• Title/Summary/Keyword: 회전감속기

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Development and Performance Test of a Spherical Reaction Wheel Actuator with Magnetic Levitation (자기부상을 적용한 구체 반작용휠 구동기 개발 및 성능 시험)

  • Kim, Dae-Kwan;Yoon, Hyung-Joo;Kim, Yong-Bok;Kang, Woo-Yong;Choi, Hong-Taek
    • Journal of Advanced Navigation Technology
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    • v.16 no.5
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    • pp.731-737
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    • 2012
  • In the present study, a feasibility study on an innovative satellite attitude control actuator is performed. The actuator is specially designed to generate the reaction torque in an arbitrary axis, so that a satellite attitude can be controlled by using itself. It consists of a spherical flywheel and electromagnets for levitation and rotation control of the ball. As the earlier study, a rotating performance test on the spherical actuator is conducted in a single rotating axis and vertical levitation condition. From the test results, it can be confirmed that the maximum speed and torque of the innovative device are 7,200rpm and 0.7Nm, respectively. Using a velocity-voltage characteristic curve of the spherical motor, an open-loop control (V/f constant control) is performed, and the test results show excellent control performance in acceleration and deceleration phases.

A Study on the Integration of Motor - Transmission for Commercial Electric Vehicle (상용전기자동차용 모터-변속기 일체화에 관한 연구)

  • Oh, Se-Hoon;Youm, Kwang-Wook
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.6
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    • pp.306-313
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    • 2019
  • Owing to the present problems of air pollution and fossil fuel exhaustion, ongoing research has been actively focused on developing an electric actuator system that can utilize diverse energy sources without producing any exhaust gas. Since the motors of such electric vehicles generally rotate at a high speed, the initial acceleration capability required for an automobile is insufficient. In this study, the motor output was decelerated by the transmission; the initial acceleration of the vehicle was increased, and the motor size and weight were reduced. The driving motor and transmission, which each form isolated structures, were integrated to simplify the connector for input and output. By reducing the cooling system's capacity, a vehicle was designed and manufactured that represents a structural change in effective technology.

A Study on the Improvement of Driving Stability for the Motorized Manual Wheelchair INMEL-VII (전동화 수동 휠체어 INMEL-VII의 주행 안정성 개선에 관한 연구)

  • Jeong, Dong-Myeong;Go, Su-Bok;Kim, Ju-Myeong
    • Journal of Biomedical Engineering Research
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    • v.16 no.4
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    • pp.543-554
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    • 1995
  • This paper describes the improvement of driving stability and the control system for INMEL-VII which is motorized manual wheelchair to satisfy requirements of the disabled The INMEL-VI was based on high maneuverability of the omnidirection drive and safety But the results of field tests about two years showed some problems to the disabled in daily life such as driving stability, Pm switching noise, and rotation of motor without driving command on negative slope. To solve the problems due to an increased DC motor power and applied to direct connection method in INMEL- VII. It improved the driving circuits and set switching frequency to 5KHz to eliminate the switching noise caused by PWM control of DC motor, As compare with the INMEL-VI, INMEL-VII is improved in driving stability by transfer the weight center to forward. The results of field testing proved the improvement of the driving stability and software algorithm It has been estimated to have a hlgh practical use for powered walking aids to the disabled's daily life.

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Design of Indoor Electric Moving and Lifting Wheelchair with Minimum Rotation Radius and Obstacle Overcoming (최소 회전반경 및 장애물 극복형 실내 전동 이·승강 휠체어의 설계)

  • Kim, Young-Pil;Ham, Hun-Ju;Hong, Sung-Hee;Ko, Seok-Cheol
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.10
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    • pp.415-424
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    • 2019
  • In this paper, a minimum rotation radius was designed and fabricated to overcome the threshold so that elderly or disabled people who have difficulty moving can move and transfer safely and conveniently in a narrow room. In the indoor environment, where the sedentary culture develops, this study aimed to provide convenience for passengers with fracture diseases, geriatric diseases, and other knee and waist diseases. First, links, seats, armrests, covers, motors, batteries, chargers, controllers, etc. were attached to the frame so that they could be moved and lifted indoors. The product design and structure were designed considering the user's environment and physical characteristics, and IoT functions were added. A driving experiment was performed to confirm the operating performance of the manufactured indoor moving and lifting wheelchair. The performance tests, such as continuous running time, turning radius, maximum actuator load, maximum lift height, sound pressure level, minimum sensing distance of the driving aid sensor, interworking of server and app programs, device compatibility, and duty cycle error rate, were performed. As a result of the test, the built-in wheelchair could achieve the performance test target of each item and operate successfully.

