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

Authors: Masserey, Alexandre | Rappaz, Jacques | Rozsnyo, Roland | Touzani, Rachid

Article Type: Research Article

Abstract: We present an extension of a 2D cartesian electromagnetic and thermal model to achieve the optimal control of an industrial induction heating system. The control variables are the frequency and the power. We explain how to derive the discrete optimal control algorithm and show the numerical results we obtained for a specific case.

Keywords: electromagnetism, frequency, power, optimal control, optimization

DOI: 10.3233/JAE-2004-535

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 51-56, 2004

Authors: Kraftmakher, Galina

Article Type: Research Article

Abstract: Novel composite medium with simultaneously negative permeability and permittivity at microwave range is presented. The medium contains cutoff waveguide structures and chiral or chiro-ferrite inclusions. Microwave response of such medium is investigated under chiral and chiro-ferromagnetic resonances.

Keywords: microwave, cutoff structure, chiral inclusions, effective permittivity, permeability, antireflective properties

DOI: 10.3233/JAE-2004-536

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 57-61, 2004

Authors: Kharytonov, A.A.

Article Type: Research Article

Abstract: We consider some inverse boundary problems which are to determine the coefficients or functions of elliptic differential equations inside the domain Ω from a knowledge of boundary conditions (the Cauchy data) on ∂Ω. An algorithm for the numerical solution of such problems is presented. The iterative methods and the theory of the Poincaré-Steklov operator are the basis of our consideration. This algorithm can be used for the solution of the inverse conductivity problem …and for the determination of the potential in the Schrödinger equation. Show more

Keywords: inverse problem, parameter identification, Poincaré-Steklov operator, Oseen linearization, Schrödinger equation

DOI: 10.3233/JAE-2004-537

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 63-67, 2004

Authors: Yamaguchi, Tadashi | Kawase, Yoshihiro | Sano, Shinya | Nagai, Hidenori | Nakamura, Masanori

Article Type: Research Article

Abstract: In this paper, we introduce the three-dimensional finite element method (3-D FEM) taking into account the Δ-connected circuit for obtaining the induced voltages of the three-phase motor. We calculate the induced voltage of interior permanent magnet (IPM) motor taking into account the Y- or the Δ-connected circuit of motors using the proposed method. The effects of the connection on the induced voltage are numerically analyzed. The validity of our method is clarified by …comparing the calculated results and measured ones. Show more

Keywords: the three-dimensional finite element method, Δ-connected circuit, Y-connected circuit

DOI: 10.3233/JAE-2004-538

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 69-73, 2004

Authors: Guo, Y.G. | Zhu, J.G. | Zhong, J.J. | Watterson, P.A. | Wu, W.

Article Type: Research Article

Abstract: This paper presents an improved method for predicting magnetic power losses in electrical machines with soft magnetic composite (SMC) cores. Different formulations are used for magnetic power loss prediction with purely alternating, purely circular rotating, and elliptically rotating flux density vectors, respectively. A series of three-dimensional (3D) finite element analyses is conducted to determine the flux density locus in each element in a claw pole permanent magnet SMC electrical machine when the rotor rotates. The …predicted results are compared with the experimental data of the prototype. Show more

Keywords: magnetic power loss, SMC, electrical machine, finite element analysis

DOI: 10.3233/JAE-2004-539

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 75-78, 2004

Authors: Jabbar, M.A. | Dong, Jing | Liu, Zhejie

Article Type: Research Article

Abstract: A field – circuit coupled approach has been used to compute the magnetic field of a permanent magnet synchronous motor. The motor drive system has been modeled using field equations to represent its magnet system, which is coupled with equivalent circuit equations to represent the stator windings, the rotor cage bars and various control circuits. A time stepping finite element method for the solution is used. A good match between the computational and experimental results has …been achieved. Show more

Keywords: field – circuit coupled approach, finite element method, time stepping

DOI: 10.3233/JAE-2004-540

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 79-85, 2004

Authors: Nagaya, Kosuke | Kobayashi, Hiroyuki | Suzuki, Takaaki | Koike, Kazuya | Takahashi, Noriaki | Zhang, Xujing

Article Type: Research Article

Abstract: A new type driven valve system for combustion engines has been presented, in which a cam is made of permanent magnet, and a roller rocker arm is made of cylindrical permanent magnet. In this system, an attractive force between the cam and the rocker arm due to the magnetic force suppresses jumps and bounces. This makes the friction in the driven valve system decrease. Hence, the resisting torque is decreased by use of this system. This implies …that the energy loss decreases. In addition, since the attractive force suppresses the bounce phenomenon, noise due to the bounce is also suppressed in the present system. The analysis for obtaining the critical speed has been presented, and to validate the theoretical results, experimental test has been carried out. In order to have high-energy efficiency, an electric drive valve phase control system is presented. The valve phase control is carried out for the proposed driven valve system by using our control system. Show more

Keywords: gas heat pump engine, valve system, low energy loss, magnetic valve, valve timing control, low friction, permanent magnet, planet gear, ultrasonic motor, electric motor

DOI: 10.3233/JAE-2004-541

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 87-92, 2004

Authors: Da Luz, Jeanine M. | Longhi, Luís G.S. | Zaro, Milton

Article Type: Research Article

Abstract: This work presents the development of a measurement system based on magnetoresistive sensors. The experimental system is used to measure small moves in the space, being suitable for applications where the absence of contact is required. The developed apparatus is described, modelled, and an experimental run is presented to illustrate its behaviour.

Keywords: magnetoresistive sensors, biomedical engineering applications, displacement measure, mandible movement

DOI: 10.3233/JAE-2004-542

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 93-97, 2004

Authors: Le Bihan, Yann

Article Type: Research Article

Abstract: In this paper, a simple analytical model of an eddy current sensor having an U-shaped magnetic core and a conductive shielding is presented. Results obtained with the developed model are then compared with data issued from measurements and show a fair agreement. The main advantage of this analytical model lies in its simplicity of implementation and in its high execution speed comparatively to numerical models.

Keywords: analytical modeling, eddy current, nondestructive evaluation

DOI: 10.3233/JAE-2004-543

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 99-102, 2004

Authors: Wang, Yuhuai | Yang, Shiyou | Ni, Guangzheng | Ni, Peihong | Ho, S.L.

Article Type: Research Article

Abstract: Based on the success in the design of an Emigration Operator and the introduction of other approaches such as the fitness sharing, the clustering method, and the elitism strategy, an Emigration Genetic Algorithm is now proposed for the vector optimizations of electromagnetic devices. Numerical results are reported to demonstrate the effectiveness of the proposed algorithm in solving engineering multiobjective optimal design problems.

DOI: 10.3233/JAE-2004-544

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 19, no. 1-4, pp. 103-109, 2004