International Journal of Applied Electromagnetics and Mechanics - Volume 52, issue 1-2

Authors: Nakamura, Yuta | Morishita, Mimpei

Article Type: Research Article

Abstract: Authors made a single-point suspended electromagnetic suspension (EMS) system. This EMS system was applied to the carrier of a transport system. The pitching motion of the carrier converges faster than our physical expectation when the carrier is accelerated or decelerated. The eddy current loss in the iron plate and iron cores due to pitching motion was calculated by a 3D magnetic field analysis software. The calculation result and the experimental one made it clear that such swing convergence is caused by eddy current loss.

Keywords: Electromagnetic suspention, single-point suspention, eddy current, 3D-magnetic field analysis

DOI: 10.3233/JAE-162038

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 161-167, 2016

Authors: Takazakura, Toyoki | Morita, Toshio | Sugiura, Toshihiko

Article Type: Research Article

Abstract: In general cam mechanisms, mechanical contact between a cam driver and a cam follower causes problems such as frictional wear, needs for lubrication and noise. Accordingly, we proposed a new cam mechanism whose contact parts are replaced by permanent magnets exerting repulsive force on each other. The purpose of this study is to investigate the efficacy of the mechanism which can drive without mechanical contact. To evaluate the effectiveness of the mechanism, we constructed an analytical model, derived an equation of motion of the cam follower and conducted numerical calculation of it. Furthermore, we conducted experiments corresponding to the model. …As a result, occurrence of superharmonic resonance and collision of the driver and the follower in the neighborhood of the primary resonance point were observed. However, except in occurrence region of them, the rotating motion of the driver was favorably converted into reciprocating motion of the follower without contact. Thus we concluded that a magnetic cam is useful at appropriate rotational speed of the driver. Show more

Keywords: Numerical simulation, electromagnetic induced vibration, nonlinear vibration

DOI: 10.3233/JAE-162036

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 169-174, 2016

Authors: Xue, Xiaomin | Chen, Luqi | Wu, Xiaohong | Sun, Qing

Article Type: Research Article

Abstract: The Macro Fiber Composite (MFC) is the leading low-profile actuator or sensor offering high performance, durability and flexibility in a cost competitive device. As an ideal candidate of active-control devices, its application, however, is restricted by the complicated electromechanical characteristics, and also restricted by the unavoidable time delay lying in the MFC's actuated systems. Given this, this paper attempts to design a GA-based controller for mitigating clamped-free beam actuated by the MFC patches, in which these two factors are both considered. Finally numerical examples and corresponding experimental cases are used to testify the proposed approach is effective in mitigating vibration …with different time delays. Also recommended are the implications of the current study on vibration control for other smart structures. Show more

Keywords: MFC, vibration control, GA controller, time delay, clamped-free beam

DOI: 10.3233/JAE-162086

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 175-182, 2016

Authors: Jia, Kun | Fan, Zongwei | Yang, Keji

Article Type: Research Article

Abstract: Additive rapid prototyping categorized into fused deposition modeling (FDM) and micro-stereolithography has received increasing interest in the past decade. Recent advance in FDM enables multiple materials to be printed in the same layers of a component. However, for micro-stereolithography, it is still a challenge to fabricate complex structure embedded with another material. In this work, a noncontact ultrasonic clamping stage is proposed for micro-stereolithography to hold the material or structure encapsulated by photo-curable polymer which will be solidified after exposure to UV light. In order to achieve this, ultrasound field is generated by three 2 MHz PZT transducers in millimeter …sized region of a chamber filled with photosensitive fluid. Theoretical analysis illustrates that acoustic radiation force and torque will drive micro-particles in the sound field to force potential minimum and maintain their own equilibrium posture. Finally, rectangular silica particle with 100 μ m characteristic length is used to perform the controllability of our device. Show more

Keywords: Micro-stereolithography, embedded material, non-contact trapping, acoustic radiation force

DOI: 10.3233/JAE-162096

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 183-190, 2016

Authors: Osa, Masahiro | Masuzawa, Toru | Saito, Takuya | Tatsumi, Eisuke

Article Type: Research Article

Abstract: An axial gap maglev motor with double stators that can control five-degrees of freedom (5-DOF) of rotor postures has been newly developed for pediatric ventricular assist devices (VADs). The motor has two stators that have an identical structure and a levitated rotor. The rotor is levitated magnetically between the stators and is driven by the mechanism of a synchronous permanent magnet motor. A double-stator structure achieves active 5-DOF posture control and enhances torque production. In this paper, a maglev motor as an actuator of pediatric VAD has been designed and miniaturized based on magnetic field FEM analysis. The performance of …the maglev motor, the static magnetic suspension force and the torque of the developed motor, is measured experimentally and is sufficient for stable levitation and rotation. Show more

Keywords: 5-DOF control, magnetically levitated motor, ventricular assist device, pediatric, miniaturization

