Pub Date : 2018-04-24DOI: 10.1109/INTMAG.2018.8508583
B. Ducharne, B. Gupta, Y. Hebrard, J. Coudert
Post-treatment and rescaling, it is possible to plot local hysteresis cycles from the measurement of local magnetic Barkhausen noise. If the material is homogeneous and if similar excitation conditions are imposed, the local hysteresis cycles obtained are comparable to the classical magnetic hysteresis cycles B(H)(the cross-section magnetic average induction B as a function of the surface tangential excitation field H). These local Barkhausen noise hysteresis cycles give interesting clues about the evolution of the microstructure of the magnetic material (internal stresses, level of degradation etc.). This makes it an indispensable tool for the non-destructive evaluation of ferromagnetic steels. In this paper, a phenomenological modeling of the Barkhausen noise from the local modeling of B subjected to an excitation field H and/or a uni-axial mechanical stress T is proposed. The objective is to provide an absolute quantification of the internal residual stresses because of the Barkhausen noise measurements.
{"title":"Characterization and local phenomenological model of Barkhausen noise under mechanical and magnetic excitations.","authors":"B. Ducharne, B. Gupta, Y. Hebrard, J. Coudert","doi":"10.1109/INTMAG.2018.8508583","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508583","url":null,"abstract":"Post-treatment and rescaling, it is possible to plot local hysteresis cycles from the measurement of local magnetic Barkhausen noise. If the material is homogeneous and if similar excitation conditions are imposed, the local hysteresis cycles obtained are comparable to the classical magnetic hysteresis cycles B(H)(the cross-section magnetic average induction B as a function of the surface tangential excitation field H). These local Barkhausen noise hysteresis cycles give interesting clues about the evolution of the microstructure of the magnetic material (internal stresses, level of degradation etc.). This makes it an indispensable tool for the non-destructive evaluation of ferromagnetic steels. In this paper, a phenomenological modeling of the Barkhausen noise from the local modeling of B subjected to an excitation field H and/or a uni-axial mechanical stress T is proposed. The objective is to provide an absolute quantification of the internal residual stresses because of the Barkhausen noise measurements.","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"61 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2018-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83010907","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 : 2018-04-24DOI: 10.1109/INTMAG.2018.8508171
B. Gupta, B. Ducharne, G. Sebald, T. Uchimoto
All materials interact with an external magnetic field to some extent quantified by the magnetic susceptibility c. There is a correlation between local c value and local anomalies of material composition, deformation and stress, which makes it interesting to explore related sensor principles with a potential for NDT application. This contribution however concerns a modification over the magnetic force based sensor for laterally resolved susceptibility measurement and demonstrates the possible range of NDT applications on different non-ferromagnetic material samples. This sensor however eliminates the use of cantilever to avoid possible vibrations in the industrial environment.
{"title":"Magnetic non-destructive materials characterization of nonferromagnetic materials using magnetic susceptibility.","authors":"B. Gupta, B. Ducharne, G. Sebald, T. Uchimoto","doi":"10.1109/INTMAG.2018.8508171","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508171","url":null,"abstract":"All materials interact with an external magnetic field to some extent quantified by the magnetic susceptibility c. There is a correlation between local c value and local anomalies of material composition, deformation and stress, which makes it interesting to explore related sensor principles with a potential for NDT application. This contribution however concerns a modification over the magnetic force based sensor for laterally resolved susceptibility measurement and demonstrates the possible range of NDT applications on different non-ferromagnetic material samples. This sensor however eliminates the use of cantilever to avoid possible vibrations in the industrial environment.","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"38 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2018-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77316921","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 : 2018-04-23DOI: 10.1109/INTMAG.2018.8508137
M. Zimmermann, Alexander Lange, B. Piepenbreier
Current industrial trends show a growing interest for variable speed drives, energy efficiency and environmental sustainability. Synchronous Reluctance Machines (SynRM) and Permanent Magnet assisted Synchronous Reluctance Machines (PMaSynRM) can fulfil these requirements with proper designs. This paper provides experimental results of a PMaSynRM with a ribless rotor. This design is characterized by an increased magnetic saliency for sensorless control and torque contribution. By the use of ferrite magnets and a glass fiber rotor bandage, a good efficiency and an excellent anisotropy in all current operating points can be achieved. Control strategies for synchronous machines require precise knowledge of the machine parameters. Therefore, the identification of the steady-state inductances and a detailed measurement routine is provided. The measurements prove a distinct saliency.
