Analysis and development of an axial flux magnetic gear

Johnson, Matthew; Shapoury, Alireza; Boghrat, Pedram; Post, Michael L.; Toliyat, H.A.

doi:10.1109/ecce.2014.6954210

Cited by 24 publications

(11 citation statements)

References 11 publications

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“…All of these works [3][4][5][6][7][8][9][10][11][12] are consistent when it comes to the limitations caused by axial forces. They point to the need to reduce axial forces and to ensure appropriate gear rigidity as early as at the design phase, also taking the bearing arrangement into account.…”

Section: Introductionmentioning

confidence: 62%

“…The appearance of a study [3] on a group of AFMGs was only a matter of time. This subject has been continued in papers [4][5][6][7][8][9][10][11], wherein a number of analyses concerning the principles of operation and the design aspects of these gears, largely supported by measurements, were presented. Given the nature of the phenomena in the mentioned group of MGs, the majority of the papers employ 3D numerical models; however, the authors of Ref.…”

Section: Introductionmentioning

confidence: 99%

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Forces in Axial Flux Magnetic Gears with Integer and Fractional Gear Ratios

et al. 2021

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This paper presents a comparison of two variants of an axial flux magnetic gear (AFMG), namely, with integer and fractional gear ratios. Based on calculations derived with the use of three-dimensional numerical models, the torque characteristics of the analyzed AFMGs are computed and verified on a physical model. The greatest emphasis is put on the detailed decomposition and analysis of local forces in modulator pole pieces (also used in the structural analysis) within the no-load and maximal load conditions. The authors also describe the unbalanced magnetic forces (UMF) in the axial and radial directions resulting from the construction of the considered AFMGs variants, and their possible effects in the context of the use of additive manufacturing (AM) in prototypes. The paper also proposes an effective method for limiting the axial strain by using the asymmetry of the air gaps, which slightly reduces the torque transmitted by AFMGs. Finally, a static strength analysis was presented that allows us to assess the effects of local forces in the form of modulator disc deformation for selected cases of air gap asymmetry.

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Section: Introductionmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Forces in Axial Flux Magnetic Gears with Integer and Fractional Gear Ratios

et al. 2021

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“…Mezani et al [13] first demonstrated the performance of a 5.75:1 axial flux MG and calculated that a 70 N·m/L torque density could be achieved when using a 200 mm outer diameter. Subsequently, Johnson et al [14] and Hirata et al [15] experimentally studied surface‐mounted axial MGs, however, both designs did not achieve torque densities greater than equivalent direct‐drive generators. For instance, the axial surface‐mounted MG design tested by Johnson et al had a 6.67:1 gear ratio with a 5 mm air‐gap, the resulted torque density was only 22 N·m/L.…”

Section: Introductionmentioning

confidence: 99%

Designing and experimentally testing a flux‐focusing axial flux magnetic gear for an ocean generator application

Kouhshahi¹,

Acharya

Calvin

et al. 2019

IET Electric Power Applications

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The torque density characteristics for an axial flux magnetic gear using a flux-focusing topology is experimentally studied when using neodymium iron boron (NdFeB) rare-earth magnets. A geometric parameter sweep analysis was utilised in order to maximise both the calculated volumetric and mass torque density. The calculated torque and torque density was 628.6 N•m and 173.02 N•m/L while the experimentally measured torque and resultant torque density was 553.2 N•m and 152.3 N•m/L. Fig. 2 Axial flux density, B z , near the fixed rotor 3 due to magnets only on the high-speed rotor (rotor 1) with and without the n 2 = 25 LSR slots

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“…It is well known that the mechanical gears can achieve a high torque density but always suffer from some inherent problems, which actually causes a higher use-cost. In contrast, the magnetic gear (MG) offers significant advantages of reduced noise, minimum vibration, free from maintenance, improved reliability, and inherent overload protection [1], thus being promising alternative to the mechanical gears in the applications of electric vehicles [2], wind power generation [3], and low-speed high-torque reciprocating applications [4]. In [5], the development status of MGs, including the converted and field-modulated topologies, has been reviewed.…”

Section: Introductionmentioning

confidence: 99%

Analysis, design and experimental verification of a coaxial magnetic gear using stationary permanent‐magnet ring

Cheng

Wang

2017

IET Electric Power Applications

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This study presents the analysis and experimental verification of a coaxial magnetic gear (CMG) for speed-change transmission. The key design of this CMG is to adopt a stationary permanent-magnet (PM) ring between the inner and outer rotors, aiming at removing the PMs and only retaining the salient-pole-iron on the outer rotor to improve its mechanical reliability. Meanwhile, due to a large equivalent magnetic clearance promoting low torque ripples, the proposed CMG can offer the advantages of achieving a consistent speed ratio and stable transmission within the entire pull-out torque range. By using the two-dimensional finite element method, the detailed parametric analysis and static characteristics of the proposed CMG are performed to set up its design criteria. Moreover, a quantitative comparison with a conventional CMG is conducted, and a prototype is also fabricated for experimentation to verify the validity of the proposed CMG.

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Analysis and development of an axial flux magnetic gear

Cited by 24 publications

References 11 publications

Forces in Axial Flux Magnetic Gears with Integer and Fractional Gear Ratios

Forces in Axial Flux Magnetic Gears with Integer and Fractional Gear Ratios

Designing and experimentally testing a flux‐focusing axial flux magnetic gear for an ocean generator application

Analysis, design and experimental verification of a coaxial magnetic gear using stationary permanent‐magnet ring

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