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Encoder

A technology of encoders and sensors, applied in the field of encoders, can solve the problems of limited improvement of scale resolution and limited precision

Active Publication Date: 2022-03-11
NAT INST OF ADVANCED IND SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The interval of the scale is limited according to the precision of the marking precision or the precision of the sensor that detects the scale, so the improvement of the resolution caused by the scale is also limited

Method used

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Experimental program
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no. 1 approach

[0036] Figure 4 It is a diagram showing a schematic configuration of an encoder according to the first embodiment of the present invention.

[0037] refer to Figure 4, the encoder 10 of the first embodiment has: a dial 20 having a scale 21 disposed on the rotating shaft 15 that is an object of angle measurement and formed at equal intervals in the circumferential direction, detecting the scale 21 and generating a cycle with a period based on the detection. The four sensors 31-34 are the detection signals of sine waves with phases shifted by 90 degrees from each other. Based on the detection signals of the respective sensors 31-34, the interpolation signals (also called angle signals) of the intervals of the interpolation scale are used. The generated interpolation signal generators 41 to 44 and the calculator 50 combine and calculate the interpolation signals of the respective sensors 31 to 34 based on the interpolation signals to obtain an angular position or a rotation an...

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Abstract

The encoder 10 is set as follows: M sensors 31-34, which detect a plurality of components indicating angles arranged on the substrate at predetermined angular intervals to generate a periodic first signal, the M sensors are arranged at predetermined angles, and the predetermined angles is 360 / M×(j‑1) (degrees) and 360 / N×MOD[(k j ‑1) / D] (degrees), where M is an integer above 2, N is the number of components, MOD is a function that outputs the value below the decimal point of the input value, and D is a factor of M or is M but not 1, j is an integer from 1 to M that takes different values ​​from M sensors, k j is an integer from 1 to M; the generators 41-44, for each of the M sensors, generate a second signal based on the first signal, and the second signal is interpolated with a predetermined angular interval; and the arithmetic unit 50, for the M The second signals of the sensors are combined and calculated to obtain the angular position or rotation angle.

Description

technical field [0001] The present invention relates to an encoder for detecting position and angle. Background technique [0002] An encoder is a device that reads graduations at equal angular intervals on a dial to measure positions such as rotation angles and absolute angular positions. The interval of the scale is limited according to the accuracy of the marking precision or the precision of the sensor for detecting the scale, so the improvement of the resolution caused by the scale is also limited. Therefore, the sine wave that is further divided into the minimum scale interval is generated by two analog signals that are mutually shifted by 90 degrees, and the arctan operation of the two analog signals is performed, and the angle is determined by using the interpolation signal representing the angle, so that the resolution promote. [0003] In addition, in order to reduce the marking error of the scale, the installation error of the encoder, etc., a method of arrangin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/244G01D5/245
CPCG01D5/244G01D5/245
Inventor 渡部司
Owner NAT INST OF ADVANCED IND SCI & TECH