CN110470322A - A kind of eddy current type absolute encoder and its working method - Google Patents
A kind of eddy current type absolute encoder and its working method Download PDFInfo
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- CN110470322A CN110470322A CN201910721173.5A CN201910721173A CN110470322A CN 110470322 A CN110470322 A CN 110470322A CN 201910721173 A CN201910721173 A CN 201910721173A CN 110470322 A CN110470322 A CN 110470322A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/003—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring position, not involving coordinate determination
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
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- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The present invention provides a kind of eddy current type absolute encoders, and including an annular coding disk and an annular reading dial, opposite arranged concentric is parallel to each other, are equipped with spacing.Coding disk arranges multiple reflective conductives, is distributed on two concentric annular code channels, and the reflector quantity of two code channels is different.Reading dial is equipped with four groups of planar coils, is distributed on two concentric annular code channels, between two planar coils in every group between be divided into the even-multiple of 1/2 measurement wavelength, between two groups of planar coils between be divided into the odd-multiple of 1/4 measurement wavelength.Planar coil and measuring circuit form integral component.Angle value is obtained by calculating the phase difference of two code channels.A kind of working method of eddy current type absolute encoder is provided simultaneously.The present invention not only may be implemented measurement of absolute angle, and have at low cost, anti-vibration, temperature range it is wide, to magnetic target and the insensitive characteristic of changes of magnetic field, can be applied in Various Complex and strongly disturbing environment.
Description
Technical field
The present invention relates to a kind of non-contact code devices.Specifically a kind of eddy current type absolute encoder and its work side
Method.
Background technique
Encoder is a kind of sensing that Angle Position or angular displacement are converted into electric signal according to certain rules and exported
Device, using extensively, being a kind of common angle and angular position pick up in various swing mechanisms.
According to the difference of playback mode, encoder can be divided into contact and two kinds contactless.Contact encoder by
It is worn in existing, working life is short, unreliable, and it is superseded, and replaced by non-contact code device.Non-contact code
Device has speed height, service life length, reliable operation, thus becomes the first choice in current encoder field.
According to the difference of coding mode, encoder can be divided into two class of increment type and absolute type: incremental encoder is will to revolve
The angular displacement turned is converted into periodic electric impulse signal output, and the size of angular displacement is indicated using the number of pulse.Absolute type
Encoder be each Angle Position (i.e. angle) is converted into the corresponding number of only one, therefore its indicating value only and measurement
When Angle Position it is related, and it is unrelated with the process before measurement.
According to the difference of working principle, non-contact code device mainly has optical-electricity encoder and two kinds of magnetic coder at present
Form.Optical-electricity encoder precision is high, speed is fast, is the mainstream in encoder field.But photoelectric encoder is to environmental requirement
Height, shock resistance is poor, temperature range is relatively narrow.Magnetism encoder is a kind of novel angle or angle displacement measurement sensor,
Principle is to be measured using magnetic resistance or Hall element to the angle or value of angular displacement of the magnetic element of rotation, it have at
This is low, anti-vibration, anticorrosive, antipollution, anti-interference and wide temperature characteristic, can be applied to traditional photoelectric encoder cannot fit
The industrial circle answered.
But magnetic coder is worked based on magnetic induction principle, magnetic signal is measurement medium.Therefore, magnetic coder pair
The magnetic fluctuation of magnetic bodies or environment that surrounding occurs is very sensitive, and performance suppression ratio is more serious, therefore is actually using
In be restricted.
Summary of the invention
The present invention is proposed for defect problem sensitive to magnetic bodies and magnetic fluctuation existing for existing magnetic coder
A kind of eddy current type absolute encoder and its working method based on lateral variable area eddy current effect, using coil in reflective conductive
The current vortex of middle generation realizes the measurement of absolute angle and Angle Position, and not only the cost with magnetic coder is low, anti-vibration, anti-
The characteristic of burn into antipollution, anti-interference and wide temperature, and with unwise to magnetic bodies and changes of magnetic field from working principle
The good characteristic of sense works more stable and reliable under magnetic field environment, thus has wider practicability.
