International Journal of Applied Electromagnetics and Mechanics - Volume 19, issue 1-4

Authors: Jung, Sang-Yong | Choi, Ho-Yong | Jung, Hyun-Kyo | Hahn, Song-Yop

Article Type: Research Article

Abstract: The characteristics of the phase unbalance in a moving-coil type Permanent Magnet Linear Synchronous Motor(PMLSM) for travelling the reciprocating trajectory are presented. The phase unbalance caused at end coils, such as deficiency and asymmetry of each phase EMF, is thoroughly investigated. Moreover, a compensating method that can minimize such phase unbalance by adjusting the mechanical air-gap length is proposed, and its effectiveness is verified in a practical application.

Keywords: phase unbalance, end effect, linear synchronous motor

DOI: 10.3233/JAE-2004-565

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 213-218, 2004

Authors: Chen, Zhenmao | Takashima, Hideyoshi | Miya, Kenzo

Article Type: Research Article

Abstract: This paper presents a hybrid database approach for simulation of remote field eddy current testing (RFECT) signals due to a local defect. By calculating databases related to the coils with an axisymmetric 2D code and that due to unit sources by a 3 dimensional FEM analysis, 3D simulation of the RFECT signal due to a local defect is successfully realized by using the database approach developed by authors. The validity of the approach is verified by …comparing the signal due to a full-length circumferential defect calculated with the proposed hybrid database approach and the axisymmetric 2D code. Show more

Keywords: RFECT, hybrid database approach, fast forward scheme, 3-D analysis

DOI: 10.3233/JAE-2004-566

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 219-223, 2004

Authors: Schofield, N. | Canova, A. | Gruosso, G. | Repetto, M. | Ottella, M.

Article Type: Research Article

Abstract: The paper presents the design synthesis and construction of a tubular linear, permanent magnet actuator for automotive applications. The application of soft magnetic composites in permanent magnet machines is discussed, since conventional lamination techniques are cost prohibitive for the tubular linear topology considered. The linking of analytic and finite element techniques in the design synthesis is presented along with characterisation test data from a prototype actuator constructed to validate the design procedure.

DOI: 10.3233/JAE-2004-567

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 225-229, 2004

Authors: O'Sullivan, T.M. | Schofield, N. | Bingham, C.M.

Article Type: Research Article

Abstract: Dynamic models of electrical machines and their associated drive-train mechanics have had limited experimental validation to-date, due, primarily, to the difficulty in the dynamic measurement of torque. This paper presents results from a study investigating the feasibility of utilising a novel, non-contact, torque measurement system, based on surface acoustic wave (SAW) technology, for application in brushless machine-based, servo drive systems. Simulation of the drive system is facilitated via the implementation of a …linear d-q axis induction machine model, coupled with a multi-mass model of the driven mechanical system. Experimental validation of the simulation models is augmented via a test facility comprising of a direct-on-line (DOL) squirrel cage induction machine coupled to an induction generator which provides an electromagnetic and inertial load. The results presented show a good correlation between simulation models and experimental test data previously not acheivable prior to the SAW technology due to the absence of a torque measuring system having suitable bandwidth. Show more

DOI: 10.3233/JAE-2004-568

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 231-236, 2004

Authors: Jakeman, Nigel | Bullough, William | Bingham, Chris | Mellor, Phil

Article Type: Research Article

Abstract: The paper describes the specification, modelling, magnetic design, thermal characteristics and control of a novel, high acceleration (up to 82g) brushless permanent magnet linear actuator with Halbach array, for textile package winding applications. Development, optimisation and the construction of a prototype machine is discussed in detail. Experimental results demonstrate the realisation of the actuator and induced performance advantages afforded by the closed loop position control system.

Keywords: linear actuator, halbach array, textile winding, phase lead control

DOI: 10.3233/JAE-2004-569

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 237-242, 2004

Authors: Ebine, Noriya | Suzuki, Masahide | Ara, Katsuyuki | Kikuchi, Hiroaki | Abe, Takashi | Kamada, Yasuhiro | Takahashi, Seiki | Fujiwara, Koji

Article Type: Research Article

Abstract: A device for nondestructive measurement of dc hysteresis magnetization characteristics of Charpy impact test pieces was developed for investigating the correlation between changes of ductile-brittle transition temperature and magnetic hysteresis characteristic of nuclear reactor pressure vessel steel due to neutron irradiation. Operation tests verified satisfying performances of its designed functions.

Keywords: hysteresis magnetization curve, charpy impact test, nondestructive measurement, nuclear reactor pressure vessel steel

DOI: 10.3233/JAE-2004-570

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 243-248, 2004

Authors: Ueno, Toshiyuki | Qiu, Jinhao | Tani, Junji

Article Type: Research Article

Abstract: A magnetic force control device with composite laminate of a giant magnetostrictive material (GMM) and a piezoelectric material (PZT) is proposed. This magnetic force control is based on inverse magnetostrictive effect of the GMM, whereby variation of the magnetization in the GMM changed with a applied voltage on PZT is converted to that of magnetic force by the magnetic circuits. Because of the capacitive properties of the PZT, the device requires no electric energy hence generates …no heat to maintain constant force. Furthermore compared with conventional electromagnets, the device is simple and easy to assemble. In this paper, the principle of the magnetic force control is presented and the static and dynamic characteristics of the device are examined. Show more

Keywords: giant magnetostrictive material, piezoelectric material, lamination, magnetic force control

DOI: 10.3233/JAE-2004-571

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 249-252, 2004

Authors: Schimmanz, Klaus | Kost, Arnulf

Article Type: Research Article

Abstract: The capability of hybrid Integrated Circuits (IC) depends essentially on resistor precision. This is nowadays achieved by laser trimming of film resistors. This process can be highly supported by a robust method of computational electromagnetics. The paper shows how the Boundary Element Method (BEM) is used to simulate important quantities of the process.

Keywords: film resistor design, laser trimming, boundary element method

DOI: 10.3233/JAE-2004-572

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 253-256, 2004

Authors: Endo, Hisashi | Marinova, Iliana | Hayano, Seiji | Saito, Yoshifuru

Article Type: Research Article

Abstract: This paper investigates a rule of nonlinear systems exhibiting chaotic phenomena. A typical ferroresonant circuit is studied by the Chua-type magnetization model representing magnetodynamics. The nonlinear calculation with state variable equation is carried out to clarify the ferroresonant phenomenon. The characteristic values of the state transition matrix are also calculated in each of iteration steps. It reveals that they have no hysteretic properties even though chaotic behavior is exhibiting.

DOI: 10.3233/JAE-2004-573

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 257-261, 2004

Authors: Sudo, Seiichi | Orikasa, Reiko | Honda, Takashi

Article Type: Research Article

Abstract: This paper is concerned with the micro swimming mechanism propelled by the alternating magnetic field in a water pipe. Locomotive characteristics of the swimming mechanism are investigated for the purpose of the development of micro robots which work in human blood vessels. The swimming mechanism is composed of a small magnet attached to a polyethyleneterephthalate film. The dynamic behaviour of the mechanism is analyzed by a three-dimensional motion analysis system. It was found that the propelling …velocity depends on the excitation frequency and dimension of the polyethyleneterephthalate film. Show more

Keywords: micro robot, alternating magnetic field, swimming mechanism, wireless locomotion

DOI: 10.3233/JAE-2004-574

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 263-267, 2004