Coil design
A percent or two resistance could be caused by difference in winding tension which can actually stretch small gauge copper wire reducing its diameter increasing its resistance.
Also, temperature has a large influence on copper resistivity. Variation in ambient from morning to afternoon can easily account for several percent change in resistance.
A coil's resistance will often be 30 to 40% higher at temperature associated with rated load operation versus cold ambient room temperature. All this fuss adjusting coil parameters at room temperature won't apply at working conditions, will it?
While I'm on the subject, I read over some of N. Tesla's work on bifilar coils. But I could not easily find instance where he addressed multi-filar, meaning more than the two conductors side-by-side in the coil. Can anybody provide a reference for me?
Regards,
bi
Originally posted by Turion
Also, temperature has a large influence on copper resistivity. Variation in ambient from morning to afternoon can easily account for several percent change in resistance.
A coil's resistance will often be 30 to 40% higher at temperature associated with rated load operation versus cold ambient room temperature. All this fuss adjusting coil parameters at room temperature won't apply at working conditions, will it?
While I'm on the subject, I read over some of N. Tesla's work on bifilar coils. But I could not easily find instance where he addressed multi-filar, meaning more than the two conductors side-by-side in the coil. Can anybody provide a reference for me?
Regards,
bi
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