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Registered Member #6038
Joined: Mon Aug 06 2012, 11:31AM
Location: Salado, TX
Posts: 248
At what primary current levels would one switch from 1/4" to 3/8" copper tubing to limit heating and other resistive losses? Assuming 80kHz Fres. Obviously 1/4" is cheaper and gives a tighter wound primary, but 3/8" is significantly larger circumference and hence greater conductivity given the small skin effect of copper. Is there a formula or rule of thumb folks use?
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Good question.
However, you cannot even go by copper OD diameters. There is a huge variation in the cross-sectional area of copper tubing of the same OD. Just Lowes itself sells 3/8" copper tubing with a variety of wall thicknesses, some which aren't even readily apparent. So wall thickness needs to be taken into account as well.
Generally, for small coils (say 1-2kW max, i'll use 1/4" OD copper), and then work my way up. Note, that for high power DRSSTCs, you may even need water cooling on the primary coils depending on the currents and duty cycles you are running.
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Primary copper tubing
