• 제목/요약/키워드: Load torque

검색결과 1,105건 처리시간 0.029초

State Observer Design Considering Modelling Errors and Parameter Variations (모델링 오차와 파라미터변동을 고려한 상태 관측기 설계)

  • Kim, Chan-Ki
    • Proceedings of the KIEE Conference
    • /
    • 대한전기학회 1997년도 하계학술대회 논문집 F
    • /
    • pp.2078-2081
    • /
    • 1997
  • IP speed controller is used as a main controller and it makes the system low overshoot and easy controllability. Load torque is estimated by Kalman filter algorithm and parameter controller is used against a rotor inertia negative variations. Parameter Controller (PC) is equipped with a torque observer implemented by software of a digital signal Processor. PC is a parameter controller which selects a moment of inertia J in responding to a load torque to control the system response.

  • PDF

Robust Speed Control of Induction Motor Using Load Torque Observer (부하변동에 강인한 유도전동기 속도제어)

  • Park, Rae-Kwan;Hyun, Dong-Scok
    • Proceedings of the KIEE Conference
    • /
    • 대한전기학회 1993년도 하계학술대회 논문집 B
    • /
    • pp.686-688
    • /
    • 1993
  • This paper proposes a robust speed control algorithm of Induction Motor. The main idea of this paper is to compensate the torque component of motor current with load torque observer and feedforward control. The speed response of the conventional PI controller is affected by variation of system parameters. However the proposed system has robust characteristics against the variation of system parameters. The simulation results and experiment prove the validity of proposed algorithm.

  • PDF

Precision Speed Control of PMSM for Stimulation of the Vestibular System Using Rotatory Chair (전정기관 자극용 회전자극기를 위한 PMSM의 정밀 속도제어)

  • 이태호
    • Proceedings of the KIPE Conference
    • /
    • 전력전자학회 2000년도 전력전자학술대회 논문집
    • /
    • pp.628-631
    • /
    • 2000
  • A new control method for precision robust speed control of a PMSM(Permanent Magnet Synchronous Motor) using load torque observer is presented. With this system we can obtain more reliable eye moving singal(nystagmus) Until now rotating chair system which is called 2D-optokinetic stimulator is used to make dizzincess. However an inclined rotating chair system witch is 3D-optokinetic stimulator is needed to obtain the precise dizziness data. This 3D-optokinetic sitimulator include unbalanced load aused by unbalanced center of mass. For this case new compensation method is considered to obtain robust speed control using load torque observer. To reduce the effect of this disturbance we can use dead-beat observer which has high gain. The application of the load torque observer is published in [1] for position control. A problem of using speed information such as amplifying effect of noise is reduce by moving average process. The experimental results are depicted in this paper to show the effect of this proposed algorithm.

  • PDF

Characteristics Experiment of Domestic Developed Hydraulic Axial Piston Motor (개발한 국산화 유압 액셜피스톤모터의 특성실험)

  • Yum, Man-Oh;Lee, Sang-Yun
    • Transactions of the Korean Society of Machine Tool Engineers
    • /
    • 제16권5호
    • /
    • pp.70-76
    • /
    • 2007
  • The purpose of this study is to analyze the characteristics of a domestic developed hydraulic axial piston motor. An experimental apparatus was constructed and the output torque, the input oil pressure, the input flow rate, the speed of motor and oil temperature were measured. They were measured under both no load and load conditions. The results are as follows; 1. Motion of motor became steady state conditions after 5 seconds. 2. Output torque of motor was proportional to input oil pressure under both load and unload. 3. Speed of motor decreased with increasing load. 4. Oil temperature was almost constant. The results of this study will offer the basic data in designing and operating hydraulic axial piston motors.

