Low-frequency method of moment for field-line coupling analysis of electric vehicle cables

With the rapid development of electric vehicles, more and more complex cables are placed closely in the vehicle to connect all kinds of communication devices. However, both electromagnetic environments outside and inside the vehicle may have a significant impact on the performance of cables and, seriously, may harm the basic function of devices. Therefore, it is crucial to analyze the field-line coupling for vehicle cables in the design of vehicle electric facilities. In this paper, the problem of field-line coupling of vehicle cables is divided into two computation processes. The first process is to calculate the scattering characteristic of the vehicle using a full wave numerical method under a complex electromagnetic environment. In this process, the Augmented Electric Field Integral Equation (A-EFIE), as a general low-frequency Moment Method, is used to compute the Car’s near-field distribution and current distribution. Additionally, the Fast Accelerated Cartesian Expansion Algorithm (ACE) is used to accelerate the low-frequency algorithm and reduce the memory consumption of the computer. The second process uses the semi-analytical method to calculate the electromagnetic performance of cables influenced by the Car’s radiation field. Baum-Liu-Tesche (BLT) equations, wildly used in electromagnetic coupling analysis, couple the Car’s near-field as a distributed source to cables and calculate the cable’s terminal response characteristic, such as voltage and current. Finally, compared with business software, this method is verified and corrected, is even faster, and has less memory consumption than FEKO.