In order to solve the problem that the traditional motor temperature monitoring method is difficult to monitor the motor interior,a motor magnetothermal coupling model is established.Based on this,a reduced-order-model(ROM)of motor temperature field oriented to digital twin is estab-lished.Taking a 3kw induction motor as an example,the 2D electromagnetic field model of the motor is established first,and the loss under rated working conditions is analyzed by simulation.Secondly,the 3D motor model of the motor is built,and the heat source of the temperature field is determined by the loss results of the electromagnetic field model.Moreover,the temperature field cloud image of the mo-tor under rated working conditions is analyzed by simulation,and the comparison with the traditional thermal loop method is made to verify the relative accuracy of the finite element method.Finally,based on the motor state under different working conditions and POD algorithm based on SVD decomposition,a reduced order model of the motor temperature field is obtained.The calculation time is reduced from hours to seconds,and the accuracy of the reduced order model is verified by comparing with the original model.
关键词
数字孪生/感应电机/有限元/磁热耦合/降阶模型
Key words
digital twin/induction motor/finite element/magnetothermal coupling/reduced-order-model
维普
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