Pub Date : 1994-11-01DOI: 10.1109/TJMJ.1994.4565979
K. Kusumi;H. Miyajima;Y. Otani
Fe 100-x N x thin films were prepared by RF sputtering in nitrogen with a low plasma density. All films had compositions in the range 0≤x≤35 at% and consisted of a single metastable phase with a body-centered cubic structure. The saturation magnetization seemed to follow the Slater-Pauling curve with respect to the nitrogen concentration. In the films, the Fe atoms that were nearest-neighbors to nitrogen atoms were found to behave like Co atoms.
{"title":"Compositional Variation of Saturation Magnetization for Fe-N Thin Films with Respect to Nitrogen","authors":"K. Kusumi;H. Miyajima;Y. Otani","doi":"10.1109/TJMJ.1994.4565979","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565979","url":null,"abstract":"Fe\u0000<sub>100-x</sub>\u0000N\u0000<sub>x</sub>\u0000 thin films were prepared by RF sputtering in nitrogen with a low plasma density. All films had compositions in the range 0≤x≤35 at% and consisted of a single metastable phase with a body-centered cubic structure. The saturation magnetization seemed to follow the Slater-Pauling curve with respect to the nitrogen concentration. In the films, the Fe atoms that were nearest-neighbors to nitrogen atoms were found to behave like Co atoms.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 6","pages":"191-196"},"PeriodicalIF":0.0,"publicationDate":"1994-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565979","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67872981","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 : 1994-11-01DOI: 10.1109/TJMJ.1994.4565968
N. Nishizawa;T. Ishii;H. Yamada
Milking with a conventional milking machine often involves teat trouble, because the pulsation rate of the milking is not variable. A new cylindrical linear oscillatory actuator (CLOA) developed by the authors has a freely variable pulsation rate. This paper analyzes the static and kinetic thrusts of the CLOA. The mover of the CLOA is capable of oscillation at a frequency of 1 Hz with a stroke of ±2 mm, and will be used in new milking machines.
{"title":"Performance Analysis of a Linear Oscillatory Actuator for a Milking Unit","authors":"N. Nishizawa;T. Ishii;H. Yamada","doi":"10.1109/TJMJ.1994.4565968","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565968","url":null,"abstract":"Milking with a conventional milking machine often involves teat trouble, because the pulsation rate of the milking is not variable. A new cylindrical linear oscillatory actuator (CLOA) developed by the authors has a freely variable pulsation rate. This paper analyzes the static and kinetic thrusts of the CLOA. The mover of the CLOA is capable of oscillation at a frequency of 1 Hz with a stroke of ±2 mm, and will be used in new milking machines.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 6","pages":"122-126"},"PeriodicalIF":0.0,"publicationDate":"1994-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565968","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67873544","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 : 1994-11-01DOI: 10.1109/TJMJ.1994.4565984
H. Yamamoto;T. Kumanbara;T. Kojima;K. Tomii
Experiments were carried out to investigate the magnetic and physical properties of (Sm 1-x Nd x ) 2 (Fe 0.8 Co 0.2 ) 17 N y (x=0 to 0.5) in which the value of y is 3. The anisotropy field (H A ) in (Sm 1-x Nd x ) 2 (Fe 0.8 Co 0.2 ) 17 N y compounds decreased linearly with increasing x, while the saturation magnetization (J s ) increased. It was found that the H A and J s of a (Sm 0.9 Nd 0.1 ) 2 (Fe 0.8 Co 0.2 ) 17 N 3.07 compound were 10.4 MA/m and 193.6×10 -6 Wb-m/kg respectively. Anisotropic epoxy-bonded magnets were prepared from (Sm 0.9 Nd 0.1 ) 2 (Fe 0.8 Co 0.2 ) 17 N 3.07 powder with particle size ranging from 3 to 5 μm by a compression molding process. The magnetic properties of a typical bonded magnet were (BH) max =101.8 kJ/m 3 , J r =0.89 T, H cJ =394 kA/m, and H cB =314 kA/m. Magnetization jumps were observed on the hysteresis loop of a bonded magnet at 7K.
