Research on Thrust Fluctuation and Thermal Field of Tubular Permanent Magnet Linear Machine

A tubular permanent magnet linear machine (TPMLM) is designed for a free-piston Stirling power generating system. As the system requires high stability and dynamic performance of the machine, a design method of stator teeth is introduced to reduce the thrust fluctuation and improve the machine performances by changing the radial length and axial width of side teeth. Besides, the temperature field model of the proposed machine based on finite element method (FEM) is established, and the validity of the design is verified.