The present invention is achieved by the following technical solutions:
According to an aspect of the invention, there is provided a kind of eddy current type absolute encoder, including relatively concentric and parallel cloth
The annular coding disk and an annular reading dial set are equipped with spacing between the coding disk and reading disk；Wherein:
The surface of the coding disk is set there are two concentric annular code channel a, is respectively disposed with quantity on two annular code channel a
Different multiple reflective conductives；Multiple reflective conductives on the same annular code channel a are of similar shape and size, and along circle
Week is uniformly distributed, and two neighboring reflective conductive is referred to as the measurement wave of the code channel in the corresponding segment angle in interval of circumferencial direction
It is long；Since the reflective conductive quantity on two annular code channel a is different, the measurement wavelength of two annular code channel a is also different；
The surface of the reading dial is equipped with two corresponding with two annular code channel a on coding disk annular code channel b, and
Two annular code channel b are identical as the measurement wavelength of corresponding annular code channel a；It is flat there are four being respectively arranged on two annular code channel b
Planar coil；The shape of four planar coils on the same annular code channel b is identical as size, and four planar coils are divided into two groups,
Two planar coils in each group are divided into the even-multiple of the code channel 1/2 measurement wavelength, two groups of planar lines between circumferencial direction
The odd-multiple of the code channel 1/4 measurement wavelength is divided between the circumferencial direction of circle.
Preferably, measuring circuit is additionally provided on the reading dial, the measuring circuit forms integrated with planar coil
Component for providing pumping signal for all planar coils, while obtaining the running parameter of planar coil and exporting corresponding electricity
Signal, the electric signal is for obtaining tested Angle Position.
Preferably, the measuring circuit uses driver to provide pumping signal and directly output simulation letter for planar coil
Number；The quantity of the driver and the quantity of planar coil are identical, wherein each planar coil respectively corresponds a driver, from
And it can guarantee the high speed for the treatment of process.
Preferably, interface socket is additionally provided on the reading dial, the interface socket connects for external power supply power supply
Enter the output with measurement result.
Preferably, the reflective conductive is metal material, is prepared using PCB production method or using machining side
Method is prepared.
Preferably, the planar coil is prepared using multi-layer PCB production method.
Preferably, the spacing between the coding disk and reading dial is 0.5mm.
Preferably, the outer diameter of the coding disk and reading dial is distinguished same or similar with internal diameter.
According to another aspect of the present invention, a kind of work of eddy current type absolute encoder described in any of the above embodiments is provided
Make method, includes the following steps:
S1, differential processing: the simulation that will be exported after two planar coils excitation on reading dial in each group of planar coil
Signal carries out differential processing (subtracting each other), obtains four tunnel differential waves；
S2 calculates tangent: for the four tunnel differential waves obtained after differential processing, by two on the same annular code channel b
Road differential wave carries out ratio proccessing, to obtain the tangent value of two annular code channel b respectively；
S3 calculates phase: will calculate two tangent values obtained after tangent and carries out arctangent computation respectively, to obtain two
The phase value of a annular code channel b；
S4 calculates phase difference: two phase values obtained after phase will be calculated and carry out differential calculating (subtracting each other), thus
To the phase difference of two annular code channel b；
S5 calculates angle: the phase difference of obtain two annular code channel b after phase difference will be calculated multiplied by fixed constant,
Obtain final measured angle angle value；The constant is directly proportional to the product of measurement wavelength of two annular code channel b, with two annular code channels
The difference of the measurement wavelength of b is inversely proportional, and proportionality coefficient is 1/ (2 π).
The working method of eddy current type absolute encoder according to claim 9, it is characterised in that: further include walking as follows
It is rapid:
S6, communication output: defeated by the interface socket being arranged on reading dial by the measured angle angle value obtained after angle is calculated
Host computer is arrived out.
Compared with prior art, the invention has the following beneficial effects:
Eddy current type absolute encoder provided by the present invention and its working method, not only may be implemented measurement of absolute angle,
And have at low cost, anti-vibration, temperature range it is wide, to magnetic target and the insensitive characteristic of changes of magnetic field, can be applied to
Among Various Complex and strongly disturbing environment.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is eddy current type absolute encoder composed structure schematic diagram provided in the embodiment of the present invention；
Fig. 2 is coding disk composed structure schematic diagram provided in the embodiment of the present invention；
Fig. 3 is reading dial composed structure schematic diagram provided in the embodiment of the present invention；
Fig. 4 is reading dial provided in the embodiment of the present invention and coding disk correspondence diagram；
Fig. 5 is eddy current type absolute encoder working method overall procedure schematic diagram provided in the embodiment of the present invention.
In figure, 1 is coding disk, and 2 be reading dial, 3-1 and 3-2 be respectively two annular code channels on coding disk, 4 are
Reflective conductive, 5 be planar coil, and 6 be measuring circuit, and 7 be interface socket.
