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Numerical analysis of electromagnetic forces in low voltage AC circuit breakers using 3-d finite element method taking into account eddy currents

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IEEE TRANSACTIONS ON MAGNETICS 1998年第5期34卷 2597-2600页

作者： Ito, S Takato, Y Kawase, Y Ota, T Fukuoka Inst Technol Dept Elect Higashi Ku Fukuoka 81102 Japan Gifu Univ Dept Elect & Comp Engn Gifu 50111 Japan

It is necessary for the optimum design of low voltage circuit breakers to analyze electromagnetic Forces acting on the contact systems when the circuit breakers interrupt fault currents. In this paper, the forces which are known as the magnetic blowout force acting on the are and the electromagnetic repulsion force acting on the moving contact arm are obtained by using the 3-d finite element analysis taking into account eddy currents. It is shown that our 3-d analysis is capable of evaluating a new design of contact systems in low voltage ac switching devices.

关键词： electromagnetic forces eddy currents circuit breakers 3-d finite element method

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Performance analysis of electromagnetic Id transmission system using 3-d finite element method

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IEEE TRANSACTIONS ON MAGNETICS 1998年第5期34卷 3206-3209页

作者： Kawase, Y Mori, T Hirata, K Mitsutake, Y Gifu Univ Dept Elect & Comp Engn Gifu 5011193 Japan Matsushita Elect Works Ltd Osaka 5718686 Japan

Great notice is taken of electromagnetic Td (Identity) transmission systems. Therefore, the 3-d numerical analysis is useful for optimum design of high frequency Id card systems which have complex structure. In this paper, we propose a new method for computing the transmission performance employing the 3-d finite element method. In this method, the current vector analysis and the magnetic field analysis are coupled. The effectiveness of this method is clarified through the comparison with the measured results of the induced voltage of the secondary coil. In addition the influence of the angle formed by the primary and the secondary coils on the directivity is investigated.

关键词： electromagnetic Id transmission systems 3-d finite element method current vector analysis

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Magnetic field analysis of coupling transformers for Electric Vehicle using 3-d finite element method

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IEEE TRANSACTIONS ON MAGNETICS 1998年第5期34卷 3186-3189页

作者： Kawase, Y Mori, T Ota, T Gifu Univ Dept Elect & Comp Engn Gifu 50111 Japan

The 3-d analysis is useful for the optimum design of high frequency coupling transformers which have complex structures, It is difficult to predict the current distributions taking into account eddy currents in sheet coils. In this paper, the current density vector analysis and the magnetic field analysis taking into account eddy currents in the spiral sheet coils are coupled. The exciting current characteristics and copper loss are calculated by our method. It is shown that the load characteristics can be accurately calculated by comparing with measurements, The copper loss distributions taking into account eddy currents in the coils are also shown quantitatively.

关键词： coupling transformer 3-d finite element method spiral sheet coil eddy current copper loss

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Simulation of the 3-phase induction motors with skewed rotor slots for reducing torque ripple by the 3-d finite element method 25

Simulation of the 3-phase induction motors with skewed rotor...

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25th International Conference on Electrical Machines and Systems (ICEMS)

作者： Watcharakhup, Somsak Polsena, Adisorn Panpean, Chakrit Rajamangala Univ Technol Isan Sch Elect Engn Nakhon Ratchasima 30000 Thailand

ISBN: (纸本)9781665493024

This paper presents the torque ripple reductions of 3-phase induction motors with skewed rotor slots related to increase the torque and then filter the sine waveform of magnetic flux density by adjusting skewed rotor slots with the original structure. Skewed rotor slots and normal rotor slots systems are considered in term of simulation results and characteristics for optimized applications. There is tool applied for these solutions as above including 3-d finite element method is applied on MATLAB program computer. The equation based on the simulations is shown in the form of the second order partial differential equation with time-dependent conditions. The results of both Skewed rotor slots and normal rotor slots systems based on steady state and full load of 3-phase induction motor, 4-pole, 3-HP, squirrel-cage and double-layer motor. MATLAB is developed for considering 3-d graphics of the simulated 3-phase induction motor.

关键词： 3-phase induction motor simulation 3-d finite element method skewed rotor slots torque ripple

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dynamic Characteristics Analysis of Claw-Poled Stepping Motor Employing 3-d finite element method

Dynamic Characteristics Analysis of Claw-Poled Stepping Moto...

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12th International Conference on Electrical Machines and Systems

作者： Suzuki, Satoshi Kawase, Yoshihiro Yamaguchi, Tadashi Yoshimura, Tomohiko Hirata, Katsuhiro Ota, Tomohiro Gifu Univ Dept Informat Sci Gifu Japan Osaka Univ Dept Adapt Machine Syst Suita Osaka 565 Japan Panasonic Elect Works Co Ltd Osaka Japan

ISBN: (纸本)9781424451777

When the claw-poled stepping motor is rotated at high speed, the torque remarkably deteriorates because of the eddy current generating in the stator core. In this paper, the influence of the stator core materials on the dynamic characteristics of a claw-poled stepping motor is evaluated using the 3-d finite element method. The validity of the calculated results is clarified through the comparison with the measured ones.