{"title":"Experimental Results and Parameter Identification of a Permanent Magnet assisted Synchronous Reluctance Machine with a Ribless Rotor","authors":"M. Zimmermann, Alexander Lange, B. Piepenbreier","doi":"10.1109/INTMAG.2018.8508137","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508137","url":null,"abstract":"Current industrial trends show a growing interest for variable speed drives, energy efficiency and environmental sustainability. Synchronous Reluctance Machines (SynRM) and Permanent Magnet assisted Synchronous Reluctance Machines (PMaSynRM) can fulfil these requirements with proper designs. This paper provides experimental results of a PMaSynRM with a ribless rotor. This design is characterized by an increased magnetic saliency for sensorless control and torque contribution. By the use of ferrite magnets and a glass fiber rotor bandage, a good efficiency and an excellent anisotropy in all current operating points can be achieved. Control strategies for synchronous machines require precise knowledge of the machine parameters. Therefore, the identification of the steady-state inductances and a detailed measurement routine is provided. The measurements prove a distinct saliency.","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"59 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84301956","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 : 2018-04-23DOI: 10.1109/INTMAG.2018.8508462
D. Thyroff, C. Hittinger, I. Hahn
Low voltage traction applications demand high torques at low speeds and at a small design space. In order to achieve high torque densities, manufacturers often combine high-speed machines with mechanical gearboxes. In the past decade, flux modulation machines came up, offering low speeds and high torque densities by utilizing the magnetic gearing effect. The idea is to remove the mechanical gear and get a compact direct drive solution. Now, the Vernier machines are a subgroup of the flux modulation machines. However, literature reports very poor power factors for Vernier machines in comparison to PM machines as the main drawback. Nevertheless, the presented studies always assume a fixed speed and only one single current operating point. This is correct for fixed speed applications, e.g. pumps and blowers, but it is not correct for traction applications, because the machine cycles dynamically through the torque-speed curve. Therefore, this paper first investigates the machine design requirements considering the machine control strategies and the needs of traction applications. Furthermore, a method to check if the design fulfills the given requirements by calculating only a single operating point is presented. In addition, the emerging differences between Vernier and PM machines are explained using analytic results. Furthermore, the paper presents a power factor comparison of torque optimized Vernier and PM machines while considering iron losses. Thereby, the comparison covers the whole torque-speed range, including the field weakening area.
{"title":"Comparison of the Power Factor of SMPM and SM Vernier Outer Runner Machines for Traction Applications","authors":"D. Thyroff, C. Hittinger, I. Hahn","doi":"10.1109/INTMAG.2018.8508462","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508462","url":null,"abstract":"Low voltage traction applications demand high torques at low speeds and at a small design space. In order to achieve high torque densities, manufacturers often combine high-speed machines with mechanical gearboxes. In the past decade, flux modulation machines came up, offering low speeds and high torque densities by utilizing the magnetic gearing effect. The idea is to remove the mechanical gear and get a compact direct drive solution. Now, the Vernier machines are a subgroup of the flux modulation machines. However, literature reports very poor power factors for Vernier machines in comparison to PM machines as the main drawback. Nevertheless, the presented studies always assume a fixed speed and only one single current operating point. This is correct for fixed speed applications, e.g. pumps and blowers, but it is not correct for traction applications, because the machine cycles dynamically through the torque-speed curve. Therefore, this paper first investigates the machine design requirements considering the machine control strategies and the needs of traction applications. Furthermore, a method to check if the design fulfills the given requirements by calculating only a single operating point is presented. In addition, the emerging differences between Vernier and PM machines are explained using analytic results. Furthermore, the paper presents a power factor comparison of torque optimized Vernier and PM machines while considering iron losses. Thereby, the comparison covers the whole torque-speed range, including the field weakening area.","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"8 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2018-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83572950","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 : 2018-04-23DOI: 10.1109/INTMAG.2018.8508779
R. Xu, M. Zhou, Y. Wang
