International Journal of Applied Electromagnetics and Mechanics - Volume 33, issue 1-2

Article Type: Editorial

Abstract: Preface to Selected Papers from the 14th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2009), Part I

DOI: 10.3233/JAE-2010-1091

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 33, no. 1-2, pp. 1-1, 2010

Authors: Tang, Renyuan | Han, Xueyan | Zhou, Ting

Article Type: Research Article

Abstract: The status of research and analyses of multiple coupling fields of rare earth permanent magnet electrical machines in China is introduced. Permanent magnet electrical machines with novel structure, Permanent Magnet Wind Power Generators, Permanent Magnet AC Servo Motors and Premium- efficiency Line-Start PMSMs are reported respectively.

DOI: 10.3233/JAE-2010-1092

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 33, no. 1-2, pp. 3-23, 2010

Authors: Enokizono, Masato

Article Type: Research Article

Abstract: The national project of the development technology of next generation applied electromagnetic machinery was founded in Oita as Oita Prefecture Innovative JST (Japan Science and Technology Agency) Research Program. In this paper, outline of this project is introduced and the basic technology which is based on vector magnetic property is described. Especially the vector magnetic properties in high flux density level of 1.9 T are shown. As the example results, the dynamic vector magnetic characteristic is …applied to the surface permanent magnet motor. Show more

Keywords: Magnetic characteristic analysis, integration-type dynamic E&S modeling, magnetic power loss, high density machines, high efficiency, magnetic material

DOI: 10.3233/JAE-2010-1093

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 33, no. 1-2, pp. 25-37, 2010

Authors: Zhang, Yongjie | Sun, Qin

Article Type: Research Article

Abstract: Perfectly matched layers (PML) are the layers of electromagnetic wave absorbing elements designed for the mesh truncation of an open domain in a harmonic or modal analysis. It is an artificial anisotropic material that is transparent and heavily lossy to incoming electromagnetic waves. Conformal PML (CPML) is a convex and smooth shell region made up of lossy anisotropic medium. Generally, a conformal PML region is backed by a PEC boundary condition or a PMC boundary condition. …But there are some reflections back into the computational domain by the PEC (PMC) boundary condition. In order to reduce the reflections, the traditional PEC (PMC) boundary condition is changed into vector absorbing boundary condition (ABC), and functional formula of conformal PML backed by vector ABC is deduced in this paper. Numerical experiments show that conformal PML backed by vector ABC is high-precision and high-efficiency. Show more

Keywords: Conformal PML, vector absorbing boundary condition, electromagnetic scattering

DOI: 10.3233/JAE-2010-1094

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 33, no. 1-2, pp. 39-45, 2010

Authors: Lee, Do-Young | Nam, Yun-Joo | Park, Myeong-Kwan | Yamane, Ryuichiro

Article Type: Research Article

Abstract: This paper is concerned with the transparency improvement of a 1-DOF (degree-of-freedom) hybrid haptic device with the wide-ranged haptic reflection. The hybrid haptic device is actuated by the combination of an active actuator and a passive one. A noble hybrid concept for the haptic device is proposed for two purposes; one is to improve the transparency of the haptic device by compensating friction components qualitatively and quantitatively, and the other is to reflect the wide-ranged force …or torque in large workspace. In the proposed hybrid actuation, the passive actuator is used as the main source of the reflective output, since it has the passivity property in nature so that the safety in interaction and the stability in haptic control can be concurrently guaranteed. The active actuator, which is active in nature, is used either for compensating back-driven components in the haptic system or for providing additional outputs in the haptic reflection larger than the maximum capacity of the passive actuator. Show more

Keywords: Haptic reflection, hybrid haptic device, magnetorheological (MR) brake, transparency

DOI: 10.3233/JAE-2010-1095

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 33, no. 1-2, pp. 47-53, 2010

