Deflection angle detection device
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United States of America Patent
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Jun 2, 2020
Grant Date -
Mar 8, 2018
app pub date -
Aug 31, 2017
filing date -
Sep 2, 2016
priority date (Note) -
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Abstract
A deflection angle detection device includes an input shaft encoder, a disk attached to an output shaft of a speed reducer, an output shaft encoder having detection elements disposed at mutually different positions with respect to the disk to detect angular positions of the disk. A basic angular position of the output shaft is calculated based on an angular position of the input shaft detected by the input shaft encoder, a first, a second, and a third angular positions of the output shaft are calculated based on the angular positions of the disk detected by a plurality of detecting elements, and the deflection angle of the output shaft is calculated based on a first, a second, and a third differences, which are differences between the basic angular position and the first, the second, and the third angular positions, respectively, and positions of the detection elements with respect to the disk.
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