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2중 인버터 시스템을 갖는 해상용 풍력발전기의 3상 평형성에 관한 연구
서장호(Jangho Seo) 한국조명·전기설비학회 2013 조명·전기설비학회논문지 Vol.27 No.6
This paper shows the method of winding connection and the balance of three phase of dual inverter systems used for offshore wind power generator. In order to satisfy low cost manufacturing of large scaled wind generator, the number of slot per pole per phase should be reduced. For this reason, in this research, the number is selected as ‘1’ which is the minimum number that stator can have. Based on the prototype machine, three types of machine for the analysis are selected, and various performances especially in terms of electrically balanced condition are also investigated. Moreover, in this paper, new inductance modeling of dual 3-phase considering cross-coupling between two inverter systems is proposed. The several inductances such as mutual-, synchronous inductances are studied. By using FEA, based on calculated the flux linkage of d and q- axis, the validity of the proposed inductance modeling is confirmed.
매극 매상 슬롯 수에 따른 이중 인버터를 갖는 영구자석형 해상 풍력발전기의 특성 해석
서장호(Jangho Seo) 한국조명·전기설비학회 2016 조명·전기설비학회논문지 Vol.30 No.8
This paper presents several characteristics of performance in dual 3-phase machine for offshore wind power generator according to number of per pole per phase, ‘q’. With the same rotor structure, the number of turn per coil is adjusted to the aim of same electrical loading. By using FEA, self-, mutual- and synchronous inductance are calculated. In addition, magnetic flux density, flux linkage, torque ripple, cogging torque, and demagnetization withstand are investigated. In case of q=1, the model can have large inductance, low mutual coupling between two phase coils, and good demagnetization withstand but it has large torque ripple and cogging. On the contrary, the generator with q=2 can have low torque ripple, cogging and relatively high average torque because of low MMF harmonics but it has high mutual coupling due to low inductance and bad demagnetization withstand.
권선결선 방식에 따른 이중 3상 8극 48슬롯 IPM 전동기 특성 비교 연구
서장호(Jangho Seo) 한국조명·전기설비학회 2021 조명·전기설비학회논문지 Vol.35 No.9
In this paper, characteristic analysis was performed according to the winding connection method of an 8-pole 48-slot IPM motor with a dual inverter system. One 3-phase winding set is connected to a inverter and the other 3-phase winding set is connected to another. With the same rotor structure and same stator, three different types of winding connections for dual 3-phase are proposed. In a winding of type 1 (‘T-1’), the phase coils were placed alternately. In the second type (‘T-2’), the coils of each phase were arranged in half around the circumference. In the the last type (‘T-3’) having 6-phase, phase coils connected to other inverters are placed next to each other so that current angle between two-inverters become 30 degree. For understanding characteristics of IPM with dual 3-phase, the individual torque components are newly presented as equations using the relational expression between flux linkage and torque. By using finite element analysis (FEA), back-elctromotiveforce (EMF), syncrhonous inductance, torque and iron loss were calculated and compared.
PSO를 이용한 3kW급 ISG용 매입형 영구자석 동기 전동기의 설계에 관한 연구
서장호(Jangho Seo) 한국자동차공학회 2012 한국자동차공학회 지부 학술대회 논문집 Vol.2012 No.10
A new design process of IPMSM for ISG requiring high generating power and starting torque is introduced in this research. Because of its high speed operation and extremely hot room temperature of vehicle, the machine can be demagnetized by heating and the rotor structure can be destroyed by centrifugal force. However, because existing design process needs much calculating time to check many constraints, an optimization algorithm based on PSO was adopted. In addition, in order to deal with mechanical stress in the rotor by centrifugal force at maximum speed we combined mechanical stress analysis with the optimal design process. After optimization, characteristic analysis requiring much time such as iron loss, EMF waveform, and torque-ripple was checked. The validity of our proposed methods was verified by comparing simulation results with experimental data.
상그룹 집중권선을 이용한 모듈형 영구자석 전동기에 관한 연구
서장호(Jangho Seo) 한국조명·전기설비학회 2021 조명·전기설비학회논문지 Vol.35 No.10
Large scaled machine such as wind-power generators high reliability and fault-tolerant is becoming much important ever. In order to achieve the reliability and fault-tolerant, using 36-slot/ 34-pole, a novel modular dual 3-phase permanent magnet machine with a phase-group coil is proposed to reduce magnetic mutual interference between phases. Two modular dual 3-phase machines having a fractional slot concentrated winding (FSCW) are selected to show the comparison results such as torque, back-electromotvie force (EMF), mutual inductance permanent magnet (PM) joule loss, and iron loss. One is a conventional FSCW machine and the other is the proposed FSCW machine. Based on coil magneto-motive force vectors deleting two coils in the same a phase-group the magnetic mutual coupling effect is disappeared. From the several simulation results with the help of finite element analysis (FEA), the validity of the proposed concept is confirmed.