Analytical Modeling of Slotless Eccentric Surface-Mounted PM Machines Using a Conformal Transformation

Jalali, Pezhman; Boroujeni, Samad Taghipour; Bianchi, Nicola

doi:10.1109/tec.2016.2640450

Cited by 31 publications

(11 citation statements)

References 26 publications

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“…Since MGDRMs have two rotating components, MEC is unsuitable for the design and optimization. Besides, the analytical model based on conformal transformation is very useful in predicting the airgap magnetic flux distribution by taking into account of the slotting effect [15][16][17]. This method cannot be applied in analyzing the magnetic field of MGDRMs, because the modulation poles on the modulator cannot be regarded as equipotential.…”

Section: Introductionmentioning

confidence: 99%

Analytical model for magnetic‐geared double‐rotor machines and its d–q ‐axis determination

Hong

Liu

Song

et al. 2020

IET Electric Power Applications

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This paper presents an analytical subdomain model for the prediction of various electromagnetic parameters of magnetic-geared double-rotor machine (MGDRM). By dividing the MGDRM into six subdomains and solving the Maxwell equations in polar coordinates for each region, the vector magnetic potential distribution can be derived. Subsequently, the flux density distribution, back electromotive force (EMF), and output torque, can be calculated. Furthermore, based on the proposed model, the equivalent d-q axis is elaborated. Also, the corresponding d and q inductance can be obtained. It proves that the MGDRM can be regarded as a non-salient-pole synchronous machine. Besides, the power factor of the MGDRM under i d =0 control is deduced and optimized for the different thicknesses of modulators. In addition, the demagnetization capability is analysed by adopting the subdomain model. Finally, the accuracy of proposed subdomain model for MGDRMs is validated via the finite-element method (FEM). Nomenclature A z Vector magnetic potential. B r , B θ Radial and tangential component of magnetic flux density. M , J Magnetization vector of magnets, Current density vector. μ 0 Magnetic permeability of vacuum. P, Q Number of stator slots and modulator pieces. P i Pole pair Number of inner rotor permanent magnets (PMs). β, γ, δ Modulator opening angle, stator slot width angle and slot opening angle. φ 0 , θ 0 Initial circumferential position of the inner rotor and modulator. θ i , θ j , J l Circumferential positions of PMs, i th modulator opening and j th slot opening, current density in the l th slot

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Section: Introductionmentioning

confidence: 99%

Analytical model for magnetic‐geared double‐rotor machines and its d–q ‐axis determination

Hong

Liu

Song

et al. 2020

IET Electric Power Applications

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“…• rotor eccentricity: a rotor is eccentric, when it is closer to one side of the stator than to the side that is diametrically opposite to it [20]; • air gap between the stator halves: such air gap is inevitable. It is caused by gluing the stator halves together.…”

Section: Introductionmentioning

confidence: 99%

Cogging torque in slotless permanent magnet machines

Vukotić

Rodić

Benedicic

et al. 2020

Journal of Electrical Engineering

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Slotless permanent magnet machines theoretically do not produce any cogging torque, provided the stator inner surface reluctance remains unchanged. However, a cogging torque may occur due to a change in the electromagnetic design following material cost reduction in the manufacturing process. When the electromagnetic design is changed to reduce the waste in the manufacturing process (stamping of the laminations) by dividing the stator toroidal ferromagnetic core into two equal parts, gluing them together introduces a very small non magnetic gap between them, which affects the stored magnetic energy along the circumference and consequently gives rise to occurrence of a cogging torque. Using the finite element method its value is analyzed analytically and verified by a laboratory measurement. Results of our work, presented in this paper, will help scientists and engineers to understand and avoid the causes for the occurrence of the cogging torque in designing slotless permanent magnet machines, where the design itself is subjected to the manufacturing process.

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“…In addition, equivalent virtual current is powerful in magnetic field calculation. It has been widely used to replace the PM and calculate the electromagnetic performance in many PM machines such as IPM machine [17], transverse flux machine [18], and eccentric SPM machine [19]. For the saturated SPM machine, Hanic et al combined the conformal mapping and LPMCM to analyze the airgap field [20]- [21] by using equivalent currents.…”

Section: Introduction Ermanent-magnetmentioning

confidence: 99%

On-Load Field Prediction of Surface-Mounted PM Machines Considering Nonlinearity Based on Hybrid Field Model

Wang

et al. 2019

IEEE Trans. Magn.

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Analytical Modeling of Slotless Eccentric Surface-Mounted PM Machines Using a Conformal Transformation

Cited by 31 publications

References 26 publications

Analytical model for magnetic‐geared double‐rotor machines and its d–q ‐axis determination

Analytical model for magnetic‐geared double‐rotor machines and its d–q ‐axis determination

Cogging torque in slotless permanent magnet machines

On-Load Field Prediction of Surface-Mounted PM Machines Considering Nonlinearity Based on Hybrid Field Model

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