With the rapid development of micro-nano manufacturing technology, there are more and more fields need nano-driven control technology, such as the high-precision positioning systems [1]. Magnetically controlled shape memory (MSM)-alloy actuators serve as the core part of high-precision positioning system on account of their high precision, large energy density, and small volume. The hysteresis nonlinearity of the MSM-alloy actuator, however, severely damages the positional accuracy of the positioning system. In order to research the hysteresis nonlinearity in the MSM-alloy actuator, hysteresis nonlinearity modeling has become a significant hot spot of research [2] [3]. The purpose of this study is to structure an excellent hysteresis nonlinearity model to capture the hysteresis nonlinearity in MSM-alloy actuators. The criterion for evaluating modeling performance is that the established hysteresis model can embody the actual characteristic of the actuator. In this study, a novel black-box model composed of the hysteresis-like structure and a nonlinear function is proposed to capture the hysteresis nonlinearity of the MSM-alloy actuator. The proposed black-box hysteresis nonlinearity modeling approach has the advantages of requiring no prior knowledge and internal physical mechanism. The hysteresis-like structure solves the multi-value mapping problem and accurately depicts the major and minor hysteresis loops of the MSM-alloy actuator. The nonlinear function represents the nonlinearity part of the MSM-alloy actuator, which is identified using least squares support vector machines (LS-SVM) on account of its strong approximation capability, high generalization ability, less parameters, and great computing power. The schematic diagram of black-box model is shown in Fig. 1. u(k) is the input current at k time, y(k) is the output displacement at k time, F[⋅] is the nonlinear function, Hu[⋅] is the hysteresis-like part of the black-box model. In the procedure of modeling, u(k) and y(k) are the input values of hysteresis-like part; u(k), y(k), and Hu[⋅] are the input values of nonlinear function, which is obtained by the LS-SVM. To certify the effectiveness of the black-box model, the simulations are implemented using the obtained experimental data. The simulations show that the modeling error rate of the novel black-box model based on the LS-SVM is 1.37%, which is improved 73.97% in compared with the results in [4]. It is obvious that the modeling precision of the proposed hysteresis model is within the allowable range. The simulation results are shown in Fig.2. The blue solid line is the obtained experimental data, and the red dotted line is the output of the proposed black-box model. As shown in Fig.2(a), the proposed black-box model based on the LS-SVM can accurately describe the major and minor hysteresis loops of the MSM-alloy actuator. The modeling error curve is shown in Fig.2(b). In the future, the proposed black-box model can lay a foundation
{"title":"Hysteresis Nonlinearity Modeling for Magnetics Shape Mem-ory Alloy Actuator Based on a Novel Black-box Model with Least Squares Support Vector Machines.","authors":"R. Xu, M. Zhou, Y. Wang","doi":"10.1109/INTMAG.2018.8508779","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508779","url":null,"abstract":"With the rapid development of micro-nano manufacturing technology, there are more and more fields need nano-driven control technology, such as the high-precision positioning systems [1]. Magnetically controlled shape memory (MSM)-alloy actuators serve as the core part of high-precision positioning system on account of their high precision, large energy density, and small volume. The hysteresis nonlinearity of the MSM-alloy actuator, however, severely damages the positional accuracy of the positioning system. In order to research the hysteresis nonlinearity in the MSM-alloy actuator, hysteresis nonlinearity modeling has become a significant hot spot of research [2] [3]. The purpose of this study is to structure an excellent hysteresis nonlinearity model to capture the hysteresis nonlinearity in MSM-alloy actuators. The criterion for evaluating modeling performance is that the established hysteresis model can embody the actual characteristic of the actuator. In this study, a novel black-box model composed of the hysteresis-like structure and a nonlinear function is proposed to capture the hysteresis nonlinearity of the MSM-alloy actuator. The proposed black-box hysteresis nonlinearity modeling approach has the advantages of requiring no prior knowledge and internal physical mechanism. The hysteresis-like structure solves the multi-value mapping problem and accurately depicts the major and minor hysteresis loops of the MSM-alloy actuator. The nonlinear function represents the nonlinearity part of the MSM-alloy actuator, which is identified using least squares support vector machines (LS-SVM) on account of its strong approximation capability, high generalization ability, less parameters, and great computing power. The schematic diagram of black-box model is shown in Fig. 1. u(k) is the input current at k time, y(k) is the output displacement at k time, F[⋅] is the nonlinear function, Hu[⋅] is the hysteresis-like part of the black-box model. In the procedure of modeling, u(k) and y(k) are the input values of hysteresis-like part; u(k), y(k), and Hu[⋅] are the input values of nonlinear function, which is obtained by the LS-SVM. To certify the effectiveness of the black-box model, the simulations are implemented using the obtained experimental data. The simulations show that the modeling error rate of the novel black-box model based on the LS-SVM is 1.37%, which is improved 73.97% in compared with the results in [4]. It is obvious that the modeling precision of the proposed hysteresis model is within the allowable range. The simulation results are shown in Fig.2. The blue solid line is the obtained experimental data, and the red dotted line is the output of the proposed black-box model. As shown in Fig.2(a), the proposed black-box model based on the LS-SVM can accurately describe the major and minor hysteresis loops of the MSM-alloy actuator. The modeling error curve is shown in Fig.2(b). In the future, the proposed black-box model can lay a foundation ","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"54 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2018-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86386203","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 : 2018-04-23DOI: 10.1109/INTMAG.2018.8508860
