Search results for: Masato Enokizono

Items from 1 to 20 out of 68 results

article

Evaluation of vector magnetic property in a three‐phase induction motor model core with visualization of streamline

Yuichiro Kai, Ryoya Maeda, Masato Enokizono

Electrical Engineering in Japan > 216 > 4 > n/a - n/a

In this paper, a streamline display method for magnetic flux density and magnetic field strength vectors in a three‐phase induction motor model core is presented, and the relationship between streamlines and magnetic properties is investigated. It is possible to visualize the vector magnetic properties distribution by representing the magnetic flux density and the magnetic field strength vector with...

article

Vector Magnetic Characteristics of Ultra-Thin Electrical Steel Sheet for Development of High-Efficiency High-Speed Motor

Shohei Ueno, Masato Enokizono, Yuji Mori, Kazumasa Yamazaki

IEEE Transactions on Magnetics > 2017 > 53 > 11 > 1 - 4

This paper presents measured results of the 2-D vector magnetic characteristics of ultra-thin electrical steel sheets for high-efficiency high-speed motors. Generally, Non-oriented electrical steel sheets with 0.2–0.5 mm of thickness are used for motor cores. However, their thicknesses are not appropriate to use for cores of high-speed motors. We newly developed “Ultra-thin electrical steel sheet”...

article

Stator Shape Design Method for Improving Power Density in PM Motor

Naoya Soda, Masato Enokizono

IEEE Transactions on Magnetics > 2017 > 53 > 11 > 1 - 4

In this paper, we propose a stator shape design method for improving power density in a small permanent magnet motor. In order to calculate iron loss correctly, we analyze a motor by using 2-D finite element method (FEM) in which an E&S model is introduced. Moreover, external circuit equations are solved coupled with equations in electromagnetic field by FEM to calculate copper loss correctly...

article

Effect of Arbitrary Shear Stress on Vector Magnetic Properties of Non-Oriented Electrical Steel Sheets

Yuichiro Kai, Masato Enokizono

IEEE Transactions on Magnetics > 2017 > 53 > 11 > 1 - 4

The magnetic properties of electrical steel sheets, which are used as core materials in numerous electric-powered machines, tend to deteriorate due to residual stress and external loads during manufacturing processes. Previously, we reported our measurement results for the residual stress distribution in a motor core and clarified that sheer stress, along with tensile and compressive stress, exists...

article

Reduction of Iron Loss on Laminated Electrical Steel Sheet Cores by Means of Secondary Current Heating Method

Yuji Tsuchida, Naoyuki Yoshino, Masato Enokizono

IEEE Transactions on Magnetics > 2017 > 53 > 11 > 1 - 4

This paper presents the newly proposed heating method named “secondary current heating method” to reduce the iron loss on laminated electrical steel sheet cores for high-efficiency electrical motors. It is well known that the magnetic properties of electrical steel sheets, which are used for electrical motor cores, are deteriorated by the residual stress during manufacturing of the electrical motors,...

chapter

Utilization method of electrical steel sheets on stator of self-propelled rotary actuator

Naoya Soda, Masato Enokizono

2016 XXII International Conference on Electrical Machines (ICEM) > 918 - 923

2016 XXII International Conference on Electrical Machines (ICEM)

We consider the improvement of the stator structure of self-propelled rotary actuator whose rotational axis is parallel to the exciting magnetic field. The stator of the actuator is constructed from the grain-oriented electrical steel sheet. The relation between the rolling direction of the steel sheet and the direction of the exciting magnetic field is important for the starting torque and rotational...

chapter

How to decrease magnetic power loss for development of high efficiency electric machines

Masato Enokizono

2016 19th International Symposium on Electrical Apparatus and Technologies (SIELA) > 1 - 7

2016 19th International Symposium on Electrical Apparatus and Technologies (SIELA)

This paper describes about the core loss (magnetic power loss, iron loss) reduction method for upgrading high efficiency motor. It is difficult to achieve the core loss reduction of motor by using conventional technique. Therefore we proposed the vector magnetic characteristic technology which is constructed magnetic characteristic analytical method, evaluation method of magnetic materials, and the...

article

Magnetic Field Analysis of Self-Propelled Rotary Actuator’s Stator in Consideration of the Rolling Direction of the Steel Sheet

