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Hybrid Excitation Control of SRM Drive for Reduction of Vibration and Acoustic Noise
Lee, Dong-Hee,Lee, Sang-Hun,Ahn, Jin-Woo,Park, Sung-Jun The Korean Institute of Electrical Engineers 2001 KIEE International Transactions on Electrical Mach Vol.11B No.4
The simple motor construction and low cost, fault tolerant power electronic drive has made the switched reluctance drive a strong contender for many applications. But the switched reluctance drive does exhibit higher levels of vibration and acoustic noise than that of most competing drives. The main source of vibration in the switched reluctance drive is generated by rapid change of radial magnetic force when phase current is extinguished during commutation action. In this paper, a hybrid excitation method is proposed to reduce vibration and acoustic noise of the switched reluctance drive. The hybrid excitation has 2-phase excitation by long dwell angle as well as conventional 1-phase excitation. The vibration and acoustic noise are reduced because the scheme reduces abrupt change of excitation level by distributed and balanced excitation.
Research on Tangential Magnetization Parallel Magnetic Path Hybrid Excitation Synchronous Machine
Pang Liang,Zhao ChaoHui,Shen HeBiao 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.5
A hybrid excitation motor with strong magnetizing ability is proposed. To solve the existing hybrid excitation machine problems, such as the diffi culty of total adjustment of air gap magnetic fi eld, many additional magnetic paths, fault tolerance is poor, and Air gap fl ux density harmonic distortion rate is high. According to the structural characteristics and the principle of magnetic regulation of tangential magnetization parallel magnetic path hybrid excitation synchronous machine. The equivalent magnetic path model of the motor was established, and the infl uence of electric excitation magnetic potential on permanent magnetic potential and air gap magnetic fi eld was analyzed. With the ANSYS Maxwell fi nite element simulation software, the variation law of the magnetic fi eld of the motor under diff erent excitation conditions is studied. The infl uence of pole boot length and magnetic pole eccentricity on air gap fl ux density amplitude and harmonic distortion rate is discussed. The results show that due to the characteristics of the parallel magnetic path. The motor has obvious eff ect of adjusting magnetic fi eld and gathering magnetic fi eld, motor fault tolerance is excellent, and less additional magnetic path. In addition, the air gap density can be optimized by using reasonable pole boot length and magnetic pole eccentricity.
Han-Wook Cho,Chang-Hyun Kim,Hyung-Suk Han,Jong-Min Lee 대한전기학회 2012 Journal of Electrical Engineering & Technology Vol.7 No.4
This paper proposes a hybrid-excited linear synchronous motor (LSM) that has potential applications in a magnetically levitated vehicle. The levitation and thrust force characteristics of the LSM are investigated by means of three-dimensional (3-D) numerical electromagnetic FEM calculations and experimental verification. Compared to a conventional LSM with electromagnets, a hybrid-excited LSM can improve levitation force/weight ratios, and reduce the power consumption of the vehicle. Because the two-dimensional (2-D) FE analysis model describes only the center section of the physical device, it cannot express the complex behavior of leakage flux, which this study is able to predicts along with levitation and thrust force characteristics by 3-D FEM calculations. A static force tester for a hybrid-excited LSM has been manufactured and tested in order to verify these predictions. The experimental results confirm the validity of the 3-D FEM calculation scheme for the description of a hybrid-excited LSM.
Characteristic analysis of parallel-rotor hybrid generator based on exciter types
Woo, Hyeon Myeong,Lee, Dong-Hee The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.3
In this paper, a characteristic analysis and a performance comparison of a permanent magnet (PM) exciter and a conventional winding exciter for a parallel-rotor-type hybrid generator is presented. The proposed rotor of the hybrid generator comprises two separate structures, a PM and a field winding. The two rotors are attached in parallel to improve the efficiency and self-starting characteristics. Using this configuration, the PM rotor produces base flux to generate enough no-load voltage and the field winding rotor is used to regulate that output voltage. Because of the PM rotor flux, the automatic voltage regulator can self-start the generator by taking the voltage induced by the PM flux, regardless of the exciter. The self-start capability, dynamic response and efficiency of both exciters are compared and investigated. It can be confirmed through experiments that the PM exciter shows better efficiency and dynamic response with reduced mechanical complexity.
Cho, Han-Wook,Kim, Chang-Hyun,Han, Hyung-Suk,Lee, Jong-Min The Korean Institute of Electrical Engineers 2012 Journal of Electrical Engineering & Technology Vol.7 No.4
This paper proposes a hybrid-excited linear synchronous motor (LSM) that has potential applications in a magnetically levitated vehicle. The levitation and thrust force characteristics of the LSM are investigated by means of three-dimensional (3-D) numerical electromagnetic FEM calculations and experimental verification. Compared to a conventional LSM with electromagnets, a hybrid-excited LSM can improve levitation force/weight ratios, and reduce the power consumption of the vehicle. Because the two-dimensional (2-D) FE analysis model describes only the center section of the physical device, it cannot express the complex behavior of leakage flux, which this study is able to predicts along with levitation and thrust force characteristics by 3-D FEM calculations. A static force tester for a hybrid-excited LSM has been manufactured and tested in order to verify these predictions. The experimental results confirm the validity of the 3-D FEM calculation scheme for the description of a hybrid-excited LSM.
