CN1731098A - A kind of method that improves the photoelectric encoder angle measurement accuracy - Google Patents
A kind of method that improves the photoelectric encoder angle measurement accuracy Download PDFInfo
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- CN1731098A CN1731098A CN 200410011087 CN200410011087A CN1731098A CN 1731098 A CN1731098 A CN 1731098A CN 200410011087 CN200410011087 CN 200410011087 CN 200410011087 A CN200410011087 A CN 200410011087A CN 1731098 A CN1731098 A CN 1731098A
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Abstract
A kind of method that improves the photoelectric encoder angle measurement accuracy belongs to a kind of method that improves the photoelectric encoder angle measurement accuracy that relates in the photoelectric measurement technical field, and the technical problem to be solved in the present invention is: a kind of method that improves the photoelectric encoder angle measurement accuracy is provided.The technical scheme that solves is: the first step: extract three road photosignals that three tunnel phase place mutual deviations are 120 degree by photoelectric device from code-disc; Second step: become digital quantity signal with being input to A/D converter after the amplification of three road photosignals input prime amplifier.Utilize the characteristics design three-phase adding circuit of three-phase system signal communication component and identically vanishing simultaneously.The AC compounent that the three-phase system signal that amplifies is input to adding circuit monitoring output improves the adjustment precision; The 3rd step: computing machine by three-phase system signal subdivision sequential operation, obtains the digital code corresponding with the angle position with digital quantity signal, has shown the angle measurement accuracy of photoelectric encoder.
Description
One, technical field: the invention belongs to a kind of method that improves the photoelectric encoder angle measurement accuracy that relates in the photoelectric measurement technical field.
Two, technical background: the angle measurement accuracy of scrambler is to weigh one of most important technical indicator of scrambler quality, and it is determining the range of application of scrambler.Past generally wants to improve the precision of scrambler, and the method for employing is usually: raising on the structural design of code-disc and slit, raising shafting precision, raising processing are debug precision, raising signal Processing precision, employing diameter, difference and temperature compensation, employing electronics and are segmented methods such as design.
Be the general electronics divided method in the whole world wherein based on the two-way orthogonal signal with the most approaching prior art of the present invention.This method may be summarized to be following three steps:
The first step: extract two-way orthogonal optical electric signal from code-disc by photoelectric device.
Second step: with the photosignal amplification and by A/D conversion becoming digital quantity.
The 3rd step: computing machine obtains the digital code corresponding with the angle position with the computing of digital quantity follow procedure, and this code has comprised the angle measurement accuracy of scrambler.
The problem that this method exists is: it is bigger that the adjustment of signal is subjected to the human factor function influence, and different people's debug signal effect difference is bigger, the precision height of adjusting, and the bad precision of accent is just poor, the scrambler angle measurement accuracy that the human factor influence is final.
Three, summary of the invention: in order to overcome the defective that prior art exists, the objective of the invention is to overcome the influence of human factor, and can further improve the angle measurement resolving power, set up a kind of new method for this reason to raising photoelectric encoder angle measurement accuracy.
The technical problem to be solved in the present invention is: a kind of method that improves the photoelectric encoder angle measurement accuracy is provided.
The technical scheme of technical solution problem is:
The first step: extract three road photosignals that three tunnel phase place mutual deviations are 120 degree from code-disc by photoelectric device.
Second step: become digital quantity signal with being input to A/D converter after the amplification of three road photosignals input prime amplifier.Utilize the characteristic of three-phase system signal communication component and identically vanishing simultaneously, with three road amplifying signal f
a(θ), f
b(θ), f
c(θ) be input to the three-phase adding circuit of standard.Input signal partly is consistent the DC component of three road signals by the amplifying circuit adjustment, amplitude is consistent, because three road signal first-harmonics to be processed are identical, amplitude equates, DC component is consistent, phase place mutual deviation 120 degree, so be called the three-phase system signal at this.
When the three-phase system signal of standard was imported adding circuit, the output voltage AC compounent was zero.The output signal voltage AC compounent is more little, and input signal differs, amplitude is stable more.The AC compounent of monitoring output provides convenience for adjusting input, can improve the adjustment precision.
The 3rd step: computing machine by three-phase system signal subdivision sequential operation, is seen three-phase system signal subdivision process flow diagram with digital quantity, as shown in Figure 1, at first reads three-phase signal f
a(θ), f
b(θ), f
c(θ) digital quantity, the cancellation DC component is carried out quadrant and is differentiated, and keeps quadrant differentiation result, with three-phase signal f
a(θ), f
b(θ), f
c(θ) digital quantity takes absolute value, obtain and the identical signal of I quadrant rule, calculate the segmentation angle by the I quadrant, differentiate the result according to the quadrant that keeps, add the quadrant modified value, return the segmentation angle value, obtain the digital code corresponding with the angle position, this code has comprised the angle measurement accuracy of scrambler.
Compare with the quadrature segmentation in three-phase segmentation program, quadrant is defined as six.Identical with the quadrature divided method is that all quadrants is relative to each other, and all can segment the angle algorithm by first quartile is θ=arctg (fs/fc), and fs, fc are the quadrature two paths of signals in the formula, and three-phase system signal first quartile segmentation angle algorithm is
S=in the formula (fa (θ)/fb (θ)), other quadrant disposal route is identical with the orthogonal signal disposal route.