Shunsuke Noguchi, H. Dohmeki
Double winding machine is known that these machines have fault tolerant feature, so it is got much attention especially for application which needs failure tolerance like aircraft, electric vehicle, electric rolling stock, and marine ship. Controlling each winding by independent inverters lets improvement drive characteristics like extending speed range, and reducing torque ripples. But controlling each winding by independent inverters expects letting improvement drive characteristics like extending speed range, and reducing torque ripples, so it is widely considered. In this paper, we use 2 inverter which controlled by 1 microcontroller for driving 10poles-12slots double winding PMSM, operate the motor in situation of current phase difference, and operate the motor in situation when 1 inverter is failure. Then we verify fault tolerance characteristics of the PMSM, and examine improving the PMSM torque characteristics by measuring the torque characteristics. Therefore, it is confirmed that double winding PMSM used in this paper with driving by 2 inverter can keep redundancy and get fault tolerant characteristics, and found that it is possible to reduce torque ripple by inverter phase differential operating. In this test motor, it is found that the torque ripple can reduce by exciting current having 30degree of phase difference to the motor.
{"title":"Improvement of torque ripple characteristics of double winding PMSM with using twin inverters","authors":"Shunsuke Noguchi, H. Dohmeki","doi":"10.1109/INTMAG.2018.8508860","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508860","url":null,"abstract":"Double winding machine is known that these machines have fault tolerant feature, so it is got much attention especially for application which needs failure tolerance like aircraft, electric vehicle, electric rolling stock, and marine ship. Controlling each winding by independent inverters lets improvement drive characteristics like extending speed range, and reducing torque ripples. But controlling each winding by independent inverters expects letting improvement drive characteristics like extending speed range, and reducing torque ripples, so it is widely considered. In this paper, we use 2 inverter which controlled by 1 microcontroller for driving 10poles-12slots double winding PMSM, operate the motor in situation of current phase difference, and operate the motor in situation when 1 inverter is failure. Then we verify fault tolerance characteristics of the PMSM, and examine improving the PMSM torque characteristics by measuring the torque characteristics. Therefore, it is confirmed that double winding PMSM used in this paper with driving by 2 inverter can keep redundancy and get fault tolerant characteristics, and found that it is possible to reduce torque ripple by inverter phase differential operating. In this test motor, it is found that the torque ripple can reduce by exciting current having 30degree of phase difference to the motor.","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"9 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91042565","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 : 2018-04-23DOI: 10.1109/INTMAG.2018.8508053
X. Zhang, J. Xia, Y. Zhou, X. Liu, H. Zhang, M. Ezawa
The magnetic skyrmion is an exotic and versatile topological object in condensed matter physics, which promises novel applications in electronic and spintronic devices [1–2]. Recently, a rich phase diagram of an anisotropic frustrated magnet and properties of frustrated skyrmions with arbitrary vorticity and helicity were investigated [3]. Other remarkable physical properties of skyrmions in the frustrated magnetic system have also been studied theoretically [4–6]. Here, we explore the skyrmion dynamics in a frustrated magnet based on the J1-J2-J3 classical Heisenberg model explicitly by including the dipole-dipole interaction [7]. The skyrmion energy acquires a helicity dependence due to the dipole-dipole interaction, resulting in the current-induced translational motion with a fixed helicity. The lowest-energy states are the degenerate Bloch-type states, which can be used for building the binary memory. By increasing the driving current, the helicity locking-unlocking transition occurs, where the translational motion changes to the rotational motion. Furthermore, we demonstrate that two skyrmions can spontaneously form a bound state. The separation of the bound state forced by a driving current is also studied. In addition, we show the annihilation of a pair of skyrmion and antiskyrmion. Our results reveal the distinctive frustrated skyrmions may enable new applications.
