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[전기기기] 공간고조파해석 기법을 이용한 웨어러블 로봇용 SPMSM 설계
임명섭(Myung-Seop Lim) 대한전기학회 2019 전기학회논문지 Vol.68 No.5
This paper discusses the analytical design method of a 125W surface-mounted permanent magnet synchronous motor (SPMSM) as an actuator for an exoskeleton wearable robot. Considering the properties of the wareable robot application, pole and slot combination is determined to minimize vibration as well as cogging torque. In addition, the shape of the magnetic core and permanent magnets are determined by using the analytical approaches including space harmonic analysis (SHA) to maximize torque density as well as minimize cogging torque and torque ripple, simultaneously. As a result, the SPMSM which has high torque density with small axial length, low cogging torque/torque ripple and a large hollow rotor is designed.
돌극성 기반의 센서리스 제어가 가능한 EV 구동용 집중권 IPMSM의 극 수-슬롯 수 조합에 대한 연구
임명섭(Myung-Seop Lim),채승희(Seung-Hee Chai),홍정표(Jung-Pyo Hong) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
This paper presents the decision process of pole-slot number combination for a saliency-based sensorless controlled interior permanent magnet synchronous motor(IPMSM) with concentrated winding for EV traction. To figure out the machine characteristics of noise and vibration, the equation about the force order(noise and vibration order) and the simulation results of the radial force are shown. Furthermore, it is suggested that calculating procedure for the changing pattern of d, q-axis inductance profiles varied with rotor position converted from the 3-phase inductances including harmonics to evaluate sensorless drive feasibility. Lastly, 115Nm-14kW 16-pole/24slot sensorless-oriented IPMSM model which is designed based on the decision process is proposed. The validity of the sensorless controlled prototype and the decision process are verified showing the d, q-axis inductance profiles of the machine under the maximum load condition.
2D Scale factor를 이용한 EV 구동용 모터의 다목적 최적설계
임재연(Jae-Yeon Lim),김대기(Dae-Kee Kim),차경수(Kyoung-Soo Cha),신선용(Sun-Yong Shin),임명섭(Myung-Seop Lim),심호경(Ho-Kyung Shim) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.11
본 논문에서는 강성을 만족하는 전기차(Electirc Vehicle, EV) 구동용 모터를 설계하기 위해 2D Scale factor를 고려하여 크리깅 대체모델 기반의 최적설계를 진행 하였다. 민감도 분석을 통해 모터의 토크, 효율, 강성에 유의미한 영향이 있는 최적설계변수를 선정했다. 최적설계변수에 대해 Optimal Latin Hypercube Sampling(OLHS) 와 유한요소해석 (Finite Element Analysis, FEA)를 수행하여 크리깅 대체모델(Kriging Surrogate Model)을 생성하였다. 크리깅 대체모델을 이용하여 목표 토크와 최대응력 제한치를 만족하고 부피를 최소화, 효율을 최대화하기 위한 최적설계를 수행함으로써 EV 구동에 적합한 모터를 설계하였다.
Bar Winding을 사용한 EV용 IPMSM의 AC 저항 저감을 위한 고정자 최적 설계
임재연(Jae-Yeon Lim),차경수(Kyoung-Soo Cha),박수환(Soo-Hwan Park),김재현(Jae-Hyun Kim),임명섭(Myung-Seop Lim) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
Bar winding is widely applied to EV traction motors because of its high fill factor. However, bar winding causes AC resistance to increase due to its large cross-sectional area of the conductor. For high efficiency, AC resistance must be reduced. Therefore, this paper proposes a stator optimal design method for EV traction motors to reduce AC resistance. First, the design factors which affect the output power and efficiency of the motor are determined by the analysis of variance. Next, the experimental points are determined by using Latin hypercube sampling, and use a Kriging surrogate model to proceed with the optimal design. As a result, we compare the efficiency of the target motor and the optimal design motor calculated through finite element analysis.
