Pub Date : 2018-04-23DOI: 10.1109/INTMAG.2018.8508342
J. V. Dam, B. Gysen, M. Dhaens, Elena A. Lomonova
An automotive, fluid-control solenoid valve is composed of an electromagnetic reluctance actuator and a near-constant-force spring. Reluctance actuators are applied as electromagnetic brakes in aerospace applications [1], as valves that perform fast sorting tasks by means of short air-pulses in the manufacturing industry [2], as accurate fluid-control valves in petrochemical processes [3], and in the automotive industry to achieve variable valve timing in camless engines [4]. Common desires are a fast switching and low noise upon impact. Preferably, these objectives are met with minimized energy consumption, especially during constant position operation. In addition, minimizing the impact velocity improves valve lifetime and reduces the audible noise, vibration, and harshness (NVH). This paper considers cylindrical reluctance actuators due to their low cost. However, this complicates the use of laminations to minimize eddy current effects in a cost-effective manner. Proper analysis, design, and optimization of the reluctance actuator can, therefore, only be performed if these dynamic effects in the actuator are accounted for. This paper will focus on incorporating the eddy current effect in the models and their effect on performance, as well as control methods to improve the performance and minimize energy consumption. The performance of a classical reluctance actuator (Fig. 1a) is compared to a PM-biased topology (Fig. 1b) which reduces the energy consumption. Modeling is performed using transient, axisymmetric, nonlinear finite element (FE) simulations, coupled to Matlab-Simulink. Actuator topology and constraints Two single-coil reluctance actuators are shown in Fig. 1. One is a classical reluctance actuator with a stationary coil and a moving plunger (CLA). A second actuator includes a permanent magnet atop the core (PMB) to allow zero-power latching by means of a passive attraction force [1], [3], [5]. In addition, the actuator height and diameter are 16 and 13 mm, with a stroke of 0.25 mm. Moreover, the plunger of mass 1.2 g experiences an opposing force of 4 to 12N. Finally, the closed-toopen transition can last maximally 4 ms, with a typical valve-open time of several seconds. Open-loop simulation results In an open-loop co-simulation between Simulink and FE software, predefined voltage profiles are applied to the actuators, while the current is limited. In Fig. 2a, the electromagnetic force develops 0.075 ms slower in cases with eddy currents, and the final position is reached 0.115 ms later. This indicates the inherent eddy current damping in the device, slowing down the plunger. In addition, once the movement commences and the airgap closes, the developed electromagnetic force increases rapidly while the opposing force decreases, resulting in a quickly moving plunger. As a result of applying the voltage profiles in Fig. 2b, the corresponding coil currents develop. Note that equal voltages are applied to CLA and PMB until 1.15 ms, after
{"title":"Design, Control, and Comparison of Low-Energy Solenoid Valve Actuators","authors":"J. V. Dam, B. Gysen, M. Dhaens, Elena A. Lomonova","doi":"10.1109/INTMAG.2018.8508342","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508342","url":null,"abstract":"An automotive, fluid-control solenoid valve is composed of an electromagnetic reluctance actuator and a near-constant-force spring. Reluctance actuators are applied as electromagnetic brakes in aerospace applications [1], as valves that perform fast sorting tasks by means of short air-pulses in the manufacturing industry [2], as accurate fluid-control valves in petrochemical processes [3], and in the automotive industry to achieve variable valve timing in camless engines [4]. Common desires are a fast switching and low noise upon impact. Preferably, these objectives are met with minimized energy consumption, especially during constant position operation. In addition, minimizing the impact velocity improves valve lifetime and reduces the audible noise, vibration, and harshness (NVH). This paper considers cylindrical reluctance actuators due to their low cost. However, this complicates the use of laminations to minimize eddy current effects in a cost-effective manner. Proper analysis, design, and optimization of the reluctance actuator can, therefore, only be performed if these dynamic effects in the actuator are accounted for. This paper will focus on incorporating the eddy current effect in the models and their effect on performance, as well as control methods to improve the performance and minimize energy consumption. The performance of a classical reluctance actuator (Fig. 1a) is compared to a PM-biased topology (Fig. 1b) which reduces the energy consumption. Modeling is performed using transient, axisymmetric, nonlinear finite element (FE) simulations, coupled to Matlab-Simulink. Actuator topology