Chang-Eob Kim

The Analysis of Permanent Magnet Double-Sided Linear Synchronous Motor With Perpendicular Arrangement

In this paper, a new linear synchronous motor—permanent magnet double-sided linear synchronous motor with perpendicular arrangement (PMDLSM), was proposed. This motor was designed to account for the drawbacks of conventional linear motors, such as the problems with normal force and end effects. It was designed by analyzing the detent force and the thrust of different models, and optimizing the design variables of the machine. The characteristics of the perpendicular PMDLSM were analyzed by finite element method, and a comparison of the results was made in the experiments.

Minimization of detent force of perpendicular PMDLSM using response surface method and finite element method

This paper presents an optimum design of perpendicular PMDLSM (Permanent Magnet Double-sided Linear Synchronous Motor with Perpendicular Arrangement) to minimize the detent force. The optimum method uses response surface method and 3D finite element method. The design variables of the machine are the primary core width and thickness, and magnet width, thickness and length. Object function is to minimize the detent force while maintaining the thrust of the basic model. Our results showed that the thrust force of the optimum design increased by 8.1[N] and the detent force decreased by 12.4[N], which are 9.9% increase and 81.6% decrease, respectively.

The Electric Field Analysis of 2[MVA] Mold Transformer Considering the Void Effect in the Insulating Material

This paper presents the electric field analysis for 2[MVA] mold transformer using finite element method. The electric field was calculated for the voltage applied to the mold transformer without voids in the insulating material. Then, it was analysed the maximum electric field when the voids was in the insulating materials. And the starting voltage of partial discharge was predicted due to the voids. The effects of voids in epoxy resin on the electric field were investigated for different sizes, shapes, positions and arrangements of voids.

Design of an Electromagnetic Pump and Numerical Analysis of the Liquid Metal Flow

An electromagnetic pump has been designed using Load Distribution Method and Equivalent Circuit Method, and installed in a liquid metal flow system. The relation between the driving power of he electromagnetic pump and the flow rate was proposed. Also, the flow velocity and flow rate has been calculated by treating the Lorentz force as a source term in the Navier-Stokes equation. The calculation results were analyzed and compared with data from a commercial Code, FLUENT. They agreed well with each other within an error of 5%.

An optimum design of tunnel actuator for performance improvement

This thesis compares the advantages and disadvantages of the Tunnel Actuator and those of the existing linear motors. Then, an optimum design method for performance improvement was proposed, and an optimal design to maximize the thrust of the tunnel actuator was made by using 3D finite elements method and response surface method.

Investigation of Simulation and Measuring Algorithm of Partial Discharge for Diagnosis of Electric Machinery Deterioration

This paper proposes a new intelligent diagnosis equipment for the partial discharge, which keeps deteriorating the insulating materials inside electric machineries, ultimately leading to electrical breakdown. In order to simulate experimentally the partial discharge inside the electric machinery, the tip-to-plate, the sphere-to-plate, the sphere-to-sphere and the plate-to-plate electrodes are used respectively, of which the gaps are 1[mm], 3[mm] or 5[mm] and the applied voltages are 3[kV], 5[kV] or 7[kV]. Ceramic coupler sensor and FIR digital filter are used to measure the partial discharge and the artificial neural network is used for the deterioration diagnosis of the electric machinery. The microprocessor of PD diagnosis equipment is DSP (TMS320C6713) with FPGA (Cyclone II). The results of the real-time and on-line experiments performed with the developed equipment are also explained.

An Optimum Design of Axial Flux Permanent Magnet Machine for Wind Generator to Reduce the Cogging Torque

Among the wind power generators, the axial permanent magnet generator has an advantage for increasing the power per unit volume compared to the existing radial flux generator. In this study, we calculated the cogging torque for the shapes of the permanent magnet and the stator pole in an axial permanent magnet generator, and studied the method to minimize the cogging torque. At a first step, several optimum shapes were obtained by using the response surface method. Next, the cogging torques were calculated by using finite element method and finally the optimum design was obtained to minimize the cogging torque of the generator. The analysis model was three phase 1kVA wind power generation having 24 poles and 18 slots. As a result of the optimum design, the cogging torque decreased by 7.37N?m and the EMF increased by 25.63V compared to the basic model.

The influence of stator pole shape and its arrangements on cogging torque for double-sided AFPM generator

In this paper, the cogging torques were calculated for 1 kw double-sided axial flux permanent magnet (AFPM) generator with different stator core pole arrangements. The generator is composed of 18 stator pole and 24 rotating field magnets on each side. The cogging torques of the generator with three types of arrangements of stator poles were calculated using 3D finite element method and the optimum core shape was determined to minimize the cogging torque.

Comparison of ECT Probes in Diagnosis of Defects

In this paper, the characteristics of a defective elliptical aluminum plate are analyzed by three different eddy current testing probes; T/R, T/T, and Impedance probes. The analysis was done by 3D finite element method, and the impedance change of real and imaginary voltage values were analyzed.

Design and Analysis of Permanent Magnet Double-Sided Linear Synchronous Motor with Perpendicular Arrangement

In this paper, a new linear synchronous motor - permanent magnet double-sided synchronous motor with perpendicular arrangement (PMDLSM), was proposed. It was designed to account for the drawbacks of conventional linear motors, such as the normal force and end effects. The detent force and the thrust were analyzed for different combinations of primary core modules and magnet poles of the machine, and the optimum combination was made. The characteristics of the perpendicular PMDLSM were analyzed by finite element method, and the experiments agreed well with the analysis.