• Title/Summary/Keyword: Torque limit

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Dynamic Analysis of Finger Joint Torque for Tip Pinch Task (두 점 집기 작업 시 손가락 관절토크의 역학적 해석)

  • Kim, Yoon-Jeong;Jeong, Gwang-Hun;Rhee, Kye-Han;Lee, Soo-Jin
    • Journal of the Korean Society for Precision Engineering
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    • v.28 no.6
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    • pp.657-682
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    • 2011
  • This paper presents the dynamic analysis on the joint torque of a finger for the tip pinch task. The dynamic model on finger movement was developed in order to predict the joint torques of an index finger, and the finger was assumed as a three-link planar manipulator. Analysis of the model revealed that the joint stiffness was one of the most important parameters affecting the joint torque. The stiffness of the finger joint was experimentally measured, and it was used in analyzing the finger joint torque required for performing the tip pinch task. The obtained joint torque for the tip pinch task will be used as the design requirements of the finger exoskeletal orthosis actuated by the polymer actuator whose allowable torque limit is relatively low compared to that of a mechanical actuator.

PROBLEMS OF A SPEED_CONTROLLED DRIVE SYSTEM WITH BACKLASH (백라쉬를 갖는 속도제어구동 시스템의 문제점)

  • Lee, K.
    • Proceedings of the KIEE Conference
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    • 1989.11a
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    • pp.351-354
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    • 1989
  • In a speed_controlled system with cascade control which shows an optimal performance in the linear case, limit cycles can occur due to backlash. The various effects observed can be explained with the aid of the describing function. With a first-order load torque observer these limit cycles can be avoided. Moreover the dynamic performance improves considerably and the range of application of cascade control is extended.

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Development of Artificial Intelligent PI controller for Maximum Torque Control of Induction Motor (유도전동기의 최대토크 제어를 위한 인공지능 PI 제어기 개발)

  • Kang, Sung-Jun;Ko, Jae-Sub;Choi, Jung-Sik;Baek, Jung-Woo;Jang, Mi-Geum;Moon, Ju-Hui;Chung, Dong-Hwa
    • Proceedings of the KIPE Conference
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    • 2010.07a
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    • pp.587-588
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    • 2010
  • The maximum output torque developed by the machine is dependent on the allowable current rating and maximum voltage that the inverter can supply to the machine. Therefore, to use the inverter capacity fully, it is desirable to use the control scheme considering the voltage and current limit condition, which can yield the maximum torque per ampere over the entire speed range. This controller is controlled speed using artificial intelligent PI(AIPI) controller. Also, this paper is proposed control of maximum torque per ampere(MTPA) of induction motor. The performance of the proposed induction motor drive with maximum torque control using AIPI controller is verified by analysis results at dynamic operation conditions.

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A Control Algorithm for Highly Efficient Operation of Auxiliary Power Unit in a Series Hybrid Electric Bus (직렬형 하이브리드 버스에서 보조동력장치의 고효율 작동을 위한 제어 알고리즘)

  • 함윤영;송승호;민병문;노태수;이재왕;이현동;김철수
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.5
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    • pp.170-175
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    • 2003
  • A control algorithm is developed for highly efficient operation of auxiliary power unit (APU) that consists of a diesel engine and a directly coupled induction generator in series hybrid electric Bus (SHEB). In a series hybrid configuration the APU supplies the electric power needed for maintaining the state of charge (SOC) of the battery unit in various conditions of vehicle operation. As the rotational speed of generator does not depend on the vehicle speed, an optimized operation of engine-generator unit based on the efficiency map of each component can be achieved. The output torque of diesel engine can be controlled by the amount of fuel injection, and the power converted from mechanical to electrical energy can be adjusted by generate control unit (GCU) using the decoupling vector control of torque and flux. As for the given reference of the generating power, the multiply of speed and torque, many combinations of operating speed and torque are possible. The algorithm decides the new operating point based on the engine efficiency map and generator characteristic curve. During the transition of operating points, the speed controller saturation is avoided using variable limit and filtering of generator torque reference. A test rig and SHEB consist of a 1.5L diesel engine and a 30kw induction generator are constructed by Hyundai Motor Company.

Sensorless Vector Control for Maximum Torque of SynRM in the Field Weakening Region (약계자 영역에서 SynRM의 최대 토크제어를 위한 센서리스 벡터제어)

  • Lee, Jung-Chul;Chung, Dong-Hwa
    • Journal of the Korean Society of Safety
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    • v.17 no.2
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    • pp.32-38
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    • 2002
  • In this paper, a new approach for the SynRM(Synchronous Reluctance Motor) control which ensures producing MTPA(Maximum Torque per Ampere) over the entire field weakening region is presented. In addition, this paper presents a speed sensorless control scheme of SynRM using flux observer. Also, by adjusting the base speed for the field weakening operation according to the flux level, the current and voltage limit, the smooth and precise transition into the field weakening operation can be achieved. The validity of the proposed scheme is verified through simulation.

