Pub Date : 2018-04-01DOI: 10.1109/INTMAG.2018.8508160
L. Cong, X. Li, L. Wu
{"title":"Comparison of Rotor Eddy Current Losses in Fractional-Slot Concentrated-Winding IPM machines with Different Rotor Topology","authors":"L. Cong, X. Li, L. Wu","doi":"10.1109/INTMAG.2018.8508160","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508160","url":null,"abstract":"","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"640 ","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91456787","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 : 2018-04-01DOI: 10.1109/INTMAG.2018.8508759
H. Li, J. Gao, S. Huang, P. Fan
The interior permanent magnet synchronous machine (IPMSM), which could generates reluctance torque in flux weakening region to enhance the motor performance and efficiency, is widely applied in electric vehicles (EV) [1, 2]. In order to dig out the maximum potential of the traction system of EV further, dynamic DC link voltage control strategies has been explored by several researchers [3, 4]. Generally speaking, keeping a low DC link voltage at low operating speed could reduce the switching losses of the inverter while boosting its value at high speed could benefit the flux weakening operation [5] However, the IPMSM parameters will become different with operating conditions, for example, the inductance and the magnetic characteristic will change with current due to the cross coupling and magnetic saturation effect (omitted to cross saturation effect) [6]. Therefore, the conventional control strategy of IPMSM ignoring the cross saturation effect needs to be revised.
{"title":"Dynamic DC link Voltage Control Strategy of Electric Vehicles Considering the Cross Saturation Effect.","authors":"H. Li, J. Gao, S. Huang, P. Fan","doi":"10.1109/INTMAG.2018.8508759","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508759","url":null,"abstract":"The interior permanent magnet synchronous machine (IPMSM), which could generates reluctance torque in flux weakening region to enhance the motor performance and efficiency, is widely applied in electric vehicles (EV) [1, 2]. In order to dig out the maximum potential of the traction system of EV further, dynamic DC link voltage control strategies has been explored by several researchers [3, 4]. Generally speaking, keeping a low DC link voltage at low operating speed could reduce the switching losses of the inverter while boosting its value at high speed could benefit the flux weakening operation [5] However, the IPMSM parameters will become different with operating conditions, for example, the inductance and the magnetic characteristic will change with current due to the cross coupling and magnetic saturation effect (omitted to cross saturation effect) [6]. Therefore, the conventional control strategy of IPMSM ignoring the cross saturation effect needs to be revised.","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"24 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90481713","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 : 2018-04-01DOI: 10.1109/INTMAG.2018.8508223
A. Chen, A. Nysveen, J. Lervik, M. Høyer-Hansen
In direct electrical heating system (DEHs), which is developed for subsea process to safeguard well stream through pipelines to topside process platform or shore, the production pipeline is also acts as an active conductor conducting large AC current to generate heat. The heating source is conductive and hysteresis power losses in the pipe. Currently, the all implemented DEHs operate at 50Hz. There is a potential to further improve the heating capacity of the DEHs by operating the system at higher frequency so that the same power can be achieved at lower current. Consequently, the cross-session of the power cable can be reduced. Furthermore, operation in higher frequency directly results in better system utilization and less AC corrosion of the pipeline. This will further reduce the installation and operational cost and increase the system lifetime. For DEHs design it is critical to predict the heating power as function of input current and frequency so that proper frequency and current can be selected correspondingly. This paper analytically evaluate the heating power as functions of current and frequency based on experimentally measured material properties such as mass density, conductivity, B-H curve and hysteresis B-H loop energy. To verify the analytical results, both FEM simulation and prototype test are performed.
