液浮陀螺电磁场有限元分析

Finite element analysis of electromagnetic field in floated gyro

针对液浮陀螺的永磁陀螺电机漏磁场可能造成陀螺噪声大的问题,需首先搞清永磁陀螺电机的漏磁场量值及分布以及与之可能产生耦合力矩的力矩器端部漏磁的量值及分布。用有限元软件ANSYS对其内部主要电磁元件进行了三维有限元数值计算,得出这些元件的气隙磁密分布图和它们的漏磁形式及大小;分析得出陀螺电机的外圆柱面和力矩器端部存在着较大漏磁,两者存在着磁场的耦合作用。在设计中应对陀螺电机的外圆柱面和力矩器的端部施加磁屏蔽。

Since strong noises of floated gyro might be caused by permanent-magnetic gyro-motor, the paper analyzes the magnitude and formation of magnetic flux leakage of gyro-motor and the torquer. Finite element software ANSYS is used to calculate the main electromagnetic components by three-dimensional finite element numerical calculation. The air-gap flux density distribution pictures, the magnetic leakage form and size of these components are gained as well. Finally, the analysis results indicate that the cylindrical exterior of gyro motor and cylindrical end of torquer have large magnetic leakage, and the magnetic field coupling is existed between them. Hence magnetic shielding should be exerted to the cylinder exterior of the gyro motor and the cylindrical ends of torquer in the design.