• 제목/요약/키워드: motor case

검색결과 1,433건 처리시간 0.03초

Kinematic analysis of rowing exercise using a motor-assisted rowing machine for rowers with spinal cord injury: a case report

  • Jeong, Ju Ri;Lee, Bum Suk;Park, Dae-Sung
    • Physical Therapy Rehabilitation Science
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    • 제3권1호
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    • pp.69-75
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    • 2014
  • Objective: We developed a Motor-Assisted Rowing Machine (MARM) for Spinal Cord Injury (SCI), by modification of the Concept II rowing machine, so that the seats could be operated automatically in a backward and forward direction by a motor. Design: Case report. Methods: Motor rowing consisted of a chair with inclination control, a motor system, control button, monitor, program, leg supporter, safety belt, and seat. The patients were 2 men rowing athletes with SCI, classified as American Spinal Injury Association class B, participated in the study. Level of thoracic injury ranged from T8 to T10. The subjects rowed at a self-selected stroke rate with 50 watts. Two different rowing methods (static rowing without movement of the seat, dynamic rowing using MARM) were assigned to each participant during 10 minutes; 34 reflective markers were attached to their full bodies. Kinematic data were collected using the Vicon motion analysis system. Based on the full body model provided as a default by the equipment. In the rowing exercise, the rowing motions were divided into Drive Phase and Recovery Phase. Results: The two rowing methods differ in handle range, seat range, handle and seat ratio, handle velocity, and seat velocity during static and dynamic rowing. The rowing exercise using a rowing machine developed MARM increased tendency to the range of motion in the dynamic method compared to the static method. Conclusions: The newly developed MARM could be a useful whole body exercise for people with SCI.

감각-운동 중심의 융합 활동을 기초로 한 그룹 작업치료가 초등학교 1학년 부적응아동의 자기조절능력과 실행능력에 미치는 영향: 사례연구 (The Effect of Group Occupational Therapy based on Sensory-Motor Centered Convergence Activities on Self-regulation and Executive Function of Maladapted Children in First Grade Elementary School: A Case Study)

  • 조선영
    • 한국융합학회논문지
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    • 제12권2호
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    • pp.67-75
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    • 2021
  • 본 연구는 초등학교 1학년 부적응 아동을 대상으로 감각과 운동 중심의 융합 활동으로 구성 된 그룹 작업치료 프로그램을 실시하여 자기조절능력, 실행 기능에 미치는 영향을 알아보고자 하였다. 연구 설계는 사전-사후 검사를 통한 사례 연구이며 대상자는 총 3명이다. 사전-사후 검사로 자기 조절 능력 척도와 실행 기능을 알아보기 위해서 운동적 합성 검사를 실시하였다. 감각-운동 중심의 그룹 작업치료 프로그램은 전정 감각, 고유 감각, 촉각이 기초 한 움직임 활동을 하였으며 아동의 활동에 대한 선호도를 조사하여 과제를 선정하였다. 그 결과 대상자 1과 대상자 2 아동은 자기조절 능력, 실행 기능의 향상이 나타났다. 본 연구의 결과를 근거로 하여 교육 현장과 임상이 연계되어 학교의 부적응을 보이는 아동들에게 그룹 중심의 감각-운동 프로그램을 제공하여 학교의 적응 능력 향상을 기대할 수 있을 것을 사료된다.

주거환기용 시로코홴의 내부모터 형상에 따른 공력특성 연구 (A STUDY ON AERODYNAMIC CHARACTERISTICS DEPENDING ON SHAPE OF AN INTERNAL MOTOR IN A SIROCCO FAN FOR RESIDENTIAL VENTILATION)

  • 차경훈;김진혁;김광용
    • 한국전산유체공학회지
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    • 제16권4호
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    • pp.1-6
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    • 2011
  • Aerodynamic characteristics depending on the shape of an internal motor in a small-size sirocco fan for residential ventilation have been investigated. For the aerodynamic analyses of the sirocco fan, three-dimensional Reynolds-averaged Navier-Stokes equations are solved with the shear stress transport model for turbulence closure. The flow analyses are performed on hexahedral grids using a finite-volume solver. The validation of the numerical results at steady-state is performed by comparing with experimental data for the pressure and efficiency. In order to investigate the aerodynamic characteristics depending on shape of an internal motor in a sirocco fan, the reference shape is analyzed compared to the case without internal motor. Additionally, two shape parameters, height and width of the internal motor in a sirocco fan, are tested to investigate their effects on the aerodynamic characteristics. The results show that the shape of the internal motor in a sirocco fan is an important factor to improve the aerodynamic performances.

