Advanced Methodologies on Design and Control for Linear Induction Machine and Drive Adopted to Urban Transportation

Urban transportation, e.g., linear metro, driven by linear induction machine (LIM) has been paid more attention by both academia and industry recently for its direct thrust drive, strong climbing ability, flexible line choice, smaller cross section area, lower noise, etc. However, this system is greatly different with traditional rotary induction machine (IM) due to its cut-open primary (end effect), normal force resulted from the asymmetric structure, eddy current in the secondary, and so on. There exists great difficulty for accurate modelling and advanced control strategies for LIM influenced by nonlinear circuit, partial magnetic saturation, internal and external disturbance, etc. This paper will introduce one new reasonable equivalent circuit for LIM performance analysis, as well as some specific design and control case studies. Afterwards, advanced control strategies, like efficiency optimization control (EOC), model predictive control (MPC), will be employed to further increase the LIM drive indexes, such as average thrust, efficiency, etc.