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A DIY Ribbon Speaker of a different Kind
A DIY Ribbon Speaker of a different Kind
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Old 8th July 2018, 08:08 AM   #1241
ndhennin is offline ndhennin
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Join Date: Apr 2002
Location: Lille (France)
Thank's for the answer Solhaga !
You have answered to more than my question, great !
I stupidly forgot that the coil has to stay in the flux coming from the iron all the time, so i do not have to bother about the flux between the magnet.
Now, i also know that there is no need for the iron to "over hang" the magnets.
Another question, with such a high flux you are getting with your motor and the small thickness of your iron plates, and a 3mm gap, nothing bends ?
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Old 8th July 2018, 09:04 AM   #1242
solhaga is offline solhaga  Sweden
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Join Date: Jun 2009
Location: Värsta Götaland
I would say that a 20 mm wide iron bar will bend.
Depending on how long it is of course.

That´s why I use 40 mm by 5 mm bars.
Downside is that it will require double the amount of magnets and of course result in a wider motor.

Some pictures of making my simple motor above:

Iron bars and aluminium stops::
Click the image to open in full size.

Click the image to open in full size.

Ready for the first magnet:
Click the image to open in full size.

That was easy:
Click the image to open in full size.

In its right place with some epoxy:
Click the image to open in full size.

As the next magnet will repel, I need a mounting jigg:

Click the image to open in full size.

Click the image to open in full size.

Next magnet must have the right polarity.
If I hold it in my hand, it will will flip right.

Click the image to open in full size.

And then just force it down:

Click the image to open in full size.

Some epoxy before the final destination:

Click the image to open in full size.

Click the image to open in full size.

Now I will have to wait a couple of hours before the next magnet can be mounted.

The tricky part will be when I mount the two legs of the motor together.
I'm thinking of using rails and then slide the two parts together and then --- BAAM!
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Old 8th July 2018, 02:58 PM   #1243
ndhennin is offline ndhennin
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Join Date: Apr 2002
Location: Lille (France)
i don't know if i am the only one, but i can not view your pictures
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Old 8th July 2018, 03:47 PM   #1244
solhaga is offline solhaga  Sweden
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Join Date: Jun 2009
Location: Värsta Götaland
I'll fix it.

Fixed?

Last edited by solhaga; 8th July 2018 at 04:06 PM.
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Old 8th July 2018, 04:30 PM   #1245
ndhennin is offline ndhennin
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Location: Lille (France)
Yes, thank you
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Old 13th July 2018, 06:55 PM   #1246
solhaga is offline solhaga  Sweden
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Join Date: Jun 2009
Location: Värsta Götaland
Quote:
Originally Posted by ndhennin View Post
Another question, with such a high flux you are getting with your motor and the small thickness of your iron plates, and a 3mm gap, nothing bends ?
Well.

Click the image to open in full size.

Front down:

Click the image to open in full size.

Front mid:

Click the image to open in full size.

Front up:

Click the image to open in full size.

Back down:

Click the image to open in full size.

Back mid:

Click the image to open in full size.

Back up:

Click the image to open in full size.

2,69 mm is too little, I'll probably have to insert 3,5 mm spacers or even 4,0 mm.
On the other hand, I can insert an additional spacer between the mid (210 mm) and treble membranes (80 mm)

Last edited by solhaga; 13th July 2018 at 07:03 PM.
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Old 14th July 2018, 04:49 PM   #1247
WrineX is offline WrineX  Netherlands
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Join Date: Mar 2004
Location: Den Haag
Quote:
Originally Posted by solhaga View Post
Well, just for the fun of it:

Click the image to open in full size.

Click the image to open in full size.

But the plot was the same as above:

Click the image to open in full size.

Even it can be tweaked to a higher or wider field, I guess it isn't worth the effort neither design nor build wise.
i did not know you where into these to 0r only sims
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Old 14th July 2018, 04:51 PM   #1248
WrineX is offline WrineX  Netherlands
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Join Date: Mar 2004
Location: Den Haag
Quote:
Originally Posted by solhaga View Post
I would say that a 20 mm wide iron bar will bend.
Depending on how long it is of course.

That´s why I use 40 mm by 5 mm bars.
Downside is that it will require double the amount of magnets and of course result in a wider motor.

Some pictures of making my simple motor above:

Iron bars and aluminium stops::
Click the image to open in full size.

Click the image to open in full size.

Ready for the first magnet:
Click the image to open in full size.

That was easy:
Click the image to open in full size.

In its right place with some epoxy:
Click the image to open in full size.

As the next magnet will repel, I need a mounting jigg:

Click the image to open in full size.

Click the image to open in full size.

Next magnet must have the right polarity.
If I hold it in my hand, it will will flip right.

Click the image to open in full size.

And then just force it down:

Click the image to open in full size.

Some epoxy before the final destination:

Click the image to open in full size.

Click the image to open in full size.

Now I will have to wait a couple of hours before the next magnet can be mounted.

The tricky part will be when I mount the two legs of the motor together.
I'm thinking of using rails and then slide the two parts together and then --- BAAM!
yes 20mm will bend with that kind of magnet i had a few bending with only 40x20x1 magnets over a length of 500mm steel
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Old 14th July 2018, 05:28 PM   #1249
solhaga is offline solhaga  Sweden
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Join Date: Jun 2009
Location: Värsta Götaland
Quote:
Originally Posted by WrineX View Post
i did not know you where into these to 0r only sims
I will eventually start a new thread when I have got a little bit further with my Rubanoid, meanwhile I only answered the FEMM question from ndhennin.
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Old Yesterday, 10:50 AM   #1250
WrineX is offline WrineX  Netherlands
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Join Date: Mar 2004
Location: Den Haag
Quote:
Originally Posted by solhaga View Post
I will eventually start a new thread when I have got a little bit further with my Rubanoid, meanwhile I only answered the FEMM question from ndhennin.
looking forward, since i want to do some more ruba to, they are even more efficient then the AMT. most certainly with that HUGE motor.
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