and constraints Two single-coil reluctance actuators are shown in Fig. 1. One is a classical reluctance actuator with a stationary coil and a moving plunger (CLA). A second actuator includes a permanent magnet atop the core (PMB) to allow zero-power latching by means of a passive attraction force [1], [3], [5]. In addition, the actuator height and diameter are 16 and 13 mm, with a stroke of 0.25 mm. Moreover, the plunger of mass 1.2 g experiences an opposing force of 4 to 12N. Finally, the closed-toopen transition can last maximally 4 ms, with a typical valve-open time of several seconds. Open-loop simulation results In an open-loop co-simulation between Simulink and FE software, predefined voltage profiles are applied to the actuators, while the current is limited. In Fig. 2a, the electromagnetic force develops 0.075 ms slower in cases with eddy currents, and the final position is reached 0.115 ms later. This indicates the inherent eddy current damping in the device, slowing down the plunger. In addition, once the movement commences and the airgap closes, the developed electromagnetic force increases rapidly while the opposing force decreases, resulting in a quickly moving plunger. As a result of applying the voltage profiles in Fig. 2b, the corresponding coil currents develop. Note that equal voltages are applied to CLA and PMB until 1.15 ms, after","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"10 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":"84094010","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.2018.8508657
K. Rubi, R. Mahendiran
We measured the magnetization (M) and heat capacity (Cp) in the perovskite ferroelectric BaTiO3 wherein 40 % Ba site is replaced by magnetic Eu2+ (4f7, S = 7/2) ions. The temperature dependence of M and Cp suggest that Ba0.6Eu0.4TiO3- is paramagnetic at and above 2.5 K. Isothermal magnetization and heat capacity data were used to estimate isothermal magnetic entropy change left(DeltaS_{mathrm {m right) and adiabatic temperature change. It is found that this magneto-ferroelectric compound exhibits and adiabatic temperature change. It is found that this magneto-ferroelectric compound exhibits 16.2 K as the field is changed from 0 T to 7 T, which suggests that this compound could be a potential candidate for cryogenic magnetic cooling.
我们测量了钙钛矿铁电BaTiO3的磁化强度(M)和热容量(Cp) % Ba site is replaced by magnetic Eu2+ (4f7, S = 7/2) ions. The temperature dependence of M and Cp suggest that Ba0.6Eu0.4TiO3- is paramagnetic at and above 2.5 K. Isothermal magnetization and heat capacity data were used to estimate isothermal magnetic entropy change left(DeltaS_{mathrm {m right) and adiabatic temperature change. It is found that this magneto-ferroelectric compound exhibits and adiabatic temperature change. It is found that this magneto-ferroelectric compound exhibits 16.2 K as the field is changed from 0 T to 7 T, which suggests that this compound could be a potential candidate for cryogenic magnetic cooling.
{"title":"Magnetocaloric effect in a diluted ferroelectric: Ba0.6 Eu0.4TiO3","authors":"K. Rubi, R. Mahendiran","doi":"10.1109/INTMAG.2018.8508657","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508657","url":null,"abstract":"We measured the magnetization (M) and heat capacity (C<inf>p</inf>) in the perovskite ferroelectric BaTiO<inf>3</inf> wherein 40 % Ba site is replaced by magnetic Eu<sup>2+</sup> (4f<sup>7</sup>, S = 7/2) ions. The temperature dependence of M and C<inf>p</inf> suggest that Ba<inf>0.6</inf>Eu<inf>0.4</inf>TiO<inf>3</inf>- is paramagnetic at and above 2.5 K. Isothermal magnetization and heat capacity data were used to estimate isothermal magnetic entropy change left(DeltaS_{mathrm {m right) and adiabatic temperature change. It is found that this magneto-ferroelectric compound exhibits and adiabatic temperature change. It is found that this magneto-ferroelectric compound exhibits 16.2 K as the field is changed from 0 T to 7 T, which suggests that this compound could be a potential candidate for cryogenic magnetic cooling.","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"2 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":"89339295","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.2018.8508102
G. Manginas, G. Ababei, A. Damian, G. Stoian, M. Grigoraș, M. Tibu, H. Chiriac, T. Óvári, N. Lupu
