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Magnetic absolute encoder

An absolute encoder and magnetic technology, which is applied in the direction of instruments, conversion sensor output, measuring devices, etc., can solve problems such as difficult to improve resolution, and achieve the effect of low resolution

Active Publication Date: 2014-07-16
SANYO DENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the conventional magnetic absolute encoder, there is a problem that it is difficult to increase the resolution in the case of miniaturization.

Method used

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Examples

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Embodiment Construction

[0038] Hereinafter, an example of an embodiment of the magnetic absolute encoder of the present invention will be described in detail with reference to the drawings. figure 1 It is a block diagram schematically showing the configuration of this embodiment. figure 2 is a diagram showing an example of a combination of a rotating shaft and a gear. exist figure 1 and figure 2 In , the frame indicated by symbol 1 is a rotating shaft rotated by a drive source such as a motor. First to third gears 3A, 5A, and 7A constituting a part of the first to third rotation detectors 3 to 7 are fixed to the rotary shaft 1 . The first to third gears 3A, 5A, and 7A are formed of a magnetically permeable material such as iron, and each has a plurality of teeth on the outer peripheral portion. In the following description, the number of teeth of the first gear 3A is N1, the number of teeth of the second gear 5A is N2, and the number of teeth of the third gear 7A is N3. In this embodiment, N1 ...

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Abstract

The present invention provides a magnetic absolute encoder that can improve resolution. The first period determination unit (27) uses the data stored in the fourth angle data storage unit (23), and rotates the rotation axis (1) to newly calculate the fifth angle data at the end of the fourth angle data. Determine in which cycle of m cycles it occurs. The second cycle determining unit (29) determines in which cycle of n cycles of first angle data that occurs in the first determined cycle that the newly calculated fifth angle data occurs. The third cycle determination unit (31) determines in which cycle of the N1 cycles of the first angle data the first angle data occurring at this time occurs based on the first determined cycle and the second determined cycle. The absolute position determining section (33) determines the absolute position based on the third determined period and the digital value of the first angle data.

Description

technical field [0001] The present invention relates to a magnetic type absolute encoder (absoluteencoder) using a rotation detector having a gear fixed to a rotating shaft and having a predetermined number of teeth and detecting a magnetic flux passing through the teeth to output and The position of the tooth correlates to the electrical signal of the magnetic detection element. Background technique [0002] JP-A-11-237256 (Patent Document 1) discloses a rotation detection device that can be used with a magnetic incremental encoder. In addition, JP-A-2008-180698 (Patent Document 2) and the like disclose a magnetic absolute encoder utilizing the basic structure of a magnetic incremental encoder. [0003] Patent Document 1: JP Unexamined Patent Publication No. 11-237256 [0004] Patent Document 2: JP Unexamined Publication No. 2008-180698 [0005] However, in the conventional magnetic absolute encoder, there is a problem that it is difficult to increase the resolution when...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/245
CPCG01D5/04G01D5/2013
Inventor 加藤茂春牧内一浩伊藤昭二宫岛徹山崎智仁鲇泽利明松田正人
Owner SANYO DENKI CO LTD