CN102914248B - Passive type linear encoder - Google Patents
Passive type linear encoder Download PDFInfo
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- CN102914248B CN102914248B CN201210383323.4A CN201210383323A CN102914248B CN 102914248 B CN102914248 B CN 102914248B CN 201210383323 A CN201210383323 A CN 201210383323A CN 102914248 B CN102914248 B CN 102914248B
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- read head
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Abstract
The present invention relates to linear encoder technical field, particularly a kind of passive type linear encoder; Comprise and be provided with some evenly distributed and quiet chis of the electrode strip that emitting surface shape is identical, provide the signal generator of pumping signal, the slip read head paralleled with quiet chi, modulation signal reception/processor for quiet chi, quiet chi is provided with bus, and bus and slip read head form the two poles of the earth of electric capacity and respond to the modulation signal gone up on slip read head; One end of bus and modulation signal receive/and processor is connected and the modulation signal that bus is responded to is sent to described modulation signal reception/processor; Because slip read head is without the need to power supply with by other wire transmission signal, so slip read head does not need wire to connect completely, therefore the drag chain of fixing cord is eliminated, so not only save cost but also reduce the size of equipment, particularly when long-time, hypervelocity are moved, the present invention substantially increases the reliability of linear encoder.
Description
Technical field
The present invention relates to linear encoder technical field, particularly a kind of passive type linear encoder.
Background technology
Linear encoder is sensor straight-line displacement being converted to electric signal, be the moving body to obtain rectilinear motion amount of movement for the purpose of device.This linear encoder changes corresponding position detection signal by exporting with the slip read head of the moving part being arranged on moving body and the relative position of the quiet chi be arranged on the fixed position of moving body, thus obtains the amount of movement of moving body.
Linear encoder can be divided into contact and contactless two kinds according to playback mode scrambler.Contact is generally not suitable for high-speed motion occasion, poor durability, so not in discussion scope.Contactless linear encoder generally comprises quiet chi and slip read head.Quiet chi has calibration information, and slip read head is generally arranged on testee, moves with testee, by comparing with the calibration information of quiet chi, and output displacement signal.
Tradition as shown in Figure 1 holds grid chi linear encoder, excitation signal generator 2 sends quiet chi to its pumping signal produced, signal demodulating circuit on slip read head 3 accepts the pumping signal of quiet chi transmission and the displacement information that is coupled produces modulation signal, modulation signal is undertaken amplifying by modulation signal reception/processor 4, filtering, demodulation, and then filtering can obtain positional information.In this scheme, slip read head 3 and modulation signal receive/processor 4 between therefore need wire 6 because needs transmit modulation signal, signal demodulating circuit simultaneously on slip read head 3 is because containing signal amplifier, solution mediation filtering circuit, need power supply, wire 6 is also absolutely necessary.
Linear encoder main at present comprises grating scale linear encoder, magnetic railings ruler linear encoder and holds grid chi linear encoder, and these linear encoders are widely used in lathe and automation equipment.But these linear encoders have a significantly not enough and problem, and that is exactly that slip read head all needs to pull a wire for providing electric energy and signal transmission.And because slip read head along with measured object reciprocating, so in practical application often this root wire need to be arranged in drag chain, to prevent from colliding with barrier in motion process.Such scheme not only increases cost, and reduces reliability, and particularly when long-time, hypervelocity are moved, the reliability of drag chain faces a severe test, and often breaks down.
Summary of the invention
The present invention adopts the mode of drag chain to there is the high and problem that reliability is low of cost in order to the slip read head upper conductor solving current existing linear encoder connects, and a kind of passive type linear encoder provided.
For reaching above-mentioned functions, technical scheme provided by the invention is:
A kind of passive type linear encoder, comprise and be provided with some evenly distributed and quiet chis of the electrode strip that emitting surface shape is identical, provide the signal generator of pumping signal, the slip read head paralleled with described quiet chi, modulation signal reception/processor for described quiet chi, described quiet chi is provided with bus, and described bus and described slip read head form the two poles of the earth of electric capacity and respond to the modulation signal gone up on described slip read head; One end and the described modulation signal of described bus receive/and processor is connected and the modulation signal that described bus is responded to is sent to described modulation signal reception/processor.
