Pub Date : 2015-05-11DOI: 10.1109/INTMAG.2015.7157804
L. Zhang, B. Kou, F. Xing, Y. Jin
A novel synchronous permanent magnet planar motor (SPMPM) which with concentric structure winding is investigated in this paper. Topology of this SPMPM is introduced, and as the mover can move freely on the stator, the planar motor is suitable for long-stroke applications in the lithography. Flux density, electromagnetic thrust and back-EMF of the SPMPM are obtained analytically and compared with the finite element simulation results. A prototype is manufactured and tested successfully. The measured values matching the simulated ones well.
{"title":"Research on a novel synchronous permanent magnet planar motor with concentric winding for lithography","authors":"L. Zhang, B. Kou, F. Xing, Y. Jin","doi":"10.1109/INTMAG.2015.7157804","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7157804","url":null,"abstract":"A novel synchronous permanent magnet planar motor (SPMPM) which with concentric structure winding is investigated in this paper. Topology of this SPMPM is introduced, and as the mover can move freely on the stator, the planar motor is suitable for long-stroke applications in the lithography. Flux density, electromagnetic thrust and back-EMF of the SPMPM are obtained analytically and compared with the finite element simulation results. A prototype is manufactured and tested successfully. The measured values matching the simulated ones well.","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"39 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":"122600519","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.2015.7157502
H. Teoh, S. Goolaup, C. Engel, W. Lew
In recent years, magnetic tunnel junctions (MTJs) have attracted great interests in the development of next generation high density non-volatile memory and logic chips. Though several MTJ-based logic structures have been proposed and demonstrated, these designs necessitate the inclusion of other electronic components to read the spintronic data as an electronic signal. Additionally, different levels of operations are required to achieve the desired logical function. In this work, we present a novel scheme for logic operation that is able to perform logical operations in two steps and requires no intermediate circuitry to sense the spintronic data. The device works by exploiting the magnetization dynamics of a spatial dependent distribution of current density of a magnetic tunnel junction free layer.
{"title":"Non-uniform spatial distribution of spin polarized current in perpendicular magnetic tunnel junction free layer for logic operation","authors":"H. Teoh, S. Goolaup, C. Engel, W. Lew","doi":"10.1109/INTMAG.2015.7157502","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7157502","url":null,"abstract":"In recent years, magnetic tunnel junctions (MTJs) have attracted great interests in the development of next generation high density non-volatile memory and logic chips. Though several MTJ-based logic structures have been proposed and demonstrated, these designs necessitate the inclusion of other electronic components to read the spintronic data as an electronic signal. Additionally, different levels of operations are required to achieve the desired logical function. In this work, we present a novel scheme for logic operation that is able to perform logical operations in two steps and requires no intermediate circuitry to sense the spintronic data. The device works by exploiting the magnetization dynamics of a spatial dependent distribution of current density of a magnetic tunnel junction free layer.","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"30 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114131684","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.2015.7157219
H. Zhu, J. Ju
The bias flux density in axial and radial air gaps of the three-pole radial-axial HMB is usually selected as a same value and the bias flux density is usually half of the saturation flux density. As a result the radial carrying capacity is proportional to the axial carrying capacity. But in most conditions, the axial and radial carrying capacity is required to be independent with each other. The carrying capacity in one of radial or axial direction will be larger than the required carrying capacity, which will lead to larger volume, heavier weight and higher power loss. In this paper, the three-pole radial-axial HMB is designed based on different bias and saturation flux density in radial and axial air gaps. In this case, the radial and axial carrying capacity can be designed independently and the volume and weight of the three-pole radial-axial HMB can be reduced.
