Torque Analysis of Concentric Magnetic Gear With Interconnected Flux Modulators

Zhan, Yang; Ma, Libo; Wang, Kai; Zhao, Haisen; Xu, Guorui; Ding, Ning

doi:10.1109/tmag.2019.2909798

Cited by 12 publications

(7 citation statements)

References 7 publications

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“…The same method is used in determining the best ratio between the thickness of inner yoke, t i , and PMs, t pm . The total volume of PM used for the simulation of the MGs is 100 cm 3 , where the best ratio for the thickness of inner yoke, t i , is five times the thickness of PMs, t pm . This is because, when the ratio was increased above that value, the increment of torque also started to flatten, reducing the efficiency of the MG, as shown in Figure 4c.…”

Section: Relationship Between the Parameter Of Permanent Magnets And mentioning

confidence: 99%

“…The motivation lies with the impact of the magnetic gear technology with the capability to enter the industries sector. For example, a magnetic gear system with bigger torque capacity with reduced ripples through the flux modulator structure with linking bridges between them, which is known as modulating ring, is presented in References [3,4]. The triple permanent magnetic gear structure is introduced by Shan Peng [5], with improved magnetic energy density.…”

Section: Introductionmentioning

confidence: 99%

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Simplified Design of Magnetic Gear by Considering the Maximum Transmission Torque Line

et al. 2020

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Magnetic gears (MGs) technology is studied widely among research institutions, with several improvements being documented. This development attracts a high amount of attention due to the demand in the development of magnetic gears towards higher performance than the conventional mechanical counterpart. In general, the design is complicated and there is a lack in detailed references for designing an MG for specific transmission torque as required by its application. Trial-and-error approaches have been the norm in achieving the desired torque by referring the existing MGs for the desired value of torque. This paper presents a new simplified approach towards designing an MG for the required torque and size by referring through a Maximum Transmission Torque Line (MTTL) reference. Finite element method (FEM) is used in analyzing randomly designed magnetic gears with various parameters towards the desired values of the MTTL. The proposed approach of MTTL is a new approach to estimate the total volume of permanent magnets (PMs) required for the MG to achieve the desired transmission torque. The reference line is used to generate equation relating the specific parameters of MG to develop the simplified design of MG based on the estimated total volume of PMs. This simplified way details to 8.5% of error in targeting the desired transmission torque, a means and way for the first stage of the MG design approach to reduce the conventional approaches.

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Section: Relationship Between the Parameter Of Permanent Magnets And mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simplified Design of Magnetic Gear by Considering the Maximum Transmission Torque Line

et al. 2020

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“…All these losses result in demagnetisation, heating, changes in magnetic field distribution and output torque reduction, especially at high rotational speeds and high gear ratios. Reducing such losses is essential to enhance the efficiency of MGs (Zhan et al, 2020;Feshki Farahani, 2020;Lee et al, 2020). The presence of a ferrofluid solution between the rotational parts of an MG increases the dynamic friction force/torque, and at high rotational speeds, the output torque is reduced and the general efficiency decreases.…”

Section: Introductionmentioning

confidence: 99%

Modelling of low-speed magnetic gear with viscose ferrofluid

Mateev

Marinova

2022

COMPEL

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Purpose In this paper, a computational model of a coaxial magnetic gear (MG) design with viscose ferrofluid between rotors is proposed. Viscose ferrofluid is used to decrease the magnetic reluctance and therefore creates higher magnetic torque. However, viscose friction of ferrofluid is undesirable and must be minimised in this particular application. MG is supposed to operate under low rotational speeds, where the dynamic viscose friction is very low, and the effects of the viscose ferrofluid over the MG’s efficiency must be estimated. The paper aims to analyze the performance of MG with viscose ferrofluid and to estimate the MG efficiency by computational model using finite element method (FEM). Design/methodology/approach An MG design with viscose ferrofluid between the outer low-speed rotor and modulating steel segments was modelled as a coupled transient magnetic field problem and a kinematic model with viscous friction coefficients derived from a previously computed fluid dynamics model. Findings The proposed computational implementation is suitable for homogeneous magnetic fluid modelling in electromagnetic actuators and rotational machines. The results regarding power and torque transmission of MG were obtained by coupled finite element modelling. The efficiency of MG significantly decreased due to ferrofluid friction. Originality/value The described MG design with viscose ferrofluid is a novel device with new operational characteristics, and new results for the effects of viscose ferrofluid friction in the outer magnetic field over the MG efficiency are estimated.

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“…In general, the biggest issue of the magnetic gears is the torque density. Therefore, studies [17][18][19][20][21][22][23][24] proposed various structures in order to increase the torque.…”

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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Torque Analysis of Concentric Magnetic Gear With Interconnected Flux Modulators

Cited by 12 publications

References 7 publications

Simplified Design of Magnetic Gear by Considering the Maximum Transmission Torque Line

Simplified Design of Magnetic Gear by Considering the Maximum Transmission Torque Line

Modelling of low-speed magnetic gear with viscose ferrofluid

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

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