电主轴用电磁式主动平衡装置启动磁场仿真分析

为了有效抑制机床电主轴在加工过程中的实时质量不平衡,提出了一种含永磁体的电磁式在线主动平衡装置结构。在进行该平衡装置电磁设计时,启动磁场设计是否合理至关重要。根据平衡装置结构特点,采用二维简化模型,以磁场分布云图和磁通密度大小为主要指标,对磁源和气隙的影响规律进行了详细研究。根据有限元仿真分析结果,驱动电流、磁体和空气隙是启动磁场设计的敏感参数,特别是驱动电流、磁体长径比和磁体与磁性齿之间的空气隙对启动磁场的影响较大,在设计中需要根据有限元仿真的结果进行优化选择。

Simulation and analysis on starting magnetic field of electromagnetic active balancing device for motorized spindle

In order to effectively reduce the real-time mass unbalance of motorized spindle during operation, the electromagnetic online active balancing device with permanent magnet was proposed. In designing the balancer, the starting magnetic field is important. According to the balancer structure feature, the two-dimension simplified model is applied and the magnetic field distribution and flux density are the evaluation indexes. This paper studies the rule about the influence of magnetic source and air gap on the starting magnetic field. The results show that the driving current, permanent magnet and air gap are the main sensitive parameters, and the current value, magnet size and gap value between magnet and magnetic tooth have the great effect, which should be finally chosen according to the finite element analysis results.