{"title":"Prediction of Heating Power in Magnetic Pipe Conducting Large AC Current With High Frequencies Up to 200Hz.","authors":"A. Chen, A. Nysveen, J. Lervik, M. Høyer-Hansen","doi":"10.1109/INTMAG.2018.8508223","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508223","url":null,"abstract":"In direct electrical heating system (DEHs), which is developed for subsea process to safeguard well stream through pipelines to topside process platform or shore, the production pipeline is also acts as an active conductor conducting large AC current to generate heat. The heating source is conductive and hysteresis power losses in the pipe. Currently, the all implemented DEHs operate at 50Hz. There is a potential to further improve the heating capacity of the DEHs by operating the system at higher frequency so that the same power can be achieved at lower current. Consequently, the cross-session of the power cable can be reduced. Furthermore, operation in higher frequency directly results in better system utilization and less AC corrosion of the pipeline. This will further reduce the installation and operational cost and increase the system lifetime. For DEHs design it is critical to predict the heating power as function of input current and frequency so that proper frequency and current can be selected correspondingly. This paper analytically evaluate the heating power as functions of current and frequency based on experimentally measured material properties such as mass density, conductivity, B-H curve and hysteresis B-H loop energy. To verify the analytical results, both FEM simulation and prototype test are performed.","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"9 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90504367","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 : 2018-04-01DOI: 10.1109/INTMAG.2018.8508765
W. Hou, Z. Zhou, M. Liu
Abstract
摘要
{"title":"Voltage Control of Two-Magnon Scattering in MnZn Ferrite thin film.","authors":"W. Hou, Z. Zhou, M. Liu","doi":"10.1109/INTMAG.2018.8508765","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508765","url":null,"abstract":"Abstract","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"93 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83817921","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 : 2018-04-01DOI: 10.1109/INTMAG.2018.8508089
A. Kalish, R. Komarov, M. Kozhaev, V. Achanta, S. Dagesyan, A. Shaposhnikov, V. Berzhansky, A. Zvezdin, V. Belotelov
Resent research has demonstrated the enhancement of magneto-optical effects in structured media. In particular, the attention has been paid to plasmonic crystals which are periodic structures supporting surface plasmon polaritons. It was demonstrated that the transverse Kerr effect and the Faraday effect are resonantly enhanced in magnetoplasmonic crystals, and also novel promising effects arise, namely the longitudinal intensity effect [1–3]. As a rule, these effects are of resonant nature, due to their relation to the excitation of eigenmodes, which leads to narrow spectral range of magneto-optical response. In the present work, we propose and demonstrate an approach for forming a broadband magneto-optical response using one-dimensional magnetoplasmonic quasicrystals. Plasmonic quasicrystalline structures offer advances in their optical response over their periodic counterparts, such as broadband and polarization-independent optical transmittance [4]. The considered 1D magnetoplasmonic quasicrystalline structure is formed by a metallic quasicrystal grating on top of the smooth magnetic dielectric layer on a substrate. The sequence of metal stripes and air slits of the grating can be described by symbols ‘1’ and ‘0’. Our structure is based on the 1D binary Fibonacci sequence, where ‘0’ is substituted by ‘010’. The metal grating of the experimentally studied samples is made of 80-nm-thick gold layer. The air slit width corresponding to single ‘0’ in the binary sequence is 80 nm and the metal stripes width corresponding to single ‘1’ in sequence is 600 nm. The magnetic dielectric is bismuth substituted iron-garnet of composition Bi1.5Gd1.5Fe4.5Al0.5O12. The thickness of the magnetic film was made rather small, 80 nm, to exclude the waveguide modes excitation in the considered frequency range, so only surface plasmon polaritons (SPPs) can be excited. Spectrum of the SPPs excited by the incident light in a plasmonic grating structure is determined by the reciprocal lattice vectors which enter the phase matching condition. The numerical calculation of the Fourier transform of the quasicrystalline pattern reveals that the reciprocal lattice for the quasicrystal is discrete and it is far denser compared to the periodic-crystal’s one. In particular, it is non-equidistant. For example, the studied structure possesses reciprocal vectors equal to 15.39, 16.76 and 19.01 μm−1, while the corresponding periodic structure has only reciprocal vector of 18.48 μm−1 in this spectral range. The excitation of the SPPs in plasmonic structures with magnetic materials is accompanied by the resonant enhancement of the Transverse magneto-optical Kerr effect (TMOKE). Experimentally measured TMOKE spectrum for the magnetoplasmonic quasicrystal is shown in Fig. 1, together with calculated SPP dispersion curves. It is far richer than the one for the corresponding periodic structure. Apart from the first pair of resonances at around λ=820 nm (for small incidence angles) that i
