I've had two different Magnepan speakers over the years. They are fine for what they are, but for reasons of my own I no longer have them. On the other hand, I have never owned a field coil speaker so far as I know. I vaguely know what the technology means.
Today I had the sputtering candle that, in my brain, substitutes for a brilliant flash of insight 😛:
Could a flat panel speaker be designed that is similar to the Magnepan but uses a huge, flat electromagnet(s) instead of expensive permanent magnets? Has it been tried?
Today I had the sputtering candle that, in my brain, substitutes for a brilliant flash of insight 😛:
Could a flat panel speaker be designed that is similar to the Magnepan but uses a huge, flat electromagnet(s) instead of expensive permanent magnets? Has it been tried?
Aw, darn, I hate it when Reality crushes my ideas 🙂 For the DC coil at least, I would think a resistance > 0 ohms would be desirable in this case....? Based upon my sketchy grasp of physics, I suspect the weakness in my idea is that it is hard to make an electromagnet using a flat trace over a large surface, compared to the traditional iron core winding? If this is true, then why not lots of little "conventional" electromagnets? OK, so my project is trading cost of permanent magnet material for iron/ferrous cores for the electromagenets, but it is still an innovation 😀
I don't think you could achieve the required flux density in a form factor that would allow them to still function as a dipole. I'm not sure even making that trade off that it would work in any practical sense, the comment about room temperature superconductors is not off target imo.
I did make take a look at this a number of years ago. The bottom line, 1- waaayyy more expensive, and 2- the physics doesn't work.
I looked at both a single ended planer type and the typical tru ribbon arraignment. The planer type simply does not have the room for a good pole size and wire.
The tru ribbon style magnet arraignment can be done BUT again by the time you get a good pole size you end up with a undesirably large overall magnet structure with all the wire. Looked like a maybe if the design was a wave guide or horn so that there is more room for the mag structure.
There was some advantage with electro with mag field uniformity however.
In the end it was too complex and expensive and the perf gain minimal
I looked at both a single ended planer type and the typical tru ribbon arraignment. The planer type simply does not have the room for a good pole size and wire.
The tru ribbon style magnet arraignment can be done BUT again by the time you get a good pole size you end up with a undesirably large overall magnet structure with all the wire. Looked like a maybe if the design was a wave guide or horn so that there is more room for the mag structure.
There was some advantage with electro with mag field uniformity however.
In the end it was too complex and expensive and the perf gain minimal
i guess someone else had that idea too. failing to make it, he went on to invent ESL ��
just as a funny. I worked in the Cornell synchrotron lab a while back. They were getting ready to dismantle a large electromagnet ( about 20 tons!) so I wanted to do some experiments. I wanted to hang ribbons ( with no physical structure around them) in free space a foot or two off one end to get some real world measurements of a ribbon with no magnets around them. Unfortunately it never happened
- Status
- Not open for further replies.