Electricity: measuring and testing – Magnetic – Displacement
Patent
1995-10-30
1998-01-20
Strecker, Gerald R.
Electricity: measuring and testing
Magnetic
Displacement
318656, 318661, 32420712, 32420718, 341115, 341116, G01B 730, G01D 520, G01D 5243, H03M 164
Patent
active
057105090
ABSTRACT:
Two A.C. output signals amplitude-modulated in accordance with two function values (sine and cosine) differing from each other in correspondence to a position-to-be-detected are received from a position sensor such as a resolver. By performing an addition or subtraction between a signal derived by shifting the electric phase of one of the received A.C. output signals by a predetermined angle, and the other received signal, two electric A.C. signals (sin(.omega.t .+-.d.+-..theta.), sin(.omega.t.+-.d-.theta.)) are electrically synthesized which have electric phase angles (.theta.) corresponding to the position-to-be-detected and are phase-shifted in opposite directions. ".+-.d" here represents phase variation error caused by factors, other than the position-to-be-detected, such as temperature change. In the synthesized two signals, the phase variation errors (.+-.d) appear in the same direction, while the phase differences (.theta.) corresponding to the position are shifted in opposite, positive and negative, directions. Thus, by measuring the respective phase shift amounts (.+-.d.+-..theta., .+-.d-.theta.) and performing appropriate operation, it is allowed to cancel out or extract the error (.+-.d) so that an accurate phase difference (.theta.) can be detected.
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Akatsu Nobuyuki
Goto Atsutoshi
Sakamoto Hiroshi
Sakamoto Kazuya
Tanaka Shuiti
Goto Atsutoshi
Strecker Gerald R.
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