The need for more efficient energy conversion and/or distribution systems is a challenging and strong demand nowadays. Among other materials, amorphous and/or nanocrystalline soft magnetic alloys are a viable alternative for both storage and transportation of the energy. In the recent years, they turned out to become competitive with silicon electrical steels and various ferrites for niche applications, mainly the ones involving working at high frequencies and temperatures [1]. The literature reports many attempts to improve the soft magnetic properties of Fe-based amorphous and/or nanocrystalline rapidly solidified materials, by modifying either the composition or annealing conditions. For example, it was shown that by replacing 22 at.% of Fe with Co, the Co-substituted FINEMET alloy can be used at 500 °C, the relatively low coercivity being preserved even at such high temperatures [2]. In order to study further these correlations and to understand why an amorphous and/or nanocrystalline material with nearly-zero magnetostriction has a large output response when subjected to a mechanical stress or vibration, in this work we will present comparatively our latest results on the collective behavior of nanograins in Co-substituted FINEMET and VITROPERM 800 rapidly quenched alloys, having nominal compositions (Fe1-x Cox)73.5 Cu1 Nb3 Si13.5 B9 and (Fe1-x Cox)73.5 Cu1 Nb3 Si15.5 B7, respectively (x = 0, 0.25, 0.5, 0.75 and 1), in the as-quenched state and after annealing at temperatures between 500 and 600 °C. Our study mainly focusses on how Co influences the precipitation and anisotropies of the nanograins, as well as the temperature variation of magnetic and magnetoelastic properties of the 2 systems. In addition, we were interested to understand why the small compositional variations of Si and B in FINEMET and VITROPERM 800 alloys are inducing a strongly different magnetoelastic behavior in the as-quenched amorphous samples, with small positive magnetostriction values for FINEMET samples and zero magnetostriction for VITROPERM 800 ones. The as-quenched samples are fully amorphous as one can see from the TEM images shown in Fig. 1, while the ones subjected to annealing are nanocrystalline, with grains of 15–30 nm, randomly dispersed within the amorphous matrix, depending on the annealing temperature and Co content. The optimum magnetic properties are obtained at different annealing temperatures (between 510 and 550 °C), depending on Co content, as shown in Fig. 1; the larger the Co content, the lower is the optimum annealing temperature. The total substitution of Fe with Co is strongly influencing the microstructure and is hardening the material (Fig. 2). The substitution of Fe with Co followed by optimum annealing reduces drastically the saturation magnetostriction due to the more random distribution of internal micro-stresses in Co-substituted samples compared with the ones containing Fe only, but also due to the different orientation of the aniso
{"title":"Collective Behavior of Nanograins in Co-Substituted Fe-Based Nanocrystalline Alloys","authors":"G. Manginas, G. Ababei, A. Damian, G. Stoian, M. Grigoraș, M. Tibu, H. Chiriac, T. Óvári, N. Lupu","doi":"10.1109/INTMAG.2018.8508102","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508102","url":null,"abstract":"The need for more efficient energy conversion and/or distribution systems is a challenging and strong demand nowadays. Among other materials, amorphous and/or nanocrystalline soft magnetic alloys are a viable alternative for both storage and transportation of the energy. In the recent years, they turned out to become competitive with silicon electrical steels and various ferrites for niche applications, mainly the ones involving working at high frequencies and temperatures [1]. The literature reports many attempts to improve the soft magnetic properties of Fe-based amorphous and/or nanocrystalline rapidly solidified materials, by modifying either the composition or annealing conditions. For example, it was shown that by replacing 22 at.% of Fe with Co, the Co-substituted FINEMET alloy can be used at 500 °C, the relatively low coercivity being preserved even at such high temperatures [2]. In order to study further these correlations and to understand why an amorphous and/or nanocrystalline material with nearly-zero magnetostriction has a large output response when subjected to a mechanical stress or vibration, in this work we will present comparatively our latest results on the collective behavior of nanograins in Co-substituted FINEMET and VITROPERM 800 rapidly quenched alloys, having nominal compositions (Fe1-x Cox)73.5 Cu1 Nb3 Si13.5 B9 and (Fe1-x Cox)73.5 Cu1 Nb3 Si15.5 B7, respectively (x = 0, 0.25, 0.5, 0.75 and 1), in the as-quenched state and after annealing at temperatures between 500 and 600 °C. Our study mainly focusses on how Co influences the precipitation and anisotropies of the nanograins, as well as the temperature variation of magnetic and magnetoelastic properties of the 2 systems. In addition, we were interested to understand why the small compositional variations of Si and B in FINEMET and VITROPERM 800 alloys are inducing a strongly different magnetoelastic behavior in the as-quenched amorphous samples, with small positive magnetostriction values for FINEMET samples and zero magnetostriction for VITROPERM 800 ones. The as-quenched samples are fully amorphous as one can see from the TEM images shown in Fig. 1, while the ones subjected to annealing are nanocrystalline, with grains of 15–30 nm, randomly dispersed within the amorphous matrix, depending on the