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The normal current carrying capacity is 6 amps per square millimeter without any cooling with forced cooling the number can be as high as 30 amps per square millimeter and for a motor application this means 5 times the energy density so a typical 1 or 2 KW/Kg energy density is now 5 to 10 KW/Kg in a continuous operation and peak values can be 10 times for a min or 20 times for a few seconds. The limiting factor is the thermal effects and how you deal with them the more efficient the heat removal the higher the allowed level of current.

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15y ago

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