An Iterative Magnetomechanical Deflection Model for a Magnetic Gear

Uppalapati, K.; Bird, Jonathan Z.

doi:10.1109/tmag.2013.2283018

Cited by 32 publications

(15 citation statements)

References 13 publications

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“…However, further improvements in torque density are still needed in order to make them competitive with mechanical gearboxes. The mechanical assembly of the MG is perhaps one of the most challenging aspects of designing a MG and the central inner steel segments, called the cage rotor in this paper, are particularly difficult to design as they carry high torque and experience large oscillatory radial and azimuthal forces [5].…”

Section: Introductionmentioning

confidence: 99%

A low assembly cost coaxial magnetic gearbox

Uppalapati

Kadel

Wright

et al. 2016

2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC)

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This paper presents the design investigation and experimental testing of a flux-focusing magnetic gearbox with a three piece laminated rotor structure. Each rotor is made of a single lamination stack held together via thin lamination bridges. It is calculated that mechanical bridges reduces the torque density from 156Nm/L to 139Nm/L (a reduction of 11%). The experimentally measured torque density is shown to be only 95Nm/L because the magnets were demagnetized during testing.

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Section: Introductionmentioning

confidence: 99%

A low assembly cost coaxial magnetic gearbox

Uppalapati

Kadel

Wright

et al. 2016

2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC)

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“…This deflection due to magnetic forces is highly dependent on the mechanical properties of the pole pieces themselves and their supporting structure. Furthermore, as the pole pieces deflect, they will experience new magnetic loads which lead to further deflections [20], [31]. Proper assessment of this is likely to require an iterative solution such as [31] and can only be meaningfully undertaken with a full mechanical design.…”

Section: Monte Carlo Analysismentioning

confidence: 99%

“…Furthermore, as the pole pieces deflect, they will experience new magnetic loads which lead to further deflections [20], [31]. Proper assessment of this is likely to require an iterative solution such as [31] and can only be meaningfully undertaken with a full mechanical design. Therefore, for the purpose of this study, the position distributions have also been assumed to be normally distributed with a three-sigma value of 0.4 mm for the radial error and 0.4 deg for the tangential error.…”

Section: Monte Carlo Analysismentioning

confidence: 99%

A Monte Carlo Analysis of the Effects of Geometric Deviations on the Performance of Magnetic Gears

Leontaritis

Nassehi

Yon

2020

IEEE Trans. on Ind. Applicat.

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Magnetic gears offer several advantages over mechanical transmissions. However, across a broad range of research studies, their practical performance has not matched design predictions. Even with extensive 3D Finite Element Analysis (FEA), large discrepancies of 4% to 10% can existusually attributed to manufacturing error. Research studies typically assume ideal realization of the prototype geometry while employing basic, poorly characterized manufacturing processes in the hardware development. Geometric deviations due to manufacturing error are difficult to predict and inherently random. Therefore, their effect needs to be assessed through a statistical approach, which requires a rapid but accurate model of the gear. This paper assesses the effect of geometric error on the performance of a magnetic gear using a new computationally efficient asymmetric analytical model to conduct a Monte-Carlo simulation. The analytical technique is validated by comparing the results with a finite element solution and very close agreement is observed. By repeatedly analyzing the gear, with the position and size of each pole piece independently varied each time, a resultant distribution of performance can be derived. It is also shown that, for this case study, the distribution derived using the analytical model can be scaled to match the equivalent, but much more computationally onerous, FEA based solution. A predicted statistical distribution of a gear's performance, based on a set of manufacturing tolerances, would provide designers with a more realistic estimate of a gear's capability than an idealized analysis. This will be increasingly important as magnetic gears become more widely adopted.

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“…[4]. Since then, topologies of flux focusing MG, axial MG, linear MG, transverse MG, interior PM rotor MG, consequent-pole MG [5][6][7][8], etc. have been developed.…”

Section: Introductionmentioning

confidence: 99%

“…Further, several modified topologies have been designed for simplifying the mechanical construction [15]. Much more than this, some other machines, including memory machines [16], fault-tolerant machines, consequent-pole machines, double stator machines, and linear machines [17,18] can also be combined with various MGs, thus matching with the low-speed motion and adopting the high-speed Outer radius of MOR core 88.6 mm R 5 Inner radius of MIR core 91.6 mm R 6 Outer radius of MIR core 97.6 mm R 7 Outer radius of PMs on MIR 103.6 mm R 8 Inner radius of FPs 104.4 mm R 9 Outer radius of FPs 116.4 mm R 10 Inner radius of PMs on LR 117.2 mm R 11 Inner radius of LR core 123.7 mm R 12 Outer radius of LR core 130.7 mm L 1 Axial length of PMBM 60 mm L 2 Axial length of MG 40 mm motor/generator design. In Ref.…”

Section: Introductionmentioning

confidence: 99%

Design, analysis, and realization of a magnetic force transmission PM brushless motor

Jing

Zhang

Ying

et al. 2018

IEEJ Transactions Elec Engng

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This paper proposes a novel direct-driving motor that successfully embeds a permanent magnet brushless motor (PMBM) into a concentric magnetic gear (CMG). The PMBM and CMG share a common high-speed rotor. In order to reduce the flux harmonics and get high torque density, Halbach arrays are employed to arrange the PM's poles on each side of the rotor, which completely makes the internal PMBM field and the external CMG field decoupled and improves the magnetic field characteristic. The results of finite element computation show that the proposed motor with Halbach arrays has over 7.5% higher torque density and that the cogging torque reduces to 1/20 that of a conventional radial magnetization motor; moreover, in the test, the back-EMF waveform is closer to a sine wave and the three-phase current waveforms show good agreement between the simulated and experimented results under the same load. The torque ripple is small and the dynamic performance is good. At the same time, the efficiency at the rated point is very close to the experimental one, which validates the effectiveness of the design method for the PMBM in the CMG.

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An Iterative Magnetomechanical Deflection Model for a Magnetic Gear

Cited by 32 publications

References 13 publications

A low assembly cost coaxial magnetic gearbox

A low assembly cost coaxial magnetic gearbox

A Monte Carlo Analysis of the Effects of Geometric Deviations on the Performance of Magnetic Gears

Design, analysis, and realization of a magnetic force transmission PM brushless motor

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