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Magnetic field and thrust analysis of the U-channel air-core permanent magnet linear synchronous motor

In order to analyze the magnetic field and the thrust performance of the U-channel air-core permanent magnet linear synchronous motor (UAPMLSM), an analytical model is proposed by using the equivalent magnetization intensity (EMI) method. The analytical formulas of the magnetic flux density and thrust considering space harmonic components are derived. The formulas are proved accurate by the results obtained from the finite element method (FEM). The influence of the pole-arc ratio αp and coil span coefficient Cp on the magnetic field and thrust are illustrated on the basis of the derived formulas. The derived formulas could be used for the optimal design of the UAPMLSM.