• Proceedings of the KIEE Conference
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• 2001.07b
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• pp.693-695
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• 2001

A computational method for the 3 dimensional electro-magnetic induction problems has been developed. The proposed method is capable of modeling the eddy current and analyzing its characteristics using only scalar potential. A benchmark model of asymmetrical conductor with a hole is analyzed to verify the application of the developed method. The calculated value of magnetic flux density are compared with the measured value, and the results indicate that the developed method is valid.

• Proceedings of the KIEE Conference
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• 1997.07a
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• pp.159-161
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• 1997

This paper presents a method of reducing cogging torque and improving average torque by changing the dead zone angle of trapezoidal magnetization distribution of rotor magnet in ring type. Because brushless d.c. motor has 3D shape of overhang, 3D analysis should be used for computation of its magnet field. In this paper, Three Dimensional Equivalent Magnetic Circuit Network method (3DEMCN) which can calculate an accurate 3D magnetic field has been introduced. The method has an advantage that nonlinear magnetic phenomena can be considered and the cogging torque analyses requesting the rotation of the rotor can be performed by the variation of magnetization distribution without remesh.

• Proceedings of the KIEE Conference
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• summer
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• pp.1043-1045
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• 2004

This paper deals with the core loss calculation of a BLDC motor made of Soft Magnetic Composite material. Since the teeth of motor partially have overhang in axial direction, 3 - dimensional equivalent magnetic circuit network (3D-EMCN) is used as an analytical method to get flux density of each element. The total core loss is calculated with the magnetic flux density and core loss curves of the SMC material. The calculated result is compared with core loss of the motor without overhang in stator teeth.

• Proceedings of the KIEE Conference
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• 2003.07b
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• pp.894-896
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• 2003

This paper present the design algorithm using torque and rotor volume(TRV). And, this paper introduce that how to applying the 3-Dimensional Equivalent Magnetic Circuit Network(3D EMCN) and brushless motor circuit simulator. This algorithm is applied the design program, the design shape is compared with existed brushless motor.

• Journal of Magnetics
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• v.15 no.2
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• pp.64-69
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• 2010

This paper describes the development of a novel transverse flux linear motor (TFLM) excited by permanent magnets (PMs). It combines the advantage of two different TFLMs and produces high thrust with reduced normal force. The magnetic field is analyzed by combining the three-dimensional (3D) equivalent magnetic circuit network (EMCN) method with 2D finite element analysis. The experimental findings of the prototype motors are in good agreements with the analysis results, and demonstrate the potential of the proposed motor as a direct drive requiring relatively long displacement of a mover.

• Journal of Electrical Engineering and Technology
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• v.8 no.1
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• pp.118-123
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• 2013

This paper presents performance comparison between concentrated winding and distributed winding of IPMSM (Interior Permanent Magnet Synchronous Motors) which is recently used for light-weight railway applications. Motors are designed on various schemes and analyzed by using FEM (Finite Element Method) instead of EMCNM (Equivalent Magnetic Circuit Network Method) in order to take into account saturation and non-linear magnetic property. The overall performance such as torque, torque ripple, losses, demagnetization, efficiency, power density and so on are investigated in detail at the rated and maximum operating speed. The results of the analysis found that both concentrated and distributed winding IPMSMs are promising candidates for high power railway traction motor.

• Proceedings of the KIEE Conference
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• summer
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• pp.1055-1057
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• 2004

This paper deals with a qualitative analysis of iron loss in Transverse Flux Linear Motor (TFLM). 3D equivalent magnetic circuit network method (EMCNM) is used as an analytical method to get flux density of each element. The total core loss is calculated with the magnetic flux density and core loss curves of an optional material. The results of iron loss analysis can be used as a criterion to decide the manufactural shape such as lamination or solid type core, skew position, etc.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.54 no.3
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• pp.120-126
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• 2005

This paper deals with a Double-type Transverse Flux Linear Motor which can be applied to high power system. This type can reduce overall system volume because it has a double flux path, and less number of phases and turns comparing with prototype for one phase. This machine is based on permanent magnet excitation, and the pole shape is designed to reduce attraction force between stator and mover poles. In the paper, the basic configuration of double type is introduced first, and the principle of movement is explained. After performing the characteristic analysis by 3-dimensional equivalent magnetic circuit network, the results are discussed.

• Proceedings of the KIEE Conference
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• summer
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• pp.1052-1054
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• 2004

This paper deals with a Double type Transverse Flux Linear Motor(TFLM) which can be applied to high power system. This type can reduce overall system volume because of the configuration which has double flux path of prototype per phase, and less number of phase and turns. This TFLM is based on permanent magnet excitation, and the pole shape is designed to reduce attraction force between stator and mover poles. In the paper, the basic configuration of double type and the principle of movement are introduced. After performing the characteristic analysis by 3-dimensional equivalent magnetic circuit network, the results are discussed.

• Proceedings of the KIEE Conference
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• 2003.07b
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• pp.948-951
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• 2003

The design and analysis of electrical machines often require analytical models for performance assessment and system simulation. Inductances are important parameters of these models. In this paper, the methods of calculating apparent and incremental inductances are introduced for a transverse flux linear motor, which has a peculiar coil shape. The computation is accomplished by nonlinear three dimensional finite element method(FEM) and equivalent magnetic circuit network(EMCN). The improved method has been verified by a test result.