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토크-속도 특성곡선을 고려한 70kW급 IPM 견인전동기의 토크리플 최적화
정경태(KyungTae Jung),정재덕(JaeDeok Jung),김용찬(YongChan Kim),여운갑(WoonGap Yeo),송경태(KyungTae Song) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
IPM motors used as traction drive modules tend to have high torque ripple and can cause high levels of NVH. Several studies have been conducted on how to reduce the torque ripple of IPM motors. One approach is to design a specific shape of the rotor or stator to reduce the torque ripple, and another is to modify the control method or structural rigidity. However, as is well known, changing the structural rigidity or control method is a challenging task. The root cause of the vibration is fundamentally related to the electric force. There have been many studies on optimizing the electro-magnetic circuit to reduce torque ripple, but there are limitations to the optimization methods due to computing power and time-consuming. This paper proposes a method to design IPM motors that can be able to minimize the loss of maximum torque while reducing torque ripple at a specific speed.
차선유지 보조 시스템을 위한 표면부착형 영구자석 전동기 특성
정경태(Kyungtae Jung),김유식(Yusik Kim),홍정표(Jungpyo Hong),이근호(Geunho Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
As a development of technology, LKAS which uses an EPS motor came to use in recent. Automotive control systems are complex systems involving given much weight on the system, the complexity of multidisciplinary knowledge. According to the glowing number automotive control system is rapidly increasing. of advanced electrical components like LKAS, the complexity is rapidly increasing. By simulation effect of motor torque assist through electric power steering revealed effective, and motor model are proved reasonable through comparison with real motor experimental datum.
강관수(Jung, Kyung-Tae),소재귀(Sonu, Jung Ho),정경태,선우중호 한국해안해양공학회 1993 한국해안해양공학회 논문집 Vol.5 No.2
본 논문은 유사변환기법을 이용한 새로운 3차원 연직 모우드 전개 모델의 개발에 대하여 기술한다. 기본방정식을 External 모우드와 Internal 모우드로 분리시킨 다음 Internal 모우드식에 Galerkin 방법을 적용하고 구성되는 행열방정식에 유사변환기법을 적용, 기저함수의 계수 값을 구하였다. 최종 얻어지는 기저함수의 계수 값은 마찰장을 제외하고는 비연계되어 시간 간격의 제약을 거의 받지않고 연직 구조를 구할 수 있기 때문에 경제성면에서 탁월하다. 수립된 모델은 어떤 기저함수라도 적용 가능하나 현 단계에서는 Chebyshev 다항식함수가 사용되었으며, 바람응력은 일정한 것으로 가정하였다. 모델 테스트로서 정상상태의 균일한 바람응력이 가해지는 장방형 Basin에 적용하여 모델의 적용 가능성을 검증하였다. This paper presents a new modal solution of linear three-dimensional hydrodynamic equations using similarity transform technique. The governing equations are first separated into external and internal mode equations. The solution of the internal mode equation then proceeds as in previous modal models using the Galerkin method but with expansion of arbitrary basis functions. Application of similarity transform to resulting full matrix equations gives rise to a set of uncoupled partial differential equations of which the unknowns are coefficients of mode vector. Using the transform technique a computationally efficient time integration is possible. In present from the model use Chebyshev polynomials for Galerkin solution of internal mode equations. To examine model performance the model is applied to a homogeneous, rectangular basin of constant depth under steady, uniform wind field.
고조파 전류 주입을 통한 견인전동기의 소음 진동 저감연구
정재덕(Jae-Deok Jung),정경태(KyungTae Jung),송경태(KyungTae Song) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
As the electric vehicle market expands, the developing engineers have been putting lots of efforts into the electromagnetic noise reduction of the traction motors. The fundamental source of electromagnetic noise stems from the torque ripple and electromagnetic radial force reacting between rotor and stator of motors. Many approaches have been introducing a lot of methods to reduce the torque ripple, the research has studied the harmonic current injection method which is reducing torque ripple by adding a specific current value and phase into the input current. It was evaluated that the torque ripple is lowered from 3.43% to 0.68% under base rpm, and from 14.63% to 2.88% at high speed. And the radiated power level was also lowered at 2000 and 10,000 rpm by 2 dB and 1 dB respectively, and the radiated power in watt was reduced by 37% and 21% respectively. However, it is expected that it can be applied limitedly only below a certain speed because precise control is required.
이종석(Jong-Seok Lee),정경태(Kyung-Tae Jung),정재식(Jae-Sik Jung),임명섭(Myung-Seop Lim),홍정표(Jung-Pyo Hong) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
This paper presents a cost advantage of Concentrated Flux Synchronous Motor(CFSM) compared with SPMSM(Surface-mounted Permanent Magnet Synchronous Motor) in electrical brake system. Because of CFSM use non-rare earth magnet, cost is lower than SPM that use rare earth magnet, like NdFeB magnet. And It can concentrate flux, so it may be the same as SPM performance. In this paper, CFSM design to replace SPM, comparing the performance according to series turns per phase and stack length, and analysis trend of cost reduction. It used 2D- finite elements method for analysis.
마그파인 자석의 불가역 감자 특성을 고려한 EV 구동용 전동기 설계
박호용(Ho-Yong Park),이수경(Soo-Gyung Lee),정영훈(Young-Hoon Jung),정경태(Kyung-Tae Jung),홍정표(Jung-Pyo Hong) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
Recently, the high power density and efficiency of interior permanent magnet synchronous motor (IPMSM) for electric vehicle traction has been attracting attention. Particularly in order to overcome the cost issues of rare-earth dependent on China, Magfine magnet, which consists of neodymium without Dysprosium (Dy) and has enhanced coercive force, has been developed. However, Magfine magnet is vulnerable to irreversible demagnetization by external magnetic field. And it is essential to prevent this phenomenon. This paper suggests a design using the magnetic flux barriers in order to decrease the irreversible demagnetization of the permanent magnet (PM). Also, by using the 2-D finite element analysis (2-D FEA), it was confirmed that the permanent magnet irreversible demagnetization characteristic of the proposed model is improved. Thus, when advancing research in consideration of the Magfine fabrication process, it is expected that the commercialization of Magfine magnet can be accelerated with a more accurate performance prediction.