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Analysis on Axial End Flux Leakage and Resonance Characteristic of TFPM Linear Generator for Thermoacoustic Electric Generation System

According to 3-D magnetic circuit of the transverse flux permanent magnet linear generator (TFPMLG), the area of end flux leakage is divided into several zones, and the analytical expression of axial end flux leakage is derived through conformal transformation. The linear machine equivalent stiffness factor is derived through the calculation of detent force. Combining the linear machine with mechanical resonance property of thermoacoustic electric generation system, the computing method on resonance spring parameters of the system is provided. A 3-D finite-element model of TFPMLG is built to analyze the flux leakage distribution. The experimental results of the linear machine verified the validity of detent force and stiffness factor theoretical derivation; the research on axial end flux leakage and resonance spring parameters provides a valuable reference to other types of linear machines.