유정훈 교수

The homogenization design method (HDM) is extended to obtain an optimal topology of magnetic fields. This is accomplished by maximizing the magnetic mean compliance in a given region of the device. HDM is applied to a three-dimensional case, taking into account the saturation effect of the material. Results show that HDM is valid to maximize the vector potential and the magnetic energy. This method can also be applied to increase the performance of motors and antennas.

To improve the performance of electric machinery, it is necessary to obtain the optimal topology of a structure in magnetic fields. The homogenization design method is applied to obtain the optimal topology. In the method, the change of inner hole size and rotational angle of unit cell determines the optimal material distribution in a design domain and this distribution defines an optimal topology. The objective function is defined as maximizing magnetic mean compliance (MMC). This is the same a

This study suggests a concept design for an electromagnetic (EM) coupler, using the topology optimization method. To maximize the force generated by magnetic flux, the magnetic energy generated must be differentiable, at the location where the force is acting, in a prescribed force direction. This study proposes a topology optimization scheme for maximizing the force in a specific direction, using a commercial analysis program, ANSYS, to provide the force value. We use ANSYS for obtaining the re

The electrostatic chuck (ESC) offers several advantages compared with mechanical holding systems because it can hold a flat object, resulting in flattening of semiconductor wafers and liquid-crystal display (LCD) panels without surface contamination and particle generation. This research tries to compute the attractive force between the Coulomb type ESC and the LCD panel using the finite element (FE) analysis and confirms the influence of the air gap upon the attractive force. The air gap exists

Summary In this study, a multimaterial topology optimization method using a single variable is proposed by combining the solid isotropic material with penalization method and the reaction‐diffusion equation. Unlike ordinary multimaterial optimization, which requires several variables depending on the number of material types, this method intends to represent various materials as one variable. The proposed method combines two special functions in the sensitivity analysis of the objective function

This dissertation is purposed to study the optimal topology design of structures in magnetic fields using the homogenization design method. The applications are classified into two parts: frequency response optimization of a structure which is excited by magnetic forces and magnetic energy optimization of a structure to maximize the magnetic energy/vector potential. For the topology optimization of a structure using the homogenization design method, the accuracy of the finite element analysis is