• Title/Summary/Keyword: Internal Motor

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Lead-Lag Controller Design of Direct Drive Servo Valve Using Complex Method (컴플렉스법에 의한 직접구동형서보밸브의 진상-지상 제어기 설계)

  • Lee, Seong-Rae
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.1590-1595
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    • 2003
  • Direct drive servovalve(DDV) is a kind of one-stage valve since the rotary motion of DC motor is directly transferred to the linear motion of valve spool through the link. Since the structure of DDV is simple, it is less expensive, more reliable and offers reduced internal leakage and reduced sensitivity to fluid contamination. However, the flow force effect on the spool motion is significant such that it induces large steady-state error in a step response. If the proportional control gain is increased to reduce the steady-state error, the system becomes unstable. In order to satisfy the system design requirements, the lead-lag controller is designed using the complex method that is one kind of constrained direct search method.

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Control of a Magnetic Suspension System with Inductive Sensors for a High Vacuum Turbomolecular Pump (Inductive Sensor를 이용한 고진공 분자펌프용 자기부상계의 제어)

  • 노승국;박병철;정민경;노명규;박종권;경진호;구본학
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.361-365
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    • 2002
  • In this paper, a magnetic suspension system with inductive sensors fur a high vacuum turbomolecular pump(TMP) is discussed. The performance of designed inductive position sensor is evaluated by static and dynamic test, and the test results show sensitivity of about 6,000 V/m and dynamic bandwidth of 750 ㎐. The protype of magnetic suspension system is designed and constructed with 5-axis magnetic bearing, inductive sensor and BLDC internal motor. With DSP based digital PID control system, the prototype is examined its high damping ratio and stable operation up to 20,000 rpm of rotation.

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A study on residual stress distribution in surface grinding (평면연삭에서의 잔류응력 분포에 관한 연구)

  • 김경년;정재천;김기선
    • Journal of the korean Society of Automotive Engineers
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    • v.13 no.6
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    • pp.109-118
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    • 1991
  • In this study, it is intended to investigate the effect of the grinding conditions such as table feed, down feed, cross feed of residual stress distribution. And this distribution is investigated upon the grinding direction and the its orthogonal direction at ground layers. The material is used carbon steel (SM20C) which usually used to motor axis. And in order to be considered as Bernoulli-Euler beam, the dimension of the specimen is appropriately designed. According as corroiding the ground surface, the residual stress layers are removed and strain which occured on account of unbalance of internal stress is detected by rosette-gate. Through A/D converter and computer, these values are saved and evaluated residual stress by stress-strain relation formula. Finally, these results are diagrammatized with Auto Cad. The results obtained are as follows. As the depth from the ground surface increases in grinding direction and its orthogonal direction, tensile residual stress exists in the surface, and subsequently it becomes compressive residual stress as it goes downward. As the table feed, the cross feed and the down feed increase, maximum residual stress is transformed form the tensile to the compressive.

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DEVELOPMENT OF INTELLIGENT POWER UNIT FOR HYBRID FOUR-DOOR SEDAN

  • Aitaka, K.;Hosoda, M.;Nomura, T.
    • International Journal of Automotive Technology
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    • v.4 no.2
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    • pp.57-64
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    • 2003
  • The Intelligent Power Unit (IPU) utilized in Honda's Civic Hybrid Integrated Motor Assist (IMA) system was developed with the aim of making every component lighter, more compact and more efficient than those in the former model. To reduce energy loss, inverter efficiency was increased by fine patterning of the Insulated Gate Bipolar Transistor (IGBT) chips, 12V DC-DC converter efficiency was increased by utilizing soft-switching, and the internal resistance of the IMA battery was lowered by modifying the electrodes and the current collecting structure. These improvements reduced the amount of heat generated by the unit components and made it possible to combine the previously separated Power Control Unit (PCU) and battery cooling systems into a single system. Consolidation of these two cooling circuits into one has reduced the volume of the newly developed IPU by 42% compared to the former model.

Analysis of Electro-magnetic Interference Noise for Eco-friendly Vehicle (친환경 자동차의 전자파 방사 노이즈 특성 분석)

  • Kim, Hae-Sung;Yong, Boo-Joong
    • Transactions of the Korean Society of Automotive Engineers
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    • v.19 no.6
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    • pp.76-81
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    • 2011
  • Fossil fuel, the energy source of internal combustion engine automobiles, is limited in resource and has caused environmental issues for decades. Accordingly, automobile manufacturers from many countries around the world are developing or producing eco-friendly vehicles that utilize alternative sources of energy. These vehicles are equipped with many electronic and electrical components which operate on high voltage and/or large current that were not used in conventional combustion engine automobiles. In this paper, in order to analyze the electro-magnetic interference noise, electric vehicles and fuel cell electric vehicles are tested under the guidelines of KMVSS (Korean Motor Vehicle Safety Standards) as well as under test modes that are not stipulated under the guidelines.

