- Volume 21 Issue 6
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Detection of Absolute Position of Robot Joint Using Incremental Encoders
증분형 엔코더를 이용한 로봇 관절의 절대위치 검출
- Received : 2014.12.10
- Accepted : 2015.02.11
- Published : 2015.06.01
This paper proposes an efficient detection of absolute position of a robot joint using two incremental encoders. We considers a robot joint comprising a motor, a reducer, two encoders, and a motor drive. An incremental(first) encoder provides motor's rotor position or input position of reducer while another incremental(second) encoder does output position of the reducer. A table is made where the relationship between the first and the second encoder counts is recorded. The key point is placed where the table is constructed: when a pulse occurs in the second encoder, there exists a corresponding unique count value of the first encoder. The absolute position is detected using the table by searching the second encoder position corresponding to the first encoder count value when a pulse occurs in the second encoder. The proposed method needs a small rotation, as just one second encoder's pulse angle, for the initial absolute position detection.
- K. Kosuge, H. Yoshida, D. Taguchi, T. Fukuda, K. Hariki, K. Kanitani, and M. Sakai, "Robot-human collaboration for new robotic applications," Industrial Electronics, Control and Instrumentation, International Conference on, 1994.
- P. J. Hinds, T. L. Roberts, and H. Jones, "Whose job is it anyway? a study of human-robot interaction in a collaborative task," Human-Computer Interaction, vol. 19, pp. 151-181, 2004. https://doi.org/10.1207/s15327051hci1901&2_7
- Trogny Brogardh, "Present and future robot control development-An industrial perspective," Annual Review in Control, vol. 31, pp. 69-79, 2007. https://doi.org/10.1016/j.arcontrol.2007.01.002
- R. I. Kibrick and C. R. Delaney, "Encoder for measuring both incremental and absolute positions of moving elements," Pat. No. US4736187, USA, 1988.
- J. S. Lim and Y. J. Lee, "Detection method of absolute position of reducer output axis," Pat. No. 10-1461627, Korea, 2014.