次级断续时直线感应牵引电机的等效电路

doi:10.19595/j.cnki.1000-6753.tces.200804

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摘要直线感应电机作为轨道交通车辆的牵引电机,在道岔、转弯等路段会出现次级感应板缺失的情况,次级连续时的等效电路不再适用。针对此特殊工况,提出一种基于气隙磁通密度的分布模型,考虑次级断续的等效电路。首先,建立直线感应电机次级断续时的分析模型,根据初、次级耦合情况把断续工况分成三个阶段。然后,利用线性近似化法修正随耦合区域长度变化的初级漏感、励磁电感等参数。结合气隙磁通密度分布模型与次级断续工况,考虑纵向端部效应的影响,修正励磁支路上的励磁电感和表征端部效应涡流损耗的等效电阻,推导出三个阶段的等效电路来表示初级通过次级感应板断续区域这一动态过程。最后,根据等效电路求出电机推力和效率的动态变化曲线,并与实验台的测量结果对比,验证了所提等效电路的正确性。

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关键词 ：直线感应电机, 次级断续, 等效电路, 纵向端部效应, 气隙磁通密度

Abstract：When linear induction motor is used as traction motor of rail transit vehicles, the secondary induction plate will be missing in turnouts, turns and other sections, and the equivalent circuit with continuous secondary is no longer applicable. For this special working condition, a equivalent circuit based on the new air gap flux density distribution model and considering secondary discontinuity is proposed. Firstly, the analysis model of linear induction motor with discontinuous secondary is established. According to the coupling conditions of the primary and secondary, the discontinuous working condition is divided into three stages. Then, the linear approximation method is used to correct the primary leakage inductance, excitation inductance and other parameters which vary with the length of the coupling region. Combined with the new air gap flux density distribution model and the discontinuous condition of the secondary, considering the influence of longitudinal end effect, the excitation inductance on the excitation branch and the equivalent resistance representing the eddy current loss of end effect are modified. The equivalent circuit of three stages is derived to represent the dynamic process of the primary passing through the discontinuous region of the secondary induction plate. Finally, the dynamic curve of the thrust and efficiency of the motor are obtained according to the equivalent circuit, and the correctness of the proposed equivalent circuit is verified by comparing with the experimental results.

Key words： Linear induction motor discontinuous secondary equivalent circuit longitudinal end effect air gap flux density

收稿日期: 2020-07-07

PACS:

TM359.4

基金资助:国家自然科学基金资助项目（51777009,52077003）

通讯作者: 吕刚男,1976年生,博士,教授,研究方向为轨道交通直线电机与磁悬浮技术。E-mail: ganglv@bjtu.edu.cn

作者简介: 罗志昆男,1996年生,硕士研究生,研究方向为直线电机及其控制。E-mail: 18121474@bjtu.edu.cn

引用本文:

吕刚, 罗志昆. 次级断续时直线感应牵引电机的等效电路[J]. 电工技术学报, 2021, 36(6): 1103-1112. Lü Gang, Luo Zhikun. An Equivalent Circuit of Linear Induction Traction Motor with Discontinuous Secondary. Transactions of China Electrotechnical Society, 2021, 36(6): 1103-1112.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.200804 https://dgjsxb.ces-transaction.com/CN/Y2021/V36/I6/1103

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