Abstract: The high-power permanent magnet synchronous motor (PMSM) armature winding current used for compressors is large, which is easy to cause the problems of critical heating and high temperature at the winding end. To solve this problem, a compressor with a 560kW PMSM was used as an example. A three-dimensional global fluid-solid coupling heat transfer model was established. Based on the Mosaic grid discretization, rotor rotation was taken into account. The thermal coupling field of PMSM global flow under the action of cooling medium turbulence was numerically calculated. The cooling medium flow law of the motor and the thermal characterization of the armature winding under different inlet wind speeds were analyzed. The temperature test of the stator end windings of the prototype under different armature currents was carried out and compared with the theoretical analysis results. The rationality of the 3D fluid-solid coupling heat transfer model of permanent magnet motor and the correctness of the calculation method were verified. This paper provides a theoretical reference for the heating and cooling design of permanent magnet synchronous motors for compressors.