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Analyze the asynchronous motor with finite element method

[note that the contact part should be wiped clean] this paper expounds the finite element method and Newton iterative algorithm, establishes the finite element magnetic field model of the motor, and analyzes the performance of the asynchronous motor, which is verified on the actual motor. Key words: finite element method; Asynchronous motor; Newton iterative method 1. Introduction

it is not uncommon for electrical workers to reduce the problem of distributed parameter system to the problem of centralized parameter system. Finite element numerical solution is the same thinking method. However, after the advent of finite element, it is far less fully applied in the electrical industry than in the field of mechanics

The characteristic of finite element method is that it is suitable for solving various forms (geometric, physical) complex problems, with high accuracy, strong versatility, thorough and systematic treatment of problems, and is suitable for the use of electronic computers. It is originally the solution of linear problems, but it can also skillfully solve nonlinear problems through iterative methods (such as the Newton Lapson iterative method of our company's single column tensile machine for small volume and small tensile force of cow samples). It is far superior to the graphic method and electrolytic cell method commonly used in the electrical industry to solve electromagnetic field problems in the next three years. Therefore, with the development of science and technology, the development of all kinds of electrical products with ultra-high voltage, large capacity and high precision, and the accurate calculation of its magnetic field are directly related to the excellent performance and technical and economic indicators of the product. Finite element method, a powerful tool, is more and more widely used to complete experiments automatically in the electrical industry and in the field of electromagnetic research; Extensive applicationthe method of analyzing the performance of asynchronous motor by finite element method has been verified in actual motor products. In the magnetic field, the curl of vector field function B: (1) it is usually described by vector bit a, that is, (2) then the basic equation of the magnetic field (3) where B - magnetic induction intensity

μ—— Dielectric constant

j - current density

cuts a cross section from the motor, where the magnetic field can be regarded as a parallel plane field

set the selected coordinates so that the components of B and a in the z-axis direction are zero, and the vector magnetic potential A and current density vector J have only the components in the z-axis direction, so that the magnetic resistivity, so equation (3) is transformed into a two-dimensional form

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