Preferably, the quantity of described bus is two, and two described buss are parallel to each other.
Preferably, described signal generator and described modulation signal reception/processor are arranged on described quiet chi.
Preferably, the exiting signal generating circuit in the exiting signal generating circuit of described signal generator and described modulation signal reception/processor is same circuit.
Preferably, described slip read head comprises the first electrode read head and the second electrode read head of anti-symmetric shape, and described first electrode read head and described second electrode read head are corresponding with described two buss respectively forms two electric capacity.
Preferably, the shape at described first electrode read head and the described second electrode read head place of matching is sine wave shape.
Beneficial effect of the present invention is: a kind of passive type linear encoder of the present invention, by arranging bus on quiet chi, described bus and slip read head form the two poles of the earth of electric capacity and respond to the modulation signal gone up on described slip read head, thus the modulation signal on described slip read head is sent to described modulation signal reception/processor, because described slip read head is without the need to power supply with by other wire transmission signal, so described slip read head does not need wire to connect completely; Described slip read head along with measured object reciprocating, the drag chain therefore eliminating fixing cord is connected owing to not needing wire, so not only save cost but also reduce the size of equipment, particularly when long-time, hypervelocity are moved, the present invention substantially increases the reliability of linear encoder; In addition in the present invention, signal generator and modulation signal reception/processor are integrated in same parts, and described parts are only connected with quiet chi, adopt fixed installation, without the need to movement, overcome modulation signal reception/processor in prior art and move with measured object.Be in to-and-fro movement state for a long time, during acceleration and deceleration, shock load produced to structure, to the connected modes such as the solder joint of electronic devices and components even the performance of components and parts own constitute a threat to, cause the problem that reliability reduces.
Accompanying drawing explanation
Fig. 1 is the structural representation that tradition holds grid chi linear encoder;
Fig. 2 is structural representation of the present invention;
Fig. 3 is the structural representation of the quiet chi of the present embodiment;
Fig. 4 is the mutual relationship figure of slip read head and quiet chi;
Fig. 5 is modulation signal acceptance/processor structure schematic diagram.
Embodiment
Below in conjunction with accompanying drawing 1 to accompanying drawing 5, the present invention is further elaborated:
A kind of passive type linear encoder as shown in Figure 1, comprise and be provided with some evenly distributed and quiet chis of the electrode strip 1 that emitting surface shape is identical, provide the signal generator 2 of pumping signal, the slip read head 3 paralleled with quiet chi and modulation signal to receive/processor 4 for quiet chi, quiet chi is provided with bus 5, bus 5 and slip read head 3 form the two poles of the earth of electric capacity and respond to the modulation signal gone up on described slip read head 3; One end of bus 5 and modulation signal receive/and processor 4 is connected and the modulation signal that bus 5 is responded to is sent to modulation signal and receive/processor 4.One group of electrode strip 1 is made up of even number of electrodes bar 1, and as two, four, six, eight etc., slip read head 3 corresponds to one group of electrode strip 1.In fig. 3, at the present embodiment, the a group or a cycle is formed by four electrode strips 1, we press A, B, C, D numbering successively four electrode strips 1 in one group of electrode strip for convenience of description, number identical electrode strip 1 by transmission line 7 link together composition one excitation phase, give often organize identical numbering electrode strip 1 on add an amplitude, pumping signal that frequency is identical with phase place, on adjacent numbering electrode strip 1, the phase differential of pumping signal is 90 °, is namely 360 ° are divided equally by the quantity of electrode strip 1 contained by one group of electrode strip.Suppose the first group # be A electrode strip 1 on add the pumping signal that a phase place is 0 °, being then numbered the pumping signal phase place that the electrode strip 1 of B adds is then 90 °, analogizes in proper order, then the pumping signal phase place be numbered on the electrode strip 1 of D is just 270 °; And pumping signal phase place and the first group # that the second group # is the electrode strip 1 of A to be the phase place of the electrode strip 1 of A identical, be also 0 °, the following class is pushed into all groups.If eight electrode strips 1 form one-period, on so each electrode strip 1, the phase differential of pumping signal is 45 degree.
