Development Research of End-Effect Compensator of Linear Induction Motor for Transportation

研究的目的是降低线性感应电动机（LIM）的功耗，为新的电力列车驱动。对于本质解，研究了特征端效应的补偿方法，得到了以下结果：以下两种方法是基于我们提出的概念。对于旋转永磁体型补偿器，实验验证了以下几点。(1)该补偿器可提供二次涡流补偿末端效应。(2)在补偿器的设计中，不仅要考虑电源涡流，还要考虑补偿器的磁通路径——反应板——lim2。对于两线圈补偿器的静态绕组型，解析得到如下结果：(1)通过对补偿器杆距和长度的优化设计，可将LIM额定推力12kN的阻力减小到0.5kN以下。(2)开展了LIM和补偿器的整体特性分析。分析表明，在光补偿条件下，总效率高于无末端效应的光补偿效率。作为具体数值，效率达到80%左右，提高约5%。这是一个有待进一步讨论的新现象。

The aim of research is the reduction of power consumption of linear induction motor (LIM) for the new electric train drive. For the essential solution, the compensation methods of the characteristic end effect were studied and the following results were obtained.The following two methods are based on our proposed concept.1. As regards the rotating permanent magnets type of compensator, the following was verified experimentally.(1) This compensator can supply the secondary eddy current for compensation of end effect.(2) In the design of this compensator, it is necessary to take into consideration not only the supply eddy current but also the flux path of the compensator - the reaction plate - LIM.2. As regards the static winding type of compensator with two coils, the following was obtained analytically.(1) The drag force can be reduced to less than 0.5kN as against the LIM rated thrust of 12kN by the optimum design of the pole pitch and length of compensator.(2) We developed the analysis for the overall characteristics of LIM and the compensator. The analysis shows that the overall efficiency is higher than the efficiency of LIM alone without end effect under the condition of light compensation. As a concrete value, the efficiency becomes to be about 80% that increases by about 5%. This is a new phenomenon for farther discussion.