An Accurate Subdomain Model for Magnetic Field Computation in Slotted Surface-Mounted Permanent-Magnet Machines

Zhu, Z. Q.; Wu, Lijian; Xia, Z.P.

doi:10.1109/tmag.2009.2038153

Cited by 376 publications

(221 citation statements)

References 60 publications

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“…One of them, relative permeance (RP) which is derived from the conformal mapping is adopted for considering stator's slotting effect [12][13][14]. The RP can be expressed as Fourier series.…”

Section: Slot Opening Effect On Air-gap Flux Densitymentioning

confidence: 99%

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Analysis of an Interior Permanent-Magnet Machines with an Axial Overhang Structure based on Lumped Magnetic Circuit Model

Seo¹,

Seo²

2016

Journal of Magnetics

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This paper shows a new magnetic field analysis of an interior permanent magnet (IPM) machines with an axial overhang structure wherein the rotor axial length exceeds that of the stator. The rotor overhang used to increase torque density of the radial flux machine is difficult to analyze because of extra consideration of axial direction, and thus it is general for machine designer to take 3-D finite element analysis (FEA) capable of considering both radial and axial complicated geometry in the machine. However, it requires too much computing time for preliminary design especially for optimization process. Therefore, in this paper a 2-D analytic method using a lumped magnetic circuit model (LMCM) is proposed to overcome the problem. For the analysis of overhang effect, the magnetic circuit is separated and solved from overhang and non-overhang regions respectively. For the validation of proposed concept, 3-D finite element analysis (FEA) is performed. From the analysis results, it is shown that our new proposed method presents good performance in terms of calculating electromotive force (EMF) and torque within a short time. Therefore, the proposed model can be useful in design of IPM with an overhang structure.

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Section: Slot Opening Effect On Air-gap Flux Densitymentioning

confidence: 99%

“…For integration of (13), (12) should be expressed by analytical equation. (14) where B n is n th order harmonics of radial air-gap flux density, p is the number of pole pair, and ω r is the mechanical rotor speed.…”

Section: Back-emf Calculation Considering Slotting Effectmentioning

confidence: 99%

Analysis of an Interior Permanent-Magnet Machines with an Axial Overhang Structure based on Lumped Magnetic Circuit Model

Seo¹,

Seo²

2016

Journal of Magnetics

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“…Moreover, it is less time consuming and sufficiently accurate. Numerous analytical approaches have been developed for the determination of slotted machine's magnetic field distribution, hence cogging torque [6][7][8][9][10][11][12]. These analytical methods depend on either magnetic equivalent reluctance model, conformal method, methods of images, or solution of governing equations by use of variable separable method.…”

Section: Introductionmentioning

confidence: 99%

“…Even at present, the analytical calculation of complex permeance function is still a problem of research. More accurate results are found by use of subdomain method of analysis, which solves governing equations in all subdomain including slots, air gap, and magnets region [10][11][12]. Most of these analytical methods are applicable to axial flux permanent magnet machines.…”

Section: Introductionmentioning

confidence: 99%

Semi-Analytical Model for Skewed Magnet Axial Flux Machine

Reza¹

2018

PIER M

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Abstract-High power density and torque capability are distinguished features of slotted axial flux permanent magnet machine. However, due to alternate placement of slot and teeth, the airgap permeance and airgap magnetic energy vary with angular position. Even in absence of current excitation, the magnetic variation with position results in cogging torque. This torque produces several undesirable phenomena such as mechanical vibration, acoustic noise, torque ripples, voltage ripples and speed ripple in machine performance. The severity is high for low speed, light load, and direct drive applications. Various design modifications such as slot skewing, magnet skewing, axillary slots, optimization of pole pitch to pole arc ratio and many more are reported for cogging torque mitigation. Any of these design modifications adversely affects the machine performance in terms of no load magnetic field distribution, linkage flux, and induced emf. In this paper, the effect of magnet skewing is investigated for dualrotor permanent magnet axial flux machine. The analytical model is developed for the determination of magnetic field distribution at no load. Three different types of open slots stators viz. type 1: trapezoidal Slot with trapezoidal teeth, type 2: Parallel slot with trapezoidal teeth, and type 3: trapezoidal slot with parallel teeth are used for the investigation of air-gap magnetic field density and cogging torque produced in machine. The analytically obtained results are compared with finite element analysis (FEA) for the validation.

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“…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%

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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An Accurate Subdomain Model for Magnetic Field Computation in Slotted Surface-Mounted Permanent-Magnet Machines

Cited by 376 publications

References 60 publications

Analysis of an Interior Permanent-Magnet Machines with an Axial Overhang Structure based on Lumped Magnetic Circuit Model

Analysis of an Interior Permanent-Magnet Machines with an Axial Overhang Structure based on Lumped Magnetic Circuit Model

Semi-Analytical Model for Skewed Magnet Axial Flux Machine

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

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