Characterization of magnetic-fluid-thermal coupling of 400 kW permanent magnet synchronous motor
In order to accurately analyze the temperature rise characteristics of the high-power permanent magnet synchronous motor during operation,a coupled magnetic-fluid-thermal multi-physical field analysis was carried out on a 400 kW,9 000 r/min high-power permanent magnet synchronous motor.Firstly,the motor structure was designed,and its no-load and load operating characteristics were analyzed.Secondly,the loss was loaded into the temperature field as a heat source,and the effect of the coolant in the cooling channel on the temperature of the motor was calculated by flow-heat coupling.Finally,considering the influence of the temperature characteristics of the motor material on the thermal performance,a two-way coupling method was proposed,in which the actual loss distribution of the motor magnetic field was loaded into the temperature field,and then the temperature variation of the winding and permanent magnet was inverted to the electromagnetic field.The coupling of the magnetic-fluid-thermal multi-physical fields of the motor was realized by the finite element method.The results show that under the two-way coupling method,the temperature rise of the winding and the permanent magnet are 6.27％and 2.27％higher than that of the one-way coupling,improving the accuracy of the loss and temperature rise calculation for this type of motor.
permanent magnet synchronous motormulti-physics couplingmagnetic field characteristicstemperature rise characteristics
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