Specific embodiment
Elaborate below to the embodiment of the present invention: the present embodiment carries out under the premise of the technical scheme of the present invention
Implement, the detailed implementation method and specific operation process are given.It should be pointed out that those skilled in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.
The embodiment of the invention provides a kind of eddy current type absolute encoder, which includes an annular
Coding disk and an annular reading dial；Wherein:
The outer diameter of the coding disk and reading dial is identical or close as internal diameter, opposite arranged concentric, parallel to each other, apart
One lesser distance, the distance are preferred with 0.5mm or so；
The multiple reflective conductives of the surface layout of the coding disk are distributed on two concentric annular code channel a；It is same
Reflective conductive on annular code channel a is of similar shape and size, is circumferentially uniformly distributed, and two neighboring reflective conductive is in circle
The corresponding segment angle in interval of circumferential direction can be referred to as the measurement wavelength of the code channel；The reflective conductive quantity of two annular code channel a
Difference, therefore the measurement wavelength of two code channels is also different；
The reading dial designs altogether eight planar coils, and is divided into two groups, is distributed in two corresponding with coding disk together
On the annular code channel b of the heart, four planar coils are respectively arranged on each annular code channel b；Four planes on the same code channel
The shape of coil is identical as size, and can and coding disk on correspond to code channel reflective conductive shape it is identical as size, can also
With difference；Four planar coils on the same annular code channel b are divided into two groups again, and every group of two planar coils are in circumferencial direction
Between be divided into the odd-multiple of the code channel 1/2 measurement wavelength, the code channel 1/4 measurement is divided between the circumferencial direction of two groups of planar coils
The odd-multiple of wavelength.
Further, the reflective conductive is metal material, can both be made of PCB technology, can also be using machinery
Processing technology production.
Further, the shape of the reflective conductive can be any regular shape and size.
Further, the planar coil is made of multi-layer PCB technique.
Further, the planar coil can be any regular shape.
Further, it is additionally provided with measuring circuit on the reading dial, forms integral component with planar coil, is all
Planar coil provides pumping signal, while obtaining the running parameter of planar coil and exporting corresponding electric signal, by processing with
Angle to be measured and Angle Position is calculated.
Further, the measuring circuit uses driver to provide pumping signal and directly output simulation letter for planar coil
Number；The quantity of driver and the quantity of planar coil are identical, and the corresponding driver of each planar coil thereby may be ensured that place
The high speed of reason process.
Further, it is additionally provided with interface on the reading dial, the access and measurement result for external power supply power supply
Output.
The embodiment of the present invention provides a kind of working method of above-mentioned eddy current type absolute encoder, course of work packet simultaneously
Differential processing is included, tangent is calculated, calculates phase, calculates phase difference, calculating angle and communication output process.
Detailed process is as follows:
(1) differential processing:
Differential processing is carried out (i.e. for the analog signal exported after two planar coils excitation on reading dial each group
Subtract each other), four tunnel differential waves are obtained, each code channel two-way difference frequency signal can effectively inhibit the interference in spatial point magnetic field, improve
Signal quality improves measurement accuracy and anti-interference ability.
(2) tangent is calculated:
For the four tunnel differential waves obtained after differential processing, the two-way differential wave on the same code channel is subjected to ratio
Processing, obtains the tangent signal of the code channel, can be obtained the two-way tangent value of two code channels.
(3) phase is calculated:
The two-way tangent value obtained after tangent will be calculated and carry out arctangent computation respectively, obtain the phase value of two code channels.
(4) phase difference is calculated:
The phase value for calculating two code channels obtained after phase is subjected to differential calculating (subtracting each other), to obtain two code channels
Phase difference.
(5) angle is calculated:
By the phase difference of two code channels obtained after calculating phase difference multiplied by fixed constant, available final is tested
Angle value；The constant is directly proportional to the product of measurement wavelength of two code channels, and the difference of measurement wavelength of two code channels is inversely proportional, than
Example coefficient is 1/ (2 π).
(6) communication output:
The angle value obtained after angle will be calculated, host computer is output to by interface socket.
It elaborates with reference to the accompanying drawing to the above embodiment of the present invention.