{"title":"Magnetic Properties of Sm-Nd-Fe-Co-N Compounds and Their Bonded Magnets","authors":"H. Yamamoto;T. Kumanbara;T. Kojima;K. Tomii","doi":"10.1109/TJMJ.1994.4565984","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565984","url":null,"abstract":"Experiments were carried out to investigate the magnetic and physical properties of (Sm\u0000<sub>1-x</sub>\u0000Nd\u0000<sub>x</sub>\u0000)\u0000<sub>2</sub>\u0000(Fe\u0000<sub>0.8</sub>\u0000Co\u0000<sub>0.2</sub>\u0000)\u0000<sub>17</sub>\u0000N\u0000<sub>y</sub>\u0000 (x=0 to 0.5) in which the value of y is 3. The anisotropy field (H\u0000<sub>A</sub>\u0000) in (Sm\u0000<sub>1-x</sub>\u0000Nd\u0000<sub>x</sub>\u0000)\u0000<sub>2</sub>\u0000(Fe\u0000<sub>0.8</sub>\u0000Co\u0000<sub>0.2</sub>\u0000)\u0000<sub>17</sub>\u0000N\u0000<sub>y</sub>\u0000 compounds decreased linearly with increasing x, while the saturation magnetization (J\u0000<sub>s</sub>\u0000) increased. It was found that the H\u0000<sub>A</sub>\u0000 and J\u0000<sub>s</sub>\u0000 of a (Sm\u0000<sub>0.9</sub>\u0000Nd\u0000<sub>0.1</sub>\u0000)\u0000<sub>2</sub>\u0000(Fe\u0000<sub>0.8</sub>\u0000Co\u0000<sub>0.2</sub>\u0000)\u0000<sub>17</sub>\u0000N\u0000<sub>3.07</sub>\u0000 compound were 10.4 MA/m and 193.6×10\u0000<sup>-6</sup>\u0000 Wb-m/kg respectively. Anisotropic epoxy-bonded magnets were prepared from (Sm\u0000<sub>0.9</sub>\u0000Nd\u0000<sub>0.1</sub>\u0000)\u0000<sub>2</sub>\u0000(Fe\u0000<sub>0.8</sub>\u0000Co\u0000<sub>0.2</sub>\u0000)\u0000<sub>17</sub>\u0000N\u0000<sub>3.07</sub>\u0000 powder with particle size ranging from 3 to 5 μm by a compression molding process. The magnetic properties of a typical bonded magnet were (BH)\u0000<sub>max</sub>\u0000=101.8 kJ/m\u0000<sup>3</sup>\u0000, J\u0000<sub>r</sub>\u0000=0.89 T, H\u0000<sub>cJ</sub>\u0000=394 kA/m, and H\u0000<sub>cB</sub>\u0000=314 kA/m. Magnetization jumps were observed on the hysteresis loop of a bonded magnet at 7K.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 6","pages":"223-230"},"PeriodicalIF":0.0,"publicationDate":"1994-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565984","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68041813","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 : 1994-11-01DOI: 10.1109/TJMJ.1994.4565967
H. Yamada;S. Kihara;M. Yamaguchi;H. Nakagawa;K. Hagiwara
A linear proportional solenoid (LPS) is an actuator for a proportional control valve used in hydraulic pressure-control devices. The LPS thrust must be constant over a specified displacement range, and must be proportional to the current. This paper describes simulations of the thrust-displacement characteristics of LPSes as determined by FEM, conducted with the aim of improving the LPM thrust. In model P, where high flux-density permendur was used in the LPS stator and mover, the maximum thrust increased from 27 to 40 N. The range of constant thrust, however, decreased from 1.0 to 0.5 mm. In model S, where permendur was used in the stator and mover, and the salient pole of the stator in the LPS was modified, the range of constant thrust was the same as in the present model. Moreover, the static thrust in the range of constant thrust increased from 27 to 38 N.
