Pub Date : 2015-06-01DOI: 10.1109/INTMAG.2015.7157207
Z. Pu, J. Ruan, Y. Zhang, Z. Du, Q. Xie
An experimental scale-down model of UHVDC converter transformer is designed and manufactured to study the wave process in the winding under impulse voltage. Nine outgoing lines are set up on the different winding coil of the scale-down model. The voltage waveforms of different outgoing lines are obtained by lightning impulse test. The simulation model of scale-down transformer is established to calculate the distributed parameter matrices by the finite element method. The equivalent circuit of transformer winding is proposed to calculate the node voltage waveforms and the potential gradient distribution. The comparative analysis of test and simulation results shows that the oscillating voltage occurs in the winding and the simulation results can reflect the wave process characteristics.
{"title":"Wave process in scale-down model of UHVDC converter transformer winding under the lightning impulse voltage","authors":"Z. Pu, J. Ruan, Y. Zhang, Z. Du, Q. Xie","doi":"10.1109/INTMAG.2015.7157207","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7157207","url":null,"abstract":"An experimental scale-down model of UHVDC converter transformer is designed and manufactured to study the wave process in the winding under impulse voltage. Nine outgoing lines are set up on the different winding coil of the scale-down model. The voltage waveforms of different outgoing lines are obtained by lightning impulse test. The simulation model of scale-down transformer is established to calculate the distributed parameter matrices by the finite element method. The equivalent circuit of transformer winding is proposed to calculate the node voltage waveforms and the potential gradient distribution. The comparative analysis of test and simulation results shows that the oscillating voltage occurs in the winding and the simulation results can reflect the wave process characteristics.","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126705814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-06-01DOI: 10.1109/INTMAG.2015.7156980
G. Lu, X. Miao, W. Cheng, X. Huang, L. Yang, L. Pan
A series of soft magnetic FeCoSiO films were fabricated on Si (100) substrates using Cu as underlayer by radio frequency magnetron sputtering. The influence of Cu underlayers on the dynamic magnetic properties of as-sputtered FeCoSiO thin films were studied in details.
{"title":"Influence of Cu underlayer on the high-frequency magnetic properties of FeCoSiO thin films","authors":"G. Lu, X. Miao, W. Cheng, X. Huang, L. Yang, L. Pan","doi":"10.1109/INTMAG.2015.7156980","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7156980","url":null,"abstract":"A series of soft magnetic FeCoSiO films were fabricated on Si (100) substrates using Cu as underlayer by radio frequency magnetron sputtering. The influence of Cu underlayers on the dynamic magnetic properties of as-sputtered FeCoSiO thin films were studied in details.","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"170 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134144650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-11DOI: 10.1109/INTMAG.2015.7157132
B. Shi, Z. Tang, F. Talke
To reduce flutter and windage loss, helium has recently been used in high performance disk drives [1]. Several authors have studied the effect of helium on the stability of the head/disk interface, indicating that helium is beneficial for reducing head/disk dynamics and for increasing the track density in hard disk drives [2-5]. This paper studies the dynamics of the head/disk interface in helium and helium/air mixture. The Reynolds equation is used to simulate the flying characteristics of the head/disk interface to shock loading. Rarefaction and Van der Waal's effects are considered. Real time numerical simulations and power spectrum analysis are performed to analyze the frequency characteristics as a function of disk speed, flying height, and impulsive force.
{"title":"Dynamic behavior of air bearing slider in air-helium gas mixtures","authors":"B. Shi, Z. Tang, F. Talke","doi":"10.1109/INTMAG.2015.7157132","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7157132","url":null,"abstract":"To reduce flutter and windage loss, helium has recently been used in high performance disk drives [1]. Several authors have studied the effect of helium on the stability of the head/disk interface, indicating that helium is beneficial for reducing head/disk dynamics and for increasing the track density in hard disk drives [2-5]. This paper studies the dynamics of the head/disk interface in helium and helium/air mixture. The Reynolds equation is used to simulate the flying characteristics of the head/disk interface to shock loading. Rarefaction and Van der Waal's effects are considered. Real time numerical simulations and power spectrum analysis are performed to analyze the frequency characteristics as a function of disk speed, flying height, and impulsive force.","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115589619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-11DOI: 10.1109/INTMAG.2015.7157384
D. Kim, J. So, K. Woo, Y. You
Nowadays, energy saving has been one of the important issues in home appliances. An electric rice cooker is especially one of major electrical energy consumption in home appliance of Asia. Because most consumer of the rice cooker are used to use a warmer function all day long. Therefore, a lot of efforts have been made to improve the energy efficiency of the rice cooker. Especially, induction heating (IH) technology has been applied to the rice cooker due to its advantages regarding efficiency, fast heating, safety, cleanness and accurate controlled heating. This paper presents the heating performance improvement of IH rice cooker with magnetic flux concentrator (MFC). A coupled thermal-electromagnetics 3D-FEA was carried out to model the MFC and predict the magnetic flux density and temperature of jar in the rice cooker.
