Analytical Open-Circuit Magnetic Field Distribution of Slotless Brushless Permanent-Magnet Machines With Rotor Eccentricity

Rahideh, Akbar; Korakianitis, Theodosios

doi:10.1109/tmag.2011.2159987

Cited by 77 publications

(53 citation statements)

References 15 publications

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“…Subsequently, the back EMF induced in coil j can be analytically found using Faraday's law [5] E j = −N t ω dφ j dα (22) where N t is the number of turns of each coil. The back EMF of each phase can be obtained according to the connection of the coils of that phase.…”

Section: Non-overlapping Windingmentioning

confidence: 99%

“…The radial and tangential magnetic local traction acting on the stator surface can be obtained based on the Maxwell stress tensor since the permeability of the stator/rotor back-iron assumed to be infinity [5] …”

Section: Local Traction and Unbalanced Magnetic Forcesmentioning

confidence: 99%

“…Analytical magnetic field expressions have been utilized to calculate the PM eddy-current loss with(out) the current penetration effect [4,14,28], cogging torque [13,32], reluctance torque, instantaneous torque [27,30], back EMF waveforms [5,24,27], self-/mutual-inductances [2,27], and UMFs [5,33].…”

Section: Introductionmentioning

confidence: 99%

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Analytical Calculations of Electromagnetic Quantities for Slotted Brushless Machines With Surface-Inset Magnets

Rahideh¹,

Moayed-Jahromi²,

Mardaneh³

et al. 2017

PIER B

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Abstract-In this paper, two-dimensional (2-D) analytical magnetic field calculations are used to compute crucial quantities of Brushless permanent-magnet (PM) machines with surface-inset PMs. The analytical magnetic field distribution is based on the subdomain technique in which the slotting and tooth-tip effects have been considered. It includes both different magnetization patterns (e.g., radial, parallel and Halbach) and different spatial distribution of winding (e.g., concentrated and distributed with one or more layers). The saturation effect of the magnetic circuit is neglected. In this investigation, the phase and line induced back electromotive force (EMF) waveforms, electromagnetic/cogging/reluctance torques, self-/mutual-inductances and unbalanced magnetic forces (UMFs) have been analytically calculated. The analytical expressions can be used for Brushless machines having surface-inset PMs with any radius-independent magnetization pattern. In this study, two slotted Brushless PM machines with surface-inset PMs have been selected to evaluate the efficacy of the analytical expressions by comparing the results with those obtained by the finite-element method (FEM). One of the case studies is a 9-slots/8-poles Brushless DC (BLDC) machine with radially magnetized PMs, non-overlapping all teeth wound winding and six-step rectangular armature current waveforms. The other is a 15-slots/4-poles Brushless AC (BLAC) machine with Halbach magnetization PMs, double-layer overlapping winding and sinusoidal armature current waveforms.

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Section: Non-overlapping Windingmentioning

confidence: 99%

Section: Local Traction and Unbalanced Magnetic Forcesmentioning

confidence: 99%

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Analytical Calculations of Electromagnetic Quantities for Slotted Brushless Machines With Surface-Inset Magnets

Rahideh¹,

Moayed-Jahromi²,

Mardaneh³

et al. 2017

PIER B

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“…This step has a lot of similarities with the first step of the analysis of the unbalanced magnetic pull in electric motors done in [17] and [18]. The analytical expressions of the magnetic field created by an off-centered rotor, which are used in this paper were derived in [19].…”

Section: Modeling Approachmentioning

confidence: 99%

Null-Flux Radial Electrodynamic Bearing

2014

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The design of a new electrodynamic bearing is often based on the intuition and experience of its inventor. This paper proposes general guidelines for the design of null-flux electrodynamic centering bearings based on the interaction between a short circuited winding and permanent magnets. These design guidelines are deduced from an analytical analysis of the magnetic flux, and forces in a bearing with a radial magnetic field and an arbitrary winding. Considering that the electromotive force (EMF) in the winding should cancel when the rotor is centered and should appear as the rotor is off-centered, inducing a current in the winding and therefore a centering force on it, the design guideline is to have q = p ± 1 where q and p are the number of pole pairs of the winding and permanent magnets, respectively. This guideline is validated by finite element simulations and some additional comments are made on the phase shift between the induced EMF and current that maximizes the centering force on the bearing.

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“…Kim and Lieu [15] have formulated the opencircuit field distribution of radial magnetization PM motors with rotor eccentricity using the perturbation method. Rahideh and Korakiantis [48] have extended the method proposed in [15] to five other types of magnetization and also presented the armature reaction field calculation of slotless brushless machines with surface inset PM structure [50]. A semi-analytical open-circuit field distribution based on the equivalent-coil method has been presented for slotless brushless PM motors with radius-dependent magnetization patterns [19].…”

Section: Introductionmentioning

confidence: 99%

Analytical calculation of open-circuit magnetic field distribution of slotless brushless PM machines

Rahideh

Korakianitis

2013

International Journal of Electrical Power & Energy Systems

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Analytical Open-Circuit Magnetic Field Distribution of Slotless Brushless Permanent-Magnet Machines With Rotor Eccentricity

Cited by 77 publications

References 15 publications

Analytical Calculations of Electromagnetic Quantities for Slotted Brushless Machines With Surface-Inset Magnets

Analytical Calculations of Electromagnetic Quantities for Slotted Brushless Machines With Surface-Inset Magnets

Null-Flux Radial Electrodynamic Bearing

Analytical calculation of open-circuit magnetic field distribution of slotless brushless PM machines

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