New concept of permanent magnet excitation for electrical machines: analytical and numerical computation

Marinescu, M.; Marinescu, N.

doi:10.1109/20.123952

Cited by 60 publications

(24 citation statements)

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“…The first idea was based in the Halbach magnet array, where additional suitably-positioned magnet pieces may "guide" the flux through the magnet itself, thereby increasing its value [20]- [21]. Here, additional magnets are also utilized, but the flux takes an axial path by using an appropriate magnetic circuit configuration.…”

Section: The Axial Flux Concentration Conceptmentioning

confidence: 99%

Magnetic topology with axial flux concentration: a technique to improve permanent-magnet motor performance

Paiva

Silva

Nabeta

et al. 2017

J. Microw. Optoelectron. Electromagn. Appl.

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Section: The Axial Flux Concentration Conceptmentioning

confidence: 99%

Magnetic topology with axial flux concentration: a technique to improve permanent-magnet motor performance

Paiva

Silva

Nabeta

et al. 2017

J. Microw. Optoelectron. Electromagn. Appl.

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“…The Halbach array has a further advantage that the self demagnetization field is less than for conventional designs. The Halbach array can be used to produce external poles [9], or internal poles [10], [11], and the internal dipole concept is the subject of the present paper.…”

Section: -mentioning

confidence: 99%

Trapped-flux internal-dipole superconducting motor/generator

Hull

Sengupta²,

Gaines³

1999

IEEE Trans. Appl. Supercond.

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“…In addition, their coercive field and magnetic polarization allow one to use them in Halbach structures [1,2]. As a consequence, some judicious assemblies of magnets have been studied in order to create either intense magnetic fields in the air gap or to optimize the radial field shape in electrical machines [3][4][5]. More generally, we can say that such structures allow us to obtain intense magnetic fields that are required for creating great torques in magnetic couplings.…”

Section: Introductionmentioning

confidence: 99%

Discussion About the Magnetic Field Produced by Cylindrical Halbach Structures

Ravaud¹,

Lemarquand²

2009

PIER B

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Abstract-This paper uses a three-dimensional analytical approach based on the Coulombian model for studying the magnetic field produced by cylindrical Halbach structures.Such structures, commonly used in magnetic couplings or in electrical machines, are composed of tile permanent magnets with rotating magnetizations. Such assemblies of tile permanent magnets allow one to easily optimize the radial field shape in the air gap of electrical machines. In addition, Halbach structures can be used in magnetic couplings for improving the torque transmitted between the two rotors. Analytical studies dealing with the optimization of such structures generally use a twodimensional analytical approach for calculating either the magnetic field produced by tile permanent magnets or the forces exerted between them. These two-dimensional expressions are useful because they have a very low computational cost. However, their accuracy depends greatly on the structure dimensions. We propose in this paper to use a three-dimensional analytical model based on the Coulombian model for determining the exact shape of the magnetic field produced by a Halbach structure. Such an approach also allows one to determine the demagnetizing magnetic field inside the tile permanent magnets. This element of information is important for the design of tile permanent magnets. In addition, we show that some effects cannot be predicted with the linearized analytical model. This implies that a linearized dimensional optimization is not accurate. This study has been carried out without any simplifying assumptions. Therefore, the calculations of the three magnetic field components are exact for all points in space, whatever the magnet dimensions. We can say that such a three-dimensional analytical approach is a good alternative to a finite element one because it has a lower computational cost and is more accurate.

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New concept of permanent magnet excitation for electrical machines: analytical and numerical computation

Cited by 60 publications

References 1 publication

Magnetic topology with axial flux concentration: a technique to improve permanent-magnet motor performance

Magnetic topology with axial flux concentration: a technique to improve permanent-magnet motor performance

Trapped-flux internal-dipole superconducting motor/generator

Discussion About the Magnetic Field Produced by Cylindrical Halbach Structures

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