• Title/Summary/Keyword: torque characteristics

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Characteristics Analysis of the Hydraulic Motor Design Variables (유압모터의 설계변수에 대한 특성 검토)

  • Liu, Liang-Liang;Jang, Joosup
    • Transactions of the Korean Society of Automotive Engineers
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    • v.21 no.4
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    • pp.188-194
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    • 2013
  • Hydrostatic pumps and motors occupy an important position in hydraulic system. There are a lot of researches on characteristics of hydraulic pumps, but not hydraulic motors. So in order to know the characteristics of hydraulic motors we had this research. The purpose of this study is to derive and analyze the theoretical calculation of hydraulic axial piston motor torque and torque ripples. Then, analyzed the differences between torque ripples with dead place and without dead place on the valve plate, and modeling a hydraulic motor with AMESim software. Finally, theoretical calculation of hydraulic motor torque ripples was verified from the viewpoint of simulation.

Study on the characteristics of IPMSM according to the ratio of magnetic and reluctance torque (마그네틱 토크와 릴럭턴스 토크 비율에 따른 IPMSM의 출력 특성에 관한 연구)

  • Kwon, Soon-O;Lee, Ji-Young;Fang, Liang;Zhang, Peng;Hong, Jung-Pyo
    • Proceedings of the KIEE Conference
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    • 2006.07b
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    • pp.853-854
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    • 2006
  • Interior permanent magnet synchronous motor(IPMSM) has higher power density than other PM(permanent Magnet) machines due to reluctance torque in addition to magnetic torque, and the ratio of magnetic and reluctance torque has influences on motor characteristics such as input current, efficiency, power factor, etc. Therefore, this paper presents the output characteristics of IPMSM according to the ratio magnetic and reluctance torque of IPMSM and discuss the design strategy of IPMSM.

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Design of Cogging Torque and Torque Ripples Reduction for High Precision Controlled SPMSM (정밀제어용 표면부착형 영구자석 동기전동기의 코깅토크 및 토크리플 저감 설계)

  • Kim, Chang-Ki;Lee, Sang-Gon;Jung, Sang-Yong
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.10
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    • pp.1923-1929
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    • 2009
  • The design of SPMSM(surface mounted permanent magnet synchronous motor) has been performed to reduce cogging torque and torque ripples. In general, cogging torque and torque ripples are affected by the shapes of teeth width, yoke depth, magnet pole arc, etc. Particularly, the minimum design point of cogging torque and torque ripples are different so that the design of SPMSM should be done to compromise both of them for precision application. In this paper, the design of PMSM for EPS(electric power steering) system is performed to verify the validity, and the design characteristics versus teeth width, yoke depth, and magnet pole arc are investigated in order to find out the minimum point of cogging torque and torque ripples. In addition, skew of PM is applied for cogging torque reduction.

Fault Tolerance Improvement of IPM Type BLDC Motor Considering Winding Configuration under a Stator Inter-Turn Fault Condition (Stator inter-turn fault 발생 시 권선 방식에 따른 IPM Type BLDC Motor의 Fault Tolerance 향상)

  • Kim, Hee-Woon;Yoon, Jin-Gyu;Hur, Jin
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.3
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    • pp.524-530
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    • 2011
  • This paper analyzes fault tolerance under a stator turn fault, according to the winding configuration. Improvement of torque characteristics and fault tolerance can be achieved by winding configuration without additional methods. And, torque characteristics and fault tolerance according to the winding configuration can be usually analyzed by analytical method. But, when the stator turn fault generates, compare to the steady-state, analysis of torque characteristics and fault tolerance using the analytical method is not accurate because it does not reflect influence in mutual inductance and magnetic non-linearity. Therefore, analysis of torque characteristics and fault tolerance has to be performed by using the numerical method under fault condition. This paper develops fault characteristics according to the winding configuration using the FEM-base model considered magnetic non-linearity. And, this paper suggests fault tolerance improvement according to the winding configuration, by the comparison of 8/12 and 10/12 models, under fault condition.

Finite Element Analysis of Torque Characteristics of Harmonic Side Drive Motor (유한 요소법을 이용한 하모닉 모터(Harmonic side drive motor)의 토오크 특성 해석)

  • Yun, Seo-Jin;Lee, Eun-Woong;Lee, Dong-Ju
    • Proceedings of the KIEE Conference
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    • 1998.11a
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    • pp.58-60
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    • 1998
  • This paper analyzes the torque characteristics with the structure of harmonic side drive motor using by F.E.M and conformal mapping method. F.E.M and conformal analysis result are almost same. Through the results, we investigate how do design parameters variation affect torque characteristics.

