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Ford 9N, 2N & 8N Discussion Forum
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Another Coil Ponder

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The Yank

01-09-2005 13:01:51




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Here's another one to ponder! I work at a company that makes sensors. Most of the designs are just a coil of wire wound around a magnet.

When we setup production to do a new coil design we have to validate how it is made. Typically we put a couple of hundred coils in a machine that cycles from -40C to +150C. Thermal shock stress test.

The mechanical moving of the coil guts when going hot and cold can cause insulation to break down or wires to break. We usually test for 150 cycles. Poor designs usually show up with failures in the first 8 to 10 cycles.

If ya don't ever leave the key on why would a coil ever fail? Poor design?

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Rob N VA

01-09-2005 19:26:11




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 Re: Another Coil Ponder in reply to The Yank, 01-09-2005 13:01:51  
Age? More than 150 cycles? just guessing, not trying to be a smart-@ss



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