Equivalent Circuits for Single-Sided Linear Induction Motors
Equivalent Circuits for Single-Sided Linear Induction Motors
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DOI：
10.1109/tia.2010.2073434
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发表时间：
2010-11-01
影响因子：
4.4
通讯作者：
Li, Yongjian
中科院分区：
文献类型：
--
作者：
Xu, Wei;Zhu, Jian Guo;Li, Yongjian
单边直线感应电动机（SLIM）近来已应用于运输系统牵引驱动器中，特别是在中速范围中。这是因为它们具有优点，例如能够在没有机械接触的情况下对次级施加推力，高加速度或减速度，车轮磨损少，转弯半径小，以及灵活的道路线。这些机器的工作原理可以直接从旋转感应电动机（RIM）中推导出来。然而，虽然切开的初级磁路具有RIM等效电路的许多固有特性，但涉及横向边缘和纵向端部效应以及初级端部的半填充槽的几个问题需要研究。在本文中，提出了一种T型等效电路，它是基于一维磁方程的空气间隙，其中半充满槽被认为是由一个等效极数。在一次电阻、一次漏感、互感、二次电阻、二次电感这五个主要参数中，互感和二次电阻受边缘和端部效应的影响很大，可以通过四个相关系数进行修正，即，K-r、K-x、C-r和C-x。此外，两个轴等效电路（dq或α β）根据T模型等效电路得到使用功率转换规则，这是类似的RIM在两个轴坐标系。这四个系数可以用来分析直线感应电动机的动态性能，特别是互感和二次电阻。实验验证表明，T模型和新的双轴电路都能合理地描述直线感应电机的稳态和动态性能。这两个模型可以为直线感应电机的电磁设计和控制方案的实施提供很好的指导。
Single-sided linear induction motors (SLIMs) have lately been applied in transportation system traction drives, particularly in the intermediate speed range. This is because they have merits, such as the ability to exert thrust on the secondary without mechanical contact, high acceleration or deceleration, less wheel wear, small turning circle radius, and flexible road line. The theory of operation for these machines can be directly derived from rotary induction motors (RIMs). However, while the cut-open primary magnetic circuit has many inherent characteristics of the RIM equivalent circuits, several issues involving the transversal edge and longitudinal end effects and the half-filled slots at the primary ends need to be investigated. In this paper, a T-model equivalent circuit is proposed which is based on the 1-D magnetic equations of the air gap, where half-filled slots are considered by an equivalent pole number. Among the main five parameters, namely, the primary resistance, primary leakage inductance, mutual inductance, secondary resistance, and secondary inductance, the mutual inductance and the secondary resistance are influenced by the edge and end effects greatly, which can be revised by four relative coefficients, i.e., K-r, K-x, C-r, and C-x. Moreover, two-axis equivalent circuits (dq or alpha beta) according to the T-model equivalent circuit are obtained using the power conversion rule, which are analogous with those of the RIM in a two-axis coordinate system. The linear induction motor dynamic performance, particularly the mutual inductance and the secondary resistance, can be analyzed by the four coefficients. Experimental verification indicates that both the T-model and the new two-axis circuits are reasonable for describing the steady and dynamic performance of the SLIM. These two models can provide good guidance for the electromagnetic design and control scheme implementation for SLIM applications.