A compensation method for the end effect of a linear induction motor
A compensation method for the end effect of a linear induction motor
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DOI：
10.1002/eej.10132
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发表时间：
2002-04
影响因子：
0.4
通讯作者：
N. Fujii;T. Harada;Y. Sakamoto;T. Kayasuga
中科院分区：
文献类型：
--
作者：
N. Fujii;T. Harada;Y. Sakamoto;T. Kayasuga
针对直线感应电动机的端部效应，提出了一种新的补偿方法，即在直线感应电动机入口端前，不考虑直线感应电动机初级区域的磁通密度分布，只通过提供与直线感应电动机电流同步的次级电流来补偿端部效应。作为在直线电机前提供二次电流的具体方法，作者提出了采用稀土型永磁体的转子，该转子具有强磁通密度，无欧姆损耗，即使受到端部效应的影响也不会引起功率因数问题。对地铁直线电机设计的数值算例进行了分析研究，结果如下。该方法可使直线感应电机初级区的磁通密度和推力密度分布与无端部效应情况下的分布基本一致。该方法可以补偿直线电机在额定转速下的推力、功率因数和效率，使其符合无端部效应的特性。有补偿器的直线电机的转差率特性曲线没有问题，尽管补偿器只与直线电机的频率同步旋转。补偿效果在低滑差处变大。在适当的设计中，旋转补偿器的力非常小。© 2003 Wiley Periodicals，Inc. Electr Eng Jpn，143（3）：58-67，2003;在线发表于Wiley InterScience（www.interscience.wiley.com）。DOI 10.1002/eej.10132
For the end effect of a linear induction motor (LIM), the authors propose a new concept that the end effect can be compensated for only by the supply of secondary current synchronized with the current of the LIM in front of the entry end of the LIM, without considering the flux density distribution in the LIM primary region. As a concrete method to supply the secondary current in front of the LIM, the authors propose the rotator with rare‐earth‐type permanent magnets which has a strong flux density without ohmic loss, and does not cause the power factor problem even for the influence of end effect. The results of analytical study on the numerical example of LIM designed for subways are as follows. This method can make the flux density and thrust density distribution in the LIM primary region almost entirely agree with those of the case without end effects. This method can compensate for the thrust, power factor, and efficiency of the LIM at the rated speed to coincide with the characteristics without end effect. There is no problem in the slip characteristic curves of the LIM with the compensator, although the compensator only rotates synchronizing with the frequency of the LIM. The effect of compensation becomes large in the lower slip. The force to rotate the compensator is very small in the suitable design. © 2003 Wiley Periodicals, Inc. Electr Eng Jpn, 143(3): 58–67, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.10132