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운전 특성을 고려한 고속 전철용 영구자석 동기전동기의 철손 해석
서장호(Seo Jang-Ho),임재원(Lim Jaewon),이상엽(Lee Sang-Yub),정현교(Jung Hyun-Kyo) 한국철도학회 2009 한국철도학회 세미나자료 Vol.2009 No.5
To predict efficiency of Interior Permanent Magnet Synchronous Motors(IPMSM) and to cope with the demagnetization risk of permanent magnets used in the IPMSM, accurate iron analysis of the IPMSM is very important at the motor design stage. In the analysis, we calculate the operation condition such as rotor speed and current angle. and then, we analyzed the iron loss of the machine for electric vehicle according to its driving condition. From the analysis results, it was shown that the harmonic iron losses of stator are larger than before at field-weakening region. In addition, it was revealed that rotor iron loss mainly induced by stator slot-ripples is independent of current angle and only varied according to the speed.
극 수 슬롯 조합과 운전 특성을 고려한 전기자동차용 IPM의 성능 특성에 관한 연구
서장호(Jang Ho Seo) 한국자동차공학회 2013 한국자동차공학회 지부 학술대회 논문집 Vol.2013 No.11
This paper shows the characteristics of performance for interior permanent magnet machine (IPM) considering driving conditions such as maximum torque per ampere (MTPA) and flux-weakening control especially in terms of harmonic loss. In particular, based on finite element analysis (FEA), permanent magnet (PM) eddy-current loss and the harmonic iron loss have been computed where the models have been intentionally designed to identify effects of pole-slot combinations on the loss while maintaining the required power for electric vehicle. From the analysis results, it was shown that the rotor iron loss and PM eddy-current loss of machine employing fractional slot winding has extremely large at load condition. Furthermore, it was reveal that the harmonic iron loss at high-speed operation is mainly distributed stator teeth and rotor surface, which may aggravate cooling system of the rotor structure in the vehicle.
이중 3상 시스템과 모듈러를 갖는 MW급 해상용 풍력발전기의 무정지 기능을 위한 권선 체결방식에 관한 연구
서장호(Jang Ho Seo) 대한전기학회 2013 전기학회논문지 Vol.62 No.8
This paper presents a new winding topology for MW class offshore wind generator having modular and dual 3-phase. Based on proposed simplified relationship between magnetic flux and phase current in the air gap, several new windings for modular and dual 3-phase are made. In case of one inverter operation or faulty operation, the proposed model can have balanced 3-phase induced voltage whereas the conventional generator with modular winding has unbalanced induced voltage, which can be important issue in offshore generator. The model was applied into 6MW prototype machine with dual 3-phase. Using finite element analysis, induced voltage, inductance were investigated. The results show that the proposed modular winding can be applicable to dual inverter system with electrically balanced voltage.
분수슬롯 권선 타입의 매입형 영구자석 동기 전동기의 철손 분석
서장호(Jang-Ho Seo),이경표(Kyung-Pyo Yi),정현교(Hyun-Kyo Jung) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.4
In this paper, we investigated the iron losses in the rotor core of interior permanent magnet synchronous machine (IPMSM), which have distributed armature windings. From the analysis results, we can conclude that iron losses of rotor are definitely large at load condition if the number of slots per pole is fractional. Since the slot-pole combination may induce excessive heating, particular care should be necessary in design of PMSM for a high power rating application such as electric vehicles.
서장호(Seo Jang-Ho),이상엽(Lee Sang Yub),정현교(Jung Hyun-Kyo) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
To predict efficiency of Interior Permanent Magnet Synchronous Motors(IPMSM) and to cope with the demagnetization risk of permanent magnets used in the IPMSM, accurate iron analysis of the IPMSM is very important at the motor design stage. In this paper, we present the method to estimate the iron loss for the IPMSM considering the condition of field weakening control and harmonics of flux density waveform.