{"title":"Broadband Magneto-Optical Response of Magnetoplasmonic Quasicrystals.","authors":"A. Kalish, R. Komarov, M. Kozhaev, V. Achanta, S. Dagesyan, A. Shaposhnikov, V. Berzhansky, A. Zvezdin, V. Belotelov","doi":"10.1109/INTMAG.2018.8508089","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508089","url":null,"abstract":"Resent research has demonstrated the enhancement of magneto-optical effects in structured media. In particular, the attention has been paid to plasmonic crystals which are periodic structures supporting surface plasmon polaritons. It was demonstrated that the transverse Kerr effect and the Faraday effect are resonantly enhanced in magnetoplasmonic crystals, and also novel promising effects arise, namely the longitudinal intensity effect [1–3]. As a rule, these effects are of resonant nature, due to their relation to the excitation of eigenmodes, which leads to narrow spectral range of magneto-optical response. In the present work, we propose and demonstrate an approach for forming a broadband magneto-optical response using one-dimensional magnetoplasmonic quasicrystals. Plasmonic quasicrystalline structures offer advances in their optical response over their periodic counterparts, such as broadband and polarization-independent optical transmittance [4]. The considered 1D magnetoplasmonic quasicrystalline structure is formed by a metallic quasicrystal grating on top of the smooth magnetic dielectric layer on a substrate. The sequence of metal stripes and air slits of the grating can be described by symbols ‘1’ and ‘0’. Our structure is based on the 1D binary Fibonacci sequence, where ‘0’ is substituted by ‘010’. The metal grating of the experimentally studied samples is made of 80-nm-thick gold layer. The air slit width corresponding to single ‘0’ in the binary sequence is 80 nm and the metal stripes width corresponding to single ‘1’ in sequence is 600 nm. The magnetic dielectric is bismuth substituted iron-garnet of composition Bi1.5Gd1.5Fe4.5Al0.5O12. The thickness of the magnetic film was made rather small, 80 nm, to exclude the waveguide modes excitation in the considered frequency range, so only surface plasmon polaritons (SPPs) can be excited. Spectrum of the SPPs excited by the incident light in a plasmonic grating structure is determined by the reciprocal lattice vectors which enter the phase matching condition. The numerical calculation of the Fourier transform of the quasicrystalline pattern reveals that the reciprocal lattice for the quasicrystal is discrete and it is far denser compared to the periodic-crystal’s one. In particular, it is non-equidistant. For example, the studied structure possesses reciprocal vectors equal to 15.39, 16.76 and 19.01 μm−1, while the corresponding periodic structure has only reciprocal vector of 18.48 μm−1 in this spectral range. The excitation of the SPPs in plasmonic structures with magnetic materials is accompanied by the resonant enhancement of the Transverse magneto-optical Kerr effect (TMOKE). Experimentally measured TMOKE spectrum for the magnetoplasmonic quasicrystal is shown in Fig. 1, together with calculated SPP dispersion curves. It is far richer than the one for the corresponding periodic structure. Apart from the first pair of resonances at around λ=820 nm (for small incidence angles) that i","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"71 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83278413","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 : 2018-04-01DOI: 10.1109/INTMAG.2018.8508573
B. Chen, J. Dong, C. Tian, Q. Chen
Dry-type iron-core inductors in urban high-voltage substation reactive power local balance and reasonable control of voltage fluctuations plays an important role [1]. As its number of applications and uptime increase, the amount of failure must also increase. The most common events of dry-coil devices are interturn faults, which can damage the insulation of the coil and even burn the device when a large current generated in the short-circuit loop. Right now, the low-voltage dry-type iron-core inductors lack a special inter-turn fault detection method and generally use overcurrent protection and temperature detection protection. The zero-sequence and negative-sequence power direction protection are mostly used for ultrahigh-voltage inductors protection [2]– [3]. Therefore, this paper proposes to use the difference of the distribution characteristics of space magnetic field in normal operation and inter-turn fault as the criterion of on-line detection algorithm for turn-to-turn fault [4]–[5]. In this paper, a field-circuit coupled finite element model of a three-phase iron-core inductor is established. The distribution characteristics of the spatial magnetic field under normal operating conditions and different inter-turn fault conditions are simulated and analyzed. This result provides a theoretical basis for the inductor on-line detection algorithm of non-contact turn-to-turn fault.
