A Model for Analyzing a Five Phase Fractional Slot Permanent Magnet Tubular Linear Motor with Modified Winding Function Approach
This paper presents a model for analyzing a five phase fractional slot permanent magnet tubular linear motor FSPMTLM with the modified winding function approach MWFA. MWFA is a fast modeling method and it gives deep insight into the calculations of the following parameters: air gap magnetic field, inductances, flux linkages, and detent force, which are essential in modeling the motor. First, using a magnetic circuit model, the air gap magnetic density is computed from stator magnetomotive force MMF, flux barrier, and mover geometry. Second, the inductances, flux linkages, and detent force are analytically calculated using modified winding function and the air gap magnetic density. Finally, a model has been established with the five phase Park transformation and simulated. The calculations of detent force reveal that the end effect force is the main component of the detent force. This is also proven by finite element analysis on the motor. The accuracy of the model is validated by comparing with the results obtained using semianalytical method SAM and measurements to analyze the motor's transient characteristics. In addition, the proposed method requires less computation time.
J. Electr. Comput. Eng.