• Title/Summary/Keyword: 직구동 방식의

Search Result 4, Processing Time 0.018 seconds

A Study on the Dynamic Characteristics Improvement of Direct Drive Electro-mechanical Actuation System using Dynamic Force Feedback Control (동적 하중 되먹임 제어를 사용한 직구동 방식 전기기계식 구동장치시스템의 동특성 개선에 관한 연구)

  • Lee, Hee-Joong;Kang, E-Sok;Song, Ohseop
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • v.45 no.4
    • /
    • pp.328-341
    • /
    • 2017
  • In the control actuator system of a launch vehicle based on thrust vectoring, the interaction between electro-mechanical position servo and inertial load are combined with the dynamic characteristics of the flexible vehicle support to generate synthetic resonance. This occurred resonance is fed back to the attitude control system and can influence stability of launch vehicle. In this study, we proposed a simulation model to analyze synthetic resonance of electro-mechanical actuation system for thrust vector control and explained the results of simulation and test using dynamic force feedback control which improves dynamic characteristics of servo actuation system by reducing synthetic resonance.

Development of Direct drive Electro-mechanical Actuation System for Thrust Vector Control of KSLV-II (한국형발사체 추력벡터제어 직구동 방식 전기기계식 구동장치시스템 개발)

  • Lee, Hee-Joong;Kang, E-Sok
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • v.44 no.10
    • /
    • pp.911-920
    • /
    • 2016
  • For the pitch and yaw axis attitude control of launch vehicle, thrust vector control which changes the direction of thrust during the engine combustion is commonly used. Hydraulic actuation system has been used generally as a drive system for the thrust vector control of launch vehicles with the advantage of power-to-weight ratio. Nowadays, due to the developments of highly efficient electric motor and motor control techniques, it has done a lot of research to adopt electro-mechanical actuator for thrust vector control of small-sized launch vehicles. This paper describes system design and test results of the prototype of direct drive electro-mechanical actuation system which is being developed for the thrust vector control of $3^{rd}$ stage engine of KSVL-II.

Analysis Model for Design Based on Stiffness Requirement of Direct Drive Electromechanical Actuator (직구동 전기기계식 구동기의 강성요구규격에 기반한 설계용 해석모델)

  • Oh, Sang Gwan;Lee, Hee Joong;Park, Hyun Jong;Oh, Dongho
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • v.47 no.10
    • /
    • pp.738-746
    • /
    • 2019
  • Instead of hydraulic actuation systems, an electromechanical actuation system is more efficient in terms of weight, cost, and test evaluation in the thrust vector control of the 7-ton gimbal engine used in the Korea Space Launch Vehicle-II(KSLV-II) $3^{rd}$ stage. The electromechanical actuator is a kind of servo actuator with position feedback and uses a BLDC motor that can operate at high vacuum. In the case of the gimballed rocket engine, a synthetic resonance phenomenon may occur due to a combination of a vibration mode of the actuator itself, a bending mode of the launcher structure, and an inertial load of the gimbals engine. When the synthetic resonance occurs, the control of the rocket attitude becomes unstable. Therefore, the requirements for the stiffness have been applied in consideration of the gimbal engine characteristics, the support structure, and the actuating system. For the 7-ton gimbal engine of the KSLV-II $3^{rd}$ stage, the stiffness requirement of the actuation system is $3.94{\times}10^7N/m$, and the direct drive type electromechanical actuator is designed to satisfy this requirement. In this paper, an equivalent stiffness analysis model of a direct drive electromechanical actuator designed based on the stiffness requirements is proposed and verified by experimental results.

Design of Magnetic Slot Wedge Shape for Reducing Cogging Torque in Permanent Magnet Synchronous Generator of Direct Drive Type (직구동 방식 영구자석 동기 발전기의 코깅 토크 저감을 위한 자성체 슬롯 ��지 형상 설계)

  • Moon, Jae-Won;Kim, Seung-Joo;Choi, Han-Suk;Park, Su-Kang;Kim, Bong-Ju;Kwon, Byung-Il
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.26 no.3
    • /
    • pp.80-87
    • /
    • 2012
  • This paper suggests the slot wedge shape for reducing the cogging torque of a direct-drive permanent magnet synchronous generator for a bike. To consider easy coil winding, we applied a structure of open slot for the permanent magnet synchronous generator (PMSG). Because the cogging torque of PWSG with the open slot is very large, we are designed the appropriate specifications of the PMSG by selected the appropriate material of slot wedge and various slot wedge shapes. The prototype model is selected by design theory for reducing cogging torque and maximizing efficiency of PMSG. And the detailed structure design of the model was designed by the loading distribution method. The PMSG models were analyzed by finite element method. Finally, we have suggested appropriate material of slot wedges and its shape which has benefit to further reducing cogging torque and preventing decreasing of the generating power.