Pub Date : 2023-06-30DOI: 10.4283/jmag.2023.28.2.135
Shicong Li, Decai Li, Shuangxi Li
This manuscript delves into the impact of shaft eccentricity and diameter on the pressure resistance and magnetic force of a magnetic fluid seal (MFS), through both magnetic circuit analysis method (MCAM) and finite element method (FEM). The study proposes a systematic approach to enhance the performance of eccentric MFS based on MCAM. The results show a near-linear decrease in the pressure resistance of the MFS with increasing eccentricity, with a maximum decline of 65 %. However, the MFS model with a 100 mm shaft diameter renders more precise results in predicting the sealing performance for larger shaft diameters since the pressure resistance decrease remains below 5 % as shaft diameter is increased. The optimal range of pole tooth structure parameters has also been determined. Remarkably, the proposed method affords a precise analysis of the performance of large-diameter eccentric MFS, which is not feasible using two-dimensional axisymmetric magnetic field models.
{"title":"The Influence of Shaft Eccentricity on the Magnetic Fluid Sealing Performance","authors":"Shicong Li, Decai Li, Shuangxi Li","doi":"10.4283/jmag.2023.28.2.135","DOIUrl":"https://doi.org/10.4283/jmag.2023.28.2.135","url":null,"abstract":"This manuscript delves into the impact of shaft eccentricity and diameter on the pressure resistance and magnetic force of a magnetic fluid seal (MFS), through both magnetic circuit analysis method (MCAM) and finite element method (FEM). The study proposes a systematic approach to enhance the performance of eccentric MFS based on MCAM. The results show a near-linear decrease in the pressure resistance of the MFS with increasing eccentricity, with a maximum decline of 65 %. However, the MFS model with a 100 mm shaft diameter renders more precise results in predicting the sealing performance for larger shaft diameters since the pressure resistance decrease remains below 5 % as shaft diameter is increased. The optimal range of pole tooth structure parameters has also been determined. Remarkably, the proposed method affords a precise analysis of the performance of large-diameter eccentric MFS, which is not feasible using two-dimensional axisymmetric magnetic field models.","PeriodicalId":16147,"journal":{"name":"Journal of Magnetics","volume":"20 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81711148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.4283/jmag.2023.28.2.151
M. Hessien, Mahdi Albogamy, M. Alsawat, A. Alhadhrami
{"title":"Impacts of Sr2+ and Annealing Temperature on the Composition, Structure, and Magnetic Properties of SrFe12O19 Synthesized by Tartrate Precursor Route","authors":"M. Hessien, Mahdi Albogamy, M. Alsawat, A. Alhadhrami","doi":"10.4283/jmag.2023.28.2.151","DOIUrl":"https://doi.org/10.4283/jmag.2023.28.2.151","url":null,"abstract":"","PeriodicalId":16147,"journal":{"name":"Journal of Magnetics","volume":"96 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75197667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.4283/jmag.2023.28.2.187
Shuguang Li, M. Waqas, Salma AlQahtani, M. Khan
Enhancing heat transfer is of utmost importance in modern industrial applications. Pure liquids for illustration ethylene glycol, propylene glycol and water having lower conductivity are commonly used as cooling liquids in distinct applications. This approach helps conserve and optimize the enhancement of heat transportation. However, in order to achieve enhanced thermal efficiency, state-of-the-art liquids known as nanoliquids have been recommended. Thus the Buongiorno two-component nanoliquid model, which exhibits superior thermal efficiency compared to the aforementioned standard cooling liquids is being considered for formulating and analyzing the behavior of Casson nanoliquid configured by cylindrical convected surface. The problem formulation incorporates various factors such as Darcy-Forchheimer porosity, thermophoresis, mag-netohydrodynamics, Brownian diffusion, suction/injection and Joule heating. Boundary-layer stretching flow is formulated. Dimensionless differential form from governing nonlinear problems is achieved by employing relevant variables. The application of the homotopy procedure results in convergent solutions for strongly nonlinear systems. The graphs are used to reveal the plots of significant factors in the analysis.
