Influence of the opening width of stator semi-closed slot and the dimension of the closed slot on the magnetic field distribution and temperature field of the permanent magnet synchronous motor

摘要

The structure of a permanent magnet synchronous motor (PMSM), more precisely, its shape and dimension of the stator slot can change the magnetic field distribution of the stator tooth and the yoke. In addition, it also affects the magnetic field distribution in the air-gap and the electrical loss in the rotor. As a result, there is an effect on the motor's internal temperature distribution. This study aims at investigating the influence of stator slot dimension on the performance of the motor. To this extent, a field-circuit coupled model combining the vector control strategy with motor finite element model is proposed. Based on this model, the impact of using various opening widths of semi-closed slot and the dimension of the closed slot on both magnetic field distribution and loss in the PMSM is studied in detail. Furthermore, by considering the calculated loss as a heat source, the temperature variation of the stator core, winding, magnetic bridge and permanent magnet of the motor for different scenarios of slot dimensions can be obtained by using a three-dimensional temperature field model at steady-state. An experimental platform is established to validate the model this provides a theoretical support for the analysis of the results.