324 / 2021-04-30 22:22:31

Multi physical field coupling analysis of electromagnetic vibration and noise of Fe Co based permanent magnet motor for electric vehicle

FeCo based permanent magnet synchronous motor,radial electromagnetic force,vibration and noise,modal analysis,finite element method analytic method(FEM)

Aiming at the problem of improving the NVH performance of new energy vehicle motors, it is proposed that the level of electromagnetic vibration and noise of the motor directly affects the NVH performance of new energy vehicles. Based on the theory of Maxwell's stress equation, the analytical expression of the electromagnetic force of permanent magnet synchronous motors is deduced. It is concluded that the electromagnetic noise of the motor mainly comes from the radial electromagnetic force of the stator teeth of the motor, and the finite element multiphysics coupling method is used to verify the correctness of the analytical calculation. Based on the derived analytical expression of the radial electromagnetic force, the source of the radial electromagnetic force of each order and frequency of the permanent magnet motor is summarized. Taking a 12-slot 8-pole new energy electric vehicle driving a permanent magnet motor as an example, the establishment Considering the space distribution of the radial electromagnetic force of the motor and the simulation calculation model of the electromagnetic vibration of the iron-cobalt-based stator, the electromagnetic vibration resonance of the motor is analyzed, and the modal analysis is performed. The optimization of the iron-cobalt-based permanent magnet drive motor under the rated load is given. After the acceleration, vibration and noise waterfall chart.