Evaluation of Friction Torque for a Turbopump Ball Bearing (터보펌프 볼 베어링의 마찰 토크 평가)

  • Jeon, Seong-Min;Kwak, Hyun-Duck;Kim, Jin-Han
    • Tribology and Lubricants
    • /
    • 제27권1호
    • /
    • pp.25-33
    • /
    • 2011
  • Rolling contact ball bearings are utilized almost exclusively for liquid propellant rocket engine turbopump. Turbopump ball bearings are required to endure high speed and high load for a poor lubricated condition in cryogenic environment. To evaluate bearing heat generation performance, friction torque is investigated as a function of rotation speed, bearing load and cooling flow rate through an experimental study using water coolants. Radial and axial loads are simultaneously applied to the test bearing by gas pressurized cylinder rod. Endurance performance of bearing has been also verified under the bearing required load for operating condition during total accumulated test time 2,100 sec.

Development of the Measurement System for Evaluating Mechanical Properties of Nano-diamond Coated Film (나노 다이아몬드 코팅박막의 기계적 특성 평가를 위한 계측시스템의 개발)

  • Kweon, Hyun Kyu;Lee, So Jin;Kweon, Yong Min
    • Journal of the Semiconductor & Display Technology
    • /
    • 제18권1호
    • /
    • pp.25-31
    • /
    • 2019
  • In this study, a new adhesion evaluating equipment and data processing methods were developed to overcome some limitations of existing evaluating equipment. Nano-diamond coated tool is a specimen of experiment. When applying frictional force and shear force on the specimen by a rotating polishing pad, delamination occurs at a moment. During each experiment, the vibration, load, and torque is obtained by accelerometer, loadcell and torque s+ kpensor. Frictional force and coefficient of friction are obtained by calculating torque and load. Based on FFT transformation, acceleration is processed and analyzed. As a result, the moment of delamination and the load at that time can be detected by the new developed equipment and measurement system. Finally, we call this load as an Adhesion force.

A Study on the Reliability of an Air Foil Journal Bearing for High Speed Turbomachinery (고속 터보기계용 공기 포일 저널 베어링의 신뢰성에 관한 연구)

  • Lee, Yong-Bok;Kim, Tae-Ho;Kim, Chang-Ho;Lee, Nam-Soo
    • 유체기계공업학회:학술대회논문집
    • /
    • 유체기계공업학회 2002년도 유체기계 연구개발 발표회 논문집
    • /
    • pp.199-206
    • /
    • 2002
  • This paper describes a reliability characteristics of an air foil journal bearing for high speed turbomachinery at room temperature. To verify the reliability of air foil journal bearing, lift-off characteristics, load carrying capacity, and 10,000 cycle start-stop test were performed with motor driven test rig. Lift-off test shows the relationship between the rotating speed of the shaft and the frictional torque with bearing surface. About load carrying capacity, the tested air foil journal bearing produced a load capacity of 500N at an operating speed of 15,000rpm, which is compared with results of numerical analysis and empirical coefficients. Finally, The trends in change of start torque, stop torque, and bearing temperature were shown during 10,000 cycle start-stop test of an air foil journal bearing. from the results of this work, an air foil bearing will be done well, as a supported bearing for high speed turbo-compressor.

  • PDF

A Study on the Reliability of an Air Foil Journal Bearing for High Speed Turbomachinery (고속 터보기계용 공기 포일 저널 베어링의 신뢰성에 관한 연구)

  • Kim, Tae-Ho;Lee, Yong-Bok;Kim, Chang-Ho;Lee, Nam-Soo
    • The KSFM Journal of Fluid Machinery
    • /
    • 제6권2호
    • /
    • pp.7-14
    • /
    • 2003
  • This paper describes reliability characteristics of an air foil journal bearing for high-speed turbomachinery at a room temperature. To verify the reliability of air foil journal bearing, lift-off characteristics, load carrying capacity, and 10,000 cycle start-stop test were performed with a motor-driven test rig. A lift-off test shows the relationship between the rotating speed of the shaft and the frictional torque with bearing surface. About a load-carrying capacity, the tested air foil journal bearing produced a load capacity of 500N at an operating speed of 15,000rpm, which is compared with results of numerical analysis and empirical coefficients. Finally, the trends in change of start torque, stop torque, and bearing temperature were shown during a 10,000-cycle start-stop test of an air foil journal bearing. We found that an air foil bearing performs well, as a supported bearing for the high-speed turbocompressor.