{"title":"Electro-magnetic Visco-plastic Nanofluid Flow Considering Buongiorno Two-component Model in Frames of Darcy-Forchheimer Porosity, Transpiration and Joule Heating","authors":"Shuguang Li, M. Waqas, Salma AlQahtani, M. Khan","doi":"10.4283/jmag.2023.28.2.187","DOIUrl":"https://doi.org/10.4283/jmag.2023.28.2.187","url":null,"abstract":"Enhancing heat transfer is of utmost importance in modern industrial applications. Pure liquids for illustration ethylene glycol, propylene glycol and water having lower conductivity are commonly used as cooling liquids in distinct applications. This approach helps conserve and optimize the enhancement of heat transportation. However, in order to achieve enhanced thermal efficiency, state-of-the-art liquids known as nanoliquids have been recommended. Thus the Buongiorno two-component nanoliquid model, which exhibits superior thermal efficiency compared to the aforementioned standard cooling liquids is being considered for formulating and analyzing the behavior of Casson nanoliquid configured by cylindrical convected surface. The problem formulation incorporates various factors such as Darcy-Forchheimer porosity, thermophoresis, mag-netohydrodynamics, Brownian diffusion, suction/injection and Joule heating. Boundary-layer stretching flow is formulated. Dimensionless differential form from governing nonlinear problems is achieved by employing relevant variables. The application of the homotopy procedure results in convergent solutions for strongly nonlinear systems. The graphs are used to reveal the plots of significant factors in the analysis.","PeriodicalId":16147,"journal":{"name":"Journal of Magnetics","volume":"91 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85846350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.4283/jmag.2023.28.2.172
Jinjie Ji, Xiangfan Wu, Tian Zuzhi
In magnetorheological devices, the magnetorheological fluids are inevitably in a zero-field state when the MR device is out of work. Long-term placement will lead to the sedimentation of MR fluids, reducing the performance of the magnetorheological device. A novel magnetorheological fluid was prepared by mixing microparticles and nanoparticles to solve this problem. After one-week placement, the sedimentation rate of the novel magnetorheological fluid is only 0.23 %, decreased by 88.5 % compared with general magnetorheological fluid. The novel magnetorheological fluid shows excellent sedimentation stability, keeping magnetorheological devices in good condition.
{"title":"Effect on the Sedimentation Stability of Magnetorheological Fluid by Micro-nano Composite System","authors":"Jinjie Ji, Xiangfan Wu, Tian Zuzhi","doi":"10.4283/jmag.2023.28.2.172","DOIUrl":"https://doi.org/10.4283/jmag.2023.28.2.172","url":null,"abstract":"In magnetorheological devices, the magnetorheological fluids are inevitably in a zero-field state when the MR device is out of work. Long-term placement will lead to the sedimentation of MR fluids, reducing the performance of the magnetorheological device. A novel magnetorheological fluid was prepared by mixing microparticles and nanoparticles to solve this problem. After one-week placement, the sedimentation rate of the novel magnetorheological fluid is only 0.23 %, decreased by 88.5 % compared with general magnetorheological fluid. The novel magnetorheological fluid shows excellent sedimentation stability, keeping magnetorheological devices in good condition.","PeriodicalId":16147,"journal":{"name":"Journal of Magnetics","volume":"10 11 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91017437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.4283/jmag.2023.28.2.124
Xiaolong Yang, Y. Li, Youming Zhou, Shiying Zhou, JieHong Zhu
Magnetorheological valves are important components in hydraulic systems that provide precise position con-trol. At present, the low-pressure drop performance of magnetorheological valves is the main problem limiting their application. To improve the pressure drop performance of magnetorheological valves, a hybrid magnetic source disc magnetorheological valve is proposed. The magnetic pressure drop model and viscous pressure drop model of the hybrid magnet source disc type magnetorheological valve based on the Bingham model are Derived. Magnetic field distributions in the damping channel of the hybrid magnet source disc type magnetor-heological valve are obtained by using ANSYS finite element analysis software. The mathematical model of the relationship between pressure drop and magnetic induction intensity was established using Matlab software, and the effects of parameters such as effective current, axial damping gap, radial damping gap, and coil width on the pressure drop performance of disc-type magnetorheological valves with hybrid magnetic sources were numerically analyzed. The results show that the pressure drop of the disc magnetorheological valve with a hybrid magnetic source can reach 10.9935 MPa at the current I=3A, axial damping gap ga=1 mm, and radial damping gap gr=1.5 mm. Compared with the conventional disc magnetorheological valve, the pressure drop performance of the hybrid magnetic source disc magnetorheological valve is improved by 28 %, which provides ideas on how to improve the pressure drop performance of the magnetorheological valve.
