Performance Comparison and Optimization of Permanent Magnet Flux Switching Linear Motor for Ropless Elevator System

Due to the continuous rise of buildings, ropless elevator systems have gradually attracted widespread attention. Permanent magnet flux switching linear motor (PMFSLM), which the advantages of high thrust density, high power density, high power factor and high reliability is suitable for ropeless elevator systems. In this paper, the conventional permanent magnet flux switching linear motor(PMFSLM) for ropless elevator system are analyzed and a novel U-type permanent magnet flux-switching linear motor (UPM-FSLM) is proposed. Through changing the positional arrangement of the permanent magnets, which reduced magnetic leakage and improved the thrust density and power factor of UPM-FSLM. By finite element analysis (FEA), compared the electromagnetic performance of two motors, including magnetic field, back electromagnetic force (back-EMF), thrust force, and thrust force ripple are simulated. The comparison results verified that UPM-FSLM with higher thrust density, lower thrust ripples and higher structural strength. In order to verify the feasibility of applying PMFSLM to the ropeless elevator system. The test results show that PMFSLM is suitable for the ropless elevator system.