Abstract
Summary In this paper, the electromagnetic efficiency factor is defined to describe the utilization rate of metal conductors in air-core coils. The geometry-electromagnetic character and the thermal condition of the coil are coupled to describe the electromagnetic efficiency of the air-core coils. The geometry-electromagnetic character is deduced form the inductance computation formula, while the thermal functions are given according to the “Uniformed electrical current density condition” and the “uniformed temperature rise” condition. Curves that reflect the electromagnetic efficiency factor are given while the thermal condition is considered as the mentioned two conditions. The former thermal condition is simpler and is proved to be suitable for midget air-core coils without complex heat transfer structure or coils with pulse current. While, the latter is proved to be with higher accuracy and can be wildly used in the optimization design of air-core power reactors. Copyright © 2014 John Wiley & Sons, Ltd.
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