Gang-Hyeon Jang

Comparison of Axial Flux Permanent Magnet Synchronous Machines With Electrical Steel Core and Soft Magnetic Composite Core

This paper presents a comparison of axial flux permanent magnet machines (AFPMs) with an electrical steel core and that with a soft magnetic composite (SMC) core. SMCs have several advantages such as low core loss and low eddy current loss. However, compared with electrical steel, SMCs have poor magnetic properties such as low flux density saturation and unsaturated relative permeability. The analysis of the electromagnetic characteristics in a wide frequency range revealed that for an AFPM using an electric steel core, the performance was excellent in a low-frequency range; however, for an AFPM using an SMC core, the performance improves with an increase in frequency. Finally, the operation area of an AFPM using an SMC core is proposed.

Characteristic analysis of eddy current loss in permanent magnet linear synchronous generator considering tapped holes in movers using 3D analytical method

This paper describes the use of an analytical approach using a 3D analytical method to calculate the eddy current loss of a permanent magnet linear synchronous generator (PMLSG) considering tapped holes in permanent magnet movers.

Characteristic analysis of axial flux permanent magnet machines with double-sided rotor and soft magnetic composites core using analytical method

The axial flux permanent magnet (AFPM) machines are widely applied in various industrial settings in recent years, because of high energy density, high efficiency and compact construction as compared with other conventional radial flux permanent magnet (RFPM) machines.

Characteristic analysis and experimental verification of generating performance in double-sided permanent magnet synchronous linear generator considering three-dimensional effects for ocean wave energy converter

For generating performance analysis and experimental verification of a double-sided permanent magnet linear synchronous generator (PMLSG) with a slotless stator as shown in Fig. 1(a), this paper utilized a three-dimensional (3D) analysis method and manufactured model.

Analysis of Eddy Current Loss in Permanent Magnet Linear Synchronous Generator Considering Tapped Holes in Movers Using Semi-3-D Analytical Method

This paper describes the analysis of the eddy current loss of a double-sided cored slotless-type permanent magnet linear synchronous generator considering tapped holes in mover magnets using the space harmonic method. To calculate the eddy current, an analytical solution was derived by applying the Maxwell’s equation, magnetic vector potential, and Faraday’s law in a 2-D Cartesian coordinate system. Based on the armature reaction field distribution produced by the armature winding current, we obtained an analytical solution for the eddy current density distribution. Then, an analytical solution for eddy current loss induced in a permanent magnet (PM) was derived using the equivalent electrical resistance calculated from the PM’s volume and eddy current density distribution solution. Finally, the resulting current was determined based on the analysis of eddy current loss. The analytical results produced by using this application of the space harmonic method were validated extensively through comparisons with finite-element method results.

Comparative study and experiment of a double-sided permanent magnet linear synchronous generator according to magnetization pattern

This paper presents a comparison of efficiency and mover mass on a double-sided permanent magnet linear synchronous generator (PMLSG) according to its magnetization pattern. When a PMLSG has a lighter mover, it has advantages such as lower cost and other aspects regarding mechanical losses. In general, PMLSGs are used with a vertical PM pattern, but we propose a horizontal PM pattern in this paper because the horizontal PM mover does not need a back-iron for the magnetic path. Electromagnetic field analysis is especially essential when analyzing the characteristics of PMLSGs. For this type of analysis, commercial finite element analysis tools are widely used because they offer convenient user interfaces that provide very accurate analytical results. Based on two-dimensional finite element analysis, we got results for two different patterns and compared them with our experimental results. Finally, the results of this analysis and the test results obtained confirm the validity of the model and the superiori...

Eddy current loss in double-sided cored slotless type permanent magnet linear synchronous generator using analytical method

This paper describes the eddy current loss analysis of a double-sided cored slotless-type permanent magnet linear synchronous generator using the space harmonic method. To calculate the eddy current, an analytical solution was derived by applying the Maxwell equation, magnetic vector potential, and Faraday’s law in a two-dimensional (2-D) Cartesian coordinate system. Based on the armature reaction field distribution produced by the armature winding current, we obtained an analytical solution for the eddy current density distribution. Then, an analytical solution for eddy current loss induced in a permanent magnet (PM) was derived using the equivalent electrical resistance calculated from the PM’s volume and eddy current density distribution solution. Finally, the resulting current was determined based on analysis of the eddy current loss. The analytical results produced using this application of the space harmonic method were validated extensively through comparison with finite element method results.

Torque characteristic analysis and measurement of axial flux-type non-contact permanent magnet device with Halbach array based on 3D analytical method

This paper addresses the torque characteristic analysis of an axial flux-type non-contact permanent magnet device with a Halbach magnet array using a 3D analytical method based on transfer relations. We obtain the magnetic field distribution due to the permanent magnet. The magnetic torque is derived from the magnetic field using a Maxwell stress tensor. The analytical results are validated extensively by comparison with 3D finite element analysis. Therefore, we derive an accurate analytical solution to reduce the analysis time, and we present an experimental verification using a manufactured model.This paper addresses the torque characteristic analysis of an axial flux-type non-contact permanent magnet device with a Halbach magnet array using a 3D analytical method based on transfer relations. We obtain the magnetic field distribution due to the permanent magnet. The magnetic torque is derived from the magnetic field using a Maxwell stress tensor. The analytical results are validated extensively by comparison with 3D finite element analysis. Therefore, we derive an accurate analytical solution to reduce the analysis time, and we present an experimental verification using a manufactured model.

Optimal design and torque analysis considering eddy-current reduction of axial-flux permanent magnet couplings with Halbach array based on 3D-FEM

This paper deals with torque parametric analysis of axial-flux magnetic coupling with Halbach array magnetized permanent magnet using the 3D finite element method (FEM). We have proposed a design method for the axial flux permanent magnet coupling (AFPMC). AFPMC is manufactured on the basis of parametric analysis result. Finally, this paper presents some methods to reduce eddy current loss. The results are compared with those obtained from 3D FEM.

Eddy Current Loss Analysis of Slotless Double-sided Cored Type Permanent Magnet Generator by using Analytical Method

This paper deals with eddy current loss analysis of Slotless Double sided Cored type permanent magnet linear generator by using analytical method, space harmonic method. In order to calculate eddy current, this paper derives analytical solution by the Maxwell equation, magnetic vector potential, Faraday’s law and a two-dimensional(2-D) cartesian coordinate system. First, we derived the armature reaction field distribution produced by armature wingding current. Second, by using derived armature reaction field solution, the analytical solution for eddy current density distribution are also obtained. Finally, the analytical solution for eddy current loss induced in permanent magnets(PMs) are derived by using equivalent, electrical resistance calculated from PMs volume and eddy current density distribution solution. The analytical result from space harmonic method are validated extensively by comparing with finite element method(FEM).