Eddy current type absolute encoder provided in the above embodiment of the present invention, including an annular coding disk 1 and one
The reading dial 2 of a annular forms, as shown in Figure 1, in which:
The outer diameter of the coding disk 1 and reading dial 2 is identical or close as internal diameter, such as outer diameter 60mm, internal diameter 25mm；
Coding disk and reading dial are parallel to each other with respect to arranged concentric；Coding disk and reading dial are at a distance of a lesser distance, with 0.5mm
Left and right is preferred；
The coding disk 1 is as shown in Fig. 2, the multiple reflective conductives 4 of surface layout, are distributed in two concentric annular code channels
On 3-1 and 3-2；Reflective conductive 4 on same annular code channel 3-1 or 3-2 is of similar shape and size, circumferentially
Even distribution, two neighboring reflective conductive 4 are referred to as to measure wavelength in the corresponding segment angle in the interval of circumferencial direction；Two ring codes
Reflective conductive quantity on road 3-1 and 3-2 is different, therefore it is also different to measure wavelength；For example, it is assumed that two annular code channel 3-1 and
The reflective conductive quantity of 3-2 is respectively 36 and 35, then the measurement wavelength of two code channels is respectively λ1=10 ° and λ2=10.286 °；
The reading dial 2 as shown in figure 3, altogether design have eight planar coil 5-1Sp, 5-1Sn, 5-1Cp, 5-1Cn,
5-2Sp, 5-2Sn, 5-2Cp, 5-2Cn, and correspondingly it is divided into two groups with the annular code channel 3-1 and 3-2 on coding disk 1, often
Four planar coils 5 are respectively arranged on a annular code channel 3, wherein 5-1Sp, 5-1Sn, 5-1Cp, 5-1Cn are distributed in ring code
On road 3-1,5-2Sp, 5-2Sn, 5-2Cp, 5-2Cn are distributed on annular code channel 3-2；Four on the same annular code channel 3 are flat
The shape of planar coil 5 is identical as size, and can be with the shape for the reflective conductive 3 for corresponding to code channel 3 on coding disk 1 and size phase
Together, it can also be different；Four coils 5 on the same code channel 3 are divided into two groups again, and every group of two adjacent planar turns 5 are in circle
The odd-multiple of the annular code channel 1/2 measurement wavelength is divided between circumferential direction, two groups of planar coils 5 are divided into this between circumferencial direction
The odd-multiple of the measurement wavelength of code channel 1/4.For example, planar coil 5-1Sp and 5-1Sn, 5-1Cp and 5-1Cn are between circumferencial direction
It is divided into 1/2 measurement wavelength X1Odd-multiple (as λ1/2、3λ1/2、5λ1/ 2 etc.), planar coil 5-2Sp and 5-2Sn, 5-2Cp with
5-2Cn is divided into 1/2 measurement wavelength X between circumferencial direction2Odd-multiple (for example, λ2/2、3λ2/2、5λ2/ 2 etc.)；Two groups flat
Planar coil 5-1Sp and 5-1Sn, 5-1Cp and 5-1Cn are divided into 1/4 measurement wavelength X between circumferencial direction1Odd-multiple (such as λ1/
4、3λ1/4、5λ1/ 4 etc.), two groups of planar coils 5-2Sp and 5-2Sn, 5-2Cp and 5-2Cn are divided into 1/4 survey between circumferencial direction
Measure wavelength X2Odd-multiple (such as λ2/4、3λ2/4、5λ2/ 4 etc.).
In the above-described embodiments, the reflective conductive 4 is metal material, can both be made, and utilized of PCB technology
PCB's covers copper as reflective conductive 4；It can also be made of mechanical processing technique, pass through various conventional machines using metal material
Tool manufacturing process forms the different shape of height.
In the above-described embodiments, the shape of the reflective conductive 4 can be any regular shape, such as rectangle, sector, water chestnut
Shape, trapezoidal etc., pay the utmost attention to fan shape；The reflective conductive 4 can be arbitrary dimension, and paying the utmost attention to its width is the code channel
The 1/2~3/5 of measurement wavelength is preferred.
In the above-described embodiments, the planar coil 5 is made of multi-layer PCB technique.
In the above-described embodiments, the planar coil 5 can be any regular shape, such as rectangle, sector, diamond shape, trapezoidal
Deng；The planar coil 5 can be arbitrary dimension, pay the utmost attention to its width and be preferred for the code channel measures wavelength 1/2 or so.
In the above-described embodiments, it is additionally provided with measuring circuit 6 on the reading dial 2, for mentioning for all planar coils 5
For pumping signal, while obtaining the running parameter of planar coil 5, the corresponding electric signal of output.