Authors: Qin, Penggao | Chen, Zhihua | Sun, Xiaohui | Li, Baoming

Article Type: Research Article

Abstract: Local MHD hypersonic flow control of a scramjet inlet has been conducted in this paper. Two dimensional Euler equations with MHD terms are used for describing the flow filed variations during the control process. An explicit second order Godunov-type scheme is employed to solve the equation, the immersed boundary condition and a block-structured adaptive mesh refinement technique are adopted to handle the complex boundary and high pressure gradient, respectively. Our numerical results show that the MHD …control can be used to restore the oblique shock waves at off-design conditions with the force applied at the forebody of the first ramp in proper directions. Show more

Keywords: MHD, hypersonic flow, flow control

DOI: 10.3233/JAE-2010-1096

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 33, no. 1-2, pp. 55-61, 2010

Authors: Sudo, Seiichi | Wakuda, Hirofumi | Asano, Daisaku

Article Type: Research Article

Abstract: The purpose of the present paper is to develop the generator of the capillary magnetic fluid jet. The experiments on magnetic fluid sloshing were conducted at first. Based on the results of experimental study on the fluid motions in a longitudinally vibrated tank with a permanent magnet, a magnetic fluid jet generator was developed. The generator is composed of NdFeB magnets, magnetic fluid, small circular cylindrical tank, and a coil. It is found experimentally that the …magnetic fluid droplets and capillary jet are formed by the generator. Show more

Keywords: Magnetic fluids, capillary jet, droplets, jet generator

DOI: 10.3233/JAE-2010-1097

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 33, no. 1-2, pp. 63-69, 2010

Authors: Xiu, Shichao | Tan, Qingchang

Article Type: Research Article

Abstract: According to the static magnetics viewpoint, the no-friction passive magnetic bearings are not stable in their non-load direction. So its position must be limited by certain means for its applications in engineering. Based on the theory of equivalent magnetic charges, the mathematical models for the axial displacement and force of radial passive magnetic bearings were established without any hypothesis and simplifications. In addition, the numerical simulations and the experiments for the axial and radial forces of …radial passive magnetic bearing were performed. It shows that the simulations results tally with the experimental results primarily, and the relative axial displacement between the inner ring and the outer ring of the magnetic bearing not only weakens the radial bearing load capacity regularly, but also induces the axial force and makes the bearings unbalance in axial direction. The researches provide an effective approach to study the performance, the load capacity and the structure of the no-friction passive magnetic bearings. Show more

Keywords: No-friction, passive magnetic bearings, unbalance, model and simulation

DOI: 10.3233/JAE-2010-1098

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 33, no. 1-2, pp. 71-77, 2010

Authors: Nakazaki, Osamu | Kai, Yuichiro | Todaka, Takashi | Enokizono, Masato

Article Type: Research Article

Abstract: This paper presents measured iron loss properties of a rotating machine's stator core at each manufacturing stage. It is well known that the magnetic properties deteriorate in constructed cores due to stress in manufacturing process and the iron loss increases in comparison with one of the ideal material used in designing, and then the building factor becomes more than one. In this paper, knowledge obtained in development of a simplified evaluation method of iron losses in …actual stator cores of rotating machines is presented. Show more

Keywords: Electrical steel sheet, iron loss, manufacturing process, rotating machines

DOI: 10.3233/JAE-2010-1099

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 33, no. 1-2, pp. 79-86, 2010

Authors: Zhu, Zhi-Wen | Liu, Yue | Xu, Jia | Wang, Hong-Li

Article Type: Research Article

Abstract: In this paper, a kind of giant magnetostrictive actuator (GMA) model based on hysteretic nonlinear theory was developed. Nonlinear difference item was introduced to interpret the hysteresis phenomenon of GMA. The coupling relationship between magnetic field intensity and frequency was obtained in stepwise multiple regression method to describe the driftage of strain curve. Based on above, the final relationship among strain, magnetic field intensity and frequency was set up. The result of significance test shows …that the effects of all of the items in the final model are remarkable, which means that the model can describe the characteristics of GMA in different frequencies well. The new GMA model broadens the region of controlling frequency, and is easy to be analyzed in theory, which is helpful to vibration control. Show more

DOI: 10.3233/JAE-2010-1100

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 33, no. 1-2, pp. 87-93, 2010