{"title":"Leakage Flux based Turn-To-Turn Fault Detection for Shunt Inductor","authors":"B. Chen, J. Dong, C. Tian, Q. Chen","doi":"10.1109/INTMAG.2018.8508573","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508573","url":null,"abstract":"Dry-type iron-core inductors in urban high-voltage substation reactive power local balance and reasonable control of voltage fluctuations plays an important role [1]. As its number of applications and uptime increase, the amount of failure must also increase. The most common events of dry-coil devices are interturn faults, which can damage the insulation of the coil and even burn the device when a large current generated in the short-circuit loop. Right now, the low-voltage dry-type iron-core inductors lack a special inter-turn fault detection method and generally use overcurrent protection and temperature detection protection. The zero-sequence and negative-sequence power direction protection are mostly used for ultrahigh-voltage inductors protection [2]– [3]. Therefore, this paper proposes to use the difference of the distribution characteristics of space magnetic field in normal operation and inter-turn fault as the criterion of on-line detection algorithm for turn-to-turn fault [4]–[5]. In this paper, a field-circuit coupled finite element model of a three-phase iron-core inductor is established. The distribution characteristics of the spatial magnetic field under normal operating conditions and different inter-turn fault conditions are simulated and analyzed. This result provides a theoretical basis for the inductor on-line detection algorithm of non-contact turn-to-turn fault.","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"16 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79555511","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 : 2018-04-01DOI: 10.1109/INTMAG.2018.8508504
L. Zhu, R. Sha, X. Zhang, B. Wang, T. Han
The reactor is an important power equipment in the transmission and transmission system, which plays many different roles in the power system. As a typical reactor structure, the split-core reactor can reduce the residual magnetism and effectively control the inductance. In recent years, it has developed rapidly and has been widely used. The vibration noise generated by the power equipment in operation not only affects its normal operation and service life, but also produces audible noise and other environmental problems [1]. How to reduce its vibration noise effectively has become an urgent problem for manufacturers and power departments. Accurate measurement of magnetization and magnetostrictive properties of silicon steel is the basis for the study of reactor noise and vibration. Lieven Vandevelde, a Belgian scholar, puts forward the method of calculating the deformation of an object due to maxwell and magnetostrictive force by means of finite element analysis [2]. GaoYanhui, Japan, Kazyhiro Muramatsu USES the relationship between the node displacement, the magnetostrictive stress of the node and the distance between the node and the center point to calculate the vibration displacement of the iron core of the reactor [3]. In the literature [4], the British scholar Annable Shahaj proposed using magnetic twin chips to control the magnetostriction on the stator teeth of the motor, and the magnetostrictive force components were offset by the magnetostrictive force. Manufacturers often compression core column and base structure, such as the increase of rubber vibration isolator between ontology and body and improve the air gap materials and other methods of reducing the electromagnetic vibration in the reactor from the vibration mechanism of reactor vibration noise research is less. Calculating the magnitude and distribution of electromagnetic vibrations is necessary for designing reactors with lower vibration noise. Based on the measurement results of the magnetization and magnetostrictive properties of orientation silicon steel and non-oriented silicon steel, the model of three-dimensional split-core reactor is established. Based on the inherent magnetostrictive properties of oriented and non-oriented silicon steel sheets, a new type of iron core with alternating core-column structure consisting of oriented silicon steel sheet and non-oriented silicon steel sheet was proposed. Numerical calculation of magnetic field, stress field and vibration displacement of reactor under ordinary structure and new structure, the results show that the method has a certain damping effect.
