双初级耦合直线感应电动机研究

Double-primary Coupling Linear Induction Motors

为提高可靠性和冗余性,可以将直线感应电动机的初级按照上下方向布置m台并联运行,且m台初级共用1个次级。这样即使一台初级发生故障,仍可以通过另外m?1台初级过载完成预先设定的任务。对双初级耦合直线感应电动机(m=2)的模型及性能进行了研究,分析了双初级的耦合关系及其对电机等效电路和参数的影响,在此基础上对不同工况下的端口电压、电磁推力等性能进行分析计算。计算和实测结果表明,双初级直线电机同时通入同相电流时,推力大于2台初级单独工作时的推力之和,而端口电压低于单独初级工作时的电压,效率和推力密度与单初级电机相比有所提高。

A linear induction moter（LIM） with m primaries（m is an integer and m≥2） and just one secondary was designed for improving its redundancy and reliability.On this basis,even if any single primary malfunctions,the others will accomplish the scheduled target.This paper introduced a technique for modeling double-primary（m=2） coupling LIM based on the analysis of the relationship between coupling primaries.Calculation results in performances of terminal voltage and electromagnetic thrust were presented and compared with the test data,which indicated that the double-primary coupling LIM has a larger thrust than that summed up from two primaries LIM when independently operated;while it has a lower terminal voltage with both efficiency and thrust density improved.