Multi-objective Optimization Design of Permanent Magnet Synchronous Motor Based on Magnetic-structural Coupled Vibration
A permanent magnet synchronous motor(PMSM)with a large ratio of axial and radial dimensions as well as fractional-slot concentrated windings for mining coalbed methane is proposed.When designing the motor,an analysis method of magnetic-structural coupled is used to suppress the over-deformation risk of electromagnetic vibration due to the large ratio of axial and radial dimensions.The shoulder height of the stator,the slot opening,the pole arc coefficient,the PM thickness,and the reduction of the PM edge are selected as the influencing factors,and the torque,the efficiency,and the torque ripple are selected as the optimization objectives,a combined method of Taguchi and response surface method(RSM)is used to optimize the motor.Firstly,the optimization range of the shoulder height of the stator is determined according to the vibration characteristic of the magnetic-structural coupled finite element(FE)simulation.Secondly,an orthogonal experimental table is built by using the Taguchi method,each experiment in the table is carried out using FE simulation,and the effects on the optimization objectives of each influencing factor are analyzed to determine the values of the PM thickness,the pole arc coefficient,and the slot openings.Thirdly,the motor is further optimized using RSM to determine the values of the shoulder height of the stator and the reduction of the PM edge,then,the final optimization scheme is determined.FE results show that the overall performance of the optimized motor is improved significantly,and the deformation of electromagnetic vibration is also suppressed.
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