커패시터 운전 단상 영구자석형 동기전동기 기동특성에 관한 연구 (A Study on the Sterling Characteristics for Capacitor-run Single Phase Permanent Magent Synchronous Motor)

  • 홍선기
    • 조명전기설비학회논문지
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    • 제18권2호
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    • pp.150-156
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    • 2004
  • 단상 전원에 의해 기동되는 영구자석형 단상 동기 전동기는 효율은 높지만, 회전 방향을 결정하기가 어렵다. 본 연구에서는 커패시터 운전 단상 동기 전동기의 기동 특성에 대하여 연구하였다. 고정자는 커패시터 운전 단상 유도기와 동일하지만, 회전자가 영구자석으로 구성된다. 이 경우는 회전자와 고정자 조건에 따라 기동 조건이 결정되고 모터의 회전 방향이 결정될 수 있다. 이 결과에서, 제안된 전동기는 낮은 기동토크를 요구하는 팬과 같은 부하에 적용될 수 있을 것으로 기대된다.

수치해석에 의한 고속팬용 밀폐구조형 BLDC모터의 열신뢰성 분석 (Thermal Reliability Analysis of BLDC Motor in a High Speed Axial Fan by Numerical Method)

  • 문선애;이재헌
    • 설비공학논문집
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    • 제22권3호
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    • pp.130-138
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    • 2010
  • The thermal reliability of the closed-type BLDC motor for the high speed axial fans is analyzed by a numerical method in this paper. Since the module and the motor part are combined in a closed case, the heat generated from a rotor in the motor and the electronic components in the PCB module can not be effectively removed to the outside. Therefore the module will easily fail by high temperature. The accelerated-life testing was accomplished to formulate the life equation and numerical method is used to predict the inside temperature of the PCB module, which is one of the life equation parameter according to the environment. When the environment temperature of BLDC motor is 21, 35 and 50 $^{\circ}C$, the temperature in the PCB space is predicted as 73.4, 87.5 and 102.4 $^{\circ}C$. Then the life time with the temperature are calculated as 2,239, 863 and 328 hours.

주거환기용 시로코홴의 내부모터 형상에 따른 공력특성 연구 (A STUDY ON AERODYNAMIC CHARACTERISTICS DEPENDING ON SHAPE OF AN INTERNAL MOTOR IN A SIROCCO FAN FOR RESIDENTIAL VENTILATION)

  • 차경훈;김진혁;김광용
    • 한국전산유체공학회:학술대회논문집
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    • 한국전산유체공학회 2011년 춘계학술대회논문집
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    • pp.321-326
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    • 2011
  • Aerodynamic characteristics depending on the shape of an internal motor in a small-size sirocco fan for residential ventilation have been investigated For the aerodynamic analyses of the sirocco fan, three-dimensional Reynolds-averaged Navier-Stokes equations are solved with the shear stress transport model for turbulence closure. The flaw analyses are performed on hexahedral grids using a finite-volume solver. The validation of the numerical results at steady-state is performed by comparing with experimental data for the pressure and efficiency. In order to investigate the aerodynamic characteristics depending on shape of an internal motor in a sirocco fan, the reference shape is analyzed compared to the case without internal motor. Additionally, two shape parameters, height and width of the internal motor in a sirocco fan, are tested to investigate their effects on the aerodynamic characteristics. The results show that the shape of the internal motor in a sirocco fan is an important factor to improve the aerodynamic performances.

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운동학습에 따른 대뇌 보조운동영역의 활성화 변화: fMRI 사례연구 (Change of activation of the supplementary motor area in motor learning: an fMRI case study)

  • 박민철;배성수;이미영
    • The Journal of Korean Physical Therapy
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    • 제23권2호
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    • pp.85-90
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    • 2011
  • Purpose: The contribution of the supplementary motor area (SMA) to the control of voluntary movement has been revealed. We investigated the changesin the SMA for motor learning of the reaching movement in stroke patient using functional MRI. Methods: The subject was a right-handed 55 year-old woman with left hemiparesis due to an intracerebral hemorrhage. She performed reaching movement during fMRI scanning before and after reaching training in four weeks. The motor assessment scale and surface EMG were used to evaluate the paretic upper limb function and muscle activation. Results: In the fMRI result, contralateral primary sensorimotor cortex (SM1) was activated before and after training. SMA was only activated after training. In addition, muscle activation of the paretic upper limb was similar to that of the unaffected upper limb after training. Conclusion: These findings suggest SMA is related to the execution of a novel movement pattern resulting in motor learning in stroke patients.

