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摘要
In view of the deficiency of the research on the temperature rise and rotor thermal stress of the double-skewed rotor variable frequency induction motor, the distribution law of the temperature rise and rotor thermal stress of the double-skewed rotor induction motor under the power supply of the inverter are studied. The electromagnetic loss under inverter power supply mode is calculated by using the 3D finite element method combined with the improved iron loss model. Taking the 3D electromagnetic field loss density as the load and applying it to the 3D temperature field model as the heat source, the transient temperature change process of the motor under the inverter power supply mode is simulated, and the temperature rise curve of the motor shell and the temperature distribution of each part of the motor are obtained, and the accuracy of the simulation calculation results is verified by the temperature rise experiment of the prototype. Finally, the thermal stress distribution of the double-skewed rotor squirrel cage was obtained by taking the calculation result of the temperature field as the load and applying the corresponding constraints. The position where the squirrel cage of the double-skewed rotor is easy to break is pointed out, and some useful conclusions are drawn. The cause of the broken bars of the double-skewed rotor is improved and an important reference for the thermal optimization design of the double-skewed rotor is provided. ? 2023 Authors.
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