Comparison of Magnetic Gear Characteristics Using Different Permanent Magnet Materials

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

doi:10.1109/tasc.2020.2966180

Cited by 17 publications

(8 citation statements)

References 6 publications

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“…Considering the anomalous current loss in Equation ( 4) by Bertotti, it could be expressed in the modified Steinmetz equation, as shown in Equation (5).…”

Section: Coreloss Characteristic Equationmentioning

confidence: 99%

“…Therefore, in order to compensate for the problems of mechanical gears, using permanent magnets of Neodium (NdFeB) and Samarium Cobalt (Sm 2 Co 17 ), which are excellent in recent high magnetic energy and temperature characteristics, various studies propose non-contact magnetic gears that are capable of transmitting power. Magnetic gears, unlike mechanical gears, can minimize loss, noise, vibration, and dust, due to contactless operation using permanent magnets rather than teeth, and can be used semi-permanently by preventing damage to the gears through system overload slip [4,5]. In addition, since there is no physical contact, it has the advantage of not requiring regular maintenance.…”

Section: Introductionmentioning

confidence: 99%

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Core-Loss Analysis of Linear Magnetic Gears Using the Analytical Method

et al. 2021

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In this study, analysis of core-loss occurring in the magnetic flux modulation core of a linear magnetic gear and the core of each mover is presented, using an analytical method. Losses in electric machines were generally calculated and analyzed using the finite element method (FEM). However, in the case of core-loss, the exact loss value could not be calculated using FEM data. Therefore, we considered the harmonic component of the air-gap magnetic flux density waveform with the modified Steinmetz equation, and performed a more accurate core-loss analysis with magnetic behavior analysis. Thus, we performed a calculated core-loss characteristic comparison with the FEM and the modified Steinmetz equation.

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“…Considering the anomalous current loss in Equation ( 4) by Bertotti, it could be expressed in the modified Steinmetz equation, as shown in Equation (5).…”

Section: Coreloss Characteristic Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Core-Loss Analysis of Linear Magnetic Gears Using the Analytical Method

et al. 2021

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“…In [20]- [22] the influence of the rotor design on the starting properties of synchronous motors with permanent magnets was emphasized. Work is also carried out on modifying the machine geometry, for example: changing the number and shape of slots and stator teeth to reduce the cogging torque, negatively affecting the operation of the machine in various states [23]- [25].…”

Section: Introductionmentioning

confidence: 99%

A new approach to design line start permanent magnet synchronous motors

Swierczynski

Antal

Habrych

et al. 2023

IJECE

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<span lang="EN-US">The article describes a new approach to line start permanent magnet synchronous motors (LSPMSM) design process. This different, novel approach is based on the modification of mass-produced induction motors. The presented method facilitates and expedites the electrical motor design process. A field-circuit model of the motor has been created to expound the methodology of the process. Then, the machine's geometry was changed to apply permanent magnets. The problems and benefits associated with the use of permanent magnets were described. The created model was tested. The authors examined the operation of the LSPMSM motor in different states, such as starting, no-load, and blocked-rotor tests. Electromechanical characteristics have been plotted. The simulation results were compared with the parameters and characteristics of the induction motor. The conducted tests proved the correctness of the design process. The operational properties of the motor have been improved. Moreover, the validity of using LSPMSM motors instead of induction motors has also been demonstrated.</span>

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“…Q1. What is the maximal rotational speed of the low speed rotor where the drag torque overcomes the benefits of reduced magnetic reluctance over the transmitted torque (Park et al, 2020;Yu et al, 2020)?…”

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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Comparison of Magnetic Gear Characteristics Using Different Permanent Magnet Materials

Cited by 17 publications

References 6 publications

Core-Loss Analysis of Linear Magnetic Gears Using the Analytical Method

Core-Loss Analysis of Linear Magnetic Gears Using the Analytical Method

A new approach to design line start permanent magnet synchronous motors

Modelling of low-speed magnetic gear with viscose ferrofluid

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