annealing temperature and Co content. The optimum magnetic properties are obtained at different annealing temperatures (between 510 and 550 °C), depending on Co content, as shown in Fig. 1; the larger the Co content, the lower is the optimum annealing temperature. The total substitution of Fe with Co is strongly influencing the microstructure and is hardening the material (Fig. 2). The substitution of Fe with Co followed by optimum annealing reduces drastically the saturation magnetostriction due to the more random distribution of internal micro-stresses in Co-substituted samples compared with the ones containing Fe only, but also due to the different orientation of the aniso","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"21 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":"90439055","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.2018.8508112
H. Dhulipati, E. Ghosh, S. Mukundan, J. Tjong, N. Kar
Fractional slot concentrated windings (FSCW) permanent magnet synchronous machines (PMSM) have high content of space harmonics in the magnetomotive force (MMF) due to which the harmonic inductance is much larger than the magnetizing inductance [1]. These inductance harmonics lead to high torque ripple and low power factor. In case of FSCW, the coils are full pitched and cannot be chorded like in distributed windings to reduce inductance harmonics and also a suitable rotor structure have small impact on reduction of these harmonics. However, the space harmonic content in the FSCW PMSM vary significantly with the choice of slot-pole combination. Thus, the inductance harmonics can be modeled and minimized using an optimal choice of machine phases (m), stator slot numbers (S) and rotor poles (P). State of the art: [2] has presented the selection of slot, pole and phase numbers for reducing harmonic leakage inductance specifically for single layer CW PMSM. In [3], a detailed procedure for slot-pole selection based on inductances for single and double layer windings are provided. However, these are restricted for odd phase numbers and the selection process is time consuming. In this paper, the impact of winding layers, phase belt, slots, poles, and phase numbers on inductance harmonics has been studied. Further, an Adapative gradient (Adagrad) algorithm based approach is implemented to optimally select these parameters with little prior knowledge about the structural data.
{"title":"Adagrad Algorithm based Optimal Slot-pole Selection for Reduced Inductance Harmonics in Concentrated Wound Multiphase PMSM.","authors":"H. Dhulipati, E. Ghosh, S. Mukundan, J. Tjong, N. Kar","doi":"10.1109/INTMAG.2018.8508112","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508112","url":null,"abstract":"Fractional slot concentrated windings (FSCW) permanent magnet synchronous machines (PMSM) have high content of space harmonics in the magnetomotive force (MMF) due to which the harmonic inductance is much larger than the magnetizing inductance [1]. These inductance harmonics lead to high torque ripple and low power factor. In case of FSCW, the coils are full pitched and cannot be chorded like in distributed windings to reduce inductance harmonics and also a suitable rotor structure have small impact on reduction of these harmonics. However, the space harmonic content in the FSCW PMSM vary significantly with the choice of slot-pole combination. Thus, the inductance harmonics can be modeled and minimized using an optimal choice of machine phases (m), stator slot numbers (S) and rotor poles (P). State of the art: [2] has presented the selection of slot, pole and phase numbers for reducing harmonic leakage inductance specifically for single layer CW PMSM. In [3], a detailed procedure for slot-pole selection based on inductances for single and double layer windings are provided. However, these are restricted for odd phase numbers and the selection process is time consuming. In this paper, the impact of winding layers, phase belt, slots, poles, and phase numbers on inductance harmonics has been studied. Further, an Adapative gradient (Adagrad) algorithm based approach is implemented to optimally select these parameters with little prior knowledge about the structural data.","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"45 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":"90417022","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.2018.8508477
F. Du, S. Liu, N. Li, Y. Dou, X. Zhang, Y. Li
The research on the performance of ultra-high magnetic field radio frequency (RF) coils is one of the main aspects in the research of ultrahigh field magnetic resonance imaging (MRI)system. In this paper, a 1H/31P dual-tuned multi-channel RF coil for the ultrahigh magnetic field 7T MRI was proposed. The performance of the proposed coil is evaluated by using numerical co-simulation approach. The result demonstrates the feasibility of the proposed double-tuned RF coil in the applications of 1H/31P ultrahigh magnetic field.
