Modeling and parameter measurement scheme for double primaries coupling Linear Induction Motors

In order to improve the redundancy performance, Linear Induction Motor (LIM) could be designed to have m primaries (m is an integer and m≥2) and just one secondary. When anyone of the primaries runs in failure model, other remanent primaries could accomplish the scheduled target. The paper represents equivalent circuit of double primaries coupling (m=2) LIM based on the research of mathematic model. Test data of no load and locked mover for single primary excited and double primaries excited with the same current are used for parameter measurement. Calculation results of the machine performance (e.g., terminal voltage and force) based on the motor model are presented and compared to test data from a prototype LIM. Result of compare shows that motor model and parameter measurement scheme for double primaries coupling LIM is efficient and accurate. Result of calculation and test indicates that when excited with the same current, efficiency and thrust density of double primaries coupling LIM are improved.