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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.
수소 전기차 공기압축기용 초고속 모터의 PWM 고조파 전류에 대한 온도 특성 예측
임소연(So-Yeon Im),박수환(Soo-Hwan Park),김재현(Jae-Hyun Kim),임명섭(Myung-Seop Lim) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
The fuel cell electric vehicle’s air compressor is driven by an ultra-high-speed(UHS) surface-mounted permanent magnet synchronous motor(SPMSM). UHS SPMSM has a large electromagnetic losses due to high rotational speed. Motor losses increase the temperature inside the motor. Increased motor temperature can cause deterioration in motor performance. In addition, since the motor is driven by an inverter, pulse width modulation(PWM) harmonic current is input to the motor. Since the PWM harmonic current increases the electromagnetic losses of the motor, it is necessary to analyze the effect of the PWM harmonic current on the temperature distribution of the motor. In this paper, the inverter simulation is conducted to predict the PWM harmonic current waveform, and the temperature distribution of the motor due to the PWM harmonic current is predicted through the lumped parameter thermal network (LPTN).
So-Yeon Im(임소연),Jae-Hyun Kim(김재현),Moo-Hyun Sung(성무현),Myung-Seop Lim(임명섭) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
Since the motor is driven by an inverter, it is essential to design the motor in consideration of electrical specifications. The DC link voltage limits the fundamental armature voltage of the motor. Ultra-high-speed motors have large voltage drop due to inductance. In order to satisfy the voltage-limit condition, a permanent magnet (PM) overhang structure can be considered to reduce the inductance voltage drop. Since back-electromotive force (EMF) increases when the PM overhang structure is applied, the stack length may be reduced at the same level as back-EMF. Accordingly, the inductance voltage drop is reduced due to the reduction of the stack length. In particular, since surfaced-mounted synchronous motor (SPMSM) does not generate reluctance torque, the same output torque can be maintained even when the inductance is reduced through a PM overhang structure. The PM overhang factor is used to reduce the computation time by reflecting the effect of the PM overhang structure in the 2-dimensional finite element analysis. Accordingly, the distributed winding SPMSM is designed to reduce the inductance by reflecting the PM overhang factor.
SBW 반력 장치용 모터의 코깅 토크, 토크 리플 및 전자기력 고조파 저감을 위한 회전자 형상에 따른 비교 연구
원윤재(Yun-Jae Won),안수민(Soo-Min Ahn),김재현(Jae-Hyun Kim),임명섭(Myung-Seop Lim),김두영(Doo-Young Kim) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
In this paper, the development of steering system and SBW (Steer by wire) system are introduced. Also, designs for reducing cogging torque, torque ripple and electromagnetic force harmonics that affect vibration in the motor for reaction force device used in the system of SBW are studied. In addition, according to rotor shape, three types of motors are designed to reduce vibration considering the same design specifications. First, it is designed as a SPMSM (Surface-mounted permanent magnet synchronous motor) type that is advantageous in terms of control. Second, it is designed as an IPMSM (Interior permanent magnet synchronous motor) type advantageous for power density. Third, in order to reduce the use of permanent magnets, it is designed as a CP-PMSM (Consequent pole permanent magnet synchronous motor) type. Using the FEA (Finite Element Analysis), the design parameters that affect cogging torque, torque ripple and electromagnetic force harmonics are identified. Then, the optimal design is carried out by selecting the objective function and constraint conditions. The optimal design result based on the surrogate model depends on how well the surrogate model simulates the performance. Therefore, in the optimal design, an surrogate model is created using the kriging method, and the predicted performance is verified to match the true value. Finally, the performance of these three types of motors is compared to suggest a motor type suitable for SBW.
파라메트릭 디자인을 이용한 듀얼 클러치 변속기용 자속집중형 동기 전동기 설계
정영훈(Young-Hoon Jung),박권일(Kwon-Il Park),임명섭(Myung-Seop Lim),홍정표(Jung-Pyo Hong) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
This paper proposes a design process of the Concentrated Flux type Synchronous Motor (CFSM) satisfying the same performance of the conventional Surface-mounted Permanent Magnet Synchronous Motor (SPMSM). The rotor shape producing the maximum air-gap flux is determined under the same volume condition and the radius of rotor is increased to satisfy the same air-gap flux of the conventional motor. The radius of rotor is determined by parametric design. The width of teeth and yoke is recalculated considering saturation of the stator after the rotor is designed. The joint of the rotor that is composed of the magnetic core and non-magnetic part is designed by parametric design. Finally, the characteristics of the designed CFSM is compared with those of the SPMSM.