퍼스널 모빌리티용 탈희토류 영구자석 동기모터 최적 설계
김기오(Ki-O Kim),임명섭(Myung-Seop Lim),박두하(Du-Ha Park),박지원(Ji-Won Park),최명균(Myeong Gyun Choi),최윤용(Yunyong Choi) 한국자기학회 2023 韓國磁氣學會誌 Vol.33 No.6
This paper presents the optimal design of a 15 kW permanent magnet synchronous motor for personal mobility using non-rare earth permanent magnets (PMs) as an alternative to neodymium PMs. The characteristics of neodymium permanent magnet motors are compared with those when replaced with ferrite permanent magnets, and methods for improvement are suggested. The electromagnetic performance according to the rotor outer diameter, the shape of the PM, and the number of layers of the PM are compared, and the initial design is carried out considering the irreversible reduction characteristics and mechanical stability. Considering that it is for personal mobility, the efficiency of the main operating points for urban driving is considered, and two-step optimization is performed to reduce the number of experimental points. Based on the optimal design results of this paper, the suitability of synchronous motors using rare earth permanent magnets for personal mobility is suggested.
교번 적층된 비대칭 Ribless 모터의 2D FEA 기반 특성 예측 방법
홍영진(Yeong-Jin Hong),윤명환(Myung-Hwan Yoon),임명섭(Myung-Seop Lim) 한국자동차공학회 2024 한국자동차공학회 부문종합 학술대회 Vol.2024 No.6
The rotor of an interior permanent magnet synchronous motor(IPMSM) has ribs which a structure between the air gap and the air barrier. The shape of ribs affect the electromagnetic and mechanical performance of the IPMSM. These two performances are inversely proportional depending on the thickness of the rib. The asymmetric ribless structure with alternating stacked rotor was made to solve this problem. This structure has the advantage of being able to improve electromagnetic performance while minimizing the amount of magnet flux leaked, and mechanically securing structural stability. However, due to the nature of the asymmetric structure, 3D finite element method(FEA) is required and there is a disadvantage that it takes a long time to interpret. This paper proposed the asymmetric ribless rotor with alternating stacked structure, and performed 2D FEA reflecting the characteristics of the alternating stacked structure to reduce the analysis time.
Ferrite 영구자석을 적용한 EV 구동용 IPMSM의 전기적, 기계적 특성 연구
김기오(Ki-O Kim),정영훈(Young-Hoon Jung),박민로(Min-Ro Park),임명섭(Myung-Seop Lim) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
Recently, because of the instability of rare-earth resource supply and demand, research on rare-earth free in various fields is urgent. Accordingly, studies are being actively conducted to apply ferrite permanent magnet to IPMSM (Interior Permanent Magnet Synchronous Motor) used as electrical vehicle (EV) traction motors. Ferrite permanent magnet is cheap and easy to obtain. However, it has lower coercive force values than rare earth permanent magnets, and there is a large armature reaction occurs during EV motor operation, it is necessary to check for irreversible demagnetization. In addition, the limited space of the vehicle requires a high power density of the motor. In order to satisfy the high power density, the motor must be speeded up. Therefore, the problem of mechanical stiffness due to the generation of very large centrifugal force must also be considered. In this paper, the irreversible demagnetization characteristics and mechanical stiffness of IPMSM with ferrite permanent magnet. When determining the rotor shape, the sensitivity of each performance is analyzed through of variance of design factors. Sensitivity analysis is based on the maximum stress of the rotor and irreversible demagnetization characteristics. P-value less than 0.05 can be used as major design factors in motor design by determining sensitivity factors for each performance.
에너지 효율 향상을 위한 연료전지차용 공기압축기 초고속 모터의 최적 설계
김동민(Dong-Min Kim),김재현(Jae-Hyun Kim),임명섭(Myung-Seop Lim) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.7
본 논문은 연료전지차용 공기압축기의 초고속 모터 최적 설계에 관한 내용이다. 기계적 강성과 전원 사양을 만족하면서 최대 속도에서의 효율을 중심으로 설계된 모델을 베이스 모델로 하였다. 이로부터 에너지 효율 최적화를 위하여 먼저 연료전지차의 실 주행 데이터로부터 속도별 웨이팅을 산정하였다. 또한 부하 별 전류 THD 변동을 반영하기 위하여 인버터시뮬레이션을 구성하여 부하 시 전류 파형을 예측하여 손실 해석에 반영하였다. 최적 설계는 먼저 분산 분석을 통하여 전류 THD에 영향이 큰 설계 변수를 선정하였다. 선정된 변수들로부터 Latin Hypercube Sampling 기법을 이용하여 실험점을 배치하였고 실험점에 대한 반응으로부터 대체모델을 생성하여 최적화하였다.