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Thread: Magnetically Levitated Speakers?

  1. #1 Magnetically Levitated Speakers? 
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    I was thinking, magnetically levitated bearings is a World War Two design. That they are using today in refrigeration and air conditioning in hermetically sealed compressors. So you do not need oil.

    But I was thinking how about a magnetically levitated speaker? I think it could be done. And I think you could really pump them with power. And not rip them, because they would be floating.

    You could get some long strokes out of them as well. I believe that you may not be able to get as long a stroke with ordinary materials.

    Just an idea, what do you think?


    Sincerely,


    William McCormick


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  3. #2  
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    I'm not sure I follow you on this one Willy, how would it produce a pressure wave?


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  4. #3  
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    Quote Originally Posted by Arcane_Mathamatition
    I'm not sure I follow you on this one Willy, how would it produce a pressure wave?
    Repulsion induction, would move the magnetically levitated disc. You can levitate metal discs or shapes, and then move them with magnetic energy.

    Not actually my cup of tea. But I thought it might make a cool device. You might be able to get more punch into a smaller package.

    Sincerely,


    William McCormick
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    The problem is, I believe what you are trying to describe IS how a speaker works, just with the one difference that what you are trying to describe doesn't have the ability to produce a pressure (sound) wave. You need that membrane in order to create a displacement, otherwise it won't create a forward pressure, and there won't be any sound. There needs to be an airtight seal that will negate the "levitation" that you are (ideally?) wanting to implement in your speaker.

    Great idea though, keep THIS type of posting up willy.
    Wise men speak because they have something to say; Fools, because they have to say something.
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  6. #5  
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    Quote Originally Posted by Arcane_Mathamatition
    The problem is, I believe what you are trying to describe IS how a speaker works, just with the one difference that what you are trying to describe doesn't have the ability to produce a pressure (sound) wave. You need that membrane in order to create a displacement, otherwise it won't create a forward pressure, and there won't be any sound. There needs to be an airtight seal that will negate the "levitation" that you are (ideally?) wanting to implement in your speaker.

    Great idea though, keep THIS type of posting up willy.
    I only need a couple thousands of an inch to keep it levitated. You can create a vacuum with one thousandth of an inch clearance.

    This thing or metal disc, could be hurled forward with larger movements. Creating a lot more pressure. A much stronger wave. Real wild bass.

    Sincerely,


    William McCormick
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    I understand what you're Saying willy, but I think the bigger problem is the amount of energy needed to do that, the necessary ammount of clearence to get a true reciprocating displacement so that the air can't "sneak" behind the disc and screw up the sound, and just, how big would this contraption ultimately be? The efficiency of it?
    Wise men speak because they have something to say; Fools, because they have to say something.
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    Quote Originally Posted by Arcane_Mathamatition
    The problem is, I believe what you are trying to describe IS how a speaker works, just with the one difference that what you are trying to describe doesn't have the ability to produce a pressure (sound) wave. You need that membrane in order to create a displacement, otherwise it won't create a forward pressure, and there won't be any sound. There needs to be an airtight seal that will negate the "levitation" that you are (ideally?) wanting to implement in your speaker.

    Great idea though, keep THIS type of posting up willy.
    Why does there need to be a seal around the disc/membrane? Doesn't a gong and an open drum work just fine? Yes, maybe it does need to be a bit bigger, but you can also use dynamic braking to slow it down again and also return some energy back to the system. At least it sounds feasible to me. Also, to reduce unwanted noise from the edges, there might need to be some finite element simulations on different shapes to reduce this effect. This topic probably belongs in a forum for ME not EE. Only the controls part would require EE.
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    the drum uses a column of air that vibrates, were as a speaker creates a wave through oscillation of the magnet in the coil, which, when combined with the cone attached to the magnet(airtight to prevent the air from moving around the speaker), causes the directed pressure wave to propagate in a direction, as opposed to everywhere; in a speaker, you want a directional sound wave, instead of a rapidly dissipating spherical wave
    Wise men speak because they have something to say; Fools, because they have to say something.
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