나노급 정밀 구동을 위한 스핀들 모터-척 시스템 설계 (Design of Spindle Motor-chuck System for Ultra High Resolution)

  • 김경호;김하용;신부현
    • 한국소음진동공학회논문집
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    • 제19권6호
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    • pp.614-619
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    • 2009
  • The STW(servo track writing) system which is the process of writing servo signals on disks before assembling in drives uses the spindle motor-chuck mechanism to realize low cost because the spindle motor-chuck mechanism has merit which can simultaneously write multi-disk by piling up disks in hub. Therefore, when the spindle motor-chuck mechanism of horizontal type operates in high rotation speed it is necessary to reduce the effect of RRO(repeatable run-out) and NRRO(non-repeatable run-out) to achieve the high precision accuracy of nano-meter level during the STW process. In this paper, we analyzed that the slip in assembly surfaces can be caused by the mechanical tolerance and clamping force in hub-chuck mechanism and can affect NRRO performance. We designed springs for centering and clamping considering centrifugal force by the rotation speed and assembly condition. The experimental result showed NRRO performance improves about 30 % than case of weak clamping force. The result shows that the optimal design of the spindle motor-chuck mechanism can effectively reduce the effect of NRRO and RRO in STW process.

대형공간환기용 축류팬에 사용되는 밀폐형 모터의 열신뢰성 분석 (Thermal Reliability Analysis of a Closed Type Motor in an Axial Fan for the Large Space Ventilation)

  • 이태구;허진혁;문선애;유호선;문승재;이재헌
    • 대한설비공학회:학술대회논문집
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    • 대한설비공학회 2007년도 동계학술발표대회 논문집
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    • pp.494-499
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    • 2007
  • The thermal reliability of the closed-type BLDC motor for the high speed axial fans is analyzed by a numerical method in this dissertation. Since the module and the motor part are combined in a closed case, the heat generated from a rotor in the motor and the electronic components in the PCB module can not be effectively removed to the outside. Therefore the module will easily fail by high temperature. The accelerated-life testing was accomplished to formulate the life equation and numerical method is used to predict the inside temperature of the PCB module, which is one of the life equation parameter according to the environment. The experiment for measuring the surface heat flux of the electronic components is carried out to apply the boundary condition of numerical study. When the environment temperature of BLDC motor is 21, 35 and $50^{\circ}C$, the temperature in the PCB space is predicted as 73.4, 87.5 and $102.4^{\circ}C$. Then the life time with the temperature are calculated as 2,239, 863 and 328.

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TBM용 대용량 전동기의 기동 특성 및 개선 관한 연구 (A Study on Starting Characteristic and Improvement for High Power Motor with Tunnel Boring Machine)

  • 김태규;안준영
    • 전기학회논문지
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    • 제68권1호
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    • pp.44-51
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    • 2019
  • Tunnel Boring Machine's Technology has depends mostly on imports, currently domestic technology development was proceeding. There are many technologies in this field, above all, the large-capacity motor drive technology required for excavation is one of the core technologies. In particular, when several large motors are simultaneously starting, there are many problems due to a large starting current at that time, and it is difficult to design and operate a power receiving facility. In this paper, A method of reducing the starting current by using the regenerative power generated by the deceleration of the motor has been studied. To verify this proposal, we designed the induction motor controller using CAE based power simulation tool and verified the results of the proposed method by applying the reduced model. As a result, it is possible to reduce the maximum starting current and shorten the start-up time. Moreover, even if several motors are connected to one bank, it is proved that the method can be efficiently operated by using the sequential braking / starting sequence. In the case of a power system in which a large capacity electric motor such as a tunnel excavation system is driven, the results of this study are expected to be a stable and effective method for solving the start-up current problem and designing the power receiving facility.