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매입형 영구자석 동기기의 PWM 전류 고조파를 고려한 철손 및 시스템 효율 분석
배예나(Ye-Na Bae),김현수(Hyun-Su Kim),유준열(Jun-Yeol Ryu),박진철(Jin-Cheol Park),임명섭(Myung-Seop Lim),채승희(Seung-Hee Chai) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
Large-capacity batteries are applied to vehicles to improve the mileage of electric vehicles. However, increasing the capacity of the battery degrades the heating and cooling characteristics of the motor-inverter system. The increase in heat generation of the motor-inverter system causes a decrease in efficiency and a decrease in acceleration and deceleration performance of the vehicle driving system. Therefore, design and control for a high-efficiency motor-inverter system is required, and for this purpose, it is necessary to accurately predict the efficiency of each component. In this paper, we analyze the loss of a motor in consideration of the harmonic current (Pulse Width Modulation current harmonic) caused by inverter switching action, and propose a method to predict the efficiency of the motor-inverter system. For the loss of the motor, DC and AC copper losses and iron losses were considered, and mechanical losses were ignored. The loss of the inverter takes into account the conduction loss and the switching loss. And by comparing this with the motor loss at the sinusoidal current, it was confirmed that the proposed method was similar to the actual trend. Additionally, we calculated PWM current harmonics according to switching frequency and analyzed trends in motor efficiency and system efficiency. Through this, the necessity and validity of predicting motor loss and system efficiency in consideration of PWM current harmonics were verified.
김승현(Seung Hyun Kim),김동욱(Dong Wook Kim),이도엽(Do Yeop Lee),김찬승(Chan Seung Gim),김용재(Yong Jae Kim) 한국전자통신학회 2018 한국전자통신학회 논문지 Vol.13 No.5
직접 접촉 방식의 기계적인 결합을 사용하는 기어는 접촉 마찰로 인한 소음, 진동, 발열 등의 문제가 지속적으로 제기되어왔기 때문에, 비접촉 자기(magnetic)결합을 이용한 마그네틱 기어(magnetic gear)가 제안되었다. 마그네틱 기어에 대한 연구 중 동일한 기어비에서 극수에 따라 손실의 차이가 발생함을 확인하였으며, 철손과 영구자석 와류손이 극수에 따라 일정한 경향성을 보일 것으로 예상되어 연구를 진행하였다. 본 논문에서는 마그네틱 기어의 극수에 따른 경향성을 확인하고 구체화하여 마그네틱 기어의 효율 개선 설계의 기반을 마련하였다. Mechanical gears driven by direct contact have problems including noise, vibration and heat. In order to, solve these problems, magnetic gears having a non-contact magnetic coupling have been proposed. Through various studies on magnetic gears, we found that losses are changed when the number of magnetic poles varies in the same gear ratio. For this reason, research team expect the iron loss of the magnetic gear and the Eddy current loss of the permanent magnet will have a certain tendency depending on the number of poles. This paper identified the magnetic gear’s loss tendency according to the number of poles, and laid the basis for efficiency improvement design.
EPS용 저전압 대전류 유도 전동기의 고효율 간접 벡터제어
고형곤(Hyeonggon Ko),박홍주(Hongjoo Park),박규성(Kyusung Park),이근호(Geunho Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
The studies about an induction motor was not active. However, in recent years, as increasing the price of permanent magnet(Rare earth resources magnet), the studies of the induction motor are becoming more active than before. And advantages of the induction motor are low-priced, easy to make and strong at high speed. But the problems are poor torque response and low efficiency. When the induction motor is driven under light load with rated exciting current, the iron loss is much larger than the copper loss. This study is deal with strategy of high efficiency indirect vector control in EPS. This algorism improves the problems which are torque response and low efficiency.
12-Slot 10-Pole 분수 슬롯을 갖는 영구자석 동기 전동기의 고정자 권선 방법에 따른 철손 특성 해석
김태형(Tae Heoung Kim) 한국자기학회 2018 韓國磁氣學會誌 Vol.28 No.1
A fractional-slot permanent magnet synchronous motor under 180 degree sinusoidal current can be adopted for the electric power steering system of hybrid and electric vehicles. This motor has various stator winding methods such as double-layer and single-layer for its purpose. In this paper, we investigate the iron losses characteristic of the permanent magnet synchronous motor according to the various winding methods. To get the accurate hysteresis and eddy-current losses, we consider the time harmonics of the instantaneous flux density using finite element method. From the analysis results, we know that the most of the iron losses are generated in the stator and the stator teeth shoe part has the highest iron losses density because of its rotating magnetic flux. Under the light and the rated load, the single-layer has less iron losses compared to the double-layer. However, as the load increases, the iron losses in the singlelayer rapidly become larger. This is because the magnetic circuits are saturated.
인휠 외전형 구동 모터의 극 슬롯 조합에 따른 전자기 손실 및 특성 분석
김필중(Peel Joong Kim),박수환(Soo Hwan Park),고욱(Gu Xu),임소연(So Yeon IM),안수민(Soo Min An),임명섭(Myung-Seop Lim) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
In-wheel motors are being studied as a next generation type motor for vehicle applications. And outer rotor permanent magnet synchronous motor(PMSM) is one of the most appropriate motor type for In-wheel motors because of its large torque property. Different from traditional traction motors, outer rotor PMSM directly drives wheels so mechanical loss is much smaller. As a result, electromagnetic loss including iron loss, copper loss and PM eddy current loss are major loss for In-wheel outer rotor PMSM. So to design high efficiency in wheel motor, analysis for electromagnetic loss is essential. So this paper discusses about the electromagnetic loss at main driving point of three outer rotor PMSM models with different pole slot combinations. 32pole 48slot, 40pole 48slot and 44pole 48slot combinations are chosen and additionally torque ripple characteristic that is important for ride quality is also analyzed. In conclusion, major electromagnetic loss and the best pole slot combination is chosen.
영구자석 매입형 동기 릴럭턴스 전동기의 손실 저감을 위한 방향성 강판 적용 설계
위창현(Chang-Hyun Wi),임동국(Dong-Kuk Lim) 한국자기학회 2021 韓國磁氣學會誌 Vol.31 No.6
In this article, the Permanent Magnet-Assisted Synchronous Reluctance Motor (PMa-SynRM) with application of grain-oriented electrical steel (GO) is proposed for electric vehicles (EVs). Because the GO has strong magnetic performance on the rolling direction, the GO is applied partially in the stator of PMa-SynRM. By applying GO, the performance at no-load condition and load condition are increased simultaneously. Especially, the average torque increased 3.24% and the iron loss at no-load condition and load condition decreased by 13.03% and 11.17%, respectively. Finally, by reducing the stack length in proportion to the increased torque, the iron loss at no-load condition decreased by 15.85%.
EPS용 SPMSM의 회전자 형상에 따른 효율 및 열 특성 개선 설계
차창준(Chang-Jun Cha),박진철(Jin-Cheol Park),박민로(Min-Ro Park),박현진(Hyeon-Jin Park),홍정표(Jung-Pyo Hong) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
Electrical Power Steering(EPS) system that assist driver’s vehicle steering is one of the core parts of the vehicle. In addition, the EPS motors require very low vibration and high performance for vehicle stability. In this paper, the electrical parameters of EPS motor is converted into the function of the rotor shape. Using this function, the efficiency and thermal characteristics of the EPS motor are analyzed according to the rotor shape. Then, the design point with high efficiency and improved thermal characteristics is determined as the sizing effect. Then, the improved model is designed. Finally the validity of the improvement model is confirmed by comparing the efficiency and thermal characteristics of the improved model with the existing model.