{"title":"Research on Split-Core Reactor Vibration Reduction Method Based on Magnetostrictive Effect.","authors":"L. Zhu, R. Sha, X. Zhang, B. Wang, T. Han","doi":"10.1109/INTMAG.2018.8508504","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508504","url":null,"abstract":"The reactor is an important power equipment in the transmission and transmission system, which plays many different roles in the power system. As a typical reactor structure, the split-core reactor can reduce the residual magnetism and effectively control the inductance. In recent years, it has developed rapidly and has been widely used. The vibration noise generated by the power equipment in operation not only affects its normal operation and service life, but also produces audible noise and other environmental problems [1]. How to reduce its vibration noise effectively has become an urgent problem for manufacturers and power departments. Accurate measurement of magnetization and magnetostrictive properties of silicon steel is the basis for the study of reactor noise and vibration. Lieven Vandevelde, a Belgian scholar, puts forward the method of calculating the deformation of an object due to maxwell and magnetostrictive force by means of finite element analysis [2]. GaoYanhui, Japan, Kazyhiro Muramatsu USES the relationship between the node displacement, the magnetostrictive stress of the node and the distance between the node and the center point to calculate the vibration displacement of the iron core of the reactor [3]. In the literature [4], the British scholar Annable Shahaj proposed using magnetic twin chips to control the magnetostriction on the stator teeth of the motor, and the magnetostrictive force components were offset by the magnetostrictive force. Manufacturers often compression core column and base structure, such as the increase of rubber vibration isolator between ontology and body and improve the air gap materials and other methods of reducing the electromagnetic vibration in the reactor from the vibration mechanism of reactor vibration noise research is less. Calculating the magnitude and distribution of electromagnetic vibrations is necessary for designing reactors with lower vibration noise. Based on the measurement results of the magnetization and magnetostrictive properties of orientation silicon steel and non-oriented silicon steel, the model of three-dimensional split-core reactor is established. Based on the inherent magnetostrictive properties of oriented and non-oriented silicon steel sheets, a new type of iron core with alternating core-column structure consisting of oriented silicon steel sheet and non-oriented silicon steel sheet was proposed. Numerical calculation of magnetic field, stress field and vibration displacement of reactor under ordinary structure and new structure, the results show that the method has a certain damping effect.","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"8 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82025157","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 : 2018-04-01DOI: 10.1109/INTMAG.2018.8508090
J. Li, Q. Yang, S. Wang, Y. Li
Body: By applying electromagnetic diffusion equation, skin effect in electrical steel sheets in the condition of alternating excitation is analyzed based on Maxwell electromagnetic field theory. Due to skin effect is more significant mainly at high frequency, non-dimensionalized treatment for the diffusion equation is produced and eddy current loss is calculated by considering or not skin effect, respectively. Meanwhile, broadband magnetic losses and separation of typical electrical steel are obtained by using a 3-D magnetic properties testing system to bring to light the emergence of skin effect under rotational excitation. The simplification of magnetic constitutive equation is proposed and introduced into the diffusion equation, which is solved by employing finite elements coupled to Fredholm's equation. An approximate expression for the rotational eddy current loss component with skin effect is eventually written.