Naoya Soda, Masato Enokizono

IEEE Transactions on Magnetics > 2016 > 52 > 3 > 1 - 4

In this paper, we consider the improvement of the stator structure of the self-propelled rotary actuator, whose rotational axis is parallel to the exciting magnetic field. The stator of the actuator is constructed from the grain-oriented electrical steel sheet. The relation between the rolling direction of the steel sheet and the direction of the exciting magnetic field is important for the starting...

chapter

Nondestructive Evaluations of Iron-Based Materials by Using AC and DC Electromagnetic Sensors

Koji Yamada, Jiaoliang Luo, Masato Enokizono

Lecture Notes in Electrical Engineering > New Developments and Applications in Sensing Technology > 293-303

Sensitive and precision nondestructive evaluations of iron-based material have been investigated by observing the magnetoresistance effects, magnetic Barkhausen noises, conductivity and magnetic susceptibility. The magneto-resistance was found very small as 0.04% or less for the samples with residual strain of 10% in the stainless steel of SUS304, caused by the martensitic transformation up to 60emu/g...

article

Vector Magnetic Characteristic Analysis of a Permanent Magnet Motor by Controlling Local Stress

Yuichiro Kai, Yuji Tsuchida, Masato Enokizono

IEEE Transactions on Magnetics > 2015 > 51 > 3 > 1 - 4

We have reported the measured results for the magnetic properties of a non-oriented electrical steel sheet under various magnetic flux and stress conditions and proposed a new vector magnetic characteristic analysis technique to consider the stress effect on the motor core. In this paper, the stress effect on the magnetic flux density vector, magnetic field strength vector, and magnetic power loss...

article

Measurement of Vector Magnetic Properties of a Nonoriented Electrical Steel Sheet under Shear Stress

Yuichiro Kai, Masato Enokizono, Yukihito Kido

Electrical Engineering in Japan > 191 > 4 > 1 - 7

It is well known that the magnetic properties of electrical steel sheets are influenced strongly by mechanical stress. We have measured the residual stress distribution with an X‐ray stress measurement device and clarified not only the tensile and compressive stress but also the shear stress in a rotating machine core. In particular, the influence of the shear stress on the magnetic properties has...

article

Phase Correction for High Precision Measurement of Iron Loss Using H‐coil Method

Akifumi Kutsukake, Yukihito Kido, Tetsu Ikeda, Tsugunori Kanada, more

Electrical Engineering in Japan > 190 > 4 > 1 - 10

The accurate magnetic properties of electrical steel sheets are important for the development of high‐efficiency electromagnetic devices. In particular, the H‐coil method is a useful technique for accurately measuring magnetic field strength in a single sheet tester. Therefore, we developed a tester for magnetic field properties using the H‐coil method, referred to as the stress load type single sheet...

chapter

Study on the development of the surface magnet type magnetic gear

Masaru Oka, Masato Enokizono

2014 International Conference on Electrical Machines (ICEM) > 1437 - 1440

2014 XXI International Conference on Electrical Machines (ICEM)

Magnetic gears are a force transmitter consisting of permanent magnets. The transmission torque properties have been improved by using the rare earth magnets and the computer aided design techniques. However, in the analysis and experimental results is that there is a big difference has been reported. As one of the causes, in the analysis is considered that the actual movement of the magnetic gear...

chapter

Low loss of a permanent magnet motor by applying local stress

Yuichiro Kai, Masato Enokizono

2014 International Conference on Electrical Machines (ICEM) > 215 - 220

2014 XXI International Conference on Electrical Machines (ICEM)

We have been reported measured results for magnetic properties of a non-oriented electrical steel sheet under various magnetic flux and stress conditions and a new vector magnetic characteristic analysis technique in order to consider the stress effect on magnetic properties in the motor core. Next, we try to control the vector magnetic properties of non-oriented electrical steel sheets by applying...

article

Control of Rotating Magnetic Flux Distribution in a Transformer Model Core by Laser Irradiation

Keiichiro Ooka, Toshiya Kajiwara, Shigeru Aihara, Masato Enokizono

IEEE Transactions on Magnetics > 2014 > 50 > 4-1 > 1 - 4

To reduce power loss of transformers further from now on and to raise efficiency, we have measured magnetic property distributions in a three-phase tripod V-connection transformer model core. For the measurement, we have developed a localized vector magnetic property measurement system consisting of a three-axis positioning system, a vector magnetic sensor (V–H sensor), and PC. The measured results...

article

Vector Magnetic Properties and 2-D Magnetostriction of Various Electrical Steel Sheets Under Rotating Flux Condition