{"title":"Design and Numerical Study of Hybrid Magnetic Source Disc-type Magnetorheological Valve","authors":"Xiaolong Yang, Y. Li, Youming Zhou, Shiying Zhou, JieHong Zhu","doi":"10.4283/jmag.2023.28.2.124","DOIUrl":"https://doi.org/10.4283/jmag.2023.28.2.124","url":null,"abstract":"Magnetorheological valves are important components in hydraulic systems that provide precise position con-trol. At present, the low-pressure drop performance of magnetorheological valves is the main problem limiting their application. To improve the pressure drop performance of magnetorheological valves, a hybrid magnetic source disc magnetorheological valve is proposed. The magnetic pressure drop model and viscous pressure drop model of the hybrid magnet source disc type magnetorheological valve based on the Bingham model are Derived. Magnetic field distributions in the damping channel of the hybrid magnet source disc type magnetor-heological valve are obtained by using ANSYS finite element analysis software. The mathematical model of the relationship between pressure drop and magnetic induction intensity was established using Matlab software, and the effects of parameters such as effective current, axial damping gap, radial damping gap, and coil width on the pressure drop performance of disc-type magnetorheological valves with hybrid magnetic sources were numerically analyzed. The results show that the pressure drop of the disc magnetorheological valve with a hybrid magnetic source can reach 10.9935 MPa at the current I=3A, axial damping gap ga=1 mm, and radial damping gap gr=1.5 mm. Compared with the conventional disc magnetorheological valve, the pressure drop performance of the hybrid magnetic source disc magnetorheological valve is improved by 28 %, which provides ideas on how to improve the pressure drop performance of the magnetorheological valve.","PeriodicalId":16147,"journal":{"name":"Journal of Magnetics","volume":"41 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85136001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.4283/jmag.2023.28.2.208
Hyungyu Cha
{"title":"Effects of Repetitive Transcranial Magnetic Stimulation on Neuropathic Pain and Walking Ability in Patients with Incomplete Spinal Cord Injury","authors":"Hyungyu Cha","doi":"10.4283/jmag.2023.28.2.208","DOIUrl":"https://doi.org/10.4283/jmag.2023.28.2.208","url":null,"abstract":"","PeriodicalId":16147,"journal":{"name":"Journal of Magnetics","volume":"69 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86746988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.4283/jmag.2023.28.2.219
Gözüaçık Emre, Mustafa Eker, M. Akar
This study proposes a solution to improve the analysis time of the Axial Flux Synchronous Reluctance Motor (AF-SynRM) using the Finite Element Method (FEM) using the Finite Element Method (FEM). While accurate results can be achieved through 2D and 3D FEM analyses in the design of electrical machines, the analysis time becomes a significant consideration. The non-axisymmetric structure of the flux path in axial flux motors poses challenges for accurate results in 2D FEM analyses. To overcome this issue, the study uses simulation studies to convert axial flux motors into 2D linear models. In this study, a slice model approach is implemented in the linear structure, and the influence of the number of slices on various motor parameters, such as torque, torque ripple, back-EMF, loss, and efficiency, is analyzed and compared with 3D FEM analyses. Experimental loss and efficiency results are also included in these analyses. This study is the first to simulate an AF-SynRM in the 2D linear model. The accuracy of the results is verified experimentally.
