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By analyzing the working principle of magnetic gear in the axial magnetic field, the design method of the active wheel and the driven wheel structure of the magnetic gear reducer in axial magnetic ...
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The torque of magnetic coupling with different magnetic poles has been investigated by theoretical computations with two dimensional modeling processes of finite element analysis. The torque is sensitive to the number of magnetic poles, the material of the magnetic gears, and the distance between the magnetic gears. For a 2 mm …
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This paper proposes a 3-D analytical model of the air-gap magnetic field for the AFPMC. The analytical model is based on the separation of variables method to …
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Halbach magnet arrays to axial field magnetic gears. It is found that Halbach arrays decrease the flux density in the adjacent back iron, allowing the thickness of these yokes …
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This paper proposes two axial-flux permanent magnet (AFPM) machines, i.e., NS and NN type, which all have the same stator and rotor structures but the different magnetic circuits. Since both PM magnetomotive force (MMF) and armature reaction MMF of the proposed AFPM machines are modulated by H-type armature stator, more field …
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Magnetic gears transmit torque by noncontact magnetic coupling rather than meshed mechanical gear teeth. In contrast to traditional mechanical gear mechanisms, non-contact magnetic gear mechanisms ...
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The paper describes an axial-field topology of magnetic gear, which is particularly suitable for applications which require a hermetic isolation between the input and output shafts, such as pumps for use in the chemical/pharmaceutical, food, and aerospace industries. It is shown that a torque density in excess of 70kNm∕m3 can be …
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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 …
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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.
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Axial Magnetic Gear. When it comes to the axial magnetic gear, its operating principle is the same as that of the coaxial magnetic gears described above. In this design, the rotors are stacked in an axial direction on top of each other rather than in the radial direction, with a small air-gap separation.
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The disadvantages of mechanical gear can be replaced by the advantages of magnetic gear related to transferring torque without mechanical touch, no gear lubrication, low mechanical loss, low vibration, and intrinsic overload protection. From the types of magnetic gear, coaxial magnetic gear is the most developed type. Halbach permanent …
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"Dynamic Analysis of Planetary-Type Magnetic Gear Based on Reluctance Network Analysis." IEEE Transactions on Magnetics 47 (10): 2414-7. Wu, Y.-C., and Jian, B.-S. 2014. "Magnetic Field Analysis of a Coaxial Magnetic Gear Mechanism by Two-Dimensional Equivalent Magnetic Circuit Network Method and Finite-Element Method."
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The numerical analysis and calculation of magnetic field is one of the key issues for designing the magnetic drive mechanisms. This paper discusses the method of finite element analysis of the magnetic field based on ANSYS software, analyzes and simulates the magnetic field in the axial magnetic drive mechanism of the latest textile twisting …
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The AFFSCM is composed of an axial field flux-switching permanent magnet machine (AFFSPMM) and magnetic gear. Therefore, it has the advantages of a compact structure, a large power/torque density, and a wide speed regulation range. First, the topology and magnetic modulation mechanism of the AFFSCM are investigated in …
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Cycloidal MGs [6-9] can simultaneously operate with a high torque density and high gear ratio; however, the radial cycloidal typology uses an eccentric air-gap, and this results in a large eccentric radial force that can seriously degrade the bearing life.Davey proposed and experimentally tested a 30:1 axial cycloidal typology in [] which holds …
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Compared to the work [13], special attention is given to the application of rectangular magnets to reduce the NdFeB magnetic material used in axial magnetic gears. Unlike radial topology, axial magnetic gear does not require magnetic lengths in the magnetic flux region. They require an axially strong magnetic flux.
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Co-axial magnetic gears were analyzed by ... According to the magnetic gear field modulation mechanism and the differential transmission method, a differential multi-stage coaxial magnetic gear ...
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This paper proposes the electromagnetic modeling, prototype realization and test validation of a new triple-speed coaxial magnetic gear (TSCMG) for high torque/volume applications. The proposed magnetic gear is comprised of three rotors: inner rotor, middle rotor and outer rotor. The middle rotor has been changed to a new single-layer structure. Also, the …
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magnetic arrays has been applied to radial field magnetic gears to improve torque density and reduce torque ripple [9]-[11]. However, to the authors' knowledge, Halbach arrays study employs parametric 3D finite element (FE) simulations to analyze the benefits obtained by incorporating Halbach arrays into axial field magnetic gears. Fig. 1(a).
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To improve the performance of low-speed large-torque direct drive systems in limited space, an axial field flux-switching composite machine (AFFSCM) is proposed …
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This paper introduces a multi-objective optimal design for an axial magnetic gear (AMG). In this study, the condition for high torque density and low cogging torque was deduced while the cost of the active …
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In this study, we analyzed a cylindrical coaxial magnetic gear. The present gear mechanism was investigated based on the finite element and the magnetic image methods. The torque efficiency was investigated in terms of the depth of the magnetic gear along the axial direction by using finite element software package COMSOL.
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Magnetic gears (MGs) offer many advantages over mechanical ones due to their contactless mechanism of torque transfer. With the flourish of this new avenue of research, a new breed of MGs has been ...
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This paper presents a two-dimensional (2-D) equivalent magnetic circuit network method to predict the magnetic field distribution of a coaxial magnetic gear …
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Axial magnetic gears, recognized for their high torque at low speeds, face significant challenges, such as magnetic leakage and torque ripple, which impede their transmission stability and efficiency. To address these challenges, this paper introduces an innovative H-type demagnetization ring magnetization axial magnetic gear. This axial …
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From the types of magnetic gear, coaxial magnetic gear is the most developed type. Halbach permanent-magnet arrangement in coaxial magnetic gear mechanism can …
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The performances of three types of magnetic gears (MGs), which are radial-flux MGs, transverse-flux MGs, and axial-flux MGs, are quantitatively analyzed and compared using 3-D finite-element ...
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This study presents the quantitative modeling of large deflections in emerging magnetic soft continuum robots (MSCRs) containing embedded hard-magnetic particles within nonuniform magnetic fields. The theory of hard-magnetic elastica is …
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Recent developments in the field of magnetic gear and magnetic gearing machines have opened up innumerable opportunities for engineers and researchers. Conventional mechanical gears require direct mechanical contact between the drive and driven toothed wheels, which gives rise to problems such as wear, breakages and noise. Generally, the …
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2.2 Mechanism analysis of electromagnetic force. During the operation of PM machines, two types of electromagnetic force are present. (1) The electromagnetic forces arise at the interface of different media; (2) The electromagnetic force generated by the current-carrying conductor within the magnetic field.
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