{"title":"Design and optimisation of three-pole radial-axial HMB with independent radial and axial carrying capacity","authors":"H. Zhu, J. Ju","doi":"10.1109/INTMAG.2015.7157219","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7157219","url":null,"abstract":"The bias flux density in axial and radial air gaps of the three-pole radial-axial HMB is usually selected as a same value and the bias flux density is usually half of the saturation flux density. As a result the radial carrying capacity is proportional to the axial carrying capacity. But in most conditions, the axial and radial carrying capacity is required to be independent with each other. The carrying capacity in one of radial or axial direction will be larger than the required carrying capacity, which will lead to larger volume, heavier weight and higher power loss. In this paper, the three-pole radial-axial HMB is designed based on different bias and saturation flux density in radial and axial air gaps. In this case, the radial and axial carrying capacity can be designed independently and the volume and weight of the three-pole radial-axial HMB can be reduced.","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"44 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":"114373323","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.2015.7157805
H. Zhang, X. Zhang, C. Gerada, J. Li
Currently, there is significant attention being paid to the development of high-speed machines including motors and generators. In particular, permanent magnet machines are gaining more traction due to their outstanding efficiency, high power density, small size, low weight, simple mechanical construction, easy maintenance and good reliability. The higher the motor speed, the smaller the electric machine volume for the same power output. However, the heat or loss density of the machine is proportional to its power density, and the structure design aiming to better the loss distributing becomes a practical challenge for high speed machines. To ensure that the magnets or rotor bars can be retained safely, often a metal is designed on rotor outer surface, and large eddy loss would be generated while machine operating with a very high frequency electromagnetic field. In this case, scholars make efforts to minimize eddy current losses whilst providing mechanical integrity, which may benefit both the machine efficiency and thermal management. In this paper, a 3kW, 80k rpm high speed permanent magnetic generator is investigated, and its stator tooth top shape is optimized to reduce eddy losses in the rotor sleeve. During the process some other output performance parameters are considered by the proposed optimization mathematical model.
{"title":"Optimization on the tooth top shape of a high speed permanent magnetic generator","authors":"H. Zhang, X. Zhang, C. Gerada, J. Li","doi":"10.1109/INTMAG.2015.7157805","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7157805","url":null,"abstract":"Currently, there is significant attention being paid to the development of high-speed machines including motors and generators. In particular, permanent magnet machines are gaining more traction due to their outstanding efficiency, high power density, small size, low weight, simple mechanical construction, easy maintenance and good reliability. The higher the motor speed, the smaller the electric machine volume for the same power output. However, the heat or loss density of the machine is proportional to its power density, and the structure design aiming to better the loss distributing becomes a practical challenge for high speed machines. To ensure that the magnets or rotor bars can be retained safely, often a metal is designed on rotor outer surface, and large eddy loss would be generated while machine operating with a very high frequency electromagnetic field. In this case, scholars make efforts to minimize eddy current losses whilst providing mechanical integrity, which may benefit both the machine efficiency and thermal management. In this paper, a 3kW, 80k rpm high speed permanent magnetic generator is investigated, and its stator tooth top shape is optimized to reduce eddy losses in the rotor sleeve. During the process some other output performance parameters are considered by the proposed optimization mathematical model.","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"11 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":"114443313","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.2015.7157508
J. Kanak, J. Wrona, M. Banasik, A. Żywczak, W. Powroźnik, M. Czapkiewicz, T. Stobiecki
This study discusses the influence of Ta buffer layer thickness on magnetic and structural parameters of a Ta-Co40Fe40B20-MgO-Ta magnetic tunnel junction (MTJ). The MTJ is deposited on thermally oxidized Si(001) substrates and annealed at 330°C for 20 min. Atomic force microscopy and X-ray diffraction are used to investigate the microstructure and surface roughness while vibrating sample magnetometry is employed to determine the magnetic moment, perpendicular magnetic anisotropy, and coercivity.
