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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Prove your "fact" please. posted by cheap-Jack on November 7, 2006 at 13:15:30:
Copper resistivity at around room temperature increases by .4% per degree C.For an increase of 200 C to a temp of 230 C, multiply 200 times .4%...
.4% = .004
200 * .004 = .8, or 80% increase.
Close enough to being "double"?
cj: ""
FIY, most if not all speaker voice coils are wound with enamel coated
magnet wires. These tiny wires are normally rated their breakdown voltage min 4275V (typcially up to 10,000V) at 200C. ""Your statement on breakdown voltage has nothing to do with the topic.
The primary failure mechanisms for voice coils are physical.
The copper heats up so much that the "glue" is taken above it's failure temperature. If epoxy is used, that is the glass transition temperature, or sometimes called heat distortion temp. It is the temperature where a "phase change" of sorts occurs, and the epoxy loses strength.
Polyimide is being used more and more (kapton formers and the such), so that failure temperature is higher nowadays.Other probs such as bottoming out, I leave alone as not on topic either.
Cheers, John
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Follow Ups
- Tom is correct on that point. - jneutron 14:02:01 11/07/06 (0)
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