磁悬浮开关磁阻电机电磁力耦合特性的有限元分析

Finite-Element Analysis about Coupling Characteristics of Electromagnetic Force of a Bearingless Switched Reluctance Motor

以一台12/8结构的磁悬浮开关磁阻电机为对象,分析了悬浮力产生机理.借助有限元分析软件MAXWELL2D建立了实体仿真模型,分析了电磁力的耦合特性,包括悬浮力在径向两自由度上的耦合特性、悬浮力和转矩的耦合特性以及转子径向位移对电磁力耦舍的影响.分析结果表明,悬浮力的径向耦合主要体现在定转子齿极交叠初期,悬浮力和转矩的耦合主要表现为转矩调节对悬浮力的影响,径向位移的出现在一定程度上影响了悬浮力的径向耦合关系.这些结论为电机优化设计、数学模型研究及解耦控制算法的设计提供了有益的参考.

A bearingless switched reluctance motor of 12/8 structure was used to explain the production principle of suspending force. A finite-element simulation model of the sample motor was established and coupling characteristics of electromagnetic forces were analyzed by MAXWELL2D, including radial coupling characteristics of suspending force on two degrees of freedom, coupling characteristics between suspending force and electromagnetic torque. Moreover, the effects on coupling of electromagnetic forces caused by radial displacement of the rotor were also analyzed. The analysis results show that the radial coupling of suspending forces mainly appears at initial overlapping positions; the coupling effects of torque adjustment on suspending force is the main factor in coupling characteristics between suspending force and electromagnetic torque and the radial displacement can affect the radial coupling of suspending forces to a certain extent. The results can provide useful references for motor＇s optimization design, mathematical model research and decoupling control design.