1. Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education Harbin University of Science and Technology Harbin 150080 China; 2. State Key Laboratory Breeding Base of Dielectrics Engineering Harbin 150080 China; 3. Shanghai Electrical Cable Research Institute Co. Ltd Shanghai 200093 China
Abstract：In order to improve the efficiency of power transmission in the wireless power transmission system and reduce the resistance loss caused by the high frequency current skin effect and the proximity effect, in this paper, the resistance calculation model for the double-layer composite copper clad aluminium (CCA) wire is established, and the changing law of the electromagnetic field inside the wire is also analyzed. At the same time, the analytical expressions of the AC resistance generated by the skin effect and the proximity effect are obtained in combination with the electromagnetic field boundary conditions. It is found that under the influence of high frequency skin effect, the CCA wire with smaller volume fraction has a larger resistance. As the frequency increases, the skin effect is enhanced, and the resistance values of CCA wires with different volume fractions will tend to be consistent. Under the influence of external alternating magnetic field, when the frequency is lower, eddy current loss density within pure copper wire is higher, and the resistance of pure copper wire is greater than that of CCA wire. With the continuous increase of frequency, the eddy current loss density inside the CCA wire increases, whose resistance is greater than pure copper wire. The magnetic field strength distribution around CCA conductor is related to the wire and the magnetic field applied angle θ. With different θ (0°~360°), the magnetic field strength is distributed in a spiral way. Comparing the actual experimental curves of the high-frequency CCA coil resistance with the theoretical resistance calculation curves, the calculating results from analytical expressions are in accordance with the practical test results, which is valuable for the coil loss analysis in high-frequency CCA wire.
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2018, Vol. 33 
