General Design Methods for Electromagnetic Products
Release time:
2023-11-02
In the design of electromagnetic products, it is inevitable to use some analysis methods and tools of electromagnetic theory. Both the electric field and the magnetic field are still based on Maxwell's equations. The classical analytic algorithm of Maxwell's equations can be used to describe any point of the electromagnetic field, so the whole field characteristics can be described theoretically. But in practice we cannot and cannot replace the description of the entire field with a finite number of points. Therefore, for this embarrassing situation, modern mathematics has developed a finite element algorithm. The finite element algorithm is an approximate engineering algorithm. The general idea is to divide the overall calculation object into a limited number of small areas, and assume that the physical properties of a point in each small area are the physical properties of the area, and then use the superposition principle to sum all small areas, thus approximating the overall physical properties. This is very similar to the classical calculus principle. Even so, manual calculation is almost impossible. Computer-aided computing has become an important solution to such problems. Many countries have developed their own electromagnetic finite element analysis software.
In the design of electromagnetic products, it is inevitable to use some analysis methods and tools of electromagnetic theory. Both the electric field and the magnetic field are still based on Maxwell's equations. The classical analytic algorithm of Maxwell's equations can be used to describe any point of the electromagnetic field, so the whole field characteristics can be described theoretically. But in practice we cannot and cannot replace the description of the entire field with a finite number of points. Therefore, for this embarrassing situation, modern mathematics has developed a finite element algorithm. The finite element algorithm is an approximate engineering algorithm. The general idea is to divide the overall calculation object into a limited number of small areas, and assume that the physical properties of a point in each small area are the physical properties of the area, and then use the superposition principle to sum all small areas, thus approximating the overall physical properties. This is very similar to the classical calculus principle. Even so, manual calculation is almost impossible. Computer-aided computing has become an important solution to such problems. Many countries have developed their own electromagnetic finite element analysis software.
Here are some excellent electromagnetic analysis software:
Magnet, Elecnet, etc. developed by (I) Canadian Infolytica Company;
(II) Maxwell developed by Ansoft Corporation (acquired by Ansys)
(III) Opera, developed by Cobham Technical Services, UK
These professional softwares are all based on finite element analysis and have powerful functions. They all have 2D and 3D analysis functions. The usage methods are also similar. There are steps such as modeling, meshing, filling materials (magnetic, electrical and thermal characteristics), filling media (magnetic, electrical and thermal characteristics), calculation output results, sorting and visualization of results, etc. The calculation speed and calculation accuracy are also different due to the difference of the algorithm.
When using software for finite element analysis, modeling methods, meshing, mastery of material properties, and computer hardware configuration can affect the final result and accuracy of the calculation. Therefore, we rarely use finite element analysis, unless the design of specific or special requirements for such analysis, the analysis results are only for reference. Most products are designed using more conservative empirical design, or physical and experimental methods are constantly revised. We still need to improve the design method of electromagnetic products, and welcome interested friends to put forward their opinions or discuss them together. Look forward to your contact with us!
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