Study on Design and Chara Cteristics of Slotless Permanent Magnet Linear Synchronous Motor
|School||Henan Polytechnic University|
|Course||Motor and electrical|
|Keywords||slotless PMLSM electromagnetic design characteristic analysis structural analysis|
Slotless permanent magnet linear synchronous motor (PMLSM) is a kind of novel motor with high control precision and simple technology. From domestic and foreign papers, the majority of research is about static characteristics, while fewer documents are about design and dynamic characteristics that still need to be further research. Therefore, this paper does work on design and characteristics of slotless PMLSM.Based on reasonable assumptions, physical model of slotless PMLSM is built. Due to larger air-gap and flux leakage in slotless PMLSM, volume current density, which distributes along actual height of PM, is adopted to be equivalent to magnetism of PM. Armature current density is considered according to its practical distribution. Six-layer linear analysis model of slotless PMLSM, which is used to analytical magnetic field, is proposed. Then, electromagnetic design and verification programs are proformed.According to analysis of magnetic field of slotless PMLSM, static and dynamic characteristics are analyzed by the analytical method, which mainly include magnetic flux density, flux linkage, static force-displacement characteristics, electromagnetic thrust force, detent force, self-inductance, mutual inductance, velocity, acceleration, and so on. Then, analytical result is confirmed to agree with that of the finite element method (FEM). At the same time, it is satisfied with design requirements. Furthermore, the discussion on results is executed. Combining analysis of magnetic field, effects of structural parameters on electromagnetic parameters and performance parameters are discussed. Through analytical method and the finite element method, the predicted results are obtained as well as the valueable conclusion, which indicates the validity of analytical method and rationality of structural design.Researching concretely slotless PMLSM with respect to design, static and dynamic characteristics and structural parameters can be helpful to perfect the theory of motor, and also lay the foundation for further development of slotless PMLSM.