نبذة مختصرة : The high-power direct drive permanent magnet synchronous motor (DD-PMSM) has become a hotspot because of its excellent performance compared to the asynchronous motor. Due to limitations like suspension structure and field clearance, the bottom of the windings is closer to the rail surface in a direct drive system under the same power load, which causes more disturbance energy coupling into the track circuit equipment in the form of magnetic field radiation than that of the asynchronous motor. Therefore, it may cause a wrong decision on track occupancy if the disturbance falls into the sensitive frequency band, leading to signaling failure. This paper first studied the magnetic field radiation from DD-PMSM and its influence on adjacent devices and determined the disturbance coupling path between the motor and the track circuit. Next, the calculation and analysis are accomplished on the radiated magnetic field and electromotive force disturbance. Then the FEM model is established for simulation and verification. Finally, engineering verification is carried out by the field test data to prove the validity of the theoretical model. This research helps to improve the EMC of locomotive and signaling systems, as well as mitigate signaling faults and safety risks.
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