plate with air, not steel.&nbsp; See any meaningful differences?&nbsp; If anything the stray field - OUTSIDE the motor - is reduced!&nbsp; Which means you&#039;re either wrong (no change), or really wrong (opposite of what you claim).Now how about the flux in the gaps?&nbsp; Let&#039;s look at that:<img src="http://i303.photobucket.com/albums/nn150/HaoDaMao/FluxComparison.png" alt="" class="fr-fic fr-dii fr-draggable " style="" />The flux is essentially the same.&nbsp; The difference is down at the limits -you couldn&#039;t even measure that difference, and having the speaker 6&quot; closerto your steel bumper would have a bigger impact on the measured flux.Bottom line, you&#039;re wrong.&nbsp; The facts don&#039;t back you up, the math doesn&#039;tback you up, and the tools don&#039;t back you up.&nbsp; Either you&#039;re using the term&quot;stray flux&quot; incorrectly, or you&#039;re just plain wrong in your understandingof flux.If you want, I can send you the FEMM model that I used to generate thesegraphs, and you can check it yourself.The main point that I think a lot of people are missing is that you (Nick Morgan) started a lot of the turmoil in this thread.&nbsp; Well...besides 02park, which is to be expected. //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif (I&#039;m secretly in love with you Chad!) You asked the question about split top plates, etc.&nbsp; You don&#039;t see me in any Fi threads stalking, pointing out any mistakes I think the designs have do you?Now I seriously have to get back to packing up the van to move into my new house...</blockquote>

[QUOTE="Electrodynamic, post: 4746636, member: 548723"] Let's just cut to the chase. You're flat out wrong. Here's the data to show it... Here's the solid top plate - all parts are steel, no air gap. We zoomed in the flux plot to range from 0 to 0.1T, so that you can see what's going on: [IMG]http://i303.photobucket.com/albums/nn150/HaoDaMao/NoGapInTopPlate.png[/IMG] This is the flux in the system with no gap. Look at the stray flux, around the motor. Now look at what happens when we split that top plate with a standard 0.2mm (7 mil) gap): [IMG]http://i303.photobucket.com/albums/nn150/HaoDaMao/GapInTopPlate.png[/IMG] Same everything, but we replaced that center "sliver" of the top plate with air, not steel. See any meaningful differences? If anything the stray field - OUTSIDE the motor - is reduced! Which means you're either wrong (no change), or really wrong (opposite of what you claim). Now how about the flux in the gaps? Let's look at that: [IMG]http://i303.photobucket.com/albums/nn150/HaoDaMao/FluxComparison.png[/IMG] The flux is essentially the same. The difference is down at the limits - you couldn't even measure that difference, and having the speaker 6" closer to your steel bumper would have a bigger impact on the measured flux. Bottom line, you're wrong. The facts don't back you up, the math doesn't back you up, and the tools don't back you up. Either you're using the term "stray flux" incorrectly, or you're just plain wrong in your understanding of flux. If you want, I can send you the FEMM model that I used to generate these graphs, and you can check it yourself. The main point that I think a lot of people are missing is that you (Nick Morgan) started a lot of the turmoil in this thread. Well...besides 02park, which is to be expected. [IMG]//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif[/IMG] (I'm secretly in love with you Chad!) You asked the question about split top plates, etc. You don't see me in any Fi threads stalking, pointing out any mistakes I think the designs have do you? Now I seriously have to get back to packing up the van to move into my new house... [/QUOTE]

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