{"title":"Influence of Ta buffer layer thickness on magnetic properties and microstructure parameters of CoFeB and MgO layers","authors":"J. Kanak, J. Wrona, M. Banasik, A. Żywczak, W. Powroźnik, M. Czapkiewicz, T. Stobiecki","doi":"10.1109/INTMAG.2015.7157508","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7157508","url":null,"abstract":"This study discusses the influence of Ta buffer layer thickness on magnetic and structural parameters of a Ta-Co40Fe40B20-MgO-Ta magnetic tunnel junction (MTJ). The MTJ is deposited on thermally oxidized Si(001) substrates and annealed at 330°C for 20 min. Atomic force microscopy and X-ray diffraction are used to investigate the microstructure and surface roughness while vibrating sample magnetometry is employed to determine the magnetic moment, perpendicular magnetic anisotropy, and coercivity.","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"84 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":"121866855","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.2015.7157203
Y. Xu, Q. Yuan, J. Zou, J. Li
This paper introduces periodic carrier frequency modulation (PCFM) to permanent magnet synchronous motor (PMSM) drive system to improve the electromagnetic compatibility. PCFM is introduced to reduce low frequency CM conducted EMI of PMSM drive system. Simulations and experimental results verify that sinusoidal and sawtooth PCFM can reduce CM conducted EMI of PMSM drive system effectively. Furthermore, sawtooth PCFM is more effective than sinusoidal PCFM in suppressing CM conducted EMI of PMSM drive system. Moreover, the reduction about CM conducted EMI of PMSM drive system by sinusoidal and sawtooth PCFM improves with the increase of spreading frequency widths.
{"title":"Influence of periodic carrier frequency modulation on low frequency electromagnetic interference of permanent magnet synchronous motor drive system","authors":"Y. Xu, Q. Yuan, J. Zou, J. Li","doi":"10.1109/INTMAG.2015.7157203","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7157203","url":null,"abstract":"This paper introduces periodic carrier frequency modulation (PCFM) to permanent magnet synchronous motor (PMSM) drive system to improve the electromagnetic compatibility. PCFM is introduced to reduce low frequency CM conducted EMI of PMSM drive system. Simulations and experimental results verify that sinusoidal and sawtooth PCFM can reduce CM conducted EMI of PMSM drive system effectively. Furthermore, sawtooth PCFM is more effective than sinusoidal PCFM in suppressing CM conducted EMI of PMSM drive system. Moreover, the reduction about CM conducted EMI of PMSM drive system by sinusoidal and sawtooth PCFM improves with the increase of spreading frequency widths.","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"21 2 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":"121898668","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.2015.7156693
Z. Zhang, Y. Mu, Y. Liu
This paper investigates the armature reaction field and inductance feature of the hybrid excitation synchronous machine (HESM) with magnetic shunting rotor and brushless field excitation. It is shown that introduction of excitation winding has a significant effect on armature reaction of the HESM. Inductance feature is determined by the saturation of both axial and radial flux path which vary with field current and armature current. A 24kW prototype is developed, and the 3D finite element analysis (FEA) results in accordance with measured results validate the inductance variation of the new HESM.
{"title":"Armature reaction field and inductance feature of hybrid excitation synchronous machine with magnetic shunting rotor","authors":"Z. Zhang, Y. Mu, Y. Liu","doi":"10.1109/INTMAG.2015.7156693","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7156693","url":null,"abstract":"This paper investigates the armature reaction field and inductance feature of the hybrid excitation synchronous machine (HESM) with magnetic shunting rotor and brushless field excitation. It is shown that introduction of excitation winding has a significant effect on armature reaction of the HESM. Inductance feature is determined by the saturation of both axial and radial flux path which vary with field current and armature current. A 24kW prototype is developed, and the 3D finite element analysis (FEA) results in accordance with measured results validate the inductance variation of the new HESM.","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"94 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":"116806101","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.2015.7157145
M. Elyasi, C. S. Bhatia, H. Yang
The large arrays of magnetic dots are the basis of magnonic crystals and bit patterned media. Resonance behaviors of densely packed magnetic arrays have been a subject of recent intensified research for their applications in microwave technology or signal transfer. Structural or magnetization non-uniformities in magnonic crystals lead to the appearance of defect modes, resulting in the modification of the magnon band-structure. It has been demonstrated experimentally that the state of a vortex matrix, is selectively formed under different frequencies of microwave excitation.
