Computer-aided Design Of Linear Motors And Its Research

Linear induction motor (LIM) is a kind of driving equipment that can directly convert electrical energy to linear movement. It is unnecessary for LIM to have an intermediary agency to output linear motion, which is different from the rotary ones. Hence, it makes mechanical gears and transmission systems simple, which result in higher efficiency, higher dynamic performance, and improved reliability. Therefore, it is used in a variety of fields such as industrial production, transportation and so on.This thesis mainly studies the design of LIM and its simulation by finite element method (FEM). Firstly, the characteristic of the LIM is discussed and then the design equations of the LIM and the equivalent circuit model are studied and discussed in detail. A LIM of specified parameters is designed using a user-interactive MATLAB program. The LIM design algorithm is made completely user-interactive where the user has the convenience of choosing various design parameters like the primary voltage and frequency, number of phases, number of poles, velocity, thrust force, etc. The structural parameters of the motor will be calculated by the user-interactive MATLAB program according to users' requirements. Secondly, this thesis simulates the designed LIM by ANSOFT Maxwell 2D and gets the dynamic behavior of LIM. The steps of the simulation are amplified, and the dynamic characteristic curve of LIM such as the flux distributions, velocity, position and thrust force are also analyzed. The simulation proves the correction of the designed LIM before. Thirdly, this thesis also investigates the primary structure of the high-temperature superconducting (HTS) LIM. The primary wind must be designed as a double-pancake shape according to the characteristic of the HTS tape. The operating characteristic of the LIM with three layer and four layer winding configuration are simulated by Maxwell 2D. The simulation indicates that the four layer winding configuration is suitable for the HTS LIM. This has well prepared for the design of the HTS LIM.