Designing a Halbach Rotor Magnetic Gear for a Marine Hydrokinetic Generator

Baninajar, Hossein; Modaresahmadi, Sina; Wong, Ho Yin; Bird, Jonathan Z.; Dechant, Bertrand

doi:10.1109/tia.2022.3180705

Cited by 10 publications

(3 citation statements)

References 43 publications

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“…Magnetic gear has the characteristics of low noise, no lubrication, no maintenance, inherent overload protection, and so on [1][2][3]. It has a wide range of applications in wind turbines, electric vehicles and other fields [4,5]. Compared with the concentric harmonic magnetic gear (CHMG), the eccentric harmonic magnetic gear (EHMG) can achieve high torque density and high transmission ratio [6].…”

Section: Introductionmentioning

confidence: 99%

Analytical Model of Air‐Gap Magnetic Field for Eccentric Harmonic Magnetic Gear with Halbach Array

Liu,

Zhang

et al. 2023

IEEJ Transactions Elec Engng

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The eccentric harmonic magnetic gear (EHMG) has the characteristics of high torque density, high transmission ratio and high efficiency. The EHMG with Halbach array has better performance than the EHMG with traditional radial magnetization. Accurate calculation of its air‐gap magnetic field is of great significance for design and optimization. Based on the boundary perturbation method, a 2D analytical model of the air‐gap magnetic field of EHMG with Halbach array is established in this paper. The eccentric air‐gap magnetic field is calculated due to the permanent magnets of the eccentric rotor and the stator acting alone, and then the air‐gap magnetic field of the EHMG is obtained according to the superposition principle. The results of the air‐gap magnetic field are compared and evaluated by the regression evaluation indexes. The analytical results are consistent with the finite element results, which verifies the validity and accuracy of the analytical model. Comparing the EHMG with Halbach array and radial magnetization, the maximum static and dynamic electromagnetic torques of EHMG with Halbach array are increased by 59.1% and 55.6% compared with the EHMG with radial magnetization, which verifies the superior performance of EHMG with Halbach array. © 2023 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

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Section: Introductionmentioning

confidence: 99%

Analytical Model of Air‐Gap Magnetic Field for Eccentric Harmonic Magnetic Gear with Halbach Array

Liu,

Zhang

et al. 2023

IEEJ Transactions Elec Engng

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“…To further enhance the torque density and lower the torque ripple, a new structure of EHMG is proposed in this paper [19]. Inspired by [20], a fan-shaped structure is applied to the low-speed rotor, while the PMs on the stator are irregularly distributed in a 1:n:1 ratio. In addition, by rearranging and combining PMs, a Halbach array is used.…”

Section: Introductionmentioning

confidence: 99%

Characteristic Analysis of a New Structure Eccentric Harmonic Magnetic Gear

Jing

Wang

et al. 2023

Actuators

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An eccentric harmonic magnetic gear (EHMG) is better suited for situations requiring larger transmission ratios than magnetic-field-modulated magnetic gears. In the meantime, to increase the torque density even further, a new structure for EHMGs is presented in this paper. The stator’s permanent magnets (PMs) are irregularly distributed, while the rotor’s PMs are applied to a fan-shaped structure. Moreover, a Halbach array is adopted in both the rotor and the stator. A two-dimensional finite element (FE) model of the proposed EHMG is developed, and the flux density distribution and torque of the EHMG are calculated and verified via FE analysis. When compared to a conventional EHMG, the presented model’s torque increases from 38.04 Nm to 50.41 Nm. In addition, for the sake of avoiding the oscillation and noise caused by resonance, a modal analysis of the proposed model is conducted and the consequences show that it has better antivibration properties. Finally, a prototype is made, a test bench is established, and the correctness and effectiveness of the proposed model are verified.

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“…Despite these attractive features, it had very limited application due to its low torque capability since only a small portion of PMs were engaged in magnetic coupling. After Atallah introduced the concept of coaxial magnetic gears (CMGs) [16], [17], which significantly enhance the torque density, introducing the use of the coaxial structure and a pole-piece ring (i.e., modulation ring) that makes all PMs engaging in the magnetic coupling, numerous research groups have conducted in-depth investigations into their practical applications, including wind turbine generator [18], electric vehicle [19], [20], marine applications [21], [22], robotic applications [15], [23], [24].…”

mentioning

confidence: 99%

Coaxial Magnetic Gear-Based Tool-Changing System

Song,

Hur,

Jeong

2024

IEEE Access

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This paper presents a novel tool-changing mechanism that leverages a coaxial magnetic gear (CMG) with non-contact torque control capability. The non-contact power transmission feature of the magnetic gear provides not only sensorless torque control for rotational motion but also easy attachment/detachment without requiring additional actuation. Moreover, the isolation of the powertrain makes it resilient to external impacts. To facilitate tool replacement, we have introduced a docking station equipped with gas springs and an additional degree of freedom. This enables robust tool plate interchangeability without concerns about disturbances during the attachment process. We also established an integrated control structure by building upon our prior research, and the prototype of the proposed mechanism was validated through experimentation using a 6-degree of freedom (DoF) robotic manipulator.INDEX TERMS Mechanism design, factory automation, actuation and joint mechanisms.

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Designing a Halbach Rotor Magnetic Gear for a Marine Hydrokinetic Generator

Cited by 10 publications

References 43 publications

Analytical Model of Air‐Gap Magnetic Field for Eccentric Harmonic Magnetic Gear with Halbach Array

Analytical Model of Air‐Gap Magnetic Field for Eccentric Harmonic Magnetic Gear with Halbach Array

Characteristic Analysis of a New Structure Eccentric Harmonic Magnetic Gear

Coaxial Magnetic Gear-Based Tool-Changing System

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