DOI: 10.3233/JAE-162224

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 191-198, 2016

Authors: Kurita, Nobuyuki | Ishikawa, Takeo | Saito, Naoki | Masuzawa, Toru

Article Type: Research Article

Abstract: A self-bearing motor that has tilt control function is proposed. The rotor has two permanent magnets on each side (four PMs in total). The two stators have eight poles each with concentrated windings. The operating principle was clarified by theoretical analysis and FEM analysis. Moreover, it was shown that the proposed motor can control the translation motion, inclinational and rotational motion independently. An experimental setup was fabricated and magnetically levitated rotation was achieved. The control performance of the self-bearing motor was also investigated. In addition, the proposed axial self-bearing motor is also designed and fabricated into a prototype maglev pump. …Fabricated pump test rig showed sufficient performance for left ventricular assist device (LVAD) application of 4.35 L/min at 100 mm Hg. Show more

Keywords: Self-bearing motor, magnetically levitated pump, ventricular assist device, total artificial heart

DOI: 10.3233/JAE-162175

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 199-206, 2016

Authors: Annasiwaththa, Buddhika Imantha | Oka, Koichi

Article Type: Research Article

Abstract: This paper presents the design concept of a magnetically levitated linear slider with non-contact energy transfer, and an analysis of the major components of the design. An open-end generator is introduced to achieve non-contact energy transfer to the levitated platform. Utilization of non-contact energy transfer will overcome difficulties related to charging batteries. Furthermore, we have proposed an improvement for a hybrid electromagnet to achieve better passive lateral alignment under zero power control. The results of FEM analysis and practical testing show that the concept is promising for further study with a prototype system.

Keywords: Magnetic levitation, non-contact energy transfer, linear actuator, finite element analysis

DOI: 10.3233/JAE-162039

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 207-213, 2016

Authors: Mashino, Masahiro | Ishida, Masaki | Narita, Takayoshi | Kato, Hideaki | Yamamoto, Yoshio

Article Type: Research Article

Abstract: Nowadays, ultra-compact electric vehicles have been increasingly demanded under the influence of environmental problem and the aged society. The ultra-compact electric vehicles are possible to travel on poor condition roads, such as narrow and unpaved roads. Thus, the ride comfort of the vehicles is expected to deteriorate when the ultra-compact electric vehicles travel on such road. Then it is important to reduce vibration of the vehicle. To solve these problems, we suggest active seat suspension that can be installed in ultra-compact electric vehicles. In this paper, we focused on the electrooculogram when fall from the bump of roadway boundary.

Keywords: Active seat suspension, ultra-compact electric vehicle, ride comfort, electrooculogram

DOI: 10.3233/JAE-162137

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 215-222, 2016

Authors: Javed, Asief | Mizuno, Takeshi | Takasaki, Masaya | Ishino, Yuji | Hara, Masayuki | Yamaguchi, Daisuke

Article Type: Research Article

Abstract: A method of suppressing vibration in lateral directions is investigated based on varying stiffness strategy. A vertically controlled magnetic suspension system is often subjected to vibration in lightly damped lateral directions. In this paper, a novel approach is proposed to detect the lateral displacement of such magnetic suspension system, and how this displacement can be used to reduce vibration by varying stiffness control is presented. The principle of edge effect is applied to detect the lateral displacement in a magnetic suspension system operated in differential mode. A switching stiffness control and a modified control strategies are used to vary the …stiffness of the system in order to reduce lateral vibration. Several experiments are carried out to validate the efficiency of the proposed method. Show more

Keywords: Lateral vibration, varying stiffness control, magnetic suspension system, edge effect

DOI: 10.3233/JAE-162064

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 223-229, 2016

Authors: Hasan, Shahajada Mahmudul | Mizuno, Takeshi | Takasaki, Masaya | Ishino, Yuji

Article Type: Research Article

Abstract: A wind tunnel system for a spinning body has been designed for the measurement of the hydrodynamic forces acting on the body. The body was successfully suspended and rotated by electromagnets. This existing arrangement is required to be enlarged to observe more accurate hydrodynamic forces acting on the body. Therefore, for the further development and control, it is important to understand the exact magnetic flux distribution inside the system as well as the variation of the force with the increase of the current. In this paper, both 2D symmetric model and 3D model of the arrangement are taken in consideration …for the analysis. The magnetic flux distributions as well as magnetic force acting on the suspended object are obtained. The magnetic flux densities are analyzed for the variation of current in electromagnets. Actual force acting on the body is also measured. It is observed that the experimental results support the results obtained by numerical analysis. Show more

Keywords: Electromagnetic analysis, magnetic suspension, wind tunnel, spinning body, hydrodynamic force

DOI: 10.3233/JAE-162077

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 52, no. 1-2, pp. 231-241, 2016