Finite element analysis-based variable-element permanent magnet synchronous motor modeling method

Abstract

The invention relates to a finite element analysis-based variable-element permanent magnet synchronous motor modeling method which comprises the following steps of constructing a three-dimensional finite element electromagnetic field simulation model of a permanent magnet synchronous motor, and performing transient field road coupling analysis on the three-dimensional finite element electromagnetic field simulation model to obtain a large quantity of characteristic parameters; creating an improved permanent magnet synchronous motor voltage equation and a torque equation; constructing a simulation model of the permanent magnet synchronous motor according to an improved permanent magnet synchronous motor math model; leading all the obtained characteristic parameters into corresponding ports of the simulation model to construct a finite element analysis-based variable-element permanent magnet synchronous motor dynamic simulation model. The permanent magnet synchronous motor model modeled by the method disclosed by the invention comprehensively considers the magnetic field saturation effect, the d-q axis cross coupling effect, the eddy current effect, the hysteresis effect and the like; the instantaneity is considered, and the accuracy of the permanent magnet synchronous motor model is improved; the permanent magnet synchronous motor model is particularly suitable for the research on the dynamic processes such as power failure-bepelt and three-phase sudden short circuit of the permanent magnet synchronous motor.

Description

technical field [0001] The invention belongs to a modeling method of a motor, in particular to a modeling method of a variable parameter permanent magnet synchronous motor based on finite element analysis. Background technique [0002] Due to its small size, good performance, simple structure, high reliability, and large output torque, permanent magnet synchronous motors have received widespread attention, especially in robotics, aerospace, and precision electronic equipment that require motor performance and control accuracy. Higher application occasions and fields. The drive motors for large inertia loads such as high-speed rail locomotives, electric vehicles, and large-size propellers have also gradually developed from induction motors to permanent magnet synchronous motors. However, the dynamic processes of permanent magnet synchronous motors such as power failure-reintroduction, three-phase sudden short circuit, etc. are short in time, and the model and parameters chan...

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Problems solved by technology

The traditional d-q-axis magnetic circuit analysis model based on double-reaction theory has the characteristics of simple calculation and fast simulation speed, but it only considers the fundamental wave component of the motor inductance and air-gap flux linkage without considering the harmonic influence, and ignores the magnetic field saturation effect , cross coupling between d-q axes, eddy current loss and hysteresis loss, it is difficult to meet the needs of dynamic process analysis

The magnetic field analysis model completely adopts the finite element analysis method to calculate the electromagnetic field. Although the precise division of the grid can obtain a high-precision electromagnetic field model, the calculation amount is large and time-consuming, and it cannot be used for real-time control of the motor. The electromagnetic relationship between parameters is not clear enough, which is not conducive to research and analysis

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