Study on the Levitation and Traction Characteristics of High-speed Maglev Trains Dragged by Five-phase Synchronous Linear Motors
In response to the demand for high-speed performance of normal conducting magnetic levitation trains,a five-phase linear synchronous motor is proposed as the traction and levitation system.On the basis of the long stator cogging structure of the traditional three-phase LSM,the widths of the main and final poles of the levitation electromagnet are increased to meet the principle of the long pitch of the kinetic poles;then the parameters of reactance,resistance and excitation electromotive force of the five-phase LSM are calculated according to the analytical method,and the equivalent circuit is established;finally,a two-dimensional model of the five-phase and three-phase LSMs is established in the finite element,and the traction and levitation characteristics of the five-phase LSM are calculated and analyzed.The results show that the five-phase LSM can provide more armature current under the same voltage as the three-phase LSM,which is beneficial to the thrust force;and the traction and suspension force of the five-phase LSM with the same excitation current are larger than those of the three-phase LSM under the same levitation air gap;the traction and levitation force of the five-phase LSM with the same levitation air gap are also larger than those of the three-phase LSM under the same excitation current.The above results show that the five-phase LSM has better traction and levitation characteristics than the three-phase LSM,and also has a higher speed boost range.
Normal conducting magnetic levitation trainsfive-phase long-stator synchronous linear motorlong stator cogging structurefinite elementtraction and levitation characteristics
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