Characteristics investigation of single-sided ironless pmlsm based on halbach array for medium-speed Maglev train

Abstract

This paper investigates characteristics of ironless permanent magnet linear synchronous motor (PMLSM) based on Halbach array used for medium-speed (200km/h) maglev train. Long primary ironless coil is laid in the middle of track and the Halbach permanent magnet array is attached to the bottom of each bogie as a source of traction, U-shape electromagnets at the both sides of the train for levitation. Two dimensional analytical model of single-sided ironless PMLSM based on Halbach array is established, using linear overlay method, the no-load air gap magnetic field is calculated firstly, winding current density distribution is obtained for calculating the characteristics of thrust and normal force against power angle, including force characteristics with equal and unequal pole pitch, the influence of steel sleeper, etc. Besides, the mathematical model for this type motor is built by 3D finite element method, the traction characteristics of medium-speed maglev under maximum speed 200km/h are calculated. The characteristics of this type motor are satisfactory owing to there is no detent force in the motor and thrust force reach maximum meanwhile normal force can be eliminated. Calculation method is verified by comparing finite element results, experimental result on a 200kW type motor further validates the accuracy of calculation and some important conclusions are obtained. Index Terms-Fore characteristics, Halbach array, medium-speed Maglev, Single-sided ironless PMLSM. I. INTRODUCTION OWADAYS, maglev train has successful commercial operation in the world [1-12]. It is represented by Shanghai high-speed (430km/h) maglev train and Nagoya low-speed (100km/h) HSST. Shanghai maglev train adopts normal conducting magnetic levitation technology of Germany, which adopts long primary linear synchronous motor (LSM) as traction power, the maglev vehicles are suspended by the attractive force between the electromagnets and primary core (EMS), this type maglev train is more suitable for high speed operation due to long primary LSM and additional guidance electromagnets. Other high-speed maglev train, such as the Japanese MLX utilizes superconducting electro-dynamic

Electromagnetic Design and Analysis of Permanent Magnet Linear Synchronous Motor

“…The electromagnetic thrust is calculated using the Maxwell tensor method in [12,13]. In The literature [14] a 3D finite element modeling of a unilateral non-ferrous core hybrid magnetized PMLSM and the analysis and calculation of the magnetic flux density and thrust characteristics of the no-load air gap are Energies 2022, 15, 5441 2 of 17 calculated. The literature [15] committed to the study of a high-thrust PMLSM, analyzing the effect of motor size on motor thrust and normal force and verifying it through finite elements.…”

Pole Optimization and Thrust Ripple Suppression of New Halbach Consequent-Pole PMLSM for Ropeless Elevator Propulsion

“…In order to improve the problems of the aforementioned CP motors, we propose a new HCP structure for PMLSM. In the Halbach array, radial and tangential PM segments are assembled to concentrate the magnetic field and thus strengthen the air-gap flux density [34]- [37]. The proposed HCP-PMLSM configuration combining the features of high PM utilization in the CP motor and high flux density in Halbach array.…”

Research on power‐angle characteristics of permanent magnet linear synchronous motor

“…The thrust and thrust ripple characteristics in different conditions of a double‐side plate PMLSM for EML were analysed in [10]. The force characteristics of a single‐side ironless PMLSM for a medium‐speed Maglev train were analysed in [11]. The magnetic‐field distribution of a disk‐type PMLSM was analysed in [12].…”