Analysis for Ring Arranged Axial Field Halbach Permanent Magnets

Wang, Housheng; Yang, Ying; Wang, Qiuliang; Dai, Yinming; Yu, Yunjia; Peide, Weng

doi:10.1109/tasc.2005.869628

Cited by 17 publications

(9 citation statements)

References 9 publications

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“…Before that, according to the classical electromagnetism, for the vacuum, there are the following equations satisfied (see Ref. [9][10][11][12][13]). …”

Section: Magnetic Field Analysismentioning

confidence: 99%

Study of the load reduction for hydro-generator bearing by hybrid magnetic levitation

Wang

2013

International Journal of Applied Electromagnetics and Mechanics

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To solve the problem of heat and friction existing in weight bearing of the hydraulic generator, a new type of magnetic levitation devices is proposed. The devices consist of electromagnetic and permanent magnetic levitation, which share together most of the hydraulic generator rotor weight to reduce axial load on thrust bearing. The permanent magnetic levitation is performed by new repulsive ring Halbach arrays. The new Halbach arrays are analyzed by using magnetic potential equations and superposition principle, and the magnetic flux density formulas are obtained. The formula results are verified by FEM. By further study of 3D model simulation analysis, it is confirmed that the new repulsive ring Halbach arrays can reach the design goal on actual working conditions.

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“…Before that, according to the classical electromagnetism, for the vacuum, there are the following equations satisfied (see Ref. [9][10][11][12][13]). …”

Section: Magnetic Field Analysismentioning

confidence: 99%

Study of the load reduction for hydro-generator bearing by hybrid magnetic levitation

Wang

2013

International Journal of Applied Electromagnetics and Mechanics

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“…In polar coordinates, when the general solutions of (8) are obtained as (9) For the particular case when (10) The boundary conditions can be expressed as (11) According to , when the general harmonic functions for the flux density in regions I and III can be deduced as (12) where the coefficients and in (12), (13), (14), and (15) are given in Appendix A. In order to ease the numerical computation, the expressions of and are rewritten in Appendix B.…”

Section: B General Solutions In Polar Coordinatesmentioning

confidence: 99%

“…Meanwhile, the expressions for the air-gap flux density were rewritten in [9] according to different motor topologies, which makes the improved model more practical. A formula for the ring arranged axial field Halbach permanent magnet was presented in [10], which is designed for an electrodynamic suspension experimental system. In all the above references, the magnetic scalar potential was used for computing the magnetic field, while the expression for the flux density in [11] was derived with the magnetic vector potential, and the force between Manuscript two concentric Halbach cylinders was also calculated.…”

Section: Introductionmentioning

confidence: 99%

Modeling, Analyzing, and Parameter Design of the Magnetic Field of a Segmented Halbach Cylinder

et al. 2012

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The Halbach magnet array has become more and more attractive in many electromagnetic engineering domains such as electrical motors for its potential features such as self-shielding and providing sinusoidal field distribution. This paper develops analytical models formulated in polar coordinates for predicting the field distribution of a segmented Halbach magnet cylinder with or without back iron. Based on the analytical models, the relationships between the air-gap flux density and four design parameters including pole-pair number, segment number per pole, permanent-magnet radial dimension, and air-gap length are analyzed. Further, the Taguchi method is employed to identify the settings of design parameters and determine the parameters which have a significant effect on the field distribution. The analytical models are verified by taking advantage of the finite-element method (FEM), which shows that all the results can be of considerable use in the design of permanent-magnet machines.Index Terms-Halbach array, Halbach cylinder, magnetic field, permanent magnet, Taguchi method.

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“…Halbach Array magnetization was proposed in many applications [2] and has become increasingly popular [1] with various topologies and applications: radial [3] and axial-field [4], slotted and slotless [5][6][7][8], tubular and planar for rotary [9,10] or linear [11] machines. Halbach Array configurations exhibit several attractive features including a sinusoidal field distribution in air gap that results in a minimal cogging torque and a more sinusoidal back EMF waveform [12].…”

Section: Introductionmentioning

confidence: 99%

An Analytical Subdomain Model of Torque Dense Halbach Array Motors

et al. 2018

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A two-dimensional mathematical model estimating the torque of a Halbach Array surface permanent magnet (SPM) motor with a non-overlapping winding layout is developed. The magnetic field domain for the two-dimensional (2-D) motor model is divided into five regions: slots, slot openings, air gap, rotor magnets and rotor back iron. Applying the separation of variable method, an expression of magnetic vector potential distribution can be represented as Fourier series. By considering the interface and boundary conditions connecting the proposed regions, the Fourier series constants are determined. The proposed model offers a computationally efficient approach to analyze SPM motor designs including those having a Halbach Array. Since the tooth-tip and slots parameters are included in the model, the electromagnetic performance of an SPM motor, described using the cogging torque, back-EMF and electromagnetic torque, can be calculated as function of the slots and tooth-tips effects. The proposed analytical predictions are compared with results obtained from finite-element analysis. Finally, a performance comparison between a conventional and Halbach Array SPM motor is performed.

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Analysis for Ring Arranged Axial Field Halbach Permanent Magnets

Cited by 17 publications

References 9 publications

Study of the load reduction for hydro-generator bearing by hybrid magnetic levitation

Study of the load reduction for hydro-generator bearing by hybrid magnetic levitation

Modeling, Analyzing, and Parameter Design of the Magnetic Field of a Segmented Halbach Cylinder

An Analytical Subdomain Model of Torque Dense Halbach Array Motors

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