• Journal of Electrical Engineering and Technology
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• 제6권5호
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• pp.618-625
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• 2011

This paper presents a double excited three degree-of-freedom (3DOF) motor. The proposed 3DOF motor is designed with a laminated structure, making it easy to manufacture. In addition, it has windings on the stator and rotor, and does not require an expensive permanent magnet. We explain the structure, principle of motion, and design of the proposed motor, and perform an analysis of the static characteristics using the two- and three-dimensional finite element methods (3D FEM). The feasibility of 3D FEM analysis is confirmed by comparing the 3D FEM analysis and experimental results for the rolling and pitching motion. We also confirm the occurrence of holding torque in every motion.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2004년도 추계학술대회논문집
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• pp.490-493
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• 2004

A 3-DOF actuator which has new principle and very simple structure is proposed. Its principle seems to be similar to conventional electromagnetic actuators, that is, to utilize the relation of control and bias fluxes produced by coils and permanent magnets, respectively, but the coils and permanent magnets of the proposed actuator are fixed in the stator. Such a structure helps to optimally design the actuator for its use. Some experimental and FEM analysis results show the feasibility of the proposed actuator and some characteristics of system that are useful lot structure design and control.

• 전기학회논문지
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• 제66권2호
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• pp.315-322
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• 2017

This study presents a novel two­phase eight stator poles and six rotor poles (8/6) switched reluctance machine (SRM) that can compensate for the vibration and noise problems of two­phase 6/3 SRM and compare the characteristics of two SRMs. In the case of two­phase 6/3 SRM, the short flux path and the flux direction inside the stator are not reversed, so they have high efficiency characteristics. However, the use of three rotor poles causes problems of vibration and noise because the radial force applied to the rotor poles is not balance. The proposed two­phase 8/6 SRM has advantages of 6/3 SRM such as the flux­reversal­free stator and it can improve vibration and noise by using six rotor poles due to balanced radial force acting on the rotor poles. In order to make a reasonable comparison between two SRMs, the electromagnetic field structure of 8/6 SRM is designed to have equivalent torque characteristic to 6/3 SRM and then the copper loss and core loss are compared and analyzed. Finally, we compare the effieicney of two SRMs using finite element analysis and compare the distribution of radial force acting on the rotor poles based on Maxwell's stress method.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 B
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• pp.703-705
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• 2002

The actuator consists of winding as a stator and mover includes permanent magnet. The Linear Oscillatory Actuator(LOA) has very few components and a highly simplified structure, and therefore promises to be simple and reliable. In this paper, LOA was designed and manufactured. before design and manufacture, characteristic of thrust was analyzed using FEA. LOA was manufactured according to design specification.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.859-861
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• 2001

The Linear Oscillatory Actuator(LOA) has very few components and a highly simplified structure, and therefore promises to be simple and reliable. The actuator consists of winding as a stator and mover includes permanent magnet. In this paper, LOA was designed and manufactured, before design and manufacture, characteristic of thrust was analyzed using FEA, LOA was manufactured according to design specification.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.659-660
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• 2015

본 논문에서는 자동차 전장용 3상 BLDC 전동기의 출력특성 향상을 위해 비대칭 공극 구조 설계 방법에 대해 연구하였다. SPM 타입 BLDC 전동기의 공극을 비대칭적으로 설계함으로써 자기적 토크 외에도 릴럭턴스 토크가 발생하게 된다. 따라서 전류 당 토크의 증가로 인해 출력특성을 향상시켰으며 2D 유한요소해석을 통해 본 논문의 타당성을 검증하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 A
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• pp.269-271
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• 1998

Reluctance Synchronous Motors(RSM) with new rotor shape are considered in this paper. Since the stator of a RSM is similar as that of an induction motor, attention is focused here on the rotor structure. We have designed the parameter of RSM and analyzed the characteristics of the electromagnetic energy conversion.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 춘계학술대회논문집B
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• pp.607-612
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• 2001

Rotary ultrasonic motors are based on the traveling wave generated by piezo materials attached on the stator. Large scale model of an annular ring was built to understand the fundamental mechanism involved in the rotary ultrasonic motors. Traveling wave on the structure can be generated by superposing two standing waves. Precise matching of the amplitudes and phase shift between two standing waves in time and space is the key to the success of generating a traveling wave.

• Journal of Electrical Engineering and Technology
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• 제12권3호
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• pp.1219-1226
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• 2017

This paper presents the hybrid stepping machine for linear oscillating generators. The focus of the work is the suggestion of the improved model through the comparison of proposed models ; new flux concentrating PMs mover of the hybrid stepping generator is proposed based on the symmetrical and non-symmetrical stator cores of the surface mounted PMs mover, and non-slanted PMs and slanted PMs of the flux concentrating PMs mover. It is achieved using equivalent magnetic circuit considering leakage elements. Finally, this study suggests new hybrid stepping structure of linear oscillating generator.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.2365-2372
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• 2011

BLDC 모터와 같은 동기전동기에서 소음과 진동의 원인이 되는 코깅토크는 전동기내의 비 균일 토크로서 전동기 시스템의 자기 에너지가 최소인 위치로 이동하려는 접선방향의 힘으로 부하전류와 상관없이 회전자 영구자석과 고정자 슬롯의 상호작용에 의해 발생한다. 이러한 코깅토크는 전동기의 소음과 진동의 주요 원인이 되므로 전동기 설계 시 반드시 고려해야 한다. 코깅토크는 영구자석이 부착된 회전자에 의하여 공극 중에 비교적 저차의 고조파 자속밀도와 고정자 철심 슬롯의 상호작용으로 발생한다는 점을 중시하여 본 논문에서는 실험계획법의 일종인 반응표면 법을 사용하여 코깅토크를 저감하는 방법에 대해 제시하였다.