Research on LSM with Permanent Magnet Halbach and Ironless Coil for Magnetic Levitation Vehicles

In this paper, a kind of Linear Synchronous Motor (LSM) with Permanent Magnet (PM) arranged in Halbach array and IronLess Coil (PMH&ILC) is presented for Magnetic Levitation Vehicles (Maglev). First, the propulsion force of this kind of LSM is deduced analytically. Then, the influences of pole spacing, the current in the coil, the width of the motor and the size of the Halbach array on the propulsion force are analyzed mathematically in detail. Based on the results, the design method and basic principle of PMH&ILC-typed LSM are proposed, which shows a better performance with small pole spacing, higher permanent magnet array, optimal value of the width of the permanent magnet Halbach and so on. Finally, a sample LSM system is designed according to the requirements of Maglev propulsion system.