Analysis of Natural Vibration Characteristics of Permanent Magnet Linear Synchronous Motor Considering Elastic Contact

The permanent magnet linear synchronous motor (PMLSM) significantly differs from rotary motors in constraint methods, motion characteristics, and dynamic vibration modes. This paper presents a dynamic analysis model for PMLSMs that takes into account the elastic stiffness of the guideway-slider contact surface. Hertz's contact theory is utilized to determine the elastic stiffness of the contact surface. The natural frequency considering only the mover is compared with the whole PMLSM machine considering elastic constraints. The results indicate that the analysis model considering elastic constraints can more accurately represent the dynamic characteristics of the PMLSM. Furthermore, the natural frequencies and mode shapes are obtained through experiments. The experimental results indicate that the model proposed in this paper can accurately reflect the modal vibration mode of PMLSM when considering the elastic stiffness of the contact surface.