{"title":"Static Thrust Improvement of a Linear Proportional Solenoid","authors":"H. Yamada;S. Kihara;M. Yamaguchi;H. Nakagawa;K. Hagiwara","doi":"10.1109/TJMJ.1994.4565967","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565967","url":null,"abstract":"A linear proportional solenoid (LPS) is an actuator for a proportional control valve used in hydraulic pressure-control devices. The LPS thrust must be constant over a specified displacement range, and must be proportional to the current. This paper describes simulations of the thrust-displacement characteristics of LPSes as determined by FEM, conducted with the aim of improving the LPM thrust. In model P, where high flux-density permendur was used in the LPS stator and mover, the maximum thrust increased from 27 to 40 N. The range of constant thrust, however, decreased from 1.0 to 0.5 mm. In model S, where permendur was used in the stator and mover, and the salient pole of the stator in the LPS was modified, the range of constant thrust was the same as in the present model. Moreover, the static thrust in the range of constant thrust increased from 27 to 38 N.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 6","pages":"117-121"},"PeriodicalIF":0.0,"publicationDate":"1994-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565967","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68041822","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 : 1994-11-01DOI: 10.1109/TJMJ.1994.4565980
M. Ishida;T. Kawase;H. Miyazawa;T. Katsuyama;S. Nebashi;T. Shimoda
The effect of adding Nd to an RE-TM film on the disk's magnetooptic and read/write properties was investigated. It was found that as the amount of Nd was increased, the C/N ratio at a wavelength of 532 nm was improved. In spite of an increase in the Kerr rotation angle, the carrier level was not significantly improved. This fact can be explained by the disk's magnetooptic characteristics, as a result of which the Kerr ellipticity angle decrease in the short-wavelength region as the Nd content was increased. Thus the value of the figure of merit was not improved. The improvement in C/N ratio was due to a decrease in the noise level.
{"title":"Read/Write Properties of Nd-RE-TM Films in the Short-Wavelength Region","authors":"M. Ishida;T. Kawase;H. Miyazawa;T. Katsuyama;S. Nebashi;T. Shimoda","doi":"10.1109/TJMJ.1994.4565980","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565980","url":null,"abstract":"The effect of adding Nd to an RE-TM film on the disk's magnetooptic and read/write properties was investigated. It was found that as the amount of Nd was increased, the C/N ratio at a wavelength of 532 nm was improved. In spite of an increase in the Kerr rotation angle, the carrier level was not significantly improved. This fact can be explained by the disk's magnetooptic characteristics, as a result of which the Kerr ellipticity angle decrease in the short-wavelength region as the Nd content was increased. Thus the value of the figure of merit was not improved. The improvement in C/N ratio was due to a decrease in the noise level.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 6","pages":"197-201"},"PeriodicalIF":0.0,"publicationDate":"1994-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565980","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67872980","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 : 1994-11-01DOI: 10.1109/TJMJ.1994.4565969
K. Ishikawa;S. Kikuchi;O. Ichinokura;T. Watanabe;K. Murakami
This paper describes two methods for the directional control of a linear parametric motor. The first uses a circuit-changing switch. The direction of this linear parametric motor can be controlled by exchanging the power supply circuit and tuning the capacitor circuit. In the second method, which we call separately excited control, the linear motor has two power supplies, and the velocity or direction of the mover can be easily controlled by regulating the primary voltage phase difference. The experimentally ascertained features of these two methods are described.
{"title":"Some Considerations on the Directional Control of a Linear Parametric Motor","authors":"K. Ishikawa;S. Kikuchi;O. Ichinokura;T. Watanabe;K. Murakami","doi":"10.1109/TJMJ.1994.4565969","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565969","url":null,"abstract":"This paper describes two methods for the directional control of a linear parametric motor. The first uses a circuit-changing switch. The direction of this linear parametric motor can be controlled by exchanging the power supply circuit and tuning the capacitor circuit. In the second method, which we call separately excited control, the linear motor has two power supplies, and the velocity or direction of the mover can be easily controlled by regulating the primary voltage phase difference. The experimentally ascertained features of these two methods are described.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 6","pages":"127-131"},"PeriodicalIF":0.0,"publicationDate":"1994-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565969","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68041820","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}
An intra-aortic balloon pump (IABP) is an effective device for supporting circulation in the event of acute heart failure. Small IABP devices are in urgent demand in medical fields. The authors have investigated an IABP device which uses a linear pulse motor (LPM) in order to reduce the device size. This paper discusses the characteristics of the LPM developed by the authors to drive the IABP, and describes the results of evaluation of an LPM-driven IABP. Our investigation revealed the following. (1) The trial LPM was 1.3 L in volume and had a mass of 6.3 kg. Its use will reduce the weight of IABP devices. (2) The LPM has a high thrust/volume ratio of 0.88 N/ml. (3) The driving characteristic of the LPM-driven IABP was evaluated using a mock testing device. The maximum pumping rate of this IABP device is approximately 120 beats/min. As a result, an LPM-driven IABP will be capable of sufficiently high performance to enable clinical use.
