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Why is a tight gap better?

Old 03-04-2005, 11:25 AM
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(get your minds out of the gutter)

I'm just wondering why a tighter gap on a driver is better.

I've seen companies boast about their "ultra tight gap design" .. .but I can't seem to put together why it would be such a benefit. Especially considering the small difference in gap size between a standard driver and one with a supposed "tight" gap.

Can anyone help explain? If possible, can you give me some sort of reference to know what a wide/standard/tight gap would be?
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Old 03-04-2005, 11:29 AM
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good question. i wanna know now to? possibly magnetic effeciency?


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Old 03-04-2005, 11:48 AM
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strenght of the magnetic field applied to the coil is my guess
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Old 03-04-2005, 11:49 AM
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You can get stronger BL with a tighter gap which can increase sensitivity and linear xmax (depending on the rest of the design)

A tighter gap can also cause the pole/magnet assembly to be more effective as a heat sink... (less distance/air inbeween the coil and the pole)

The downside to a tight gap is that the coil cannot expand from heat as much before it starts to rub or becomes siezed...

Iam sure most designers try to optimize these pros/cons...
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Old 03-04-2005, 08:25 PM
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The smaller the gap, the less reluctance in the magneti circuit, so the more magnetic flux surrounds the coil, which when energized will magnetize, and react with the flux in the gap to produce the cone movement... so tighter gap means that you get more flux, more flux means more reaction, more reaction equals more movement for a given amount of current into the coil.

Thus concludes this session of linear electrical motor theory.
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