{"title":"Heating performance improvement of an induction heating rice cooker with magnetic flux concentrator","authors":"D. Kim, J. So, K. Woo, Y. You","doi":"10.1109/INTMAG.2015.7157384","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7157384","url":null,"abstract":"Nowadays, energy saving has been one of the important issues in home appliances. An electric rice cooker is especially one of major electrical energy consumption in home appliance of Asia. Because most consumer of the rice cooker are used to use a warmer function all day long. Therefore, a lot of efforts have been made to improve the energy efficiency of the rice cooker. Especially, induction heating (IH) technology has been applied to the rice cooker due to its advantages regarding efficiency, fast heating, safety, cleanness and accurate controlled heating. This paper presents the heating performance improvement of IH rice cooker with magnetic flux concentrator (MFC). A coupled thermal-electromagnetics 3D-FEA was carried out to model the MFC and predict the magnetic flux density and temperature of jar in the rice cooker.","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"306 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115666650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-11DOI: 10.1109/INTMAG.2015.7156504
W. Wang
The magnetic random accessible memory (MRAM) is positioned as one of the potential candidates for future universal memory[1]. Although MRAM's endurance outperforms most of the competing technologies, MRAM has not demonstrated strong advantage on area density [2]. Furthermore, recent rapid progress on area density in competing technologies, such as, aggressive scaling on Phase Change Memory [3], multiple-level / multi-bit charge trapping flash memories [4], makes it more important to improve the MRAM array density.
{"title":"Transistor-less Spin Torque Transfer MRAM design","authors":"W. Wang","doi":"10.1109/INTMAG.2015.7156504","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7156504","url":null,"abstract":"The magnetic random accessible memory (MRAM) is positioned as one of the potential candidates for future universal memory[1]. Although MRAM's endurance outperforms most of the competing technologies, MRAM has not demonstrated strong advantage on area density [2]. Furthermore, recent rapid progress on area density in competing technologies, such as, aggressive scaling on Phase Change Memory [3], multiple-level / multi-bit charge trapping flash memories [4], makes it more important to improve the MRAM array density.","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123117646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-11DOI: 10.1109/INTMAG.2015.7157381
S. Ding, G. Cui, H. Wang, Y. Deng
With the volume of induction motor in ship domain for driving application's increasing, the thermal load needs such bigger than ever before that electric machines are experiencing higher temperature which can affect performance and life expectancy in small room. The efficiency cooling system[1] is essential to keep induction motor operating regularly. The Y2-250M-455kW fan-cooled induction motor is taken as an example, and the steady temperature field is calculated by the finite volume method[2]. On this basis, the characteristics of fluid are analyzed in detail, as well as the different parameters of fluid in different positions can be shown. Finally the results of fluid field and temperature field, which are to be verified, are reasonable according to the measured data.
{"title":"Fluid flow analysis of fan-cooled induction motor for driving application by means of computational fluid dynamics","authors":"S. Ding, G. Cui, H. Wang, Y. Deng","doi":"10.1109/INTMAG.2015.7157381","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7157381","url":null,"abstract":"With the volume of induction motor in ship domain for driving application's increasing, the thermal load needs such bigger than ever before that electric machines are experiencing higher temperature which can affect performance and life expectancy in small room. The efficiency cooling system[1] is essential to keep induction motor operating regularly. The Y2-250M-455kW fan-cooled induction motor is taken as an example, and the steady temperature field is calculated by the finite volume method[2]. On this basis, the characteristics of fluid are analyzed in detail, as well as the different parameters of fluid in different positions can be shown. Finally the results of fluid field and temperature field, which are to be verified, are reasonable according to the measured data.","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123072233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-11DOI: 10.1109/INTMAG.2015.7157629
H. Yang, M. Chshiev
Ferromagnetic electrodes possessing a perpendicular magnetic easy axis is a key towards realizing next generation high density non-volatile memory and logic chips with high thermal stability. To obtain perpendicular magnetic anisotropy (PMA), usually heavy metals which have large spin-orbit coupling are needed. But those metals have large magnetic damping constant which will enhance the critical switching current. To overcome the issue, we propose a heavy-metal-free system, Co/ Graphene. Graphene has demonstrated outstanding physical properties such as exceptional electrical, thermal and mechanical properties, as well as its very long spin diffusion length up to room temperature. Especially, considering its perfect spin filtering [1-2], Co/Graphene can be very promising for the STT-MRAM application if large PMA can be realized.