{"title":"Collective mode excitation assist for magnetization reversal","authors":"M. Elyasi, C. S. Bhatia, H. Yang","doi":"10.1109/INTMAG.2015.7157145","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7157145","url":null,"abstract":"The large arrays of magnetic dots are the basis of magnonic crystals and bit patterned media. Resonance behaviors of densely packed magnetic arrays have been a subject of recent intensified research for their applications in microwave technology or signal transfer. Structural or magnetization non-uniformities in magnonic crystals lead to the appearance of defect modes, resulting in the modification of the magnon band-structure. It has been demonstrated experimentally that the state of a vortex matrix, is selectively formed under different frequencies of microwave excitation.","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":"116840711","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.2015.7157136
P. Chung, M. Jhon
This study investigates the molecular conformations and dynamic responses of star-like PFPEs including TA-30 and QA-40. The coarse-grained molecular level description is used based on the force field estimation from the atomistic level model. The dynamic responses are determined by calculating the self-diffusion coefficient. It is found that star-like polymer structure and additional functional groups cause entanglement decreasing mobility drastically while increasing the film stability on the carbon overcoat.
{"title":"Film conformation and dynamic properties of atomistically architectured perfluoropolyethers on the carbon overcoated surface","authors":"P. Chung, M. Jhon","doi":"10.1109/INTMAG.2015.7157136","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7157136","url":null,"abstract":"This study investigates the molecular conformations and dynamic responses of star-like PFPEs including TA-30 and QA-40. The coarse-grained molecular level description is used based on the force field estimation from the atomistic level model. The dynamic responses are determined by calculating the self-diffusion coefficient. It is found that star-like polymer structure and additional functional groups cause entanglement decreasing mobility drastically while increasing the film stability on the carbon overcoat.","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"18 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":"117034268","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.2015.7156607
F. Xiao, Y. Du, W. Hua, M. Cheng, Y. Sun, H. Zhu, T. Ching
Stator permanent magnet (PM) motors, namely, flux-switching PM (FSPM) motor, double salient PM (DSPM) motor and flux reversal PM (FRPM) motor, have attracted more and more attentions for a lot of fields. In despite of the different PMs location, the three kinds of stator PM motors share several features in the structure, such as both of the PMs and armature windings are housed in the stator, the rotor is designed to be a simple iron core with salient teeth and the concentrated non-overlapping armature windings are usually adopted. However, this kind of motor suffers from the design limitation and the further power density improvement due to the concentrated non-overlapping armature windings structures.
{"title":"Winding configuration design of flux-switching PM motors based on magnetic gearing principle","authors":"F. Xiao, Y. Du, W. Hua, M. Cheng, Y. Sun, H. Zhu, T. Ching","doi":"10.1109/INTMAG.2015.7156607","DOIUrl":"https://doi.org/10.1109/INTMAG.2015.7156607","url":null,"abstract":"Stator permanent magnet (PM) motors, namely, flux-switching PM (FSPM) motor, double salient PM (DSPM) motor and flux reversal PM (FRPM) motor, have attracted more and more attentions for a lot of fields. In despite of the different PMs location, the three kinds of stator PM motors share several features in the structure, such as both of the PMs and armature windings are housed in the stator, the rotor is designed to be a simple iron core with salient teeth and the concentrated non-overlapping armature windings are usually adopted. However, this kind of motor suffers from the design limitation and the further power density improvement due to the concentrated non-overlapping armature windings structures.","PeriodicalId":381832,"journal":{"name":"2015 IEEE Magnetics Conference (INTERMAG)","volume":"32 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":"128541667","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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