Indirect field oriented control of linear induction motor based on optimized slip frequency for traction application

The characteristic of linear induction motor (LIM) are quite different from the rotary induction motor (RIM) due to the end effects and so on. The conventional high performance control scheme like indirect field oriented control (IFOC) cannot be directly adopted for LIM drives. In this paper, the traction characteristic of the LIM and RIM are compared from different perspectives. The performance of different control laws of LIM are discussed with consideration of the limitations of traction inverters. The indirect field oriented control scheme based on optimized slip frequency is proposed which can effectively improve the output thrust performance of LIM without primary current increasing. Both simulation and experimental results show the effectiveness of the proposed scheme, which can be adopted for the traction control of LIM drives.