Abstract

The linear induction motors, due to their unique features, utilize in various applications. The most crucial drawback of the linear induction motors is the large air gap between secondary and primary. This problem deteriorates the performance of linear induction motor, increases power loss, and causes to low efficiency. In this paper, a novel structure of single-sided linear induction motor is proposed to reduce the magnetic air gap. This structure consists of ladder-slit sheets and salient back iron for secondary of single-sided linear induction motor. The salient parts of back iron fill the slits of sheet, and therefore, the effective magnetic air gap can be decreased owing to partial form. Also, the electromagnetic aspects of the proposed secondary such as z-component of air gap flux density, y-component of aluminum eddy current density, and three components of Lorentz force are analyzed. Also, the finite element method and the analytical method is used for the 3 D analysis of the edge effects as well as the end effects. To show the advantages of the proposed structure, the results are compared with other secondary structures. The results show that the thrust and efficiency of the salient single-sided linear induction motor increased in comparison with other ones.

摘要

直线感应电机由于其独特的功能，可用于各种应用。直线感应电机最关键的缺点是次级和初级之间的气隙很大。这个问题使直线感应电机的性能变差，增加了功率损耗，并导致效率低下。在本文中，提出了一种单边直线感应电机的新型结构来减小磁气隙。这种结构由梯形狭缝片和单面直线感应电机次级的凸背铁组成。背铁的凸出部分填满了薄板的缝隙，因此可以通过局部形式减小有效磁气隙。此外，所提出的次级的电磁方面，例如气隙磁通密度的z分量，y分析了铝涡流密度的分量和洛伦兹力的三个分量。此外，有限元法和解析法用于边缘效应和端部效应的 3D 分析。为了显示所提出结构的优点，将结果与其他二级结构进行了比较。结果表明，与其他电机相比，凸出型单边直线感应电机的推力和效率都有所提高。