A Magnetic Gearbox With an Active Region Torque Density of 239 N·m/L

Uppalapati, K.; Calvin, Matthew; Wright, Jason D.; Pitchard, J.; Bird, Jonathan Z.

doi:10.1109/tia.2017.2779418

Cited by 49 publications

(16 citation statements)

References 18 publications

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“…Compared with the SPM rotor, the MG torque density can be improved by adopting the interior permanent magnet (IPM) rotor with flux focusing effect [6,7]. However, these IPM rotor structures are more complicated for manufacturing and assembling, and the flux focusing effectiveness may become minor due to the severe flux leakage when the MG overall diameter is small or the number of rotor poles is large.…”

Section: Rotor Structurementioning

confidence: 99%

“…After sustained research in recent decades, the MG topologies have been successively improved to achieve better performance [4][5][6]. To date, torque density over 230 kNm/m 3 has been reached in a MG prototype which adopts flux-focusing technique on rotors equipped with high energy rare earth magnets [7]. With the increasing torque density, the MGs are now being widely investigated to replace the conventional mechanical gears in various applications, such as wind and tidal turbines [8], marine propulsion [9] and so on.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Topologies and performance study of a variety of coaxial magnetic gears

Shen

Hao

et al. 2017

IET Electric Power Applications

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This study aims to provide a comprehensive study of various magnetic gears (MGs) with simple coaxial radial flux structure. A total of 15 topologies are first introduced, by either using various rotor structures or adding extra permanent magnets (PMs) on the magnetic modulation ring. Then, all topologies with ferrite magnets are parametrically optimised, aiming to compare and evaluate the performance of these MGs. The results show that the proposed MGs with dual consequent-pole PM rotors exhibit a higher torque density than the conventional coaxial MG. Therefore, magnetic field distribution, torque-angle characteristic and on-load torque performance of these promising MGs are analysed in detail, revealing their inherent superiorities. In addition, influence of magnet material on the MG performance are investigated with emphasis on the torque density and cost effectiveness. Finally, two MG prototypes are fabricated and tested to validate the analysis.

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Section: Rotor Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Topologies and performance study of a variety of coaxial magnetic gears

Shen

Hao

et al. 2017

IET Electric Power Applications

View full text Add to dashboard Cite

show abstract

“…In addition, this structure reduces the dimensions and the overall weight of the magnetic gear [27]. Second, torque density can be increased by insertion of the PMs inside the rotor, which is referred to as the interior permanent magnet (IPM) [28][29][30][31][32]. In addition, the other way of enhancement of the torque density is to change magnetization directions of PMs based on the Halbach PM arrays [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Design of Novel Structured High Torque Density Magnetic-Geared Permanent Magnet Machine

et al. 2021

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The main limitation of magnetic gears is their relatively low torque density. Therefore, a novel structured high torque density magnetic-geared permanent magnet (MGPM) machine, which combines the advantages of a conventional MGPM machine and magnetic gear to enhance the torque considerably and achieve low-speed high-torque operation, is proposed in this study. However, there are different structures for increasing torque of a machine. Therefore, in order to demonstrate the advantages of the proposed structure, it is compared with other structures, using the finite element method. Moreover, the proposed MGPM machine can transmit an additional 42.3% of torque density when compared with the conventional MGPM machine of the same size.INDEX TERMS Bi-directional flux modulating, bread-Loaf shaped permanent magnet, dual-layer permanent magnet excitations, electrical continuously variable transmission (E-CVT), Halbach permanent magnet arrays, MGPM machine, torque density.

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“…Meanwhile, the rotation of the harmonic filed can be synchronized with the permanent magnet, thus generating stable working torque between the rotors [6][7][8]. Compared with mechanical gear, CMG has the advantages of non-contact transmission, low noise, maintenance-free operation, and inherent overload protection [9,10]. Also, CMG usually has a higher torque density than the motor, so when coaxial magnetic gear and motor are integrated, the torque density of the whole system can be improved [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Different Structure of Magnetic Modulation Ring on the Torque Performance of Coaxial Magnetic Gear

Wang¹,

Xu²,

Ouyang³

et al. 2020

PIER M

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In coaxial magnetic gear (CMG), magnetic modulation ring is composed of a modulator and a connecting bridge. The torque performance of the magnetic gear is affected by the different structures of the magnetic modulation ring. In this paper, fifteen different kinds of magnetic modulation rings with different structures are proposed; they consist of three different shapes of modulators and five different locations of connection bridges. By using the two-dimensional finite element method (FEM), the magnetic flux density, magnetic line distribution, static torque, and steady-state torque of the CMG with different structures of magnetic modulation ring are analyzed. The results show that the innermost bridge has the least effect on the torque and torque ripple of the CMG, while the outermost bridge has the opposite effect. The torque capacity of the circular modulator and arc modulator is higher than that of the square modulator, and the circular modulator helps to reduce the inner torque ripple, while the square modulator helps to reduce the outer torque ripple. This paper can provide some references for the design of the magnetic modulation ring.

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A Magnetic Gearbox With an Active Region Torque Density of 239 N·m/L

Cited by 49 publications

References 18 publications

Topologies and performance study of a variety of coaxial magnetic gears

Topologies and performance study of a variety of coaxial magnetic gears

Analysis and Design of Novel Structured High Torque Density Magnetic-Geared Permanent Magnet Machine

The Influence of Different Structure of Magnetic Modulation Ring on the Torque Performance of Coaxial Magnetic Gear

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