Investigation of Forces in Linear Induction Motor Under Different Slip Frequency for Low-Speed Maglev Application
Investigation of Forces in Linear Induction Motor Under Different Slip Frequency for Low-Speed Maglev Application
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DOI：
10.1109/tec.2012.2227114
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发表时间：
2013-03
影响因子：
4.9
通讯作者：
Q. Lu;Yanxin Li;Y. Ye;Z. Zhu
中科院分区：
文献类型：
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作者：
Q. Lu;Yanxin Li;Y. Ye;Z. Zhu
低速磁悬浮列车中使用的直线感应电动机除了产生驱动列车运行的推力外，还产生影响悬浮系统的法向力。采用三种有限元模型研究了不同滑移频率下二次铝板的横向边效应、纵向端效应、横向边形及其温度等因素对受力性能的影响。对于横向边缘效应，证明了一种精确的修正因子比普通的罗素因子和诺斯沃西因子更合适。在现有非铁磁二次LIM模型的基础上，改进了等效电路模型的分析方法。修正考虑了一次铁损、二次背铁涡流和法向力的计算。在此等效电路模型的基础上，得到了给定滑移频率和推力条件下，推力、法向力、效率和功率因数随列车速度的变化曲线。还研究了横向边缘、纵向末端和气隙长度的影响。通过有限元模型和实测验证了分析预测结果。
The linear induction motor (LIM) applied in low-speed Maglev train produces not only the thrust force to drive the train, but also the normal force that affects the levitation system. Three finite element models are employed to investigate the influence of transverse edge effect, longitudinal end effect, transverse edge shape of secondary aluminum plate and its temperature, etc., on the force performance under different slip frequency. For the transverse edge effect, a precise correction factor is proved to be more suitable than the common Russell and Norsworthy's factor. An analytical method using an equivalent circuit model is improved based on an existing model for nonferromagnetic secondary LIM. The amendments account for the primary iron loss, the eddy current of secondary back iron, and the calculation of normal force. Based on this equivalent circuit model, the performance curves of thrust force, normal force, efficiency, and power factor against the train velocity are obtained for given slip frequency and thrust force. The influences of transverse edge, longitudinal end, and air gap length are also investigated. Analytically predicted results are validated by finite element models and measurements.