JMAG User Conference

	Trial Version
	Video Tutorials

Last November, in Japon, the JMAG Users Conference gathered more than 300 people working in the mechatronic field. You will find below the list of subjects covered during the conference.
	Well-Developed Numerical Techniques and Future Expectation for Magnetic Field Computation Mr. Koji Fujiwara, Doshisha University It seems that evaluation schemes for various machines and devices were fairly improved in recent approximately one decade because of the much progress of both numerical calculation theory and computer environment. In the analysis of rotating machines, for example, the effect of the skew on the operating characteristics can be solved three-dimensionally. Even the deterioration of magnetic properties of stator due to the shrink-fit can be taken into account, which requires the sophisticated combined technique of the stress analysis and magnetic measurement in addition to the magnetic field analysis. Furthermore, the effects of the inplane 2-D magnetic anisotropy, the lamination of electrical steel sheets, and the hysteresis of non-oriented sheets can be analyzed accurately within the allowable computation time. In this presentation, their advanced techniques are explained, and several techniques expected in the near future are also described.
	Comparing Coupled Analysis with Experimental Result for IPMSM Mr. Kan Akatsu, Tokyo university of Agriculture and Technology Comparison results between the coupled analysis results and experimental results are investigated. Although in the low speed range, the analysis result well corresponded with the experimental result, the current ripple and the voltage reference were bigger than analysis results at the base speed. In this presentation, the iron loss compensation is proposed. By using the proposed method, the current ripple and the voltage reference can estimate at the base speed.
	The Axial Air Gap Permanent Magnet Motor for Air Conditioners Mr. Takushi Fujioka, FUJITSU GENERAL LIMITED The axial air gap motor can supply the higher power than the radial air gap motor, if the diameter of Rotor D is large. Because the former power is proportional to D3, and the later is proportional to D2L. In this report, some outlines of the axial air gap permanent magnet motor for air conditioners are explained. Then its advantages and some problems are also discussed, comparing with the radial motor.
	Magnetization Patterns and Motor Efficiency of the NEOQUENCH-DR Mr. Takao Yabumi, DAIDO STEEL Co., Ltd. NEOQUENCH-DR is the world's best quality radial anisotropic ring magnet noted for its superior magnetic properties, formed by advanced hot processing. This magnet has the motor characteristics suitable for applications that require high-power and high performance including EPS (Electric Power Steering) motors. In this paper, a brushless motor with the NEOQUENCH-DR magnet is analyzed using JMAG with respect to the induced voltage with a sinusoidal wave and the reduction of cogging torque, which is the key factor in achieving better performance, focusing on their correlations with the magnetization patterns. For, a 6-pole 9-slot surface magnet motor with use of the NEOQUENCH-DR magnet, how the skewed magnetization affects cogging torque is analyzed when the magnetizing properties are not uniform in the direction of the height of the magnet. It is found that applying the skewed magnetization pattern in accordance with the distribution of magnetization properties along the magnet height can reduce cogging torque. Furthermore, an 8-pole 12-slot surface magnet motor with use of the NEOQUENCH-DR magnet is applied to analyze the effects of the magnetization pattern in the circumferential direction and skewed magnetization on the cogging torque and induced voltage waveform. As a result, it is found that coupling the skewed magnetization and magnetization gradient, a magnetization pattern in the circumferential direction, can reduce cogging torque and realize the induced voltage with a sinusoidal wave.
	Electromagnetic and Thermal modeling of a permanent magnet Synchronous Machine with either a Laminated or SMC Stator – English Paper Mr Dave Farnia, Burgess-Norton Manufacturing Company
	Evaluation of Motors Using Powder Magnetic Cores by JMAG-Studio Mr. Kinji Kanagawa, MITSUBISHI MATERIALS CORPORATION The powder magnetic cores are made by adding the binders to the insulated soft magnetic powders, molding the mixtures and heat treatment. They have some features those are isotropic magnetic properties, small eddy current loss in high frequency field, and simple production for three-dimensional shapes. However, difference in magnetic properties from electromagnetic steel can't be disregarded for motor design engineers. We estimated the performances of motors with powder magnetic cores using JMAGStudio.
	Magnetic force acting on the toner in the magnetic printer Prof. Norio Kokaji, Meisei University This paper describes analysis of the magnetic force acting on the toner from the magnetic latent image in the magnetic printer. Distance of 1/2dot between the adjoining transition regions on the recording medium was allocated to form one dot black image and the distance of 3/dot between the adjoining transition regions was allocated to form one dot white image. Simulation was done in the case of pixel density of 400 dpi. As a result it was found that strong magnetic force is acted on the toner around the transition region and black image with the length of one dot is formed. The rest part has weak force and becomes white image with the length of one dot.
