A Finite Element Thermal Analysis Method of Motor Using the Minimum Symmetrical Element of Stator and Rotor as Geometric Model
A geometric model and finite element technology, applied in the field of finite element thermal analysis, to achieve the effect of simplifying calculation, increasing calculation speed, and reducing the number of meshes
Active Publication Date: 2018-07-20
SOUTHEAST UNIV
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[0003] However, when using the existing finite element thermal analysis model for temperature field modeling, the problem of different symmetry of the stator and rotor cannot be well solved. When performing finite element modeling, the stator and rotor must be analyzed with the same ratio of stator and rotor elements. Due to the 3D characteristics of the temperature field, a larger number of subdivided grids is often required for calculation
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[0039] The present invention will be further explained below in conjunction with the accompanying drawings.
[0040] This embodiment takes figure 1 The shown 12 / 10 pole permanent magnet flux switching motor is taken as an example to further illustrate the method. where θ 1 equal to 36°, θ 2 It is equal to 30°. The rotor is made of laminated silicon steel sheets. Its thermal conductivity in the direction parallel to the cross section is 46W / (m·℃), and the thermal conductivity in the direction perpendicular to the cross section is 1.0W / (m·℃). The thermal conductivity of the silicon steel sheet on the stator is the same as that on the rotor, the thermal conductivity of the permanent magnet on the stator side is 9W / (m·℃), and the thermal conductivity of the winding in the direction parallel to the section is 0.5W / (m·℃) perpendicular to the section The thermal conductivity in the direction was 200 W / (m·°C). Symmetric boundary conditions are set on the boundaries 11, 13, 14-17 t...
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The invention discloses a finite element thermal analysis method for a motor using a stator and rotor minimum symmetry element as a geometric model. Temperature field finite element calculation is performed by adding air gap nodes in an air gap of the stator and rotor minimum symmetry element, and using an asymmetric air gap boundary convection stiffness matrix to link a boundary in the air gap of the stator and rotor minimum symmetry element with the added air gap nodes based on a principle of conservation of energy; therefore, a stator and a rotor can be calculated by taking the minimum symmetry element, thus modeling of a stator and rotor real geometric model can be realized, subdivision grid numbers can be reduced to a maximum extent, the calculation can be simplified, and the calculation speed can be improved. For instance, when thermal analysis is performed on a 12 / 10 pole permanent magnet flux switching motor by using a common finite element method, at least 1 / 2 of the rotor and 1 / 2 of the stator are used for modeling analysis; however, by adopting the method of the invention, only 1 / 12 of the stator and 1 / 10 of the rotor are used for analysis.
Description
technical field [0001] The invention relates to the field of finite element thermal analysis, in particular to a method for dealing with different symmetries of stators and rotors in the finite element thermal analysis of electric motors. Background technique [0002] With the intensification of the energy crisis, the society's demand for high-efficiency and low-cost motors continues to increase. Accurate motor design not only needs to calculate the electromagnetic performance of the motor, but also needs to accurately calculate the temperature rise of the motor during operation to ensure its safe operation. The traditional motor temperature rise calculation is mainly based on the thermal circuit method. This method usually only calculates the average temperature rise of the winding, and the establishment of the thermal circuit model and the calibration of parameters need to be combined with experiments. With the appearance of the finite element method and the rapid develop...
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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 程明朱洒蔡秀花
Owner SOUTHEAST UNIV