{"title":"Performance Evaluation of a Linear Pulse Motor-Driven Intra-Aortic Balloon Pump","authors":"K. Kobayashi, K. Suzuki, H. Nakagawa, H. Yamada","doi":"10.3379/JMSJMAG.18.525","DOIUrl":"https://doi.org/10.3379/JMSJMAG.18.525","url":null,"abstract":"An intra-aortic balloon pump (IABP) is an effective device for supporting circulation in the event of acute heart failure. Small IABP devices are in urgent demand in medical fields. The authors have investigated an IABP device which uses a linear pulse motor (LPM) in order to reduce the device size. This paper discusses the characteristics of the LPM developed by the authors to drive the IABP, and describes the results of evaluation of an LPM-driven IABP. Our investigation revealed the following. (1) The trial LPM was 1.3 L in volume and had a mass of 6.3 kg. Its use will reduce the weight of IABP devices. (2) The LPM has a high thrust/volume ratio of 0.88 N/ml. (3) The driving characteristic of the LPM-driven IABP was evaluated using a mock testing device. The maximum pumping rate of this IABP device is approximately 120 beats/min. As a result, an LPM-driven IABP will be capable of sufficiently high performance to enable clinical use.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"-3 1","pages":"98-103"},"PeriodicalIF":0.0,"publicationDate":"1994-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79312969","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 : 1994-11-01DOI: 10.1109/TJMJ.1994.4565955
Y. Ueda;S. Ikeda;T. Sakaguchi
The soft magnetic properties of amorphous Fe-Si-B-Cu-Nb alloys are markedly improved by annealing the alloys above the crystallization temperature. The magnetic permeability of the annealed Fe 74 Si x B 22-x Cu 1 Nb 3 alloys shows a maximum value at an Si concentration of x=14. The precipitation of μ-Fe grains is observed for the annealing temperature giving the highest magnetic permeability. The lattice constant of the α-Fe phase shows a minimum at the annealing temperature yielding the highest magnetic permeability, and depends strongly on the Si concentration. The Si content in the μ-Fe phase estimated from the lattice constant is about 20 at% for Si concentrations above x=12. The volume fraction of the precipitated μ-Fe phase depends on the B concentration in the amorphous alloy. The grain size of μ-Fe at the optimum annealing temperature is about 130Å. To explain the mechanism of the high permeability, it is necessary to consider factors other than the grain size the volume fraction of the precipitated μ-Fe.
{"title":"Permeability and α-Fe Phase Precipitated in Fe-Si-B-Cu-Nb Amorphous Alloys","authors":"Y. Ueda;S. Ikeda;T. Sakaguchi","doi":"10.1109/TJMJ.1994.4565955","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565955","url":null,"abstract":"The soft magnetic properties of amorphous Fe-Si-B-Cu-Nb alloys are markedly improved by annealing the alloys above the crystallization temperature. The magnetic permeability of the annealed Fe\u0000<inf>74</inf>\u0000Si\u0000<inf>x</inf>\u0000B\u0000<inf>22-x</inf>\u0000Cu\u0000<inf>1</inf>\u0000Nb\u0000<inf>3</inf>\u0000 alloys shows a maximum value at an Si concentration of x=14. The precipitation of μ-Fe grains is observed for the annealing temperature giving the highest magnetic permeability. The lattice constant of the α-Fe phase shows a minimum at the annealing temperature yielding the highest magnetic permeability, and depends strongly on the Si concentration. The Si content in the μ-Fe phase estimated from the lattice constant is about 20 at% for Si concentrations above x=12. The volume fraction of the precipitated μ-Fe phase depends on the B concentration in the amorphous alloy. The grain size of μ-Fe at the optimum annealing temperature is about 130Å. To explain the mechanism of the high permeability, it is necessary to consider factors other than the grain size the volume fraction of the precipitated μ-Fe.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 6","pages":"39-46"},"PeriodicalIF":0.0,"publicationDate":"1994-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565955","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67873537","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 : 1994-11-01DOI: 10.1109/TJMJ.1994.4565964
K. Kobayashi;K. Suzuki;H. Nakagawa;H. Yamada
An intra-aortic balloon pump (IABP) is an effective device for supporting circulation in the event of acute heart failure. Small IABP devices are in urgent demand in medical fields. The authors have investigated an IABP device which uses a linear pulse motor (LPM) in order to reduce the device size. This paper discusses the characteristics of the LPM developed by the authors to drive the IABP, and describes the results of evaluation of an LPM-driven IABP. Our investigation revealed the following. (1) The trial LPM was 1.3 L in volume and had a mass of 6.3 kg. Its use will reduce the weight of IABP devices. (2) The LPM has a high thrust/volume ratio of 0.88 N/ml. (3) The driving characteristic of the LPM-driven IABP was evaluated using a mock testing device. The maximum pumping rate of this IABP device is approximately 120 beats/min. As a result, an LPM-driven IABP will be capable of sufficiently high performance to enable clinical use.
