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This paper proposes a new type of permanent magnet motor stator system equivalent model considering insulation materials and modal analysis is performed. First, the analytic method is used to estimate the modal natural frequency of the stator core and the stator winding system respectively, and the influence of the winding on the system modal is analyzed. Then, a new type of winding equivalent model was established using the finite element method (FEM), two traditional models were established at the same time. Compared with the traditional model, the new winding equivalent model considers the influence of insulating materials, so the calculation results are more accurate. At the same time, due to the innovative modeling of the new winding equivalent model, the Young’s modulus of the winding equivalent material is increased, which effectively reduces the appearance of useless local modes and improves the calculation efficiency.

A vehicle’s NVH performance has a significant impact on the user experience of the driver and passengers. About one-third of the vehicle complaints are related to NVH performance. As the core component of the vehicle, the drivetrain’s NVH characteristics have a significant impact on vehicle comfort. How to reliably and stably reproduce the specific condition of the whole vehicle through the test method, and obtain the highly consistent objective data for analyzing and improving the NVH characteristics of the drivetrain is of great significance in engineering. For this purpose, China Automotive Technology Research Center Co., Ltd. (CATARC) designed and built a new type drivetrain NVH test facility, which consists of five dynamometers, and can carry horizontal/vertical, front/rear drive or four-wheel drive structures including powertrain, transmission, and rear axle, or even a whole vehicle.