{"title":"Current-induced skyrmion dynamics in a frustrated magnetic film.","authors":"X. Zhang, J. Xia, Y. Zhou, X. Liu, H. Zhang, M. Ezawa","doi":"10.1109/INTMAG.2018.8508053","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508053","url":null,"abstract":"The magnetic skyrmion is an exotic and versatile topological object in condensed matter physics, which promises novel applications in electronic and spintronic devices [1–2]. Recently, a rich phase diagram of an anisotropic frustrated magnet and properties of frustrated skyrmions with arbitrary vorticity and helicity were investigated [3]. Other remarkable physical properties of skyrmions in the frustrated magnetic system have also been studied theoretically [4–6]. Here, we explore the skyrmion dynamics in a frustrated magnet based on the J1-J2-J3 classical Heisenberg model explicitly by including the dipole-dipole interaction [7]. The skyrmion energy acquires a helicity dependence due to the dipole-dipole interaction, resulting in the current-induced translational motion with a fixed helicity. The lowest-energy states are the degenerate Bloch-type states, which can be used for building the binary memory. By increasing the driving current, the helicity locking-unlocking transition occurs, where the translational motion changes to the rotational motion. Furthermore, we demonstrate that two skyrmions can spontaneously form a bound state. The separation of the bound state forced by a driving current is also studied. In addition, we show the annihilation of a pair of skyrmion and antiskyrmion. Our results reveal the distinctive frustrated skyrmions may enable new applications.","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"57 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2018-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90252465","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 : 2018-04-23DOI: 10.1109/INTMAG.2018.8508594
Nur Afifah Kamaruzaman, W. Robertson, M. Ghayesh, B. Cazzolato, A. Zander
Presented in this paper is a modified design of a planar quasi-zero stiffness magnetic levitation vibration isolation system. A new design parameter referred to as horizontal gap is introduced to create a lever arm in the horizontal direction, and its effects on the load bearing capacity and planar stability of the system are investigated. Static and dynamic simulations of the system have revealed that the lever arm is capable of reducing the instability in the rotational degree of freedom without affecting the translational axes, thus minimising the control effort required for a stable operation.
{"title":"Improving Passive Stability of a Planar Quasi-Zero Stiffness Magnetic Levitation System via Lever Arm","authors":"Nur Afifah Kamaruzaman, W. Robertson, M. Ghayesh, B. Cazzolato, A. Zander","doi":"10.1109/INTMAG.2018.8508594","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508594","url":null,"abstract":"Presented in this paper is a modified design of a planar quasi-zero stiffness magnetic levitation vibration isolation system. A new design parameter referred to as horizontal gap is introduced to create a lever arm in the horizontal direction, and its effects on the load bearing capacity and planar stability of the system are investigated. Static and dynamic simulations of the system have revealed that the lever arm is capable of reducing the instability in the rotational degree of freedom without affecting the translational axes, thus minimising the control effort required for a stable operation.","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"56 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84539535","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 : 2018-04-23DOI: 10.1109/INTMAG.2018.8508628
K. Motoki, Y. Kobayashi, Naoya Jike, T. Fukami, M. Koyama, Takeshi Mori, M. Yamada, M. Nakano
The electromagnet-assisted ferrite magnet motor (EMaFM) is a new type of rare-earth-free motor in which the torque due to a ferrite magnet motor is assisted by the variable magnetic force of an electromagnet motor. In this paper, an axial-gap EMaFM (AG-EMaFM), which combines a ferrite magnet motor with an electromagnet motor in the axial direction, is newly proposed. Its topology and operating principle are also presented. The proposed AG-EMaFM makes it easy to increase the conductor areas of the windings and can offer satisfactory torque density. To verify this concept, the electromagnetic performance of the proposed AG-EMaFM is investigated using a three-dimensional finite element analysis and compared with a radial-gap EMaFM of the same size.
