Design and Analysis of a Novel Frequency Modulation Secondary for High-Speed Permanent Magnet Linear Synchronous Motor

High-speed permanent magnet linear synchronous motor (PMLSM) is desired by high-performance electromagnetic propulsion system. A novel frequency modulation (FM) secondary proposed here to overcome the issues resulting from a big pole pitch of high-speed PMLSM, as well as avoid a damage to the thrust characteristics. First, the topology structure of FM secondary is designed, modeling of the main magnetic field excited by permanent magnets (PMs) is accomplished. And the impacts of FM secondary on the main magnetic field and PM eddy-current loss are presented based on the analytical method and finite-element method (FEM). The electromagnetic thrust of PMLSM with FM secondary is calculated, and the influences of FM secondary on thrust characteristics are studied by FEM simulations. Finally, a prototype of PMLSM with FM secondary is manufactured, the experiments are provided to validate the analytical results and simulation results of FM secondary.