Analytic calculation of magnetic field and force in Halbach permanent magnet linear motor

Zhang, Qi; Pan, Mengchun; Chen, Dixiang

doi:10.1109/icemi.2011.6037951

Cited by 7 publications

(5 citation statements)

References 6 publications

(5 reference statements)

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“…According to electromagnetic theory, magnetic field of a permanent magnet can be expressed by assuming surface current on the magnet surface. 15 Let I i (i = 1 -4) [A/m] denote surface currents per unit length on four sides; assume that the currents stack in y direction as infinite wires stretched in z direction. Magnetic flux density dB 1 produced by stacked surface current I 1 is expressed as follows.…”

Section: Magnetic Field Of Permanent Magnetmentioning

confidence: 99%

“…The analysis model deals with a standalone permanent magnet. According to electromagnetic theory, magnetic field of a permanent magnet can be expressed by assuming surface current on the magnet surface 15 . Let I i ( i = 1 – 4) [A/m] denote surface currents per unit length on four sides; assume that the currents stack in y direction as infinite wires stretched in z direction.…”

Section: Numerical Analysis Of End Effectmentioning

confidence: 99%

“…In addition, a number of techniques were proposed to control thrust ripple in moving-magnet motors. [8][9][10][11][12][13][14][15] In a contactless planar linear motor design presented in Literature 8, a mover with a field system composed of Halbach array that generates a strong magnetic field is combined with a mover's armature composed of air-core coils. Thus, thrust acting on the mover is produced simultaneously with levitation force that supports the whole mover's weight, while vertical displacement and thrust ripple are reduced by optimizing coil shape and size as well as magnet size.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, a number of techniques were proposed to control thrust ripple in moving‐magnet motors 8–15 . In a contactless planar linear motor design presented in Literature 8, a mover with a field system composed of Halbach array that generates a strong magnetic field is combined with a mover's armature composed of air‐core coils.…”

Section: Introductionmentioning

confidence: 99%

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End effects of Halbach field magnet‐type linear motor

Yamaguchi,

Morishita

2023

Electrical Engineering Japan

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A linear motor that uses a finite length Halbach array as its magnetic field causes a thrust force ripple owing to end effects. In this paper, the theoretical and numerical analysis methods of the Halbach array are investigated. The results of the electromagnetic field analysis are compared to confirm the validity of the theoretical and numerical solutions. Moreover, we focus on the magnetic pole period and coil arrangement of the finite length Halbach field type linear motor to eliminate the influence of the end effects, and report the relationship with the end effects.

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Section: Magnetic Field Of Permanent Magnetmentioning

confidence: 99%

Section: Numerical Analysis Of End Effectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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End effects of Halbach field magnet‐type linear motor

Yamaguchi,

Morishita

2023

Electrical Engineering Japan

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“…Several research works have been done on the design and analysis of Halbach PMSM [23][24][25][26][27][28][29][30][31][32][33]. The theoretical analysis method and 2D/3D finite element method (FEM) of the Halbach PMLSM are introduced in [23][24][25][26][27][28].…”

mentioning

confidence: 99%

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

Zhang

Shi

Wang

et al. 2017

Trans. Electr. Mach. Syst.

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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

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