Masayuki Yamagashira, Daisuke Wakabayashi, Masato Enokizono

IEEE Transactions on Magnetics > 2014 > 50 > 4-1 > 1 - 4

In electrical equipment, such as transformers and motors, rotating magnetic fluxes occur at T-joint parts and back yoke parts. It is therefore necessary to understand the magnetic properties and magnetostrictions under several rotating flux conditions. This paper presents measured vector magnetic properties including 2-D magnetostriction of a nonoriented electrical steel sheet (including a 6.5%SiFe...

article

Magnetic Properties of Bilayer Ferromagnetic Shape Memory Ribbons

Nobuhiro Sakoh, Takashi Todaka, Masato Enokizono

IEEE Transactions on Magnetics > 2014 > 50 > 4-1 > 1 - 4

Recently, progress of intelligent materials has played a big role in the development of science and technology. We have tried to develop ferromagnetic shape memory alloys to expand application range of the nonmagnetic shape memory alloys, which are typical intelligent material. However, we have not yet obtained a sufficient result, because the magnetic property and the shape memory effect (SME) are...

article

A New Electrical Steel Sheet Developed by Vector Magnetic Characteristic Control

Toshiya Kajiwara, Keiichiro Ooka, Masato Enokizono

IEEE Transactions on Magnetics > 2014 > 50 > 11 > 1 - 4

It is assumed that vectors of magnetic flux density

$B$

(

$B$

-vector) and magnetic field strength

$H$

(

$H$

-vector) are parallel in the standard magnetic measurement; however, they are not parallel in actual electrical steel sheets. We have proposed the 2-D vector magnetic measurement technique which can measure the

$B$

-vector and

$H$

-vector that are in different directions. There is a phase...

article

Estimation of Suppressed Iron Loss by Stress-Relief Annealing in an Actual Induction Motor Stator Core by Using the Excitation Inner Core Method

Mohachiro Oka, Takato Ogasawara, Namiko Kawano, Masato Enokizono

IEEE Transactions on Magnetics > 2014 > 50 > 11 > 1 - 4

It is well known that magnetic properties, such as iron loss of a stator core in a rotating machine like an induction motor, are strongly influenced by residual stress caused by manufacturing processes. In particular, both the residual stress that was generated by the punching and the laminating process greatly influence the iron loss. However, it is not easy to evaluate the magnetic properties of...

article

Complex-Variable Vector Magnetic Characteristic Analysis Considering Residual Stress Effect

Shingo Zeze, Yuichiro Kai, Takashi Todaka, Masato Enokizono

IEEE Transactions on Magnetics > 2014 > 50 > 2 > 337 - 340

This paper presents a modeling of vector magnetic properties considering residual stress effects in electrical steel sheets. Because the practical phenomenon is too complicated, complex variable expressions are applied to the modeling used in the characteristic analysis with the FEM. We call this stress-complex-E&S modeling. The validity of the developed modeling was verified in comparison with...

