接线相位差对直线电机牵引性能的影响

Influence of connection phase difference on the traction performance of linear induction motor

相邻短初级直线感应电机串联运行时,初级电流相位差对电机牵引性能的影响较大,值得深入研究.本文基于单台电机纵向边端效应分析理论,建立相邻串联电机的纵向边端效应计算模型,对电流相位差与电机复量功率和推力之间的数学关系进行推导;然后利用数学模型对电机电磁特性随接线相位差的变化情况进行详细的分析;最后提出不同间距下电机最佳接线相位差的计算方式.结果表明:电流接线相位差的不同将改变相邻串联电机的纵向边端效应影响系数,随着速度的增大影响越来越明显,且对第二台电机的影响大于第一台电机(按行进的方向),不同的接线相位差使电机牵引力最大有约1kN的差值.利用本文提出的计算方法可为相邻电机选择合理的接线方式,研究结果可为实际工程提供技术指导,通过简便的操作使车辆的牵引性能得到有效的提高.

When two adjacent linear induction motor (LIM) with short primary run in series connection, the primary current phase difference has a great influence on the traction performance of the LIM and is worthy of in-depth study. Based on the theory of longitudinal end effect analysis for a single LIM, the calculation model of the longitudinal end effect for two adjacent series LIMs was established. The mathematical relationship between the connection phase difference and the LIM’s complex power and traction was derived. Then the electromagnetic characteristics of the LIMs with the change of the connection phase difference were analyzed. Finally, the calculation formulas of the optimal connection phase difference for different LIM spacing were proposed. The results show that different connection phase difference will change the influence coefficient of the longitudinal end effect of the adjacent series LIMs, which becomes more and more obvious with the increase of the speed, and the influence on the second LIM is greater than that of the first LIM. The maximum difference of the motor traction caused by the connection phase difference is about 1 kN. Using the calculation method proposed in this paper, a reasonable connection mode can be selected for the adjacent LIMs. The results can provide technical guidance for the actual project, and the traction performance of the vehicle can be effectively improved by simple operation.