六极异极性径向永磁偏置磁悬浮轴承的研究

Research on Six Magnetic Poles Heteropolar Radial Permanent Magnet Biased Magnetic Bearing

研究了一种六极异极性径向永磁偏置磁悬浮轴承,介绍了其结构及工作原理。通过坐标变换的方法将径向的悬浮力解耦,并推导了它与电流以及位移之间的函数关系。提出了根据各方向最小承载力最大来设计该磁悬浮轴承偏置磁场的原则。通过电磁场有限元软件对该磁悬浮轴承的悬浮力进行了仿真验算,仿真结果表明,在一定范围内x、y方向的悬浮力具有较好的线性特征,x方向的线性范围大于y方向的线性范围。仿真结果与计算结果的对比表明,按照等效磁路法计算出的电流刚度与仿真结果较为接近,平均误差小于3%,而位移刚度则略大于仿真结果。

The configuration and working principle of an innovative six magnetic poles heteropolar radial permanent magnet biased magnetic bearing were introduced. Based on coordinate transforma- tion method,the mathematical models of the suspension forces were deduced. A design principle of bi- as magnetic field based on maximization of bearing capacity in different directions was presented. The results of finite element simulation and theoretical calculations were compared to analyze the influence of the rotor position and control current. The results show that the levitation force has good linearity in the 3c and y directions, and the linear range in the a： direction is larger. The current stiffness error between theoretical calculation and finite--element simulation is less than 3%, while the displacement stiffness error is much larger.