A Evaluation of Emergency Braking Performance for Electro Mechanical Brake using Interior Permanent Magnet Synchronous Motor (매입형 영구자석 동기전동기를 적용한 전기기계식 제동장치의 비상제동 성능평가)

  • Baek, Seung-Koo;Oh, Hyuck-Keun;Park, Joon-Hyuk;Kim, Seog-Won;Kim, Sang-soo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.6
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    • pp.170-177
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    • 2020
  • This study examined the clamping force control method and the braking performance test results of an electromechanical brake (EMB) using braking test equipment. Most of the studies related to EMBs have been carried out in the automotive field, dealing mainly with the static test results for various control methods. On the other hand, this study performed a dynamic performance evaluation. The three-phase interior permanent magnet synchronous motor (IPMSM) was applied to drive the actuator of the EMB, and the analysis was verified by JMAG(Ver. 18.0), which is finite element method (FEM) software. The current control, speed control, and position control were used for clamping force control of the EMB, and the maximum torque per ampere (MTPA) control was applied to the current controller for efficient control. The EMB's emergency braking deceleration performance was tested in the same way as conventional pneumatic brake systems when the wheel of a train rotates at 110 km/h, 230 km/h, and 300 km/h. The emergency braking time, with the wheel stopped completely at the maximum rotational speed, was approximately 73 seconds. The similarity of the braking time and deceleration pattern was verified through a comparison with the performance test results of the pneumatic brake system applied to the next generation high-speed railway vehicle (HEMU-430X).

Safety evaluation of livestock feed by-product fermentation storage tank sweep auger through structural analysis (구조해석을 통한 축산 사료용 부산물 발효 저장탱크 스위프오거의 안전성 평가)

  • Kim, Jun Hee;Woo, Seung Min;Dooyum, Uyeh Daniel;Lee, Dong Hyun;Ha, Yu Shin
    • Proceedings of the Korean Society for Agricultural Machinery Conference
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    • 2017.04a
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    • pp.73-73
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    • 2017
  • 가축의 영양소 요구량 유지, 비육, 증체, 생산, 번식, 계절환경에 따라 달라지는 변동요인을 감안하여 하루 동안에 필요로 하는 영양소 요구량을 충족하도록 여러 종류의 사료를 혼합한 TMR(Total Mixed Ration)사료의 중요성이 커지고 있다. 이에 가축의 생산성 향상(등급 향상)과 축산농가의 영농비용 절감, 생력화를 위해 범용적으로 사용가능한 TMR플랜트의 개발이 반드시 필요하다. 본 연구에서는 사료비절감을 위한 식품부산물 발효탱크의 개발을 통해 발효탱크 밑 부분을 구성하고 있는 스위프오거와 이를 고정하면서 Z축으로 회전하는 고정부를 대상으로 하여 시각화 할 수 있는 FEM 시뮬레이션 기법을 이용하여 작업 중 적용되는 하중에 대해 충분한 구조 안전성을 가지고 있는지 해석하였다. 스위프오거의 재질은 SM45C, 작용하는 하중은 감속기의 출력량, RPM을 이용하여 토크 값을 구하고 조사료와 부산물사료가 포함된 TMR사료의 무게와 스위프오거의 단면적을 이용하여 압력 값을 도출하였다. 하지만 부산물사료가 발효되면서 저장탱크를 통해 배출되기 때문에 전체 사료 무게가 줄어 스위프오거에 작용하는 압력 또한 작아지는 것을 확인하였다. 이에 본 연구에서는 저장탱크에서 TMR사료가 배출되기 직전의 가장 높은 압력 상태를 가정하였다. 이 가정을 통해 토크 값은 $1.4N{\cdot}m$, 압력 값은 43 Mpa으로 나타났고 이를 바탕으로 구조해석을 진행하였다. 그 결과 스위프오거는 고정단 부근에서 최대 폰 미세스 응력 310 Mpa이 발생하여 구조적으로 가장 취약한 것으로 나타났다. 하지만 이는 SM45C의 항복강도인 343 Mpa 보다 낮아 안전한 것으로 분석된다. 또한 사료가 배출되면서 스위프오거에 작용하는 압력이 작아져 폰 미세스 응력도 작아지는 것으로 나타났다.

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Development and performance evaluation of traction system for steep gradient and sharp curve track (급구배 및 급곡선 궤도 추진시스템 개발 및 성능 평가)

  • Seo, Sungil;Mun, Hyung-Suk;Moon, Ji-Ho;Suk, Myung-Eun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.9
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    • pp.493-501
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    • 2016
  • In this study, core technologies of a traction system on a mountain tram operating on the track of mountain road full of sharp curves and steep gradients were developed. In domestic mountain resort areas, sometimes the transportation service is not provided in winter because of ice and heavy snow on roads, so a mountain railway service independent of the climate and geographic conditions is needed. A traction system was designed taking into account of the power of a traction motor to climb the gradient of 120 ‰, which is common in domestic mountainous areas. and power transmission system was designed to consider the installation space for the traction system. In addition, a reduction gear and a propeller shaft were developed. An elastic pinion was developed and applied to the rack & pinion bogie system for steep gradient so that noise and vibration generated by contact between the steel gears could be reduced. Impact comparison tests showed that the vibration level of the elastic pinion is one-third lower than that of previous steel pinion. Independent rotating wheels and axles were developed for the bogie system to operate on the sharp curve of a 10 meter radius. In addition, the band braking system was developed to enhance the braking force during running on the steep gradient. A test for the braking force showed it exerts the required braking force. The performance of the developed core components were verified by the tests and finally they were applied to the bogie system running on the track of steep gradient and sharp curve.