In HEVs (Hybrid Electric Vehicles) and EVs (Electric Vehicles), rather high voltage and current are used for the power train. Specifically, the frequency of inverter output current is in the kHz-range, and high-frequency effects (Skin effect & Proximity effect) appear in conductors (harnesses or bus-bars). These effects are phenomena particular to alternating current. The skin effect is a phenomenon in which flowing current concentrates near the surface of the conductor, while the proximity effect occurs in a way that the current paths are attracted or repelled mutually by the interaction between currents flowing in the individual conductors. Both effects appear noticeably at high-frequencies, increasing the impedance of the conductors. Harness design that takes into account these high-frequency effects is more important than ever. The distributions of current density and magnetic flux density of conductors were computed using the numerical analysis of magnetic fields and eddy-currents based on the finite element method (FEM) in frequency domain. The impedance of conductors with circular and rectangular cross-section, such as resistance R and self-inductance L, was calculated using applied voltage and resultant current based on the distribution of current density. And accuracy of the FEM was verified by comparing with theoretical or experimental results. Calculated results of the impedance for different cross-sections and various layouts of conductors applicable to actual EV are compared. And then, the impedance of conductors hooked up a load (motor) was calculated and the difference between with load and without load was discussed.
A consideration of high-frequency effects on power harnesses for hybrid electric vehicles
EVS, Electric Vehicle Symposium, 26 ; 2014-2025
2012
12 Seiten, 25 Bilder, 12 Tabellen, 10 Quellen
Aufsatz (Konferenz)
Englisch
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