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An Experimental Study on Torque Characteristics and Efficiency of Hydraulic Couplings (유체커플링의 토오크 특성과 효율에 관한 실험적 연구)

  • 박용호;염만오
    • Journal of Advanced Marine Engineering and Technology
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    • v.18 no.5
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    • pp.46-55
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    • 1994
  • The purpose of this research is to construct experimental test set-up and to establish a series of performance test program for the domestically developed hydraulic couplings, and to provide a software to store and utilize these experimental data which can be used to improve the performance of the hydraulic coupling and solve the job problems confronted during operation. The performance test consists of measurement of torque, rpm and efficiency of the hydraulic coupling for three different amounts of working fluid with various loads to the output shaft, and investigating the torque, rpm and efficiency characteristics with respect to these parameters. The results of this study can contribute to the development of variable speed hydraulic coupling and torque converter pursued by the domestic industry.

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Analysis of Dynamics Characteristics for Friction Elements in Automatic Transmission (자동변속기 마찰요소의 동특성 해석)

  • 최영종;정우진;김성원
    • Transactions of the Korean Society of Automotive Engineers
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    • v.5 no.5
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    • pp.9-19
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    • 1997
  • In this paper, the modeling and analysis of dynamic characteristics has been carried out for friction clutches and brakes in an automatic transmission. From the operating oil pressure generated by the valve-body, time delay by check valve and the movement of piston has been examined. Also torque capacity and torque transferred at the clutch is studied. Heat capacity and temperature distribution at the reaction plate of clutch are codeled by time-dependent, nonhomogeneous partial differential equation, and brake torque, brake time, and the amount of heat generated are investigated. It is found that the time delay at the check valve is very short but dominant at the spool.

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The Effects of High Torque Starters on the Starting Characteristics of a Micro-hybrid Engine (고토크 스타터에 의한 마이크로 하이브리드 엔진의 시동특성 개선 효과)

  • Kim, S.S.
    • Journal of Power System Engineering
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    • v.14 no.2
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    • pp.12-15
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    • 2010
  • It is requested to shorten the starting duration for idle stop function equipped cars without harmful effects on the environment. Higher cranking speeds can be achieved with high torque starter. The object of this study is to develope the high torque starter and evaluate its effect on the exhaust emissions. The test was conducted on a 1.5 L, 4-cylinder, 16 valve, multipoint-port-fuel-injection gasoline engine. Engine out emissions such as HC, CO, $CO_2$, and the excess air ratios, lambda were measured using MEXA-554JK. The result showed that a high torque starter, HTS-II shortened the starting duration and reduced engine out emissions of HC, CO and improved starting performance with larger excess air ratio than that of the original starter, Org. S and a high torque starter, HTS-I.

NUMERICAL ANALYSIS OF INTERNAL CHARACTERISTICS ON DENTAL HIGH-SPEED AIR TURBINE HANDPIECE (의료용 고속 에어터빈 핸드피스의 내부 유동특성에 대한 수치해석)

  • Ryu, K.J.;Youn, D.H.;Baek, J.H.;Lee, D.W.;Kim, D.Y.;Kim, D.Y.;Song, D.J.
    • 한국전산유체공학회:학술대회논문집
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    • 2011.05a
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    • pp.535-542
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    • 2011
  • To utilizing CFX V12.0.l, internal flow characteristics of denture high-speed air turbine hand-piece unit was identified, in order to analyze the performance of the torque values were compared. In order to find out the difference of torque by mash values, under steady condition, performed grid convergence test. It compared theoretical torque with torque through flow analysis. To describe the motion of turbine blade was used to immerged solid method. Depending on the location of the turbine blade were calculated from five case. Maximum and minimum values of turbine blades was analyzed. To analyze the performance of the torque values were compared with speed of turbine blade.

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A Study on the Improvement of Torque Characteristics of D.C Brushless Motor by Auxiliary Slot Method (보조 슬롯법에 의한 D.C Brushless Motor의 토오크특성 개선에 관한 연구)

  • Im, Dal-Ho;Kim, Saeng-Su;Son, Yung-Kyu
    • Proceedings of the KIEE Conference
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    • 1988.07a
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    • pp.83-86
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    • 1988
  • In all sorts of primary factor which produce torque ripple of d.c brushless motor cogging torque which is generated from relation between permanent magnet rotor and salient pole cannot controled by external control system. So in this paper cogging torque is analysed by simple method in which slot fuctuion is introduced. And for reducing counterplan of cogging torque d.c brushless motor which plot auxiliary slot by inequality interval is proposed. Thus the quantitative torque characteristics of new motor which designed by this method is analysed by F.E.M and validity of this new design is proved.

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