A new design concept of a multi-turn absolute rotary encoder which is insensitive to the accuracy of encoder components is proposed. This new design does not demand high accuracy of the encoder structure other than the fundamental pattern to produce the least significant digit. The allowable error in the encoder structure is compensated by difference between absolute and incremental encoder pdf light circuits.
This absolute encoder has been applied to the measurement of height position in a cylindrical form-measuring system. The new encoders can be connected in series by reduction gears whose accuracy is fairly rough, so that a multi-turn device in realized. The allowable tolerances in the encoder structure are presented. Check if you have access through your login credentials or your institution.
1988 Published by Elsevier Inc. Absolute shaft position can be calculated from two absolute encoder values. Two absolute encoders are connected to the shaft with different multiplying ratios. Greatest common factor of the multiplying ratios should be equal to or less than 1. Measurement range can be extended by the combinations of the multiplying ratios. Mechatronics systems have become more accurate and compact.
An accurate and compact measurement equipment is also required for this system. An encoder, specifically an absolute encoder, is a major equipment that measures the shaft position. In addition, directly coupling an absolute encoder to the output shaft is still a difficult task in a mechatronics system. This paper proposes a principle that measures the position of the output shaft by combining two absolute encoders connected with the output shaft with different multiplying ratios. The output shaft position is calculated from the combinations of the measured values of the encoders and the multiplying ratios, regardless of power turn-off, interruption, or corruption from electrical transients.
The multiplication of the output shaft rotation improves the resolution of the measurement and requires less space to install. Moreover, the range of measurement can be extended by the combinations of the multiplying ratios. Aside from the principle, the criterion of multiplying ratios is proposed in this paper. The simulations and experiment are conducted to verify the validity of the proposed principle. D division as a senior research engineer. His research field includes design, modelling, and simulation of robot and other mechatronic system.
Convergence Science and Technology from Seoul National University in 2015. He was with Gyoungwoo Systech Inc. Since 2015, he has been with the University of Texas Health Science Center at Houston. His research interests include smart actuator system and its biomedical applications. Seoul National University in 1989 and 1991, respectively. University of Tokyo in 1997.
He was with FANUC Ltd. Since 2000, he has been with Seoul National University. His research interests include actuator-based mechatronic systems, personal mobility, and assistive technology. Google’s machine translation is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. 1947 patent application, remarking that the code had “as yet no recognized name”.
He derived the name from the fact that it “may be built up from the conventional binary code by a sort of reflection process”. The code was later named after Gray by others who used it. A 1954 patent application refers to “the Bell Telephone Gray code”. Other names include “cyclic binary code” and “cyclic progression code”. Many devices indicate position by closing and opening switches. The problem with natural binary codes is that physical switches are not ideal: it is very unlikely that physical switches will change states exactly in synchrony.
In the transition between the two states shown above, all three switches change state. In the brief period while all are changing, the switches will read some spurious position. 011 — 001 — 101 — 100. The Gray code for decimal 15 rolls over to decimal 0 with only one switch change.