Thermal Deformation of Thermally Assisted Magnetic Recording Head in Binary Gas Mixture at Various Temperatures

Park, Kyoung‐Su; Choi, Jihun; Park, Young−Pil; Park, No−Cheol

doi:10.1109/tmag.2013.2247985

Cited by 10 publications

(4 citation statements)

References 8 publications

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“…Besides structural improvements, increasing the armature density of the motor is the most effective way to increase the thrust density [1][2][3][4][5]. However, the temperature rise that is caused by the excessive electrical density is also an unacceptable problem in the precision field [6,7]. Therefore, water-cooled plates are installed on the armature surface to improve heat dissipation [8,9].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Suppression of the Eddy Current Damping Force of the Cooling Plate of a Permanent Magnet Linear Motor

Wang¹,

Sun²,

Kang³

et al. 2021

Symmetry

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This paper proposes a new symmetrical cooling plate. It can significantly reduce the eddy current damping force of the water-cooled metal plate. To increase the thrust density of coreless permanent magnet linear motors, cooling plates must be placed on the armature surface to reduce the temperature rise that is caused by high electrical density. However, when the motor moves at a high speed, extra damping force will be generated in the cooling plate, which affects the thrust quality and precision of the permanent magnet linear motor. In this study, we elaborate the mechanism of damping force generation in the cooling plate and propose a new symmetrical cooling plate with low damping force. This paper introduces the topology of a linear motor cooling system and presents an analytical model of the eddy current distribution of a water-cooled plate. The surface current equivalence method is used to calculate the magnitude of the damping force. A new, symmetrical water-cooled plate design method is proposed. This method uses the eddy current vector synthesis principle to cancel the eddy currents that are generated in each region, and to reduce the damping force that is generated in the cooling plate during motor motion. Finally, a 3D simulation model of the motor system is established and an experimental platform is built. The correctness of the analytical model and the effectiveness of the cooling plate design are verified using a simulation and an experiment.

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Section: Introductionmentioning

confidence: 99%

Analysis and Suppression of the Eddy Current Damping Force of the Cooling Plate of a Permanent Magnet Linear Motor

Wang¹,

Sun²,

Kang³

et al. 2021

Symmetry

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show abstract

“…In order to achieve these merits, PMLSMs are usually supplied with high current density, so excessive heat may generate in windings, which leads to a rapid and high temperature rise. The high temperature rise may cause insulation deterioration, structure deformation, permanent magnets demagnetization, and even a fatal failure of the machine (Park et al, 2013;Ruoho et al, 2010), which seriously limits the application of PMLSMs. Meantime, the demagnetization of permanent magnets will lead to a decrease of thrust force, and then the machine cannot meet the design requirement.…”

Section: Introductionmentioning

confidence: 99%

Thermal modeling and analysis of double-sided water-cooled permanent magnet linear synchronous machines

Chen

Yao

et al. 2016

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering

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Purpose – With the popularization of permanent magnet linear synchronous machines (PMLSMs) in recent years, the temperature rise has attracted increasingly attention since excessive heat generated in the windings could deteriorate the electromagnetic performance. In order to solve this problem, adopting water-cooled system is an effective method. The purpose of this paper is to investigate a 12-slot/11-pole (12S/11P) water-cooled double-sided PMLSM, which adopts the all teeth wound concentrated winding and shifted armature ends. Design/methodology/approach – Based on 2D finite element analysis (FEA), the thermal performances, such as temperature distribution, the optimization of water flow rate and the influence of demagnetization, are investigated under the condition of continuous duty. Then the maximum current density and average thrust force are calculated for PMLSMs with or without water-cooled system. Finally, the detailed comparison is made between single-sided PMLSM and double-sided PMLSM. Findings – With water-cooled system, the thermal performance of PMLSM can be improved, such as an efficient decrease of temperature rise, restriction of permanent magnet demagnetization and a dramatic increase of the maximum thrust force. It is found that the water flow rate has a significant impact on temperature rise, which can be optimized according to demands. Originality/value – Electromagnetic and thermal coupled analysis is proposed in this paper. It can approximately predict thermal performance and save the manual iteration time at the same time. This method also can provide as a reference of thermal analysis for other PMLSMs.

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“…The produced massive power losses lead to a quick and significant temperature rise, which can cause the damage of the insulation, the deformation of the structure, the demagnetization of permanent magnet etc. [1], [2]. If left untreated, the consequent hotspots may build up and propagate through windings and back irons, and then result in a catastrophic burnout or machine failure.…”

Section: Introductionmentioning

confidence: 99%

Thermal characteristics study of a water-cooled permanent magnet linear motor

Zhang

et al. 2014

2014 Ninth International Conference on Ecological Vehicles and Renewable Energies (EVER)

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For permanent magnet linear motors (PMLMs), large temperature rise can damage their performance and limit their output. Water-cooling system can be designed to reduce temperature rise and to improve thrust density. In order to study the thermal performance of a water-cooled, 14-pole, 12-slot PMLM, the finite element model and the thermal network model are erected. For water-cooled type PMLM, the modeling difficulties are solved. Under continuous duty, the temperature distribution of this PMLM is investigated based on the two models, which is validated by experimental results. The effect of water-cooling system and the impact of its parameters on temperature rise are investigated. And, the influence of temperature rise on motor thrust force, and efficiency is studied. Finally, based on the finite element model, thermal characteristics of this PMLM under shorttime duty and intermittent duty are studied, which find the relationship of running time and the maximum allowed short-time current, and the impact of load sustained rate.

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Thermal Deformation of Thermally Assisted Magnetic Recording Head in Binary Gas Mixture at Various Temperatures

Cited by 10 publications

References 8 publications

Analysis and Suppression of the Eddy Current Damping Force of the Cooling Plate of a Permanent Magnet Linear Motor

Analysis and Suppression of the Eddy Current Damping Force of the Cooling Plate of a Permanent Magnet Linear Motor

Thermal modeling and analysis of double-sided water-cooled permanent magnet linear synchronous machines

Thermal characteristics study of a water-cooled permanent magnet linear motor

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