Transfer Torque Performance Comparison in Coaxial Magnetic Gears With Different Flux-Modulator Shapes

Kim, Sung Jin; Park, Eui-Jong; Jung, Sang-Yong; Kim, Yong-Jae

doi:10.1109/tmag.2017.2663429

Cited by 21 publications

(6 citation statements)

References 5 publications

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“…For the next time, the research on magnetic gear mainly focuses on improving torque density and practicability. From changing the shape of the magnetic ring to optimizing the parameters of the magnetic gear has become a hot spot in this field [12]- [15], aiming at improving the torque density of the magnetic gear. In order to make the magnetic gears no longer confine themselves to fixed ratios, the magnetic gears with variable transmission ratios are proposed in literature [16] to make them more suitable for variable speed electric vehicles and wind turbines, thus increasing the practicability of magnetic gears.…”

Section: Introductionmentioning

confidence: 99%

A New Structure for the Magnetic Gear

et al. 2019

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In this paper, a new structure for increasing the magnetic gear torque is proposed, which has high torque density and high mechanical properties. The permanent magnets (PMs) of the outer rotor are spoked and magnetized along the tangential direction. The PMs of inner rotor are the surface-mount type and magnetized in the radial direction. The PMs are fixed in the inner and outer rotors' iron yoke that the aim is to keep the PMs from falling off during the rotation. In order to reduce the amount of iron, it is considered to slot on the outer rotor. The two-dimensional finite element method is used for simulating the proposed model. The magnetic field and electromagnetic torque of the magnetic gear are calculated. Compared with the conventional magnetic gear, the results show that the torque transmission capability of the proposed magnetic gear can be substantially improved. INDEX TERMS Magnetic gear, permanent magnets (PMs), magnetic field, electromagnetic torque, finite element method.

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Section: Introductionmentioning

confidence: 99%

A New Structure for the Magnetic Gear

et al. 2019

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“…The magnetic adjusting ring can modulate the magnetic field generated by the PMs, and its different shapes have different effects. Reference [17] compares the effects of different shapes of magnetic adjusting rings on the output torque characteristics…”

Section: Introductionmentioning

confidence: 99%

Loss Analysis of Magnetic Gear with Slotted in Magnetic Modulation Ring

Tan

Liu

Rao

et al. 2023

Trans. Electr. Mach. Syst.

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In order to improve the operation efficiency of coaxial magnetic gear (CMG), in this paper, a CMG model with slotted in magnetic modulation ring is proposed. In this model, the permanent magnets (PMs) of internal and external rotors are distributed in Halbach array, the inner rotor PMs are equally divided into 3 small pieces, and the outer rotor PMs are equally divided into 2 small pieces. At the same time, the static magnetic modulation ring iron blocks are slotted, each iron block has 3 slots, the width of the slot is 0.4°, and the depth of the single side slot is 1mm. Finally, a two-dimensional model is established, and the eddy current loss and iron loss of the model are optimized, compared with the conventional CMG model, it is found that the changed pattern can increase the internal and external output torque by 4% and 4.12%, respectively. The eddy current loss is reduced by 66.57%, and the iron loss is reduced by 8.9%, which significantly improve the operation efficiency of the CMG.

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“…In [9], a CMG magnetized by Halbach array is proposed, and its performance is analyzed. The research on CMG gradually changes from changing the topology to optimizing the parameters of CMG, and analyzes the torque output characteristics of the magnetic ring of magnetic gear under different shapes [10]. Reference [11] proposed a new CMG model, which contains two magnetic flux modulation rings, an inner and an outer magnetic flux modulation ring, and the results show that this model has the superiority of high torque.…”

Section: Introductionmentioning

confidence: 99%

A Novel High Performance Magnetic Gear with Auxiliary Silicon Steel Sheet

Tan

Jing

2022

Trans. Electr. Mach. Syst.

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Magnetic gear is a transmission device with novel structure. It uses the principle of magnetic field modulation to transmit torque. In view of the magnetic leakage of the magnetic gear in the process of rotation and cannot be eliminated, a magnetic gear model with auxiliary silicon steel sheet is proposed. Based on the conventional magnetic gear structure, the silicon steel sheet is placed outside the permanent magnet of the outer rotor. The magnetization mode of the outer rotor permanent magnet is tangential magnetization, and the spoke structure is adopted, and the inner rotor PMs is surface mounted and magnetized in the radial magnetization. The improved model is simulated by finite element method under three-dimensional conditions, and the electromagnetic performances of the model are optimized. Compared with the conventional magnetic gear model, the improved model has good performance, which improves the transmission capacity of output torque and reduces torque ripple. It is a great significance to improve the performance of magnetic gear.

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Transfer Torque Performance Comparison in Coaxial Magnetic Gears With Different Flux-Modulator Shapes

Cited by 21 publications

References 5 publications

A New Structure for the Magnetic Gear

A New Structure for the Magnetic Gear

Loss Analysis of Magnetic Gear with Slotted in Magnetic Modulation Ring

A Novel High Performance Magnetic Gear with Auxiliary Silicon Steel Sheet

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