{"title":"Investigation of an Axial-Gap Electromagnet-Assisted Ferrite Magnet Motor","authors":"K. Motoki, Y. Kobayashi, Naoya Jike, T. Fukami, M. Koyama, Takeshi Mori, M. Yamada, M. Nakano","doi":"10.1109/INTMAG.2018.8508628","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508628","url":null,"abstract":"The electromagnet-assisted ferrite magnet motor (EMaFM) is a new type of rare-earth-free motor in which the torque due to a ferrite magnet motor is assisted by the variable magnetic force of an electromagnet motor. In this paper, an axial-gap EMaFM (AG-EMaFM), which combines a ferrite magnet motor with an electromagnet motor in the axial direction, is newly proposed. Its topology and operating principle are also presented. The proposed AG-EMaFM makes it easy to increase the conductor areas of the windings and can offer satisfactory torque density. To verify this concept, the electromagnetic performance of the proposed AG-EMaFM is investigated using a three-dimensional finite element analysis and compared with a radial-gap EMaFM of the same size.","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"1 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88418878","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 : 2018-04-23DOI: 10.1109/INTMAG.2018.8508694
J. Schlipf, Y. Itabashi, T. Goto, H. Takagi, P. Lim, Y. Nakamura, I. Fischer, J. Schulze, H. Uchida, M. Inoue
Magneto-optical (MO) effects enable non-reciprocal optical components like optical circulators and isolators as well as a magneto-optical spatial light modulator with switching speeds superior to a digital micromirror and a liquid crystal device. To develop a magneto-optical device with high performance, it is desirable to use materials with large rotation angles and small extinction coefficients. In other approaches introduction of nanostructures, magnetophotonic crystals [1] and localized surface plasmon resonance (LSPR) [2] has been shown to provide enhancement of the Faraday effect for distinct wavelengths. This work shows how rectangular arrays of gold (Au) particles embedded into thin films of bismuth-substituted yttrium iron garnet (Bi:YIG) offer different phenomena in comparison with the square arrays previously studied [3] [4] [5]. This enhancement of Faraday rotation was first observed in samples fabricated and characterized experimentally [6].
{"title":"FDTD simulation of enhanced Faraday effect in plasmonic composite structures with rectangularly arranged Au particles.","authors":"J. Schlipf, Y. Itabashi, T. Goto, H. Takagi, P. Lim, Y. Nakamura, I. Fischer, J. Schulze, H. Uchida, M. Inoue","doi":"10.1109/INTMAG.2018.8508694","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508694","url":null,"abstract":"Magneto-optical (MO) effects enable non-reciprocal optical components like optical circulators and isolators as well as a magneto-optical spatial light modulator with switching speeds superior to a digital micromirror and a liquid crystal device. To develop a magneto-optical device with high performance, it is desirable to use materials with large rotation angles and small extinction coefficients. In other approaches introduction of nanostructures, magnetophotonic crystals [1] and localized surface plasmon resonance (LSPR) [2] has been shown to provide enhancement of the Faraday effect for distinct wavelengths. This work shows how rectangular arrays of gold (Au) particles embedded into thin films of bismuth-substituted yttrium iron garnet (Bi:YIG) offer different phenomena in comparison with the square arrays previously studied [3] [4] [5]. This enhancement of Faraday rotation was first observed in samples fabricated and characterized experimentally [6].","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"103 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86653995","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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