Propulsion, levitation, and guidance (PLG) are the main technologies of high-speed maglev system. A linear synchronous motor (LSM) integrated with PLG is presented, which can simultaneously realize the three functions of the maglev system by only one electromagnetic system. A novel bilateral Fourier decomposition method for analyzing the 3-D force characteristics of the LSM is proposed, which has the advantages of wider range of solutions, simpler formulation, shorter computation times, and satisfactory precision. First, the topological structure of the LSM is introduced, and the 3-D magnetic field generated by the secondary superconducting (SC) coil is calculated. Second, the primary current of the combined coil is decoupled into PLG current, and then, the analytical expressions of forces generated by three currents are obtained. Finally, the 3-D force characteristics of the LSM at different running speeds, different suspension heights, and lateral offset of the maglev are calculated, and the correctness of the theory is verified by the publicly measured data on the Yamanashi line. The results obtained by the bilateral Fourier decomposition method provide a certain reference value for the LSM integrated with PLG in the initial stage of electromagnetic design.

Propulsion, levitation, and guidance (PLG) are the key technologies of high-speed maglev system. A linear synchronous motor (LSM) combined with PLG is presented, which can simultaneously realize the three functions of PLG. A novel analytical method for analyzing the 3-D electromagnetic forces of the LSM is proposed. First, the overall structure and operating principle of the high-speed maglev system are discussed. Second, the 3-D analytical model of the LSM is proposed, and the analytical expressions of propulsion force, levitation force, and guidance force are obtained according to the change in the system magnetic field energy during the operation of the maglev train. Finally, the 3-D force characteristics of LSM under different operating conditions of maglev train are calculated and simulated, and the correctness of the 3-D analytical model is verified by the publicly measured data on the Yamanashi line.

The characteristics of coreless-type linear synchronous motor, which is applied in the propulsion system of electrodynamic suspension maglev train are calculated and analyzed by the more accurate analytical model. First, the magnetomotive force distribution model of the vehicle coils is proposed according to their racetrack shape. Then, on the basis of the space harmonic method, the characteristic analysis formula of coreless-type linear synchronous motor with single-layer and double-layer armature winding are presented. Second, the air-gap flux density, back electrodynamic force, and thrust of the coreless-type linear synchronous motor are analyzed by the three-dimensional finite element simulation method and the analytical methods. Then, the relationship of efficiency, power factor, and power angle with the number of feeder units is obtained. Finally, the accuracy of the analytical model and numerical result are experimentally validated by comparing with the transient operation data on Yamanashi and Miyazaki test line.

Due to the existence of the end effect of the vehicle coils in the electrodynamic suspension maglev, the fluctuation of the output parameters of the suspension and guidance system is common, which has an impact on the stability of the motor driving system. In this paper, considering the end effect of vehicle coils, a new magnetomotive force distribution model suitable for the suspension and guidance system of electrodynamic suspension maglev is proposed. Firstly, considering the end effect of vehicle coils, a magnetomotive force model of array of vehicle coils is established. Then, based on space harmonic method and the equivalent circuit of suspension and guidance loop, the expressions of levitation current, guidance current, drag force, levitation force, levitation stiffness, guidance force and guidance stiffness are presented. Finally, the characteristics of the suspension and guidance system are analyzed under different running conditions. The numerical results are compared with the three-dimensional finite element method simulation results and the experimental results of the Yamanashi test line. The relative error is almost within 10%, which verified the feasibility and accuracy of the magnetomotive force model and analytical method.

Propulsion, levitation and guidance characteristics are the key technology of electro-dynamic suspension Maglev train. An air-core integrated linear synchronous motor with asymmetric primary combined coils is introduced, which can not only simultaneously realize the propulsion, levitation and guidance performances, but also analyze the electromagnetic performance variation of linear synchronous motor under pitching condition. The novel three-dimensional analytical method is proposed for analyzing the transient electromechanical characteristics of the linear synchronous motor. Firstly, the topology structure and operation principle of the linear synchronous motor with pitching attitude are proposed. Secondly, the three-dimensional analytical methods and expressions of electromechanical characteristics are obtained by equivalent circuit method and Fourier decomposition method, such as levitation force, guidance force, propulsion force and pitching torque, etc. Finally, the three-dimensional electromechanical characteristics of the linear synchronous motor are calculated under pitching operation conditions in high-speed maglev train, and the correctness of the analytical theory is verified by the finite element analysis and measured data of on-board motor.

Propulsion, levitation and guidance (PLG) are the major technologies for maglev train. An improved structure of transverse flux linear synchronous motor (TFLSM) is presented in this paper, which can simultaneously realize the PLG functions of the maglev train by only one electromagnetic device. Firstly, the topological structure and the operating principle of the TFLSM are analyzed. Secondly, the three-dimensional (3-D) analytical model of TFLSM is proposed, in which the analytical expressions of inductance and electromagnetic forces are obtained. Finally, the 3-D force characteristics of the TFLSM at different supply current values, different air gap length and transverse offsets are calculated. The theoretical analysis results are compared with the experimental results of the test prototype, which verify the effectiveness and correctness of the analytical method.