Be arranged on the bus 5 on quiet chi, its effect is the modulation signal that accepts on slip read head 3 and is passed back to be sent to modulation signal reception/processor 4; But because this modulation signal is general very faint, easily be subject to the interference of external noise, in the present embodiment, preferably, modulation signal is designed to the modulation signal of two-pass DINSAR, the modulation signal of two-pass DINSAR is produced by the read head 3 that slides, and adopts Differential Input like this and suppress merit mode noise when signals collecting.As shown in Figure 3, because modulation signal is designed to two paths of differential signals, every road differential signal needs a bus 5 to transmit, so quiet chi needs arrange two parallel to each other and vertical with electrode strip 1 buss 5, and two buss 5 are symmetrical arranged up and down with the center line of electrode strip 1.
In order to realize the modulation signal producing two-pass DINSAR, slip read head 3 comprises the first electrode read head 31 and the second electrode read head 32 of anti-symmetric shape, and as shown in Figure IV, each read head can by the corresponding area induced charge with quiet chi top electrode bar 1.The shape at the first electrode read head 31 and the second electric read head place of matching is sine wave shape, and the cycle of sine is corresponding with the cycle quiet chi often being organized electrode strip 1, and namely length is equal.When slip read head 3 and quiet chi have relative displacement, convert this displacement to phasing degree at one-period
the electric charge V that then the first electrode read head 31 can be responded to
a:
Wherein K is coefficient, and with many because relevant, as pumping signal amplitude, electrode strip 1 area, air gap, air gap specific inductive capacity etc. between quiet chi and slip read head 3, generally under particular design and working environment, K is approximately constant.
The electric charge of induction on the second electrode read head 32
contrary with the symbol that the first electrode read head 31 is responded to:
On first electrode read head 31, the electric charge of induction is reflected back bus 5 corresponding with the first electrode read head 31 on quiet chi, on second electrode read head 32, the electric charge of induction is reflected back bus 5 corresponding with the second electrode read head 32 on quiet chi, then is transferred to modulation signal reception/processor 4 respectively by these two sliver buss 5.
In the present embodiment, the collection of the signal in modulation signal reception/processor 4 is directly connected with quiet grid chi with demodulator circuit, in this circuit, is integrated with the generation circuit of pumping signal, this is because demodulation needs this with signal frequently.Pumping signal occurs to link together with modulation signal demodulation, as shown in Figure 5.Pumping signal occurs there is multiple implementation, namely mimic channel is had also to have the implementation method of digital circuit, object is exactly produce the multichannel periodic signal dividing equally phase differential, adopt sinusoidal signal in the present embodiment, because four electrode strips 1 are one-period, so pumping signal is four tunnels differences is the sine wave of 90 degree; For ensureing signal intensity, the preferential frequency that adopts is greater than 10KHz, and peak-to-peak value is the sine wave of 3 to 15V.On the one hand, this four tunnels pumping signal sends corresponding electrode strip 1 to by the signal transmssion line on quiet grid chi, and on the other hand, the sinusoidal signal of 0 degree and 90 degree phase place is namely sinusoidal passes to signal receiving module 13 with cosine signal simultaneously.
As shown in Figure 5, two-pass DINSAR modulation signal is delivered to signals collecting and amplification module 11 from the bus 5 quiet grid chi respectively, because its signal amplitude is faint, needs to carry out differential amplification, suppress common-mode noise, signal amplitude is brought up to hundreds of millivolt to thousands of millivolt.Signal receiving module 13 receives this amplified modulation signal, and the pumping signal produced with pumping signal generation module 12 is multiplied can splitting driving signal and displacement signal.Be multiplied with sinusoidal excitation signal, signal results comprises trigonometric function and the displacement of pumping signal doubled frequency
cosine function namely
compared with the signal of pumping signal doubled frequency,
be DC quantity, fall high fdrequency component by low-pass filtering module 14, just obtain
similar, amplified modulation signal is multiplied with cosine pumping signal, and signal results comprises trigonometric function and the displacement of pumping signal doubled frequency
sine function namely
compared with the signal of pumping signal doubled frequency,
be DC quantity, fall high fdrequency component by low-pass filtering module 14, just obtain
Displacement is obtained by said method
cosine and sine signal after, just can calculate displacement by various method.Some product directly can accept the output of this cosine and sine signal as scrambler on the market, and this technology is quite ripe, so the present invention repeats no more how to convert displacement signal to cosine and sine signal.