Technique to Solve Problems Due to Load Increment in Maximum Efficiency Control of Stator Flux-Oriented Induction Motor Drive (유도전동기 고정자자속 기준제어의 최대효율제어에서 부하증가로 인한 문제 해결방법)

  • Shin, Myoung-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.21 no.3
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    • pp.69-74
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    • 2007
  • Flux level is low in the maximum efficiency control of a stator flux-oriented control of induction motor under the light load. In this cast if the loaf torque is suddenly increased, torque component current is limited to the low level by torque-limit condition because of the low flux level. In this paper, a technique to solve the problem is proposed.

Maximum Torque Control of SynRM Drive with Artificial Neural Network (인공 신경회로망에 의한 SynRM 드라이브의 최대토크 제어)

  • Ko, Jae-Sub;Nam, Su-Myeong;Chung, Dong-Hwa
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.54 no.4
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    • pp.185-191
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    • 2005
  • In this paper, a new approach for the Synchronous Reluctance Motor control which ensures producing Maximum Torque per Ampere(MTPA) over the entire field weakening region is presented. In addition, This paper presents a speed sensorless control scheme of SynRM using artificial neural network. Also, by adjusting the base speed for the field weakening operation according to the flux level, the current and voltage limit, the smooth and precise transition into the field weakening operation can be achieved. The proposed scheme is verified validity through simulation.

Operation of Brushless DC Motor with Maximun Torque (브러시레스 DC모터의 최대 토오크 운전에 관한 연구)

  • Hyun, D.S.;Shim, J.S.;Hwang, K.O.;Lee, C.S.
    • Proceedings of the KIEE Conference
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    • 1988.07a
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    • pp.133-136
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    • 1988
  • In this paper, the characteristics of brushless DC Motor using voltage source inverter are analysized. The optimal commutation angle for Maximum Torque, the pulse width of supply voltage for available torque and the advanced commutation according to motor speed and electrical time constant effect power factor, efficiency, and no load speed limit.

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A Study on the Torsional Vibration of propulsion Shafting System with Controllable Pitch Propeller (가변익 프로펠러를 갖는 추진축계의 비틀림진동에 관한 연구)

  • 이돈출
    • Journal of Advanced Marine Engineering and Technology
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    • v.22 no.5
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    • pp.626-634
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    • 1998
  • Controllable pitch propeller(CPP) is usually adopted for easy and effective engine controls of a ship in a port. Unfortunately the torsional vibration may occur by a certain variation of engine torque and the major resonance peak may exist within the maximum continuous rating(MCR) In these cases an additional stress concentration on the oil passages such as longitudinal slots notches and circular holes of an oil distributor shaft(ODS) occurs by the torsional vibration of the CPP shaft. In this paper an analysis for the fatigue limit of an ODS system of the 5S70MC engine in a crude oil carrier is done by applying FEM and empirical formulas. Furthermore the additional stress on the ODS is investigated by analyzing the torsional vibration of the shaft system and a control method in which a tuning damper is adopted is introduced in the case of the additional stress exceeds the fatigue limit. The validity of analysis method is verified by comparing the results acquired by an actual measurement of the vibratory torque for the above ODS

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A Variable Speed Control Scheme of a BLDC Motor for the High-Speed Blender Machine (고속 블렌더 머신용 BLDC 모터의 가변속 제어 방법)

  • Bae, Jongnam;Ahn, Jin-Woo;Lee, Dong-Hee
    • Proceedings of the KIPE Conference
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    • 2018.07a
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    • pp.57-59
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    • 2018
  • This paper presents a novel reference variable speed control scheme of a BLDC motor for the high-speed blender machine according to the current limit. Because of a pulsating load variation of a high-speed blender machine, the actual speed is pulsated by the current limit in the high-speed region. The proposed control scheme uses a variable reference speed to reduce the speed variation from the current limit in the constant power region. The pulsated load is occurred at the material crushing, then the pulsated load is reduced after grinding. The reference speed is smoothly reduced at the pulsated load variation, then the enough torque can make a constant speed during crushing. When the pulsating load is reduced, the reference speed is automatically increased to the original speed value. The proposed control scheme is verified by experimental result by practical blender machine.

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