{"title":"Performance Evaluation of a Linear Pulse Motor-Driven Intra-Aortic Balloon Pump","authors":"K. Kobayashi;K. Suzuki;H. Nakagawa;H. Yamada","doi":"10.1109/TJMJ.1994.4565964","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565964","url":null,"abstract":"An intra-aortic balloon pump (IABP) is an effective device for supporting circulation in the event of acute heart failure. Small IABP devices are in urgent demand in medical fields. The authors have investigated an IABP device which uses a linear pulse motor (LPM) in order to reduce the device size. This paper discusses the characteristics of the LPM developed by the authors to drive the IABP, and describes the results of evaluation of an LPM-driven IABP. Our investigation revealed the following. (1) The trial LPM was 1.3 L in volume and had a mass of 6.3 kg. Its use will reduce the weight of IABP devices. (2) The LPM has a high thrust/volume ratio of 0.88 N/ml. (3) The driving characteristic of the LPM-driven IABP was evaluated using a mock testing device. The maximum pumping rate of this IABP device is approximately 120 beats/min. As a result, an LPM-driven IABP will be capable of sufficiently high performance to enable clinical use.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 6","pages":"98-103"},"PeriodicalIF":0.0,"publicationDate":"1994-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565964","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67873545","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 : 1994-11-01DOI: 10.1109/TJMJ.1994.4565966
C. Kaido
An induction voice coil motor (VCM) is composed of a moving metal ring, permanent magnets, cores and exciting coils. The moving ring current induced by an exciting coil current, and the magnetic flux of the permanent magnets, generate a driving force acting on the moving ring. The induction VCM is not able to generate forces below the lower cutoff frequency or above the higher cutoff frequency. The lower cutoff frequency is lowered by raising the permeability and lowering the hysteresis loss of the core; the higher cutoff frequency is raised by reducing core eddy current losses and lowering the leakage inductance of the moving ring. There is an electromechanical parallel resonance near the lower cutoff frequency, and the higher permeability and lower loss make the resonance stronger and lowers the resonance frequency.
{"title":"Effects of Cores on the Characteristics of an Induction VCM","authors":"C. Kaido","doi":"10.1109/TJMJ.1994.4565966","DOIUrl":"https://doi.org/10.1109/TJMJ.1994.4565966","url":null,"abstract":"An induction voice coil motor (VCM) is composed of a moving metal ring, permanent magnets, cores and exciting coils. The moving ring current induced by an exciting coil current, and the magnetic flux of the permanent magnets, generate a driving force acting on the moving ring. The induction VCM is not able to generate forces below the lower cutoff frequency or above the higher cutoff frequency. The lower cutoff frequency is lowered by raising the permeability and lowering the hysteresis loss of the core; the higher cutoff frequency is raised by reducing core eddy current losses and lowering the leakage inductance of the moving ring. There is an electromechanical parallel resonance near the lower cutoff frequency, and the higher permeability and lower loss make the resonance stronger and lowers the resonance frequency.","PeriodicalId":100647,"journal":{"name":"IEEE Translation Journal on Magnetics in Japan","volume":"9 6","pages":"110-116"},"PeriodicalIF":0.0,"publicationDate":"1994-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/TJMJ.1994.4565966","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67873546","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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