{"title":"Co-Graphene heterostructures with giant perpendicular magnetocrystalline anisotropy","authors":"H. Yang, M. Chshiev","doi":"10.1109/INTMAG.2015.7157629","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7157629","url":null,"abstract":"Ferromagnetic electrodes possessing a perpendicular magnetic easy axis is a key towards realizing next generation high density non-volatile memory and logic chips with high thermal stability. To obtain perpendicular magnetic anisotropy (PMA), usually heavy metals which have large spin-orbit coupling are needed. But those metals have large magnetic damping constant which will enhance the critical switching current. To overcome the issue, we propose a heavy-metal-free system, Co/ Graphene. Graphene has demonstrated outstanding physical properties such as exceptional electrical, thermal and mechanical properties, as well as its very long spin diffusion length up to room temperature. Especially, considering its perfect spin filtering [1-2], Co/Graphene can be very promising for the STT-MRAM application if large PMA can be realized.","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"184 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123080544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-11DOI: 10.1109/INTMAG.2015.7157318
D. Handoko, S. Yu, S. Oh, D. Kim, D. Yang, S. Demyanov, N. Kalanda, A. Petrov, M. Yarmolich
Among the group of materials with the double perovskite structure, a half-metallic Sr2FeMoO6 (SFMO) system has attracted increasing attention. Recently, numerous studies have been carried out to understand the structural, magnetic, and magnetocaloric properties of SFMO [1-3] since the SFMO materials have TC about the room temperature, high low-field magnetic resistance (MR), and magnetocaloric effect. With these achievable properties, SFMO with double perovskite structure has become one of promising materials for spintronic applications such as spin-valve device, novel magnetic recording media, and spin-polarized current source material [4,5].
{"title":"Effect of annealing to oxidation state of Sr2FeMoO6 films with double perovskite structure","authors":"D. Handoko, S. Yu, S. Oh, D. Kim, D. Yang, S. Demyanov, N. Kalanda, A. Petrov, M. Yarmolich","doi":"10.1109/INTMAG.2015.7157318","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7157318","url":null,"abstract":"Among the group of materials with the double perovskite structure, a half-metallic Sr2FeMoO6 (SFMO) system has attracted increasing attention. Recently, numerous studies have been carried out to understand the structural, magnetic, and magnetocaloric properties of SFMO [1-3] since the SFMO materials have TC about the room temperature, high low-field magnetic resistance (MR), and magnetocaloric effect. With these achievable properties, SFMO with double perovskite structure has become one of promising materials for spintronic applications such as spin-valve device, novel magnetic recording media, and spin-polarized current source material [4,5].","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124286258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-11DOI: 10.1109/INTMAG.2015.7156684
G. Choe, A. Goncharov, F. Chu, P. Vanderheijden
Adjacent or far track erasure (ATE or FTE) in PMR recording can limit the recording track density. In a typical PMR head design, a shield is added near to the write pole to increase the write field gradient. The shield, however, leads to an additional flux path during writing, resulting in the erasure of neighboring tracks and bit error rate (BER) degradation. The media soft underlayer (SUL) is a part of the flux return path and its magnetic properties can also affect the ATE performance [1]. In this study, we report on systematic experimental and modelling results of ATE and FTE behavior of a PMR head with a wrapped-around shield (WAS) as a function of the SUL permeability and thickness.
{"title":"Adjacent and far track erasure dependence on media SUL permeability in shielded PMR head recording","authors":"G. Choe, A. Goncharov, F. Chu, P. Vanderheijden","doi":"10.1109/INTMAG.2015.7156684","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7156684","url":null,"abstract":"Adjacent or far track erasure (ATE or FTE) in PMR recording can limit the recording track density. In a typical PMR head design, a shield is added near to the write pole to increase the write field gradient. The shield, however, leads to an additional flux path during writing, resulting in the erasure of neighboring tracks and bit error rate (BER) degradation. The media soft underlayer (SUL) is a part of the flux return path and its magnetic properties can also affect the ATE performance [1]. In this study, we report on systematic experimental and modelling results of ATE and FTE behavior of a PMR head with a wrapped-around shield (WAS) as a function of the SUL permeability and thickness.","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116713862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-05-11DOI: 10.1109/INTMAG.2015.7157593
L. Li, J. Zhang, C. Zhang, H. Yan
This paper investigates the relationship between the electromagnetic parameters and the extreme input current in a permanent magnet synchronous motor (PMSM). It is found that the direct-axis inductance, DC resistance, and back-EMF for no load conditions have a large influence on the limit of the extreme input current. Hence, the lower back-EMF and smaller direct-axis inductance can help to improve the max output power of PMSM. Finite element analysis is performed for thermal modelling using the ANSYS Workbench and verified by test experiments.
{"title":"The research on electromagnetic and thermal issue of the high power density permanent magnet synchronous motor based on thermal conductivity optimization of the armature end","authors":"L. Li, J. Zhang, C. Zhang, H. Yan","doi":"10.1109/INTMAG.2015.7157593","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7157593","url":null,"abstract":"This paper investigates the relationship between the electromagnetic parameters and the extreme input current in a permanent magnet synchronous motor (PMSM). It is found that the direct-axis inductance, DC resistance, and back-EMF for no load conditions have a large influence on the limit of the extreme input current. Hence, the lower back-EMF and smaller direct-axis inductance can help to improve the max output power of PMSM. Finite element analysis is performed for thermal modelling using the ANSYS Workbench and verified by test experiments.","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"5 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120822627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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