Double-primary Coupling Linear Induction Motors

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.