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MAGNETIC PROPERTIES (14)
STEEL (11)
VECTOR MAGNETIC PROPERTY (11)
IRON (10)
MAGNETIC FLUX (10)
IRON LOSS (9)
MAGNETIC CORES (9)
FINITE ELEMENT METHOD (8)
SATURATION MAGNETIZATION (8)
MAGNETIC POWER LOSS (6)
MAGNETOSTRICTION (6)
MAGNETIC HYSTERESIS (5)
STRESS (5)
TWO-DIMENSIONAL VECTOR MAGNETIC PROPERTY (5)
VECTOR MAGNETIC PROPERTIES (5)
VECTORS (5)
FERROMAGNETIC SHAPE MEMORY ALLOY (4)
MAGNETIC DOMAINS (4)
MAGNETIC FLUX DENSITY (4)
PERPENDICULAR MAGNETIC ANISOTROPY (4)
RESIDUAL STRESS (4)
STATORS (4)
TEMPERATURE MEASUREMENT (4)
ANALYTICAL MODELS (3)
COILS (3)
CURIE POINT (3)
CURIE TEMPERATURE (3)
E&S MODELING (3)
FEM (3)
FINITE ELEMENT ANALYSIS (3)
HIGH EFFICIENCY MOTOR (3)
LOSS MEASUREMENT (3)
MAGNETIC ANISOTROPY (3)
MAGNETIC FIELDS (3)
MAGNETIZATION (3)
MAGNETOMECHANICAL EFFECTS (3)
NONORIENTED ELECTRICAL STEEL SHEET (3)
NUMERICAL ANALYSIS (3)
ROTORS (3)
STATOR CORES (3)
TORQUE (3)
ACTUATOR (2)
ANISOTROPY (2)
COMPLEX VARIABLE APPROXIMATION (2)
CORE LOSS (2)
E&S MODEL (2)
EDDY CURRENT (2)
ELECTRICAL MACHINES (2)
GRAIN-ORIENTED ELECTRICAL STEEL (2)
H-COIL (2)
HARMONIC COMPONENT (2)
HIGH DENSITY (2)
HYSTERESIS (2)
HYSTERESIS MODELING (2)
HYSTERESIS MOTORS (2)
INDUCTION MOTOR (2)
INDUCTION MOTORS (2)
MAGNETIC CHARACTERISTIC ANALYSIS (2)
MAGNETIC LOSSES (2)
MAGNETIC PROPERTY (2)
MEASUREMENT BY LASER BEAM (2)
MECHANICAL STRESS (2)
NON-ORIENTED ELECTRICAL STEEL SHEET (2)
ROLLING DIRECTION (2)
SHAPE (2)
SHAPE MEMORY EFFECT (2)
SHAPE-MEMORY EFFECT (2)
SHEAR STRESS (2)
TWO‐DIMENSIONAL VECTOR MAGNETIC PROPERTIES (2)
VECTOR MAGNETIC CHARACTERISTIC (2)
2-D MAGNETIC PROPERTY (1)
2D VECTOR MAGNETIC PROPERTY (1)
6.5%SI–FE ALLOYS (1)
ACTUATORS (1)
ALTERNATING MAGNETIC FLUX CONDITION (1)
ALUMINUM (1)
AMORPHOUS MAGNETIC MATERIAL (1)
AMORPHOUS MAGNETIC MATERIALS (1)
ANNEALING (1)
ARC-TANGENT FUNCTION (1)
ARGON (1)
ATMOSPHERE (1)
ATMOSPHERIC MEASUREMENTS (1)
ATTENUATION (1)
ATTENUATION MEASUREMENT (1)
ATTENUATORS (1)
AUSTENITE FINISH POINT (1)
AUSTENITE TRANSFORMATION POINTS (1)
B-COIL (1)
BORON (1)
CAPACITORS (1)
CAULKING (1)
CCW/CW PROBLEM (1)
COERCIVE FORCE (1)
COERCIVITY MEASUREMENTS (1)
COMPLEX APPROXIMATION METHOD (1)
COMPLEX E&S MODELING (1)
COMPRESSIVE STRESS (1)
COPPER (1)
COPPER LOSS (1)
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INFONA - science communication portal

Search results for: Masato Enokizono

Evaluation of vector magnetic property in a three‐phase induction motor model core with visualization of streamline

Vector Magnetic Characteristics of Ultra-Thin Electrical Steel Sheet for Development of High-Efficiency High-Speed Motor

Stator Shape Design Method for Improving Power Density in PM Motor

Effect of Arbitrary Shear Stress on Vector Magnetic Properties of Non-Oriented Electrical Steel Sheets

Reduction of Iron Loss on Laminated Electrical Steel Sheet Cores by Means of Secondary Current Heating Method

Utilization method of electrical steel sheets on stator of self-propelled rotary actuator

How to decrease magnetic power loss for development of high efficiency electric machines

Magnetic Field Analysis of Self-Propelled Rotary Actuator’s Stator in Consideration of the Rolling Direction of the Steel Sheet

Nondestructive Evaluations of Iron-Based Materials by Using AC and DC Electromagnetic Sensors

Vector Magnetic Characteristic Analysis of a Permanent Magnet Motor by Controlling Local Stress

Measurement of Vector Magnetic Properties of a Nonoriented Electrical Steel Sheet under Shear Stress

Phase Correction for High Precision Measurement of Iron Loss Using H‐coil Method

Study on the development of the surface magnet type magnetic gear

Low loss of a permanent magnet motor by applying local stress

Control of Rotating Magnetic Flux Distribution in a Transformer Model Core by Laser Irradiation

Vector Magnetic Properties and 2-D Magnetostriction of Various Electrical Steel Sheets Under Rotating Flux Condition

Magnetic Properties of Bilayer Ferromagnetic Shape Memory Ribbons

A New Electrical Steel Sheet Developed by Vector Magnetic Characteristic Control

Estimation of Suppressed Iron Loss by Stress-Relief Annealing in an Actual Induction Motor Stator Core by Using the Excitation Inner Core Method

Complex-Variable Vector Magnetic Characteristic Analysis Considering Residual Stress Effect

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