Generation of Road Surface Profiles with a Power Spectral Density Function (전력밀도함수를 이용한 노면형상 생성에 관한 연구)

  • 김광석;유완석
    • Transactions of the Korean Society of Automotive Engineers
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    • v.5 no.1
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    • pp.136-145
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    • 1997
  • To analyzed ride quality and to predict durability in vehicle dynamics, it is essential to describe a road surface profile precisely. This paper presents a technique to generate road surface profiles in a spatial domain by using a power spectral density function. A single track power spectral density function is proposed to describe a road surface profile, which is also applicable for multi-track vehicle response analysis, The derived road surfaces are compared to ISO(International Organization for Standardization) standards and classifications, proposed by the MIRA(Motor Industry Research Association). The methodology in this paper is also proposed to generate road roughness description with a limited external data. A small amount of external curve data is combined with an internal PSD function to generate road surface roughness in a spatial domain.

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A Study on the Performance Improvement in the Intake System of a Large-sized Commercial Bus (대형버스 흡기시스템 성능 개선에 관한 연구)

  • Lyu, Myung-Seok
    • Transactions of the Korean Society of Automotive Engineers
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    • v.13 no.2
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    • pp.16-21
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    • 2005
  • The performance of reciprocating internal combustion engine is a strong function of the air intake system configuration. In order to improve engine power, it is essential to optimize the air induction system. In this study, a numerical investigation has been carried out for the three-dimensional flow and pressure characteristics in air intake system of a large-sized commercial bus. CFD simulations using STAR-CD were also perform ed to evaluate effects of intake duct geometry and structure variation inside air cleaner on the negative pressure distribution of overall intake system. Studies for improving the back pressure distribution have been proposed and quantitatively examined based on intensive case studies.

EEV Superheat Control of a Multi-type Heat Pump by Using Dither Signal (멀티형 히트펌프 전자팽창밸브의 디더 신호를 적용한 과열도 제어)

  • 한도영;표수환
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.14 no.11
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    • pp.948-953
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    • 2002
  • The electronic expansion valve (EEV) may be used to control the refrigerant flow rate for the multi-type heat pump. Stepping motor driven EEV may precisely control the refrigerant flow rate to meet each internal load requirement. To control the EEV, PI algorithm may be used. But the hysteresis of EEV deteriorates the performance of superheat control. To reduce the performance degradation, the PI algorithm along with the dither signal may be used. The dither signal, with about 10 times higher frequency than the system crossover frequency and about 10 times larger magnitude than the deadband of hysteresis, was selected for the superheat control of EEV. Experimental results showed the improvement of EEV control by adding the dither signal to the PI algorithm.

A Robust Servo Control System Design Using Least Distribution Control Method (최소분산제어법에 의한 강인한 서보 제어기 설계)

  • Kim, Sang-Bong;Lee, Choong-Hwan;Yoo, Hui-Ryong
    • Proceedings of the KIEE Conference
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    • 1995.07b
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    • pp.726-728
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    • 1995
  • A servo control algorithm robust under disturbance and reference change is developed using the self tuning control method based on the concept of the least distribution control. Also, the design algorithm incorporates the concepts of the well known internal model principle and the annihilator polynomial. In order to evaluate the effectiveness of the method, MAGLEV (Magnetic Levitation) system is used and the position control experiment for reference changes and disturbances of step type is done.

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Lead-Lag Controller Design of Direct Drive Servo Valve Using Complex Method (컴플렉스법에 의한 직접구동형서보밸브의 진상-지상 제어기 설계)

  • Lee, Seong-Rae
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.28 no.11
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    • pp.1719-1726
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    • 2004
  • Direct drive servovalve(DDV) is a kind of one-stage valve because the main spool valve is directly driven by the DC motor. Since the structure of DDV is simple, it is less expensive, more reliable and offers reduced internal leakage and reduced sensitivity to fluid contamination. However, the flow force effect on the spool motion is significant such that it induces large steady-state error in a step response. If the proportional control gain is increased to reduce the steady-state error, the system becomes unstable. In order to satisfy the system design requirements, the lead-lag controller is designed using the complex method that is one kind of constrained direct search method.