Analysis Method for Magnetic Field Strength on On-Board Antenna due to Inverter Common-Mode Noise at Whole Train Level

In order to reduce malfunctions of on-board equipment due to noise generated by inverters in rolling stock, a method for analyzing magnetic field noise received by on-board equipment is required. To achieve this, it was necessary to identify the main currents among the noise currents flowing near the onboard antenna and to construct a model that takes into account the phase of those currents. In the work reported here, we identified that the imbalance between the left and right rail currents contributes to the magnetic field noise and constructed a vehicle-level analysis model that includes these noise currents. The analysis confirmed that the model can represent the variation of noise fluctuation for each frame structure around the on-board equipment up to 2 MHz.