In the magnetothermal coupling calculation

the traditional numerical calculation method often faces the contradiction between computational accuracy and efficiency. Therefore

in view of the shortcomings of the traditional method in the high-frequency environment

a fast calculation method based on the reduced order model is proposed

namely

the proper orthogonal decomposition-radial basis function response surface method with linear terms including linear polynomial(POD-RBFLP); meanwhile

the response surface model between the modal coefficient and the working conditions is established

so that the temperature field distribution can be quickly obtained under different working conditions. This method is suitable for real-time online simulation applications by reducing the order while maintaining high calculation accuracy. In specific applications

the POD-RBFLP method is applied to high-frequency transformers

its temperature field is reduced

and the effectiveness of the method is verified by numerical calculation. The test of 50 sets of working conditions shows that the absolute error of the temperature field reduction model in the whole field is less than 5 ℃

the relative error is less than 3%

and the speed is increased by 337.44 times. The results show that the POD-RBFLP method has high accuracy and can be adopted to effectively improve the speed of temperature field calculation.