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Multi-Way Conventional loudspeakers with crossovers

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Old 4th November 2012, 03:01 PM   #71
hispls is offline hispls  United States
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Originally Posted by Hentai View Post
Im not sure about unlimited thermal power, even if you make your electromagnet to withstand tons of power, neo magnets don't like high temperatures.

Too true. I was somehow thinking you could have a huge field coil that wouldn't get hot to the point of demagnetizing your neo. When you do your temperature testing of your field coil, compare that to the danger zone for neodymium.

I know I use some neo based permanent magnets and you can burn up some pretty robust coils long before the neo gets terribly warm to the touch, but little pencil eraser size bits of neo in a huge coil may not fare so well as large neo slugs sandwiched between big lumps of steel.
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Old 4th November 2012, 03:16 PM   #72
Hentai is offline Hentai  Japan
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well a subwoofer i think could be done as it won't reach too much in frequency response because of the nature of the field coil, (large inductance) also most amps will have trouble with it.
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Old 13th November 2012, 09:39 AM   #73
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Hentai.
Thanks for the posts, it is a pleasure to see some radical and creative work.
My compliments on your impressive project. Seems like you have had a lot of fun also.

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Originally Posted by LineSource View Post
It is possible to construct an underhung radial NdFeB speaker motor with over 2T gap flux by using a magnet-to-magnet topology across the gap.
Looks like you have had fun in FEMM too! Doesn't look like a voice coil will really fit in your simulation Have you tried this with a more realistic return structure?

Best wishes
David
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Old 13th November 2012, 09:53 PM   #74
Hentai is offline Hentai  Japan
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Thank you David, indeed i love working on this project.

Here is a close shot of the new central pole piece with the T-shaped top.
In that groove i will fit the copper shorting ring. Also with the top plate so you can get an idea of position and such.

I will borrow one of those DSLR cameras from a photographer friend of mine to make better pics these days.

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Old 31st December 2012, 10:43 AM   #75
Hentai is offline Hentai  Japan
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Happy New Year diyAudio community! May 2013 bring you the best and lots of success in your projects.

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Old 31st December 2012, 11:41 AM   #76
Zen Mod is offline Zen Mod  Serbia
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Old 31st December 2012, 12:13 PM   #77
Allar88 is offline Allar88  Estonia
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this should have been as a christmas present under the christmas tree!

Great job ! The frame is not diy?
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Old 31st December 2012, 12:16 PM   #78
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Wauw an eh...wauw what a great build! and have nice 2013!
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Old 31st December 2012, 03:20 PM   #79
Hentai is offline Hentai  Japan
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Cheers guys,

@Allar88 frame is still not diy. I have a hard time finding a big chunk of aluminum or sheets thick enough to machine the frame parts and what little i found was very very expensive. But 2013 will bring the diy frame i'm sure.
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Old 31st December 2012, 07:08 PM   #80
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Cheers guys,

@Allar88 frame is still not diy. I have a hard time finding a big chunk of aluminum or sheets thick enough to machine the frame parts and what little i found was very very expensive. But 2013 will bring the diy frame i'm sure.
You could always do a bolt/sleeve/slab construction like the Dynavox woofers are assembled. That wouldn't take much thought at all.

Later,
Wolf
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