Good effect of the present invention: because the three-phase system signal has more 1/3rd than orthogonal signal information, the fundamental frequency signal resolving power also exceeds 1/3rd than orthogonal signal resolving power, and three-phase system signal communication component and perseverance are zero, use this characteristic can improve the adjustment precision of photoelectric encoder.So the scrambler based on the three-phase system signal can further improve segmentation resolving power and precision than the scrambler based on orthogonal signal.
Four, description of drawings: Fig. 1 is a three-phase system signal subdivision program flow diagram among the present invention.
Five, embodiment: implement by the inventive method first step, second step, the 3rd step concrete steps.
Claims (1)
1, a kind of method that improves the photoelectric encoder angle measurement accuracy is to extract photosignal by photoelectric device from code-disc, photosignal is amplified after A/D changes become digital quantity signal, and computing machine is realized the computing of digital quantity follow procedure; It is characterized in that method of the present invention is:
The first step: extract three road photosignals that three tunnel phase place mutual deviations are 120 degree from code-disc by photoelectric device;
Second step: become digital quantity signal with being input to A/D converter after the amplification of three road photosignals input prime amplifier, utilize the characteristic of three-phase system signal communication component and identically vanishing simultaneously, with three road amplifying signal f
a(θ), f
b(θ), f
c(θ) be input to the three-phase adding circuit of standard.Input signal partly is consistent the DC component of three road signals by the amplifying circuit adjustment, and amplitude is consistent;
The 3rd step: computing machine by three-phase system signal subdivision sequential operation, is at first read three-phase signal f with digital quantity
a(θ), f
b(θ), f
c(θ) digital quantity, the cancellation DC component is carried out quadrant and is differentiated, and keeps quadrant differentiation result, with three-phase signal f
a(θ), f
b(θ), f
c(θ) digital quantity takes absolute value, obtain and the identical signal of I quadrant rule, calculate the segmentation angle by the I quadrant, differentiate the result according to the quadrant that keeps, add the quadrant modified value, return the segmentation angle value, obtain the digital code corresponding with the angle position, this code has comprised the angle measurement accuracy of scrambler;
Compare with the quadrature segmentation in three-phase segmentation program, quadrant is defined as six.Identical with the quadrature divided method is that all quadrants is relative to each other, and all can segment the angle algorithm by first quartile is θ=arctg (fs/fc), and fs, fc are the quadrature two paths of signals in the formula, and three-phase system signal first quartile segmentation angle algorithm is
S=in the formula (fa (θ)/fb (θ)), other quadrant disposal route is identical with the orthogonal signal disposal route.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100110879A CN100359290C (en) | 2004-09-08 | 2004-09-08 | Method for improving angle measuring precision of photoelectric encoder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100110879A CN100359290C (en) | 2004-09-08 | 2004-09-08 | Method for improving angle measuring precision of photoelectric encoder |
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| Publication Number | Publication Date |
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| CN1731098A true CN1731098A (en) | 2006-02-08 |
| CN100359290C CN100359290C (en) | 2008-01-02 |
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| CNB2004100110879A Expired - Fee Related CN100359290C (en) | 2004-09-08 | 2004-09-08 | Method for improving angle measuring precision of photoelectric encoder |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101315289B (en) * | 2007-05-28 | 2010-12-01 | 株式会社拓普康 | Absolute angle calculation apparatus |
| CN101709983B (en) * | 2009-10-30 | 2012-04-25 | 大连光洋科技工程有限公司 | On-line actual error compensation system of sine and cosine encoder |
| CN102519422A (en) * | 2011-12-14 | 2012-06-27 | 陕西千山航空电子有限责任公司 | Signal acquisition computing method of synchronizer |
| CN106374931A (en) * | 2016-09-27 | 2017-02-01 | 湖南工业大学 | Rotary transformer signal decoding method adopting single frequency point S transformation |
| CN110702055A (en) * | 2011-07-28 | 2020-01-17 | 约翰内斯·海德汉博士有限公司 | Device and method for measuring an angle |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3322036B2 (en) * | 1994-10-27 | 2002-09-09 | ソニー・プレシジョン・テクノロジー株式会社 | Rotary encoder |
| WO1997007382A1 (en) * | 1995-08-17 | 1997-02-27 | Fanuc Ltd | Method and apparatus for processing angular data from encoder |
| JP2003065802A (en) * | 2001-08-21 | 2003-03-05 | Microsignal Kk | Optical encoder |
| JP2003240607A (en) * | 2002-02-18 | 2003-08-27 | Canon Inc | Electric dividing network of encoder |
-
2004
- 2004-09-08 CN CNB2004100110879A patent/CN100359290C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101315289B (en) * | 2007-05-28 | 2010-12-01 | 株式会社拓普康 | Absolute angle calculation apparatus |
| CN101709983B (en) * | 2009-10-30 | 2012-04-25 | 大连光洋科技工程有限公司 | On-line actual error compensation system of sine and cosine encoder |
| CN110702055A (en) * | 2011-07-28 | 2020-01-17 | 约翰内斯·海德汉博士有限公司 | Device and method for measuring an angle |
| CN102519422A (en) * | 2011-12-14 | 2012-06-27 | 陕西千山航空电子有限责任公司 | Signal acquisition computing method of synchronizer |
| CN106374931A (en) * | 2016-09-27 | 2017-02-01 | 湖南工业大学 | Rotary transformer signal decoding method adopting single frequency point S transformation |
| CN106374931B (en) * | 2016-09-27 | 2019-05-21 | 湖南工业大学 | A kind of signals of rotating transformer coding/decoding method using unifrequency point S-transformation |
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| Publication number | Publication date |
|---|---|
| CN100359290C (en) | 2008-01-02 |
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