Prediction of No-Load Flux Density Distribution in Permanent Magnet Machines

Boules, Nady

doi:10.1109/tia.1985.349720

Cited by 164 publications

(77 citation statements)

References 3 publications

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“…One of these analytical methods is called the "subdomain" method and consists in solving directly the Maxwell's equations in the different subdomains, i.e., air-gap, stator slots and magnets, by the variables separation method [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…In magnetic field calculation of electrical permanent magnet machines, most authors consider a real direction of magnetization (parallel) [6][7][8][9][24][25][26][27][28]. They consider only one permanent magnet by pole.…”

Section: Introductionmentioning

confidence: 99%

“…Boules [6] is one of the first authors who consider parallel magnetization in analytical field calculation for slotless surfaced mounted permanent magnet machines. He formulates a two-dimensional (2-D) model in polar coordinates that utilizes the concept of equivalent current-carrying coils to determine the airgap flux density distribution.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analytical Model on Real Geometries of Magnet Bars of Surface Permanent Magnet Slotless Machine

Boutora¹,

Takorabet²,

Ibtiouen³

2016

PIER B

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Abstract-We present in this paper an analytical model for the calculation of the electromagnetic field in a slotless surface mounted permanent magnet machines. This model takes into account the two essential directions of magnetization of the magnets, namely tangential magnetization and radial magnetization. It especially accounts for the parallel form of the magnetization direction. The model uses equivalent currents on the surfaces of the magnets, and in an original way, it uses currents in all volume of the magnet. The model is validated by numerical results obtained with a free software of calculation of the electromagnetic fields (FEMM: Finite Element Method Magnetics) which uses the finite elements method and by an existing experimental structure. The model is extended to the magnets segmented in bars and separated. It is then extended to the shape of magnets close to parallepiped forms which are really used in large machines.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analytical Model on Real Geometries of Magnet Bars of Surface Permanent Magnet Slotless Machine

Boutora¹,

Takorabet²,

Ibtiouen³

2016

PIER B

View full text Add to dashboard Cite

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“…These ironless motors [1][4] differ from iron-core motors [5][6] because the last ones are used up to a few hundred of hertz. Even though ironless motors are less efficient than iron-core motors, they constitue technological solutions [7] [8] for avoiding the drawbacks of eddy currents that appear in iron-core motors.…”

Section: Introductionmentioning

confidence: 99%

Ironless permanent magnet motors: Three-dimensional analytical calculation

Ravaud

Lemarquand

2009

2009 IEEE International Electric Machines and Drives Conference

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Abstract-We present a three-dimensional expression of the magnetic torque exerted between a tile permanent magnet radially magnetized and a winding in ironless structures. Such an expression can be used for calculating the magnetic torque transmitted between the stator and the rotor of an ironless permanent magnet motor. The calculations are carried out without using any simplifying assumptions. Consequently, the expression of the torque obtained is exact whatever the magnet or winding dimensions. The ironless structure we consider in this paper is commonly used for high speed rotation devices in which eddy currents must be avoided. Indeed, it is noted that more and more structures are ironless because they offer promising perspectives.

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“…The problem of magnetically generated vibration has been addressed by other investigators. Boules [3] analytically predicted the flux density in permanent magnet machine. Sabonnadiere et al [4] calculated the magnetic force using the finite element method, while Lefevre et al [5] did so with finite difference method along with determining the dynamic reaction with FEM.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Magnetic Flux Density, the Magnetic Force and the Torque in a 3D Brushless DC Motor

Pakdel¹

2009

JEMAA

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As permanent magnet motors and generators produce torque, vibration occurs through the small air gap due to the alternating magnetic forces created by the rotating permanent magnets and the current switching of the coils. The magnetic force can be calculated from the flux density by finite element methods and the Maxwell stress tensor in cylindrical coordinates. In this paper the magnetic flux density, the magnetic force and the torque of a real three dimensional brushless DC motor are simulated using Maxwell 3 D V 11.1.

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Prediction of No-Load Flux Density Distribution in Permanent Magnet Machines

Cited by 164 publications

References 3 publications

Analytical Model on Real Geometries of Magnet Bars of Surface Permanent Magnet Slotless Machine

Analytical Model on Real Geometries of Magnet Bars of Surface Permanent Magnet Slotless Machine

Ironless permanent magnet motors: Three-dimensional analytical calculation

Analysis of the Magnetic Flux Density, the Magnetic Force and the Torque in a 3D Brushless DC Motor

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