A conventional absolute encoder consists of multiple tracks and therefore has a large size. Based on the theory of shared control, a new kind of absolute encoder called the shared track Gray encoder is proposed. This encoder has only one track, and the code has the characteristics of Gray code. In this paper, first the working principle of the encoder is introduced and the existence condition of the codes for the shared track Gray encoder is derived. Then the search procedure for the codes using self-developed assembler programs is given. Finally, the pattern of the encoder is presented. Since the shared track Gray encoder has only one track and the code is progressive, it is much smaller in size and higher in accuracy than a conventional one. [S0022-0434(00)01503-3]

Issue Section:
Technical Briefs
Keywords:
encoding, digital control, Gray codes, control equipment, Absolute Encoder, Gray Code, Shared Control, Binary Sequence
Topics:
Shared control
1.
Thyer, G. E., 1991, Computer Numerical Control of Machine Tools, Butler & Tanner Ltd., Oxford, pp. 118–121.
2.
Oono
,
K.
,
Matsumoto
,
T.
, and
Imai
,
M.
, et al.,
1991
, “
One-Track Absolute Encoder
,”
J. Jpn. Soc. Precis. Eng.
,
57
, No.
8
, pp.
1369
–
1374
(in Japanese).
3.
Walcher, H., 1994, Position Sensing, Butterworth-Heinermann Ltd., New York, pp. 117–133.
4.
Wang
,
Q. Y.
, and
Yan
,
X. R.
,
1995
, “
Shared Control Method for Combination State Conversion of Electro-Mechanical Equipment
,”
Chin. J. Mech. Eng.
,
8
, No.
4
, pp.
304
–
308
.
5.
Visme, G. H., 1971, Binary Sequences, The English Universities Press, London.
6.
Yan
,
X. R.
, and
Wang
,
Q. Y.
,
1993
, “
Number of Elements in a Usable Binary Cyclic Sequence and Undulatory Element Distribution
,”
Journal of Northeast University of Technology
,
14
, No.
4
, pp.
383
–
387
(in Chinese).
7.
Yan
,
X. R.
, and
Wang
,
Q. Y.
,
1994
, “
Searching Technology for Schemes of 2-Position Shared Controllers
”
J. Northeastern Univ.
,
15
, No.
4
, pp.
332
–
336
(in Chinese).
8.
Yan
,
X. R.
, and
Wang
,
Q. Y.
,
1994
, “
Research on Shared Control Encoder
,”
Manufact. Technol. Machine Tool
,
7
, No.
4
, pp.
33
–
35
(in Chinese).
9.
Yan, X. R., Wang, Q. Y., and Yasui, T., 1995, “Design of shared controllers for mixed position elements,” Proceedings of 18th International Conference on Computer & Industrial Engineering, China Machine Press, Beijing, pp. 759–762.
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