{"title":"Design and Simulation of a Double Tuned RF Coil for 1H and 31P MR imaging at 7T.","authors":"F. Du, S. Liu, N. Li, Y. Dou, X. Zhang, Y. Li","doi":"10.1109/INTMAG.2018.8508477","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508477","url":null,"abstract":"The research on the performance of ultra-high magnetic field radio frequency (RF) coils is one of the main aspects in the research of ultrahigh field magnetic resonance imaging (MRI)system. In this paper, a 1H/31P dual-tuned multi-channel RF coil for the ultrahigh magnetic field 7T MRI was proposed. The performance of the proposed coil is evaluated by using numerical co-simulation approach. The result demonstrates the feasibility of the proposed double-tuned RF coil in the applications of 1H/31P ultrahigh magnetic field.","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"1 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":"91042698","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.2018.8508115
Y. Hane
Quantitative analysis of iron loss taking magnetic hysteresis behavior into account is essential to development of high-efficiency electric machines. In a previous paper, a novel magnetic circuit model incorporating a play model, which is one of the phenomenological models of magnetic hysteresis, was proposed. It was clear that the proposed model can calculate the hysteresis loop of the magnetic reactor with high-speed and high-accuracy. However, this method was applied only for the objects with simple shapes such as a ring core. Thus, it is necessary to extend the applicable range for devices with more complicated shapes such as electric motors. This paper describes that the play model is applied to reluctance network analysis (RNA) by using a permanent magnet (PM) motor as an object of discussion, in order to estimate the iron loss including magnetic hysteresis behavior.
{"title":"Reluctance Network Model of Permanent Magnet Synchronous Motor Considering Magnetic Hysteresis Behavior","authors":"Y. Hane","doi":"10.1109/INTMAG.2018.8508115","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508115","url":null,"abstract":"Quantitative analysis of iron loss taking magnetic hysteresis behavior into account is essential to development of high-efficiency electric machines. In a previous paper, a novel magnetic circuit model incorporating a play model, which is one of the phenomenological models of magnetic hysteresis, was proposed. It was clear that the proposed model can calculate the hysteresis loop of the magnetic reactor with high-speed and high-accuracy. However, this method was applied only for the objects with simple shapes such as a ring core. Thus, it is necessary to extend the applicable range for devices with more complicated shapes such as electric motors. This paper describes that the play model is applied to reluctance network analysis (RNA) by using a permanent magnet (PM) motor as an object of discussion, in order to estimate the iron loss including magnetic hysteresis behavior.","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"17 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":"87414934","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.2018.8508337
H. Kashiwagi, H. Asada, M. Iwasaka
Various aquatic animals have evolved their own particular systems for manipulating light to effect rapid color change, light concentration, optical cloaking, etc. utilizing a multilayered guanine crystal structure. This study focuses on the optical and magnetic properties of microscopic (approximately 1 μm) guanine crystals isolated from Sapphirina and scallop eyes. Crystals were suspended in an aqueous solution, and light reflecting properties and structural color were evaluated by real-time microscopic and spectroscopic analysis, with and without exposure to a 500 millitesla horizontal magnetic field. Diamagnetic anisotropic energy was also calculated. Results show that guanine crystals display significant light-reflection switching properties upon application of a magnetic field, regardless of the origin or size and shape of the crystals. Furthermore, it may be possible to devise a means for remote control of highly efficient microscopic light reflection and optical coloring utilizing the diamagnetic anisotropy of guanine crystals.
