Comparison of Two Different Interior Permanent Magnet Type Low-speed Rotor Structures of Axial-Flux Magnetic Gear

Dai, Boqun; Nakamura, Kenji; Suzuki, Yuma; Oishi, Y.; Tachiya, Yuichi; Kuritani, Kingo

doi:10.23919/icems50442.2020.9290886

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…In addition to the radial-flux structure, the FMMG can be built in the axial-flux frames [65][66][67][68][69][70][71][72][73][74] as shown in Figure 11. The axial-flux FMMG is preferred particularly in applications requiring flat outside shapes and hermetic isolation between the input and output shafts [75].…”

Section: Direction Of Magnetic Fluxmentioning

confidence: 99%

A review on the field‐modulated magnetic gears: Development status, potential applications, and existent challenges

Yan,

Li,

Wang

et al. 2023

IET Electric Power Appl

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As a type of magnetic device being able to realize contact‐free power transmission together with sufficient volumetric torque density, the field‐modulated magnetic gear (FMMG) has become a promising alternative to the mechanical gear having rigid construction yet suffering lots of issues generated by the continuous teeth friction. The conventional magnetic gears (MGs) that behave as simple copies of their mechanical counterparts and can be roughly defined as origination of the FMMG are briefly introduced at first. Subsequently, the topology and material advancements proposed to improve operational performance of the FMMG are comprehensively summarised so as to clarify its current development status. Finally, potential applications of the FMMG due to its inherent advantages are compared against the existent challenges. The review aims to provide referable guidelines for researchers working at the field of high‐performance MGs.

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Section: Direction Of Magnetic Fluxmentioning

confidence: 99%

A review on the field‐modulated magnetic gears: Development status, potential applications, and existent challenges

Yan,

Li,

Wang

et al. 2023

IET Electric Power Appl

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show abstract

“…× 100(%), ............................ (7) where the sum of the iron loss of the pole-pieces and the rotor yokes is Wiron, the eddy current loss in the magnets is Weddy, and the mechanical output of the magnetic gear is Pout, which calculated by = , ................................................................. (8) where the angular velocity and the average torque of the low-speed rotor are l and l, respectively.…”

Section: Comparison Of Efficiencymentioning

confidence: 99%

Comparison of Two Different Interior Permanent Magnet Type Low-speed Rotor Structures of Axial-Flux Magnetic Gear

Dai

Nakamura

Suzuki³

et al. 2021

IEEJ Journal IA

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Magnetic gears have beneficial features such as low vibration and maintenance-free owing to no mechanical contacts. Among the several types of the magnetic gears, a flux-modulated type magnetic gear has a higher torque density than the other types. Thus, it is expected to be put into practical use. Previous studies have verified that an interior permanent magnet (IPM) structure rotor can reduce the eddy current loss in magnets. In this study, IPM rotor structures proper to a flux-modulated type axial-flux magnetic gear (AFMG) were investigated. Two types of IPM low-speed rotor structures, one is a spoke-shape and the other is a segment-shape, were compared in terms of torque and efficiency. Furthermore, to prove the validity of the proposed rotor structure, prototype tests were conducted.

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“…Recent technological improvements and operational measures have been directed toward the design and topology optimization of magnetic gears in order to maximize the transmitted torque and power, as well as to reduce permanent magnets' usage [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. Magnetic field distributions determine the operational characteristics of MGs, such as the magnetic torque densities, losses, cogging and ripple torque, and efficiency [23].…”

Section: Introductionmentioning

confidence: 99%

“…Higher torque densities are exhibited by magnetic harmonic gears [21]. Various field-flux MGs have been studied, among which axial [27,29], coaxial [15,28,31], radial [30], and linear [31] MGs have been widely considered. An important criterion for determining the optimal construction of a coaxial magnetic gear is an investigation of its harmonic spectrum [28].…”

Section: Introductionmentioning

confidence: 99%

Design Aspects of Conical Coaxial Magnetic Gears

2023

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In this paper, a new design of a conical coaxial magnetic gear was proposed. Conical magnetic gears are considered a logical link between the radial- and axial-field coaxial designs. The modeling of magnetic torques based on the 3D finite element method was developed. The design parameter variations of the conical coaxial magnetic gear were determined and discussed. The magnetic torque density was calculated and compared with that of a cylindrical coaxial magnetic gear with the same size and materials used. An optimal cone angle based on the air-gap length was proposed. Multistage conical coaxial magnetic gears were proposed as a sequence of coupled rotors with increased torque density and reduced magnetic reluctance. The proposed conical coaxial magnetic gears are more compact in size and suitable for integration with electrical machines and variable transmissions.

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Comparison of Two Different Interior Permanent Magnet Type Low-speed Rotor Structures of Axial-Flux Magnetic Gear

Cited by 5 publications

References 3 publications

A review on the field‐modulated magnetic gears: Development status, potential applications, and existent challenges

A review on the field‐modulated magnetic gears: Development status, potential applications, and existent challenges

Comparison of Two Different Interior Permanent Magnet Type Low-speed Rotor Structures of Axial-Flux Magnetic Gear

Design Aspects of Conical Coaxial Magnetic Gears

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