Analysis and Testing of a Coaxial Magnetic Gearbox With Flux Concentration Halbach Rotors

Som, Debarupa; Li, Kang; Kadel, J.; Wright, Jason D.; Modaresahmadi, Sina; Bird, Jonathan Z.; William, W.

doi:10.1109/tmag.2017.2715799

Cited by 32 publications

(5 citation statements)

References 10 publications

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“…In Halbach magnet magnetization, the magnetic field similar to sinusoidal distribution is the most ideal [15][16][17], but it is difficult to achieve in engineering manufacturing. In order to obtain the sinusoidal magnetic field, the permanent magnet is usually segmented, and then each segment of the permanent magnet is changed to the appropriate magnetization direction.…”

Section: Traditional Halbach Arraymentioning

confidence: 99%

Characteristic Research on Double Rotor Permanent Magnet Motor With Irregular Halbach Array

Pan¹,

Jing²

2021

PIER M

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Dual-rotor permanent magnet motor has the characteristics of high torque density and high efficiency and has a wide range of application prospects in many fields. However, the double air-gap structure also makes the internal magnetic field distribution more complicated and torque fluctuation more serious. To improve the double-layer air-gap magnetic field distribution and reduced torque pulsation, based on the Halbach array magnetization, the inner and outer irregular Halbach array dualrotor permanent magnet motor model was established to obtain the ideal one-sided magnetic field. By comparing the magnetic field distribution of the inner and outer layers, the no-load back-EMF, and the cogging torque, it is proved that the motor with the proposed structure can optimize the air-gap magnetic density and no-load back-EMF and reduce the cogging torque; at the same time, the torque ripple is also significantly reduced to ensure the stability of the motor operation.

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Section: Traditional Halbach Arraymentioning

confidence: 99%

Characteristic Research on Double Rotor Permanent Magnet Motor With Irregular Halbach Array

Pan¹,

Jing²

2021

PIER M

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“…The Halbach array divides the space into two sides, i.e. magnetic gathering and weak magnetic gathering (Som et al , 2017; Xie et al , 2017). The former’s magnetic field distribution tends to be sinusoidal, increasing the magnitude of the magnetic flux density and increasing the electromagnetic torque (Wei and Nakamura, 2021; Song et al , 2020; Xie et al , 2019).…”

Section: Introductionmentioning

confidence: 99%

Magnetic field and electromagnetic performance analysis of permanent magnet machines with segmented Halbach array

Zhang

Wang

Tuo

et al. 2021

COMPEL

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Purpose This study aims to accurately calculate the magnetic field distribution, which is a prerequisite for pre-design and optimization of electromagnetic performance. Accurate calculation of magnetic field distribution is a prerequisite for pre-design and optimization. Design/methodology/approach This paper proposes an analytical model of permanent magnet machines with segmented Halbach array (SHA-PMMs) to predict the magnetic field distribution and electromagnetic performance. The field problem is divided into four subdomains, i.e. permanent magnet, air-gap, stator slot and slot opening. The Poisson’s equation or Laplace’s equation of magnetic vector potential for each subdomain is solved. The field’s solution is obtained by applying the boundary conditions. The electromagnetic performances, such as magnetic flux density, unbalanced magnetic force, cogging torque and electromagnetic torque, are analytically predicted. Then, the influence of design parameters on the torque is explored by using the analytical model. Findings The finite element analysis and prototype experiments verify the analytical model’s accuracy. Adjusting the design parameters, e.g. segments per pole and air-gap length, can effectively increase the electromagnetic torque and simultaneously reduce the torque ripple. Originality/value The main contribution of this paper is to develop an accurate magnetic field analytical model of the SHA-PMMs. It can precisely describe complex topology, e.g. arbitrary segmented Halbach array and semi-closed slots, etc., and can quickly predict the magnetic field distribution and electromagnetic performance simultaneously.

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“…The conventional FMPMG topology is being considered for use in applications such as electric vehicles [3] and wind generators [4]. Following sustained research in the past few decades, various FMPMG topologies, such as axial and flux focusing configurations [5], Halbach magnet arrays [6], dual‐flux‐modulator configurations [7], and FMPMG using a stationary permanent magnet (PM) ring [8], were derived. In addition, a total of 15 FMPMG topologies with simple coaxial radial flux structures were investigated in [9].…”

Section: Introductionmentioning

confidence: 99%

Analysis and experimental verification of a novel field modulated permanent magnet gear machine

Zhou

Yang

2020

IET Electric Power Applications

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In order to make more effective use of space in the electric machine, a novel field modulated permanent magnet gear (FMPMG) machine is proposed. The key design aspect of the proposed FMPMG machine is adopting an inner rotor configuration and a specially designed stator core, with fixed modulator pieces, to improve the fabrication feasibility and rotation reliability. Harmonic analysis with detailed theoretical derivation is performed and reveals that the modulator pieces fixed to the stator can modulate the flux density distribution as well and realise a magnetic‐gearing effect. The major parameters are designed and modelled by the 2D finite element method (FEM). First, based on the simulation analyses of the radial flux density distribution in the ‘pseudo’ outer and inner air gap, the specially designed stator is verified to create a nested magnetic‐gearing effect together with the rotor PMs. The back electromagnetic force and electromagnetic torque waveform are further analysed, and the results indicate that the proposed FMPMG machine is more suitable for use as a sinusoidal excitation drive. Finally, a prototype is fabricated for experimentation to further verify the theoretical and FEM simulative validity of the proposed FMPMG machine.

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Analysis and Testing of a Coaxial Magnetic Gearbox With Flux Concentration Halbach Rotors

Cited by 32 publications

References 10 publications

Characteristic Research on Double Rotor Permanent Magnet Motor With Irregular Halbach Array

Characteristic Research on Double Rotor Permanent Magnet Motor With Irregular Halbach Array

Magnetic field and electromagnetic performance analysis of permanent magnet machines with segmented Halbach array

Analysis and experimental verification of a novel field modulated permanent magnet gear machine

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