关键词： claw-poled stepping motor eddy current loss 3-d finite element method powder magnetic core

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Reinforcement Analysis of Wanjiakouzi Arch dam Using 3d Nonlinear finite element method

Reinforcement Analysis of Wanjiakouzi Arch Dam Using 3D Nonl...

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International Conference on Civil Engineering and Building Materials (CEBM)

作者： Wei Wei Jiang Qinghui Yao Chi Xie Tao Wuhan Univ State Key Lab Water Resources & Hydropower Engn S Wuhan 430072 Peoples R China Wuhan Univ Sch Civil Engn Wuhan 430072 Peoples R China

ISBN: (纸本)9783037851395

Wanjiakouzi arch dam is constructed in a complex geological site, where a large number of faults, interlayer shear bands and karst zones exist in the dam foundation and abutments. The weak rocks have a bad effect on the stability of the arch dam. In this paper, the displacement distribution and stress field of the arch dam are analyzed using 3d nonlinear finite element method. The numerical results show that displacement between both left and right bank abutments is obviously asymmetric and there is greater compression and shear deformation along the faults under the thrust of the arch dam. Furthermore, the tensile stress at dam heel cannot meet the requirement of the design specifications. Therefore, it is necessary to reinforce the dam foundation and abutments to improve the ability to resist deformation of abutment. By taking such reinforcement measures as concrete plugs and consolidation grouting for weak zones, the asymmetric displacements between abutments are decreased significantly and the tensile stresses of dam heel meet the stability requirement.

关键词： Wanjiakouzi hydropower station arch dam complex foundation 3-d finite element method reinforcement

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3-d finite element analysis of rotary oscillatory actuator using a new auto-mesh coupling method

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IEEE TRANSACTIONS ON MAGNETICS 2001年第5期37卷 3711-3714页

作者： Kawase, Y Yamaguchi, T Yoshida, M Hirata, K Gifu Univ Dept Informat Sci Gifu 5011193 Japan Matsushita Elect Words Ltd Analyt Technol Res Lab Osaka 5718686 Japan

In this paper, a new auto-mesh coupling method for the 3-d finite element analysis Is proposed to compute the dynamic characteristics. This method is applied to a rotary oscillatory actuator. The usefulness of this method is confirmed when it is applied to obtain the torque and the dynamic characteristics of a rotary oscillatory actuator. Furthermore, the effectiveness of this method is verified through the comparison between the calculated and the measured results.

关键词： 3-d finite element method auto-mesh coupling method rotary oscillatory actuator

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3-d dynamic transient analysis of stepping motor for wristwatch by finite element method

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IEEE TRANSACTIONS ON MAGNETICS 1998年第5期34卷 3130-3133页

作者： Kawase, Y Suwa, K Sekino, H Gifu Univ Dept Elect & Comp Engn Gifu 50111 Japan Seiko Epson Co Ltd Nagano 392 Japan

Stepping motors are widely used for various electric instruments. It is necessary for the optimum design to analyze the dynamic characteristics accurately. Our method, which is the 3-d finite clement method with edge elements taking into account the rotation of the armature, has been expanded to analyze the dynamic characteristics of a stepping motor for wristwatch excited from square pulse voltage source. The validity of our method is confirmed by experiments.

关键词： 3-d finite element method stepping motor dynamic transient analysis

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3-d finite element analysis of rotary oscillatory actuator using a new auto-mesh coupling method

3-D finite element analysis of rotary oscillatory actuator u...

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9th Biennial IEEE Conference on Electromagnetic Field Computation (CEFC)

作者： Kawase, Y Yamaguchi, T Yoshida, M Hirata, K Gifu Univ Dept Informat Sci Gifu 5011193 Japan Matsushita Elect Words Ltd Analyt Technol Res Lab Osaka 5718686 Japan

关键词： 3-d finite element method auto-mesh coupling method rotary oscillatory actuator

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3-d finite element analysis of a linear induction motor

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IEEE TRANSACTIONS ON MAGNETICS 2001年第5期37卷 3668-3671页

作者： Yamaguchi, T Kawase, Y Yoshida, M Saito, Y Ohdachi, Y Gifu Univ Dept Informat Sci Gifu 5011193 Japan Toyota Automat Loom Works Ltd Ohbushi 4748601 Japan

This paper presents the thrust characteristics analysis of linear induction motors (LIMs) using the 3-d finite element method (3-d FEM) with edge elements taking into account eddy currents. LIM's have advantages of simple structure, easy maintenance, less environmental pollution and so on. Therefore, they are widely used for high speed transport systems in clean rooms and hospitals. However, it is difficult to analyze the thrust characteristics of LIM's numerically because of the three dimensional shape. In this paper, we calculate the thrust of a LIM using the 3-d FEM. It is clarified that the validity of the 3-d FEM by comparison of the calculated and measured results.

关键词： 3-d finite element method linear induction motor thrust characteristics

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