{"title":"Optical Behavior of Guanine Microcrystals from Aquatic Species upon Exposure to a Magnetic Field","authors":"H. Kashiwagi, H. Asada, M. Iwasaka","doi":"10.1109/INTMAG.2018.8508337","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508337","url":null,"abstract":"Various aquatic animals have evolved their own particular systems for manipulating light to effect rapid color change, light concentration, optical cloaking, etc. utilizing a multilayered guanine crystal structure. This study focuses on the optical and magnetic properties of microscopic (approximately 1 μm) guanine crystals isolated from Sapphirina and scallop eyes. Crystals were suspended in an aqueous solution, and light reflecting properties and structural color were evaluated by real-time microscopic and spectroscopic analysis, with and without exposure to a 500 millitesla horizontal magnetic field. Diamagnetic anisotropic energy was also calculated. Results show that guanine crystals display significant light-reflection switching properties upon application of a magnetic field, regardless of the origin or size and shape of the crystals. Furthermore, it may be possible to devise a means for remote control of highly efficient microscopic light reflection and optical coloring utilizing the diamagnetic anisotropy of guanine crystals.","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"7 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":"85614061","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.2018.8508176
H. Nakagawa, Takeru Sato, T. Todaka
This paper presents a new stator module type vernier motor, which is applicable amorphous magnetic material effectively as a stator core material. The iron loss distribution in the stator module structure made of a Fe-based amorphous material is numerically investigated with the finite element method and compared with those made of oriented electrical steel sheets and non-oriented electrical steel sheets in a wound core pattern. The results show that the proposed model is useful to improve significantly efficiency of the vernier motor model.
{"title":"Development of a New Stator Module Type Vernier Motor utilizing Amorphous Cut Core","authors":"H. Nakagawa, Takeru Sato, T. Todaka","doi":"10.1109/INTMAG.2018.8508176","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508176","url":null,"abstract":"This paper presents a new stator module type vernier motor, which is applicable amorphous magnetic material effectively as a stator core material. The iron loss distribution in the stator module structure made of a Fe-based amorphous material is numerically investigated with the finite element method and compared with those made of oriented electrical steel sheets and non-oriented electrical steel sheets in a wound core pattern. The results show that the proposed model is useful to improve significantly efficiency of the vernier motor model.","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"24 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":"84731932","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.2018.8508174
B. Reese, C. R. Sullivan
Abstract
摘要
{"title":"High Frequency Characterization of Magnetic Rod Cores with Anisotropic Power Loss.","authors":"B. Reese, C. R. Sullivan","doi":"10.1109/INTMAG.2018.8508174","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508174","url":null,"abstract":"Abstract","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"11 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":"84323566","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.2018.8508119
Z. Xiang, B. Gupta, M. Le, P. Cottinet, B. Ducharne
This paper reports a magnetic lump model of a 3D printed polymer matrix filled with magnetic particles. Due to the intrinsically dielectric nature of the polymer and since the percolation threshold is not reached even for a high percentage of particles, great resistivity is still achieved, confirming a significant limitation of the formation of the so-called “macroscopic” eddy currents. Taking into account this characteristics, the model investigated in this work essentially focuses on “microscopic” eddy currents that is mainly related to the movement of magnetic domain walls. The proposed approach is then validated based on experimental results and finite element method (FEM), followed by simulation/measurement comparisons over a wide excitation frequency band.
{"title":"Hysteresis Model of 3D Printed Magnetic Particles Based Polymer Composite Materials","authors":"Z. Xiang, B. Gupta, M. Le, P. Cottinet, B. Ducharne","doi":"10.1109/INTMAG.2018.8508119","DOIUrl":"https://doi.org/10.1109/INTMAG.2018.8508119","url":null,"abstract":"This paper reports a magnetic lump model of a 3D printed polymer matrix filled with magnetic particles. Due to the intrinsically dielectric nature of the polymer and since the percolation threshold is not reached even for a high percentage of particles, great resistivity is still achieved, confirming a significant limitation of the formation of the so-called “macroscopic” eddy currents. Taking into account this characteristics, the model investigated in this work essentially focuses on “microscopic” eddy currents that is mainly related to the movement of magnetic domain walls. The proposed approach is then validated based on experimental results and finite element method (FEM), followed by simulation/measurement comparisons over a wide excitation frequency band.","PeriodicalId":6571,"journal":{"name":"2018 IEEE International Magnetic Conference (INTERMAG)","volume":"10 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":"90960289","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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