【摘要】 针对数控机床进给平台存在的摩擦问题,提出一种基于混合励磁直线同步电机的新型磁悬浮进给平台的结构及运行原理。该磁悬浮进给平台推进系统和悬浮系统共用一个气隙磁场,电磁推力和法向力存在磁力耦合现象。对混合励磁直线同步电机的电磁推力和法向力进行了数值分析及有限元验证;建立了系统相应的状态方程和输出方程,并对系统进行了解耦控制。仿真结果证明:采用输入变换结合状态反馈可以实现电磁推力和法向力的完全解耦,有利于提高进给平台运动的平稳性及定位精度。更多还原

【Abstract】 Aiming at the problem of frictional resistance existed in feeding platforms of NC machine tools,the structure and operating principle of a novel magnetic levitation feeding platform based on the hybrid excited linear synchronous motor( HELSM) are proposed in this paper. There is magnetic force coupling between the electromagnetic thrust and the normal force,because the driving system and levitation system share a common airgap magnetic field. The numerical analysis and finite element validation to the electromagnetic thrust and normal force of the HELSM are run. The correlative state equation and output equation of the system are established and the decoupling control is run. The result shows that the electromagnetic thrust and normal force can be completely decoupled after applying state feedback and input transformation. This study will be useful to improve the stability and positioning accuracy to the feeding platform.更多还原