In the above-described embodiments, the measuring circuit 6 uses driver to provide pumping signal and direct for planar coil 5
Export analog signal；The quantity of driver is identical as the quantity of planar coil 5, and the corresponding driver of each planar coil 5 is protected
Demonstrate,prove the high speed for the treatment of process.
In the above-described embodiments, it is additionally provided with interface socket 7 on the reading dial, the access for external power supply power supply
With the output of measurement result.
Eddy current type absolute encoder provided in the above embodiment of the present invention, working method, including differential processing, meter
Tangent is calculated, phase is calculated, calculates phase difference, calculating angle and communicate the processes such as output, as shown in Figure 5.
Detailed process is as follows:
(1) differential processing:
For two adjacent planar coils excitation in each group in four groups of planar coils in eight planar coils
The analog signal exported afterwards carries out differential processing (and directly subtracting each other), obtains four tunnel differential waves, each code channel two-way difference frequency letter
Number, it can effectively inhibit the interference in spatial point magnetic field, improve signal quality, improve measurement accuracy and anti-interference ability, it may be assumed that
Δ W1S=W1Sp-W1Sn, Δ W1C=W1Cp-W1Cn
Δ W2S=W2Sp-W2Sn, Δ W2C=W2Cp-W2Cn
(2) tangent is calculated:
It, will be on the same code channel to four tunnel differential wave Δ W1S, the Δ W1C, Δ W2S, Δ W2C obtained after differential processing
Two-way differential wave carry out ratio proccessing, thus respectively obtain two code channels tangent value.That is:
Tan1=Δ W1S/ Δ W1C, Tan2=Δ W2S/ Δ W2C
(3) phase is calculated:
Two-way the tangent value Tan1 and Tan2 obtained after tangent will be calculated respectively and carries out arctangent computation, to respectively obtain
The phase value of two code channels.That is:
Φ 1=arctan (Tan1)=arctan (Δ W1S/ Δ W1C),
Φ 2=arctan (Tan2)=arctan (Δ W2S/ Δ W2C),
(4) phase difference is calculated:
The two-way phase value Φ 1 obtained after phase will be calculated and Φ 2 carries out differential calculating (directly subtracting each other), to obtain
The phase difference of two code channels.That is:
(5) angle is calculated:
The phase difference of two code channels obtained after phase difference will be calculatedIt is available final multiplied by fixed constant k
Measured angle angle value θ；Constant k is directly proportional to the product of the measurement wavelength X 1 of two code channels and λ 2, the measurement wavelength X with two code channels
The difference of 1 and λ 2 is inversely proportional, and proportionality coefficient is 1/ (2 π).That is:
K=(λ 1* λ 2)/[2 π * (λ 1- λ 2)]
(6) communication output:
The angle value obtained after angle, θ will be calculated, host computer is output to by interface socket.
The eddy current type absolute encoder and its working method that the above embodiment of the present invention provides, by an annular coding disk
With an annular reading dial composition, opposite arranged concentric is parallel to each other, at a distance of a lesser distance.Encode panel surface cloth
Multiple reflective conductives are set, are distributed on two concentric annular code channels, the reflector quantity of two code channels is different.Reading dial is set
In respect of eight planar coils, it is distributed on two concentric annular code channels, each code channel is divided into two groups, two in every group again
It is divided into the even-multiple of 1/2 measurement wavelength between planar coil, the odd-multiple of 1/4 measurement wavelength is divided between two groups of planar coils.It is flat
Planar coil is made of PCB technology, thus can form integral component with measuring circuit.By the phase difference for calculating two code channels
To obtain angle value.The eddy current type absolute encoder and its working method that the above embodiment of the present invention provides, not only may be implemented
Measurement of absolute angle, and have at low cost, anti-vibration, temperature range it is wide, to magnetic target and the insensitive spy of changes of magnetic field
Property, it can be applied in Various Complex and strongly disturbing environment.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (10)
1. a kind of eddy current type absolute encoder, it is characterised in that: including relatively concentric and parallel arrangement an annular coding
Disk and an annular reading dial are equipped with spacing between the coding disk and reading dial；Wherein:
The surface of the coding disk is set there are two concentric annular code channel a, is respectively disposed with quantity difference on two annular code channel a
Multiple reflective conductives；Multiple reflective conductives on the same annular code channel a are of similar shape and size, and circumferentially
Even distribution, two neighboring reflective conductive are referred to as the measurement wavelength of the code channel in the corresponding segment angle in interval of circumferencial direction；
The surface of the reading dial is equipped with two corresponding with two annular code channel a on coding disk annular code channel b, and two
Annular code channel b is identical as the measurement wavelength of corresponding annular code channel a；Planar line there are four being respectively arranged on two annular code channel b
Circle；The shape of four planar coils on the same annular code channel b is identical as size, and four planar coils are divided into two groups, each
Two planar coils in group are divided into the even-multiple of the code channel 1/2 measurement wavelength between circumferencial direction, two groups of planar coils
The odd-multiple of the code channel 1/4 measurement wavelength is divided between circumferencial direction.
