• Proceedings of the KIEE Conference
• /
• 2011.07a
• /
• pp.1091-1092
• /
• 2011

영구자석형 발전기는 외부의 여자 전원이 필요 없어서, 비상 전원으로 뿐 아니라, 소형 발전설비에서의 발전기의 여자 전원으로도 사용될 수 있다. 특히, 내삽형 영구자석형 동기발전기는 자석보다 극의 자속밀도를 더 높일 수 있어, 저가, 고성능 발전기 제작이 가능하다. 본 연구에서는 이러한 발전기에 필요한 발전기 해석기술을 개발한다. 정밀 해석을 위한 등가회로를 모델링하고, 이로부터 해석적인 결과를 얻는다. 전기자 저항을 고려한 경우와 고려하지 않은 경우를 비교하여 해석의 타당성을 검증한다.

• Proceedings of the KIEE Conference
• /
• 2006.10d
• /
• pp.83-85
• /
• 2006

In this paper, the dynamic characteristic according to variable load of Permanent magnet Linear Synchronous Motor(PMLSM) is dealt with carefully. And the experiment machine is manufactured for analysis of dynamic characteristic. The results of both simulation and experiment are discussed.

• Proceedings of the KIEE Conference
• /
• summer
• /
• pp.761-763
• /
• 2004

Due to the high peripheral speed of the rotor and the relatively high conductivity of the magnets used, rotor eddy current loss can be substantial. On the basis of the coupled FEM and analytical method, this paper deals with the rotor loss analysis in permanent magnet high-speed machine with 3-phase rectifier.

• Proceedings of the KIEE Conference
• /
• 2009.04b
• /
• pp.73-75
• /
• 2009

매입형 영구자석 동기 전동기(IPMSM)은 다른 타입의 기기들 보다 많은 고조파 자속밀도 성분들을 가진다. 그러므로, 고속 영역에서의 고조파 철손을 계산하는 것은 그만큼 중요하다. 본 논문은 구동 조건을 고려한 IPMSM의 철손을 해석하였다.

• Proceedings of the KIEE Conference
• /
• 2001.10a
• /
• pp.9-11
• /
• 2001

This paper deals with design and characteristic analysis of a permanent magnet linear synchronous motor for magnetic levitation stage of semi-conductor manufacture machine. In order to improve the control performance by detent force minimization, skew and PM offset method are used.

• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.61 no.2
• /
• pp.216-222
• /
• 2012

Newly proposed RG-MADS (Randomly Guided Mesh Adaptive Direct Search) has been applied to the optimal design of Interior Permanent Magnet Synchronous Motor (IPMSM) which has the distinctive features of magnetic saturation. RG-MADS, advanced from classical MADS algorithm, has the superiority in computational time and reliable convergence accuracy to the optimal solution, thus it is appropriate to the optimal design of IPMSM coupled with time-consuming Finite Element Analysis (FEA), necessary to the nonlinear magnetic application for better accuracy. Effectiveness of RG-MADS has been verified through the well-known benchmark-functions beforehand. In addition, the proposed RG-MADS has been applied to the optimal design of IPMSM aiming at maximizing the Maximum Torque Per Ampere (MTPA), which is regarded as representative design goal of IPMSM.

• Journal of international Conference on Electrical Machines and Systems
• /
• v.2 no.4
• /
• pp.399-404
• /
• 2013

The rotor overhang is used to enhance air-gap flux and improve power density. Due to asymmetry in the axial direction caused by the overhang, the time consuming 3D analysis is necessary to design the motor with overhang. To solve this problem, this paper proposes the equivalent magnetic circuit model (EMCM) that can consider overhang effects without the 3D analysis by using effective air-gap length. The analysis time can be reduced significantly via the proposed EMCM. The reduction of the analysis time is essential for the preliminary design of the motor. In order to verify the proposed model, the 3-D finite-element method (FEM) analysis is adopted. 3-D FEM results confirm the validity of the proposed EMCM.

• The Transactions of the Korean Institute of Electrical Engineers B
• /
• v.53 no.3
• /
• pp.152-163
• /
• 2004

This paper presents a sensorless speed control of cylindrical permanent magnet synchronous motors(PMSM) using an adaptive integral binary observer In view of composition with a main loop regulator and an auxiliary loop regulator, the binary observer has a property of the chattering alleviation in the constant boundary layer. However, the steady state estimation accuracy and robustness are dependent upon the width of the constant boundary. In order to improve the steady state performance of the binary observer, the binary observer is formed by adding extra integral dynamics to the switching hyperplane equation. With the help of integral characteristic, the rotor speed can be finely estimated and utilized for a sensorless speed controller for PMSM. Since the Parameters of the dynamic equations such as machine inertia or a viscosity friction coefficient are lot well known, there are many restrictions in the actual implementation. The proposed adaptive integral binary observer applies an adaptive scheme so that observer may overcome the problem caused by using the dynamic equations and the rotor speed is constructed by using the Lyapunov function. The observer structure and its design method are described. The experimental results of the proposed algorithm are presented to demonstrate the effectiveness of the approach.

• Journal of Electrical Engineering and Technology
• /
• v.4 no.2
• /
• pp.240-248
• /
• 2009

An approach to control the position for an interior permanent magnet synchronous motor (IPMSM) based on an adaptive integral binary observer is described. The binary controller with a binary observer is composed of a main loop regulator and an auxiliary loop regulator. One of its key features is that it alleviates chatter in the constant boundary layer. However, steady state estimation accuracy and robustness are dependent upon the thickness of the constant boundary layer. In order to improve the steady state performance of the binary observer and eliminate the chattering problem of the constant boundary layer, a new binary observer is formed by adding extra integral dynamics to the existing switching hyperplane equation. Also, the proposed adaptive integral binary observer applies an adaptive scheme because the parameters of the dynamic equations such as the machine inertia and the viscosity friction coefficient are not well known. Furthermore, these values can typically be easily changed during normal operation. However, the proposed observer can overcome the problems caused by using the dynamic equations, and the rotor position estimation is constructed by integrating the rotor speed estimated with a Lyapunov function. Experimental results obtained using the proposed algorithm are presented to demonstrate the effectiveness of the approach.

• Journal of Power Electronics
• /
• v.18 no.5
• /
• pp.1369-1379
• /
• 2018

In this paper, a model predictive torque control (MPTC) without the use of a weighting factor for surface mounted permanent-magnet synchronous machine (SPMSM) drive systems is presented. Firstly, the desired voltage vector is predicted in real time according to the principles of deadbeat torque and flux control. Then the sector of this desired voltage vector is determined. The complete enumeration for testing all of the feasible voltage vectors is avoided by testing only the candidate vectors contained in the sector. This means that only two voltage vectors in the sector need to be tested for selecting the optimal voltage vector in each control period. Thus, the calculation time can be reduced when compared with the conventional enumeration method. On the other hand, a novel cost function that only includes the dq-axis voltage errors between the desired voltage and candidate voltage is designed to eliminate the weighting factor used in the conventional MPTC. Thus, the control complexity caused by the tuning of the weighting factor is effectively decreased when compared with the conventional MPTC. Simulation and experimental investigation have been carried out to verify the proposed method.