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EV용 CFSM의 극 수, 회전자 형상에 따른 특성 분석 및 토크 밀도 향상 설계
박진철(Jin-Cheol Park),박민로(Min-Ro Park),박현진(Hyeon-Jin Park),홍정표(Jung-Pyo Hong),박수환(Soo-Hwan Park),이의천(Eui-Chun Lee) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
In this paper, the advantages of the CFSM (Concentrated flux synchronous motor) using ferrite permanent magnet are introduced. Also, the direction of rotor design for improving torque density is presented. In addition, the CFSM using ferrite permanent magnet was designed and compared with the IPMSM (Interior permanent magnet synchronous motor) using Nd permanent magnet considering the same design specifications. First, the advantages of the CFSM are described by comparing the rotor shape of IPM and the rotor shape of CFSM. And then, the air gap flux density of CFSM was converted to mathematical modeling. The design prameters for improving the torque density are also summarized. Secondly, the tendency of air gap flux density according to pole number and rotor shape was confirmed. The design direction for increasing the torque density is presented and the design of the CFSM is carried out based on the design specifications. Finally, CFSM and IPMSM were compared by volume, weight and torque density.
조립 후 착자 공정을 고려한 컴프레서용 자속집중형 모터 특성 비교
박민로(Min-Ro Park),김규섭(Kyu-Seob Kim) 한국자기학회 2022 韓國磁氣學會誌 Vol.32 No.5
The number of devices using motors is increasing worldwide, and interest in permanent magnets, which are essential components of permanent magnet type synchronous motors with advantages of wide operating range and high power density, is increasing. In particular, rare-earth permanent magnets with high residual induction are used in various fields such as automobile driving motors , for example, EPS motors. However, due to the limited area in which rare earth elements exist, various problems such as supply-demand imbalance and price surges may occur. In response to this, various types of motors that do not use rare earth elements have been developed. In this paper, the characteristics of various types considering the magnetization process after assembly of the concentrated flux synchronous motor are reviewed, and through this, the design direction of the motor is suggested.
영구자석 비선형 자기특성을 고려한 회전자 타입에 따른 모터 특성 분석
박민로(Min-Ro Park),서갑호(Kap-Ho Seo),황성우(Sung-Woo Hwang),임명섭(Myung-Seop Lim) 한국자기학회 2021 韓國磁氣學會誌 Vol.31 No.3
The permanent magnet is an important component that determines the performance and cost of a synchronous motor. Also, the characteristic of the permanent magnet is a major factor in determining the performance of the electric motor. Therefore, to improve the performance of the permanent magnet synchronous motor and reduce the material cost, the permanent magnets having various characteristics are being developed. However, the magnetic properties of permanent magnets have nonlinearity. Therefore, this paper proposes a method to calculate the operating point of a permanent magnet by considering not only the nonlinear magnetic properties of the electrical steel sheet but also the nonlinear properties of the permanent magnet and analyze the characteristics of the electric motor based on this proposed method. Through this, the characteristics of the permanent magnet synchronous motor are analyzed according to the rotor type and the design direction for each type is suggested.
비희토류 매입형 영구자석 동기 모터의 다층 회전자 설계 기술
박민로(Park, Min-Ro),정영훈(Jung, Young-Hoon),임명섭(Lim, Myung-Seop) 대한전기학회 2023 전기의 세계 Vol.72 No.4
본 원고는 비희토류 원소인 Ferrite 영구자석을 이용한 다층 IPMSM의 회전자를 설계하는 방법을 제시한다. Ferrite 영구자석의 잔류자속밀도와 보자력을 보완하기 위해 다층의 영구자석 배치와 고정자 코일의 권선 수를 증가시키지만, 이는 회전자의 기계적 안정성 저하, 전압 초과, 영구자석 불가역 감자를 야기하게 된다. 따라서 본 원고에서는 이러한 특성들을 고려하는 설계 방법을 소개하고 검증한다. This paper presents a method for designing a multi-layer rotor of a IPMSM using ferrite permanent magnets, a non-rare earth element. To compensate for the low remanence and coercive force of ferrite permanent magnets, the multi-layer arrangement of the permanent magnets and the winding number of stator coils are increased, but this causes a decrease in mechanical stability of the rotor, overvoltage, and permanent magnet irreversible demagnetization. Therefore, in this paper, a design method considering these characteristics is introduced and verified.
박호용(Ho-Yong Park),박민로(Min-Ro Park),윤명환(Myung-Hwan Yoon),임명섭(Myung-Seop Lim),홍정표(Jung-Pyo Hong) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
Multi-layer magnet IPMSM is often used for high-power motor due to the benefit to increase reluctance torque under the same current condition. But when it is designed for high-speed motor, mechanical condition should be considered. That is because the centrifugal force applied to a rotor increases the mechanical stress as the speed is higher. If maximum mechanical stress of the designed model is over the required specification, it cannot be used as high-speed motor. In this paper, the method for relieving stress concentration is suggested using two-layer magnet IPMSM model. The mechanical stress is analyzed by adjusting various design factors of the rotor such as thickness of Permanent Magnet (PM), position of PM, thickness of bridge. At this time, the shape of stator is not changed. Also, the way to distribute mechanical stress concentration and the analysis condition are suggested. Using this method, the maximum mechanical stress is decreased under the required condition, keeping the target torque. Both electrical characteristics and distribution of mechanical stress are analyzed using 2-D Finite Element Analysis (FEA), and this will be helpful to design the high speed motor.
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.