	Large Stroke Linear Oscillators based on Giant Magnetostrictive Material Mr. Yoshio Mitsutake, Matsushita Electric Works, Ltd. The giant magnetostrictive material (GMM) has characteristics of very large strain which is more than 1000ppm, high energy density, and high responsibility. And the material is expected to be used for fine positioning device or braking system, and so on. On the other hand, although GMM generates large magnetostriction, the upper limit of strain generated by a GMM element which has about 10mm length, is ƒÊm order. Therefore the system of enlarging displacement is necessary in order to realize the large stroke actuator whose stroke is mm order. In this study, the large stroke linear oscillators based on GMM with the system of enlarging displacement are investigated, and the dynamic performance of each model is evaluated.
	Analysis of Transformer using JMAG-Studio Mr. Hidenori Uematsu, Panasonic Electronic Devices Co.,Ltd. We analysis about various phenomena of a transformer using JMAG. I will introduce mainly the inductance, the heat and the vibration.
	Recent Small High Power BL Motors Mr. Morihiro Saito, MOTION SYSTEM TECH INC. This presentation explains the method for designing small, high-power BL motors based on the analysis of its application.
	Development of the In-wheel Multipolar SR motor for an Electric Vehicle based on Magnetic Circuit Method Mr. Kenji Nakamura, Tohoku University Recently, most of the motors are controlled by a power electronics circuit. Therefore, in order to improve the motor performance, the overall analysis and design of the motor, including a drive circuit and an equation of motion, are necessary. In this presentation, using a switched reluctance motor (SR) motor as an example, methods for making a nonlinear magnetic circuit model considering a rotary motion and performing the electromagnetic and motion coupled analysis are described. In addition, the development of the in-wheel multipolar SR motor for a small electric vehicle is introduced.
	Inductance simulation for Bus Bar Mr. Motomichi Ohto, Yaskawa Electric Corp. The switching operation of a power device may cause surges depending on the shapes or configuration of the bus bar in the inverter. In such case, it is important to know the exact value of inductance and resistance of the bus bar. However the values are usually too small to measure. This presentation provides an overview of the simulation using JMAG regarding this problem.
	Motor Design Technologies Considering Detailed Magnetic Properties in Magnetic Core Mr. Akihiro Daikoku, Mitsubishi Electric Corporation For the purpose of decreasing the cogging torque of permanent magnet servo motors, electro-magnetic field analysis methods to consider the detailed magnetic characteristics of the magnetic core are proposed. The detailed magnetic characteristics mean the magnetic characteristics in the actual condition affected by the stress of shrink fitting or the magnetic anisotropy. In the speech, the methods to consider the detailed magnetic characteristics in the magnetic field analysis are described. And the validity of the described methods are evaluated by comparing the measured cogging torque with the analyzed cogging torque for the verification motor.
	Magnetic Field Analysis of Concentrated Winding PM Motor Mr. Yukihiro Noda, TOYO ELECTRIC MFG.CO.,LTD This presentation shows the inductance of concentrated winding PM motor obtained from the simulation using JMAG as well as the analysis example of in-wheel motor that is under development.
	Evolution of Recent Electric Motorsn Prof. Masayuki Morimoto, Tokai University Recent progress of small and medium sized motors for household appliances or automobiles will be shown. The situation of these motors today should be called on the "evolution" stage. The improvement of performance has been done mainly by a design conventionally, though, the recent improvement comes from manufacturing, material and application oriented design. Such progress is changing the shape and the geometrical structure of motors. This progress expands an application area of motors. New application area is producing new motor technology.
	A General View of IPM Motor Control and Some Practical Examples Prof. Mikihiko Matsui, Tokyo Polytechnic University In recent years, IPM (Interior Permanent Magnet) synchronous motors are attracting a wide attention as specific application oriented motors, such like air conditioner and EV (Electric Vehicle) use ac servo motors. This presentation surveys the background of IPM motor control with paying attention to its modeling theory and PWM inverter control. Prototyping of small sized EV use IPM motors and their evaluation to extract control parameters, and an example of torque and loss evaluation using JMAG are also introduced.
	Transition of IPMSM for Air-Conditioners, and a Future Trend Mr. Yuichi Yoshikawa, Motor Company Matsushita Electric Industrial Co.,Ltd. There has been a strong demand for smaller and more efficient motors for electrical appliances such as air conditioners from the standpoint of environmental protection. This presentation will discuss the transition and future trends of IPMSM for air conditioners.
	Recent Development of Non-oriented Silicon Steel and Evaluation Techniques Mr. Hisashi Mogi, Nippon Steel Corporation Electrical steel sheets are used for high efficient motor cores in such as a high-speed rotation machine, an electrical vehicle (HEV/EV) and an air-conditioner, which are significantly affected by the magnetic properties. In this paper a recent development of electrical steel is introduced for high-speed rotor material, and for low loss core material. Manufacturing influences by punching and clinching are examined, since they deteriorate the magnetic properties. The deterioration caused by punching is observed by the domain patterns near the sheared area with a scanning electron microscope, and short circuit loss is evaluated by measurement of inter-laminar resistance and calculation of induction.
	Current Status of NdFeB Magnet and Magnetic Circuit Design Mr. Yasuhiro Marukawa, NEOMAX CO.,LTD • Trend of NdFeB Permanent Magnet • Magnetization Analysis • Demagnetization Analysis • Examples of Motor Analysis
	AC Loss Reduction of Superconducting Power Transmission Cables comprising coated conductors Yokohama national University – English Paper

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