Magnetic Field Analysis and Thrust Fluctuation Optimization of Permanent Magnet Synchronous Linear Motor for Electromagnetic Launch

The magnetic field analysis and thrust fluctuation optimization of a permanent magnet synchronous linear motor for electromagnetic launch are performed by establishing an analytical model of the magnetic field of a single-sided motor for electromagnetic launch. The magnetic fields of the secondary Halbach permanent magnet array and the primary six-phase winding are analyzed to obtain the air-gap magnetic field distribution by using the vector magnetic potential and boundary conditions, and then the functional relationship between the electromagnetic thrust and the main structural parameters of single-sided motor is established. The pole arc coefficient and thickness of permanent magnet array, and width and thickness of primary winding are selected as optimization variables, and the optimal combination of design variables is found by using genetic algorithm to minimize the ripple of the unilateral electromagnetic thrust of single-sided motor. The analysis shows that the accuracy of magnetic field analysis results is high, and the calculation error of electromagnetic thrust meets the needs of engineering analysis. The average thrust of the optimized single-sided motor is increased by 1. 21%, and the peak-to-average force ratio is decreased by 62. 688% . The correctness of theoretical derivation and the rationality of the optimization method are verified by comparing the analyzed and simulated results. © 2024 China Ordnance Industry Corporation. All rights reserved.