Electricity: motive power systems – Positional servo systems – Multiple mode systems
Patent
1989-03-03
1990-05-01
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Multiple mode systems
318594, 318603, 318618, G05B 102
Patent
active
049221752
ABSTRACT:
Disclosed is a position detecting method and apparatus which are suitable for detecting the position of a moving body on the basis of the output of a position detector for generating two-phase periodic waves having a phase difference of a quarter period, the method comprising the steps of: comparing either one of the two-phase periodic waves with a predetermined reference value having hysteresis to thereby obtain a roughly estimated position for every half period of the one periodic wave; analog-to-digital converting the two-phase periodic waves and a zero-cross value for every sampling period to thereby obtain a finely estimated position; and detecting the position of the moving body on the basis of the roughly estimated position and the finely estimated position while correcting an error due to the hysteresis at the starting point of the roughly estimated position, by use of the relationship between the roughly estimated position and the finely estimated position. According to this method/apparatus, continuity between the roughly estimated position and the finely estimated position can be maintained, so that exact and high-resolution position detection can be performed.
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Miyashita Kunio
Morinaga Shigeki
Sugai Hiroshi
Sugiura Yasuyuki
Watabe Mitsuru
Hitachi , Ltd.
Ip Paul
Shoop Jr. William M.
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