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박제상(Jaesang Park),신창우(Changwoo Shin),원종천(Jongchun Won) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
다양한 전자 장치의 제어 대상으로 전류를 사용하고 있고, DC type이나 PMSM 모터를 사용하는 경우에는 출력 토크를 제어하는 수단으로 전류 측정 값을 되먹임 하는 제어기를 구성하는 것이 보편화 되었다. 이중에서 전류 측정 방법으로 사용되고 있는 션트 저항과 OpAmp의 조합은 이상적인 회로에서는 저항에 흐르는 전압을 측정함으로써 전류를 환산하는데 문제가 되지 않지만, 실제 제품을 만드는 경우에는 션트 저항의 산포나 OpAmp를 구성하는 주변 회로의 구성방법이나 산포로 인해서 OpAmp의 기본 수식적인 모델을 사용할 경우 오차가 발생한다. 이로 인해서 측정한 전류의 값이 실제의 전류 값과는 다른 값을 반환하게 되어서 제어용으로 전류를 측정하는 경우에는 전체 시스템의 출력이나 torque ripple과 같은 문제를 일으키게 된다. 본 연구에서는 정밀 제어를 하는 시스템에서 션트 저항과 OpAmp를 사용하여 전류 측정 시 회로 오차 및 기생 성분에 의한 측정 오차 분석을 위한 정밀 모델링 방법에 대해 제안하였다.
EPS 고장발생시의 Motor Braking Torque 분석
박제상(Jaesang Park),신창우(Changwoo Shin),표종현(Jonghyun Pyo),이진환(Jinhwan Lee),배홍용(Hongyong Bhae) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
Inverter and motor phase failure in PMSM application can generate braking torque. For steering system point of view, once EPS had a fault, driver is interrupted by braking torque to steer. For this reason, UN published regulations on failure condition of steering system in ECE R79. This paper analyzed ECE R79 regulation and the characteristics of braking torque according to failure conditions in electric power steering. In addition, this paper presents a comparison of two types of EPS braking torque. The theoretical results obtained from model are validated using experimental test.
박제상(Park Je-sang),최흥식(Choi Houng-sik),김택훈(Kim Tack-hoon),노정석(Roh Jung-suk) 한국전문물리치료학회 2001 한국전문물리치료학회지 Vol.8 No.2
The purpose of this study was to investigate whether the standing balance could be influenced by the different foot positions. Seventeen patients with hemiplegia were tested for the static and dynamic balance under the different foot positions. In the balance test, subject stood by bearing weight on one foot, and the other foot was positioned in three different positions (symmetric, 45°anterolateral, and anterior position). This study used the Kinesthetic ability trainer (KAT2000) to measure the standing balance. The results were as follows: 1) There were significant differences in the static standing balance in different foot positions with both weight-bearing on the paretic limb and on the nonparetic limb (p<.05). 2) There were also significant differences in the dynamic standing balance in different foot positions with both weight-bearing on the paretic limb and on the nonparetic limb (p<.05). 3) There was a significant difference when the paretic weight-bearing and the nonparetic weight-bearing were compared (p<.01). 4) when the paretic weight-bearing and the nonparetic weight-bearing were compared, anterior foot position showed a significant difference in the dynamic standing balance (p<.05), but 45°anterolateral foot position did not show a significant difference (p>.05). In this study, the standing balance showed a significant difference according to different foot positions in hemiparetic patients, and standing balance was better when they stood by bearing weight on the nonparetic limb. These results indicate that it is a necessary to consider both weight-bearing limb and foot position not only in the rehabilitation program but also in achieving the stability in the independent life.
Dual wound 모터 적용 SbW의 Braking Torque 및 Torque Ripple 보상 방법
박제상(Jaesang Park),신창우(Changwoo Shin),정지현(Jihyun Jung),이진환(Jinhwan Lee) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
In this paper, the braking torque compensation method is presented that reduces average braking torque and torque ripple of the braking torque which is generated from the inverter and motor phase failure. An experimental result is also presented to demonstrate the validity of the proposed method.
운동전략이 기립자세의 기능적 전방 팔뻗기에 미치는 영향
박제상,권오윤,최흥식,김택훈 한국전문물리치료학회 2000 한국전문물리치료학회지 Vol.7 No.1
The purpose of this study is to determine whether movement strategies affect functional forward reach distance in a standing position. Forty-seven healthy subjects were selected for this study: 23 men and 24 women, with an average age of 22.3. Functional forward reach distances were measured as hip strategy and squat strategy(included knee and ankle movement strategy) in a standing position, respectively. The mean values of functional forward reach distance in hip strategy, squat strategy were 33.57㎝, 29.48㎝, respectively. There was significantly difference in functional forward reach distance between hip strategy and squat strategy(p<.001). There was no difference of functional forward reach distance between male and female in hip strategy, but there was significant difference in other strategy(p<.05). These results suggest that movement strategies should be considered during functional forward reach test in standing. Further study is required to determine whether movement strategies affect functional reach distance in elderly and disabled groups.