조대원,Ki Dong Song,Seong Kyu Park,Ki Seok Jeon,윤민중 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.4
In order to investigate the excited-state intramolecular proton transfer (ESIPT) process of dihydroxyanthraquinones (DHAQ; 1,5-DHAQ and 1,8-DHAQ) in organic-inorganic hybrid matrices, transparent SiO2, SiO2-Al2O3, and Al2O3 matrices chemically bonded with DHAQ were prepared using a sol-gel technique. The absorption maxima of 1,5- and 1,8-DHAQ in SiO2 matrices are observed at around 420 nm, whereas those of DHAQ in both SiO2-Al2O3 and Al2O3 matrices are markedly shifted to longer wavelength compared with those in SiO2 matrix. This indicates that DAHQ forms a chemical bond with an Al atom of Al2O3. The DHAQ in SiO2 matrix shows a markedly Stokes-shifted emission which is originated from the ESIPT in DHAQ. Based on the emission lifetimes of DHAQ, the ESIPT of DHAQ was found to be strongly affected by the chemical interaction with Al atom in the Al2O3-related matrices.
Cho, Dae-Won,Song, Ki-Dong,Park, Seong-Kyu,Jeon, Ki-Seok,Yoon, Min-Joong Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.4
In order to investigate the excited-state intramolecular proton transfer (ESIPT) process of dihydroxyanthraquinones (DHAQ; 1,5-DHAQ and 1,8-DHAQ) in organic-inorganic hybrid matrices, transparent SiO2, SiO2- Al2O3, and Al2O3 matrices chemically bonded with DHAQ were prepared using a sol-gel technique. The absorption maxima of 1,5- and 1,8-DHAQ in SiO2 matrices are observed at around 420 nm, whereas those of DHAQ in both SiO2-Al2O3 and Al2O3 matrices are markedly shifted to longer wavelength compared with those in SiO2 matrix. This indicates that DAHQ forms a chemical bond with an Al atom of Al2O3. The DHAQ in SiO2 matrix shows a markedly Stokes-shifted emission which is originated from the ESIPT in DHAQ. Based on the emission lifetimes of DHAQ, the ESIPT of DHAQ was found to be strongly affected by the chemical interaction with Al atom in the Al2O3-related matrices.
Ka 대역 통신위성용 다중 빔 배열 급전 반사판 안테나
윤소현(Sohyeun Yun),엄만석(Manseok Uhm),최장섭(Jangsup Choi),염인복(Inbok Yom) 한국전자파학회 2012 한국전자파학회논문지 Vol.23 No.6
본 논문은 한반도 지역에 보편적 위성 통신 서비스를 제공하기 위한 정지궤도 위성의 다중 빔 서비스 커버리지 요구에 따라, 서비스 영역 내의 이득을 높일 수 있는 구현 가능한 안테나 구성 시나리오를 제안하였다. 제안된 시나리오는 위성 탑재가 가능하도록 안테나 및 급전 네트워크 구성을 간소화하고, 제한된 주파수 및 편파자원을 효율적으로 사용하기 위한 급전 네트워크 설계를 포함하고 있다. 또한, 전기적 성능 만족을 위하여 배열소자의 배치 및 여기 계수 최적화가 수행되었다. This paper presents the multibeam service coverage of GEO(Geostationary Orbit) satellite and the practical antenna scheme scenarios to provide the universal communication services on the Korean peninsula. The proposed antenna systems consist of the simplest scheme and feed network so that they can be mounted on satellites. The feed networks are effectively organized according to the frequency and polarization plan. Despite simple structure, all scenarios meet the electrical performance by the optimization of feed allocation and feed excitation.
E. Sulaiman,T. Kosaka,N. Matsui 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Hybrid excitation flux switching synchronous machine (HEFSSM) has several attractive features compared to interior permanent magnet synchronous machines (IPMSM) conventionally employed in hybrid electric vehicles (HEV). Among various types of HEFSSM, the machine with both permanent magnet (PM) and field excitation coil (FEC) on the stator has the advantages of robust rotor structure together with variable flux control capabilities that make this machine becoming more attractive to apply for high-speed motor drive systems. This paper presents an investigation into the design possibility and parameter optimization study of 12Slot-10Pole HEFSSM for traction drives in HEV. The research target is to design a machine with reduced amount of rare-earth magnet, a maximum torque of 210Nm, a maximum power of more than 123㎾, and a maximum power density of more than 3.5㎾/㎏. Extensions in speed and torque ranges are chosen for optimization aims. The deterministic design approach is used to treat ten design parameters in an effort to achieve the target performances. As a result, the designed HEFSSM with 0.4㎏ PM is able to get much higher power density compared to existing IPMSM installed on a commercial SUV-HEV.
E. Hoang,M. Lecrivain,S. Hlioui,M. Gabsi 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
In this paper, the performances of a hybrid excitation flux switching permanent magnets synchronous machine (HEFSSM) that have been optimally designed for a hybrid electric vehicle (HEV) application are shown. The different losses: copper losses and iron losses are computed for the European Normalized Driving Cycle (NEDC) by taking into account all operating points in the torque-speed plan. Finally, the optimization problem of such hybrid excitation machine for a given driving cycle is discussed.