The above embodiment, just preferred embodiments of the present invention, be not limit practical range of the present invention, therefore all equivalences done according to structure, feature and the principle described in the present patent application the scope of the claims change or modify, and all should be included in patent claim of the present invention.
Claims (1)
1. a passive type linear encoder, comprise and be provided with some evenly distributed and quiet chis of the electrode strip (1) that emitting surface shape is identical, for described quiet chi provides the signal generator (2) of pumping signal, the slip read head (3) paralleled with described quiet chi, and modulation signal reception/processor (4), it is characterized in that: so quiet chi is provided with two parallel to each other and perpendicular with electrode strip buss (5), and two buss (5) are symmetrical arranged up and down with the center line of electrode strip (1), described bus (5) and described slip read head (3) form the two poles of the earth of electric capacity and the modulation signal responded on described slip read head (3), concrete described slip read head (3) comprises the first electrode read head (31) and the second electrode read head (32) of anti-symmetric shape, the shape at described first electrode read head (31) and described second electrode read head (32) place of matching is sine wave shape, described first electrode read head (31) and described second electrode read head (32) are corresponding with described two buss (5) respectively forms two electric capacity, for generation of two-pass DINSAR modulation signal, one end of described two buss (5) all receives/processor (4) and is connected and the two-pass DINSAR modulation signal responded to is sent to described modulation signal respectively and receive/processor (4) with described modulation signal, described signal generator (2) and described modulation signal reception/processor (4) are arranged on described quiet chi, and the exiting signal generating circuit of described signal generator (2) and the described modulation signal exiting signal generating circuit received in/processor (4) is same circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210383323.4A CN102914248B (en) | 2012-10-11 | 2012-10-11 | Passive type linear encoder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210383323.4A CN102914248B (en) | 2012-10-11 | 2012-10-11 | Passive type linear encoder |
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| CN102914248A CN102914248A (en) | 2013-02-06 |
| CN102914248B true CN102914248B (en) | 2016-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210383323.4A Expired - Fee Related CN102914248B (en) | 2012-10-11 | 2012-10-11 | Passive type linear encoder |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107806890A (en) * | 2016-09-09 | 2018-03-16 | 西门子公司 | Column type capacitance encoder and apply its motor |
| CN108362206B (en) * | 2018-02-13 | 2024-04-09 | 哈工科讯(沈阳)工业技术研究院有限公司 | Non-contact displacement sensor based on capacitive grating |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4437055A (en) * | 1980-11-21 | 1984-03-13 | Meyer Hans Ulrich | Process for the capacitive measurement of lengths and of angles |
| CN1030588C (en) * | 1991-10-15 | 1995-12-27 | 迈尔·汉斯·乌尔里希 | Capacitive position sensor |
| CN202885767U (en) * | 2012-10-11 | 2013-04-17 | 广东盈动高科自动化有限公司 | Passive type linear encoder |
-
2012
- 2012-10-11 CN CN201210383323.4A patent/CN102914248B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4437055A (en) * | 1980-11-21 | 1984-03-13 | Meyer Hans Ulrich | Process for the capacitive measurement of lengths and of angles |
| CN1030588C (en) * | 1991-10-15 | 1995-12-27 | 迈尔·汉斯·乌尔里希 | Capacitive position sensor |
| CN202885767U (en) * | 2012-10-11 | 2013-04-17 | 广东盈动高科自动化有限公司 | Passive type linear encoder |
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| CN102914248A (en) | 2013-02-06 |
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Inventor after: Zhuang Dejin Inventor after: Du Zhaohui Inventor after: Dong Xiaoxiao Inventor after: Luo Rihui Inventor before: Zhuang Dejin |
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Free format text: CORRECT: INVENTOR; FROM: ZHUANG DEJIN TO: ZHUANG DEJIN DU ZHAOHUI DONG XIAOXIAO LUO RIHUI |
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Granted publication date: 20160302 Termination date: 20161011 |