2. eddy current type absolute encoder according to claim 1, it is characterised in that: be additionally provided with measurement on the reading dial
Circuit, the measuring circuit and planar coil form integral component, provide pumping signal for all planar coils, obtain simultaneously
The running parameter of planar coil simultaneously exports corresponding electric signal, and the electric signal is for obtaining tested Angle Position.
3. eddy current type absolute encoder according to claim 2, it is characterised in that: the measuring circuit use driver for
Planar coil provides pumping signal and directly exports analog signal；The quantity of the driver and the quantity of planar coil are identical,
Wherein each planar coil respectively corresponds a driver.
4. eddy current type absolute encoder according to claim 1, it is characterised in that: be additionally provided with interface on the reading dial
Socket, the interface socket is for the access of external power supply power supply and the output of measurement result.
5. eddy current type absolute encoder according to any one of claim 1 to 4, it is characterised in that: the reflective conductive
For metal material, it is prepared using PCB production method or is prepared using machining process.
6. eddy current type absolute encoder according to any one of claim 1 to 4, it is characterised in that: the planar coil
It is prepared using multi-layer PCB production method.
7. eddy current type absolute encoder according to any one of claim 1 to 4, it is characterised in that: the coding disk and
Spacing between reading dial is 0.5mm.
8. eddy current type absolute encoder according to any one of claim 1 to 4, it is characterised in that: the coding disk and
The outer diameter of reading dial is distinguished same or similar with internal diameter.
9. a kind of working method of eddy current type absolute encoder of any of claims 1-8, it is characterised in that: including
Following steps:
S1, differential processing: the analog signal that will be exported after two planar coils excitation on reading dial in each group of planar coil
Differential processing is carried out, four tunnel differential waves are obtained；
S2 calculates tangent: for the four tunnel differential waves obtained after differential processing, the two-way on the same annular code channel b is poor
Dynamic signal carries out ratio proccessing, to obtain the tangent value of two annular code channel b respectively；
S3 calculates phase: will calculate two tangent values obtained after tangent and carries out arctangent computation respectively, to obtain two rings
The phase value of shape code road b；
S4 calculates phase difference: will calculate two phase values obtained after phase and carries out differential calculating, to obtain two ring codes
The phase difference of road b；
S5 calculates angle: by the phase difference for calculating the two annular code channel b obtained after phase difference multiplied by fixed constant, obtaining
Final measured angle angle value；The constant is directly proportional to the product of measurement wavelength of two annular code channel b, with two annular code channel b
The difference of measurement wavelength be inversely proportional, proportionality coefficient is 1/ (2 π).
10. the working method of eddy current type absolute encoder according to claim 9, it is characterised in that: further include walking as follows
It is rapid:
Communication output: S6 will calculate the measured angle angle value obtained after angle and be output to by the interface socket being arranged on reading dial
Host computer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113739692A (en) * | 2021-08-13 | 2021-12-03 | 连云港杰瑞电子有限公司 | Plane induction type absolute angle sensor based on M sequence |
| CN115355809A (en) * | 2022-10-20 | 2022-11-18 | 宿迁天海数字测控技术有限公司 | Electromagnetic induction displacement sensor device for measuring instrument |
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| CN113739692A (en) * | 2021-08-13 | 2021-12-03 | 连云港杰瑞电子有限公司 | Plane induction type absolute angle sensor based on M sequence |
| CN113739692B (en) * | 2021-08-13 | 2024-03-15 | 连云港杰瑞电子有限公司 | Plane induction type absolute angle sensor based on M sequence |
| CN115355809A (en) * | 2022-10-20 | 2022-11-18 | 宿迁天海数字测控技术有限公司 | Electromagnetic induction displacement sensor device for measuring instrument |
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