Analytical Modeling of Eccentric PM-Inset Machines With a Slotless Armature

Boroujeni, Samad Taghipour; Emami, Seyed Payam; Jalali, Pezhman

doi:10.1109/tec.2019.2892744

Cited by 25 publications

(13 citation statements)

References 19 publications

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“…However, the biggest issue in the computation is how to facilitate the eccentric motion. The advantages of analytical methods, such as clear physical concepts, fast calculation, and no restriction from the meshes make magnetic field analysis easy, especially when the eccentric rotation of the rotor leads to non-uniform air gap [5][6][7][8][9][10][11]. A model with analytical method only can hardly handle nonlinear problems such as the saturation of ferromagnetic materials, though.…”

Section: Introductionmentioning

confidence: 99%

A 2-D Hybrid FE Model With Double Air Gap Elements for Eccentric Magnetic Harmonic Gears

Zhang

2021

IEEE Access

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Eccentric magnetic harmonic gears with high gear ratios exhibit high torque densities. However, the revolution and rotation of the eccentric rotor increase the magnetic field analysis complexity. This paper presents a hybrid finite element approach of magnetic field analysis for magnetic harmonic gears. The eccentric air gap region has been divided into three parts: two uniform layers, adjoining the stator and the rotor respectively, are treated as air gap elements; one non-uniform middle layer, as a variable air gap permeance, is discretized by FE meshes similar to the stator and the rotor. Mesh reconstruction can be avoided because the annular cylindrical rings of the two air gap elements are introduced. The mixed eccentric motion of the rotor can be easily treated. In order to save the computational time an equivalent motion mode is introduced and the sliding surface technique is applied by which the coefficient calculation of the air gap elements only needs to be done once wherever the rotor moves. The torques are calculated from the flux densities of the air gap elements. A prototype test confirms the validity of the prediction, and the accuracy of the obtained results is evaluated with FEM.INDEX TERMS Hybrid finite element method, Double air-gap element, Eccentric magnetic harmonic gear This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication.

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Section: Introductionmentioning

confidence: 99%

A 2-D Hybrid FE Model With Double Air Gap Elements for Eccentric Magnetic Harmonic Gears

Zhang

2021

IEEE Access

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“…However, the accuracy of calculation results should be improved in further study. In [15][16][17], the concept of magnetization surface current (MSC) and equivalent boundary method is applied to the analytic calculation of rotor eccentric SPMSM. It has the advantages of easily modeling and solving.…”

Section: Introductionmentioning

confidence: 99%

Analytical modeling and study on noise characteristics of rotor eccentric SPMSM with unequal magnetic poles structure

Xia¹,

Yu²,

Dou³

et al. 2021

Turk J Elec Eng & Comp Sci

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The establishment of the analytical model of the rotor eccentric surface-mounted permanent magnet synchronous motor (SPMSM) with unequal magnetic poles structure will be beneficial to calculating the magnetic field and studying noise characteristics quickly. Based on the equivalent surface current (ESC) method and equivalent boundary method, the analytical model of the rotor eccentric SPMSM with unequal magnetic poles structure is proposed. During the modeling process, the magnetic field produced by a permanent magnet (PM) is obtained using the ESC method, and the effect on the air gap magnetic field, which arised from stator, is replaced with the concentric current sheet (CCS) magnetic field. And, the analytical results of the magnetic field are confirmed by FEM. According to the analytical model of the SPMSM, the effect on the noise characteristics, which resulted from rotor eccentricity, is researched. Moreover, the experiments of noise comparison are done. The results validate the validity of noise characteristic research. Then, the analytical model of the SPMSM is further verified.

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“…In [16], the authors introduced new concept of complex relative air-gap permeance related to analytical field calculations in surface PM motors, which is developed from conformal transformation of the slot opening and used to accurately calculate the air-gap field for both radial and tangential components of the flux density in the slotted air gap. In [17], an analytical model is developed for the prediction of the air gap flux density in the eccentric permanent magnet inset machines at no-load and on-load conditions, which is fast and accurate.…”

Section: Introductionmentioning

confidence: 99%

Analytical Method for Magnetic Field of Eccentric Magnetic Harmonic Gear

2020

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Eccentric magnetic harmonic gears (EMHG) can achieve high speed ratio transmission and large torque output by modulating the air gap length between permanent magnets (PM). The analytical method is based on the boundary perturbation method. The vector magnetic potential perturbation equation in the air gap region is established, and the general solution is obtained using the boundary conditions. According to the superposition principle, the air gap flux density of stator and rotor PMs acting alone is synthesized, and the electromagnetic torque and unbalanced magnetic pull are calculated. Last, we compare magnetic field distributions, electromagnetic torque and unbalanced magnetic pull computed by the analytical method with those obtained from finite-element method (FEM). INDEX TERMS Eccentric magnetic harmonic gear, analytical method, magnetic field, electromagnetic torque, FEM.

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Analytical Modeling of Eccentric PM-Inset Machines With a Slotless Armature

Cited by 25 publications

References 19 publications

A 2-D Hybrid FE Model With Double Air Gap Elements for Eccentric Magnetic Harmonic Gears

A 2-D Hybrid FE Model With Double Air Gap Elements for Eccentric Magnetic Harmonic Gears

Analytical modeling and study on noise characteristics of rotor eccentric SPMSM with unequal magnetic poles structure

Analytical Method for Magnetic Field of Eccentric Magnetic Harmonic Gear

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