Electromagnetism-thermal Numerical Calculation And Investigation For Permanent Magnet Synchronous Motor

Due to the advantages of high efficiency, small volume, flexible and varied structure, the permanent magnet synchronous motor(PMSM) has been widely used in the production and living, which is gradually replacing the traditional motor. The power density of PMSM tends to improve constantly owing to the need of applicable situation. It makes a higher requirement for achieving the situations of reducing loss,improving heat resisting and deformation resisting ability of material to motor correspondingly. To ensure the stable operation of motor, it needs to avoid the permanent magnet demagnetization and mechanical fault of structural component.The multiple physical fields simulation and analysis are indispensable. Therefore, it is quite necessary to study on the loss distribution, heat transfer rule and deformation characteristic of the motor.A permanent magnet synchronous motor was used as the research object in this paper. By adopting the finite element method(FEM), the numerical calculation and investigation of electromagnetic field, temperature field and thermal stress for motor with inverter power supply were taken in steady-state operation. With the help of parametric equivalent method for skewed slot, the two-dimensional model of PMSM was simulated and solved in electromagnetic field calculation. The common solution model and mesh element in the three-dimensional full region which contained the complex heat dissipation structure for temperature field and thermal stress investigation was established. It could achieve an accurate solution by the coupling calculation of them. Based on this method, the loss distribution, the temperature rise distribution and heat transfer rule, the characteristic of thermal deformation which were produced by each part of motor were obtained and analyzed detailedly. At the same time, through the way of using experimental test for motor, the collected dataand simulation result were comparatively analyzed, which verified the accuracy of the research method and calculation result. The research in this paper can provide a certain reference for the motor design, performance optimization and fault prediction.