{"title":"Multislice Analysis of Axial Flux Synchronous Reluctance Motor Based on 2d Finite Element Method Linear Model","authors":"Gözüaçık Emre, Mustafa Eker, M. Akar","doi":"10.4283/jmag.2023.28.2.219","DOIUrl":"https://doi.org/10.4283/jmag.2023.28.2.219","url":null,"abstract":"This study proposes a solution to improve the analysis time of the Axial Flux Synchronous Reluctance Motor (AF-SynRM) using the Finite Element Method (FEM) using the Finite Element Method (FEM). While accurate results can be achieved through 2D and 3D FEM analyses in the design of electrical machines, the analysis time becomes a significant consideration. The non-axisymmetric structure of the flux path in axial flux motors poses challenges for accurate results in 2D FEM analyses. To overcome this issue, the study uses simulation studies to convert axial flux motors into 2D linear models. In this study, a slice model approach is implemented in the linear structure, and the influence of the number of slices on various motor parameters, such as torque, torque ripple, back-EMF, loss, and efficiency, is analyzed and compared with 3D FEM analyses. Experimental loss and efficiency results are also included in these analyses. This study is the first to simulate an AF-SynRM in the 2D linear model. The accuracy of the results is verified experimentally.","PeriodicalId":16147,"journal":{"name":"Journal of Magnetics","volume":"39 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91165974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.4283/jmag.2023.28.2.213
J. Lee, Bo Woo Lee
{"title":"A Study on Aliasing Artifact Shielding Materials using Aluminum Material in Magnetic Resonance Imaging","authors":"J. Lee, Bo Woo Lee","doi":"10.4283/jmag.2023.28.2.213","DOIUrl":"https://doi.org/10.4283/jmag.2023.28.2.213","url":null,"abstract":"","PeriodicalId":16147,"journal":{"name":"Journal of Magnetics","volume":"49 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73307248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-30DOI: 10.4283/jmag.2023.28.2.102
Jungbae Kim, Yeon Jung Park, J. Dho
Epitaxial (001) NiCo 2 O 4 films with perpendicular magnetic anisotropy were grown on (001) MgAl 2 O 4 at various oxygen pressures of 10-200 mTorr using pulsed laser deposition. X-ray diffraction suggested that the lattice constant, crystallinity, and deposition rate displayed distinctive changes around 50 mTorr. The temperature-dependent resistance displayed an insulating behavior in the films grown below 15 mTorr but a metallic one in the films grown above 20 mTorr. Magneto-optical Kerr effect measurement suggested that the NiCo 2 O 4 films grown above 15 mTorr are ferrimagnetic at room temperature and possess a distinctive perpendicular magnetic anisotropy. The ferrimagnetic-to-paramagnetic transition temperature reached a maximum of ~385 K at 50 mTorr. During the magnetic reversal, the density of small nucleated domains increased with increasing oxygen pressure from 20 to 200 mTorr, and exhibited metallic ferrimagnetism at room temperature. Consequently, the optimal growth condition for magnetic device applications of NiCo 2 O 4 films is believed to be 50-200 mTorr at 320 ℃.
{"title":"Ferrimagnetic and Metallic Properties of (001) NiCo₂O₄ Films Fabricated at Various Oxygen Pressures","authors":"Jungbae Kim, Yeon Jung Park, J. Dho","doi":"10.4283/jmag.2023.28.2.102","DOIUrl":"https://doi.org/10.4283/jmag.2023.28.2.102","url":null,"abstract":"Epitaxial (001) NiCo 2 O 4 films with perpendicular magnetic anisotropy were grown on (001) MgAl 2 O 4 at various oxygen pressures of 10-200 mTorr using pulsed laser deposition. X-ray diffraction suggested that the lattice constant, crystallinity, and deposition rate displayed distinctive changes around 50 mTorr. The temperature-dependent resistance displayed an insulating behavior in the films grown below 15 mTorr but a metallic one in the films grown above 20 mTorr. Magneto-optical Kerr effect measurement suggested that the NiCo 2 O 4 films grown above 15 mTorr are ferrimagnetic at room temperature and possess a distinctive perpendicular magnetic anisotropy. The ferrimagnetic-to-paramagnetic transition temperature reached a maximum of ~385 K at 50 mTorr. During the magnetic reversal, the density of small nucleated domains increased with increasing oxygen pressure from 20 to 200 mTorr, and exhibited metallic ferrimagnetism at room temperature. Consequently, the optimal growth condition for magnetic device applications of NiCo 2 O 4 films is believed to be 50-200 mTorr at 320 ℃.","PeriodicalId":16147,"journal":{"name":"Journal of Magnetics","volume":"191 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79609988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-31DOI: 10.4283/jmag.2023.28.1.024
Tasawar Abbas, M. Saeed, Kaouther Ghachem, B. Alshammari, S. Khan, L. Kolsi
{"title":"Thermal Conductivity and Mixed Convection Influence on the Flow of Viscoelastic Fluid Due To Inclined Cylinder","authors":"Tasawar Abbas, M. Saeed, Kaouther Ghachem, B. Alshammari, S. Khan, L. Kolsi","doi":"10.4283/jmag.2023.28.1.024","DOIUrl":"https://doi.org/10.4283/jmag.2023.28.1.024","url":null,"abstract":"","PeriodicalId":16147,"journal":{"name":"Journal of Magnetics","volume":"32 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81515672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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