{"title":"Skin Effect and Eddy Current Loss in Electrical Steel Sheets under Applied Excitation Fields.","authors":"J. Li, Q. Yang, S. Wang, Y. Li","doi":"10.1109/INTMAG.2018.8508090","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508090","url":null,"abstract":"Body: By applying electromagnetic diffusion equation, skin effect in electrical steel sheets in the condition of alternating excitation is analyzed based on Maxwell electromagnetic field theory. Due to skin effect is more significant mainly at high frequency, non-dimensionalized treatment for the diffusion equation is produced and eddy current loss is calculated by considering or not skin effect, respectively. Meanwhile, broadband magnetic losses and separation of typical electrical steel are obtained by using a 3-D magnetic properties testing system to bring to light the emergence of skin effect under rotational excitation. The simplification of magnetic constitutive equation is proposed and introduced into the diffusion equation, which is solved by employing finite elements coupled to Fredholm's equation. An approximate expression for the rotational eddy current loss component with skin effect is eventually written.","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"16 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83650272","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 : 2018-04-01DOI: 10.1109/INTMAG.2018.8508111
K. Pituso, C. Warisarn, D. Tongsomporn
Two-dimensional magnetic recording (TDMR) [1, 2] is a promising high density storage technology, which is expected to increase an areal density (AD) up to 10 terabit per square inch (Tbpsi). This technology is required write narrow-read wide technique that opposite to write wide-read narrow of one-dimensional (1D) read channel. The narrow track writing operated by shingled writing can greatly improve track per inch (TPI) gain. However, the side reading effect of reader is an unwanted situation because the intertrack interference (ITI) from sidetracks, which degrades the overall system bit error rate (BER) performance. Therefore, we introduce the methods to overcome this severe ITI effect. For instance, the two-dimensional (2D) modulation code that designed based on cross-track data dependent readback. The data pattern such as [1 −1 1]T and [−1 1 −1]T are forbidden to record onto medium. The rate-5/6 2D modulation code will map the 5 user bits into a 6-bits codeword, which are not contained any forbidden patterns. Furthermore, since the recoded bit is protected from severe ITI effect using modulation code, the middle track can provide a very high reliability. Therefore, we present ITI subtraction to improve upper and lower track performance using data from middle track. Moreover, we also propose an unbalanced track pitch technique, which the middle track can be narrower than upper and lower tracks. The utilization from the high reliability of middle track can improve BER performances both of upper and lower tracks. The reason because the ITI effect that interfere from their sidetracks is reduced by using the properly wider track pitch.
{"title":"Unbalanced Track Pitch Combined with 2D Modulation Code in TDMR Systems.","authors":"K. Pituso, C. Warisarn, D. Tongsomporn","doi":"10.1109/INTMAG.2018.8508111","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508111","url":null,"abstract":"Two-dimensional magnetic recording (TDMR) [1, 2] is a promising high density storage technology, which is expected to increase an areal density (AD) up to 10 terabit per square inch (Tbpsi). This technology is required write narrow-read wide technique that opposite to write wide-read narrow of one-dimensional (1D) read channel. The narrow track writing operated by shingled writing can greatly improve track per inch (TPI) gain. However, the side reading effect of reader is an unwanted situation because the intertrack interference (ITI) from sidetracks, which degrades the overall system bit error rate (BER) performance. Therefore, we introduce the methods to overcome this severe ITI effect. For instance, the two-dimensional (2D) modulation code that designed based on cross-track data dependent readback. The data pattern such as [1 −1 1]T and [−1 1 −1]T are forbidden to record onto medium. The rate-5/6 2D modulation code will map the 5 user bits into a 6-bits codeword, which are not contained any forbidden patterns. Furthermore, since the recoded bit is protected from severe ITI effect using modulation code, the middle track can provide a very high reliability. Therefore, we present ITI subtraction to improve upper and lower track performance using data from middle track. Moreover, we also propose an unbalanced track pitch technique, which the middle track can be narrower than upper and lower tracks. The utilization from the high reliability of middle track can improve BER performances both of upper and lower tracks. The reason because the ITI effect that interfere from their sidetracks is reduced by using the properly wider track pitch.","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"30 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2018-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89584015","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 : 2018-04-01DOI: 10.1109/INTMAG.2018.8508589
Haitao Wang, S. Fang, T. Jahns, Hui Yang, Heyun Lin
Various new magnet arrangements used in dual-stator permanent-magnet vernier machine (DSPMVM) are proposed that develop dual-excitation conditions on both sides of the machine’s airgaps (either stator-stator or stator-rotor) in order to increase the torque production by enhancing the airgap flux density in the inner and outer machine layers. The DSPMVM with sandwiched rotor combines features of the dual-stator and vernier structures. As a result, the proposed machine topologies are able to deliver high torque production by taking advantage of rich modulated harmonics. The topologies, operating principles, and the key design parameters of all the four DSPMVM configurations are presented. The electromagnetic performance of the proposed topologies including back electromotive force, airgap flux density, and torque characteristics are investigated and compared using 2D finite element analysis. The results show that the DSPMVM with flux-reversal magnets arrangement delivers high average torque with low cogging and ripple torque which are desired features for the telescope application.
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