CN203116756U - Angle magnetic encoder and electronic water meter - Google Patents
Angle magnetic encoder and electronic water meter Download PDFInfo
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- CN203116756U CN203116756U CN 201320010700 CN201320010700U CN203116756U CN 203116756 U CN203116756 U CN 203116756U CN 201320010700 CN201320010700 CN 201320010700 CN 201320010700 U CN201320010700 U CN 201320010700U CN 203116756 U CN203116756 U CN 203116756U
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Abstract
The utility model relates to an angle magnetic encoder and an electronic water meter. The angle magnetic encoder comprises a digital rotating wheel, a permanent magnet coaxially installed with the digital rotating wheel, a tunnel magnetic resistance angular displacement sensor and a digital processing circuit. In the encoder, the tunnel magnetic resistance angular displacement sensor is located in a detection surface of the permanent magnet and within a specific radius range area of a permanent magnet cylindrical ring axis. In the specific radius range area, the rotating magnetic field phase angle of a component of a magnetic field generated by the permanent magnet in the detection surface and the rotating phase angle of the permanent magnet are in a linear variation relationship. The angle magnetic encoder and the electronic water meter provided by the utility model have the advantages of small size and high measurement precision.
Description
Technical field
The utility model relates to a kind of permanent magnet of field of measuring technique, specifically relate to a kind of permanent magnet that is applicable to the angle magnetic coder, comprise angle magnetic coder and the electronic water meter of this permanent magnet.
Background technology
Along with the fast development of sensor technology, traditional mechanical water meter is gradually to the electronic water meter transition of novelty.In various sensor technologies, what the photoelectric coding technology can realize digital counting runner code directly reads metering, and does not need accumulation, thereby is used widely.But this technology ubiquity carry error code phenomenon, and to the poor anti jamming capability of factors such as bubble, high light, dirt, seepage.Compare with the photoelectric coding technology, angle magnetic coding techniques resolution is higher, no-carry error code phenomenon, and good stability, and can eradicate the various bad errors that photoelectric technology causes fully, become a kind of coding techniques of alternative photoelectric coding.Angle magnetic coding techniques is by encoding to obtain metering reading to the digital counting runner, its principle is that the rotating magnetic field phase place of utilizing magnetoresistive transducer such as tunnel magnetoresistive angular displacement sensor to respond to the annular permanent magnet that is installed on the digital counting runner is measured corner and the position of runner, and adopts electronic technology to be transformed into the respective digital reading.
The measuring accuracy of angle magnetic coding techniques depends on the performance characteristic of magnetosensitive angular displacement sensor and two ingredients of permanent magnet.Compare with Hall element, magnetoresistive transducer such as tunnel magnetoresistive sensor have higher magnetic field sensitivity, and its power consumption and size also can reduce greatly.The tunnel magnetoresistive angular displacement sensor comprises two mutually orthogonal tunnel magnetoresistive sensors.The magnetic field that two sines that tunnel magnetoresistive angular displacement sensor when work forms and cosine output and permanent magnet detect the generation of magnetic-field component permanent magnet in detection faces component and tunnel magnetoresistive angular displacement sensor sensitive axes between the rotating magnetic field angle phi that forms, be also referred to as herein and survey the phasing degree, magnetic field, concern as follows:
OUT1=COS（φ）
OUT2=SIN（φ）
Utilize arctan function, just can calculate rotating magnetic field angle phi angle according to output OUT1 and the OUT2 of tunnel magnetoresistive angular displacement sensor:
φ=ATAN（OUT2/OUT1）。
Permanent magnet is its rotatable phase angle α in rotary course, is defined as permanent magnet phasing degree of the position vector point r of process of passing through tunnel magnetic resistance angular displacement sensor successively in rotary course, and the detection magnetic-field component of permanent magnet makes the tunnel magnetoresistive angular displacement sensor produce induction.Between permanent magnet rotatable phase angle α and rotating magnetic field angle phi, form linear relationship, satisfy in 0 ~ 360 ° of scope one by one at once, just the rotating magnetic field angle phi that the tunnel magnetoresistive angular displacement sensor can be surveyed and permanent magnet rotatable phase angle alpha position relation is mapped.For example spaced apart with equidistant angle step on the circumference of a certain diameter of runner in order to make these 10 of 0-9 represent numeral, the scope with α is divided into 10 intervals in advance, each interval numeral with an expection.By the permanent magnet angle is encoded, and then transform by electronic technology, can realize the direct output of meter reading.
Therefore, tunnel magnetoresistive angle magnetic coder technology design performance for permanent magnet when being applied to electronic water meter will have specific (special) requirements, and the permanent magnet that existing angle magnetic coder adopts has following shortcoming:
(1) existing angle magnetic coder mostly adopts Hall element as angular transducer, the detection magnetic-field component of its correspondence is that the magnetic field of permanent magnet generation is perpendicular to the component of detection faces, and the detection magnetic-field component of tunnel magnetoresistive angular displacement sensor correspondence is the component of magnetic field in detection faces, and the permanent magnet of therefore existing angle magnetic coder can not be satisfied with the requirement of tunnel magnetoresistive angular displacement sensor magnetic-field measurement.
(2) general what adopt is the solid cylinder design to existing angle magnetic coder permanent magnet, and electronic water meter is for reduce installing space as far as possible, and requiring permanent magnet is that annular is in order to be directly installed on the runner.
The utility model content
The purpose of this utility model is to overcome the above-mentioned shortcoming that exists in the prior art, a kind of permanent magnet that is applicable to the angle magnetic coder is provided, enable to be installed on the electronic water meter runner, save installing space, and can satisfy the requirement of linear relationship between rotating magnetic field angle phi between tunnel magnetoresistive angular displacement sensor and the detection faces internal magnetic field component and the permanent magnet rotatable phase angle α, thereby improve the measuring accuracy of angle magnetic coder.
According to an aspect of the present utility model, a kind of angle magnetic coder is provided, this angle magnetic coder comprises:
The numeral runner;
With the coaxial mounted permanent magnet of described digital runner,
The tunnel magnetoresistive angular displacement sensor is positioned on the described permanent magnet detection faces and is used for magnetic field that the described permanent magnet of sensing produces at the component of this detection faces and exports sensing signal, and
Digital processing circuit is used for calculating and export the code that characterizes the described digital runner anglec of rotation according to the sensing signal from described tunnel magnetoresistive angular displacement sensor,
It is characterized in that,
This permanent magnet has the column circular ring structure, and comprises first permanent magnet unit and second permanent magnet unit, and how symmetrical described first permanent magnet unit and second permanent magnet unit be with respect to section of diameter,
The magnetization of the magnetization of described first permanent magnet unit and second permanent magnet unit is parallel to the axial of column annulus, and direction is opposite, or
The magnetization of the magnetization of described first permanent magnet unit and second permanent magnet unit is perpendicular to described section of diameter, and the parallel unanimity of direction,
Described tunnel magnetoresistive angular displacement sensor is positioned at the detection faces of described permanent magnet apart from the zone of permanent magnet column annulus axle center certain radius scope, in the zone of this certain radius scope, rotating magnetic field phasing degree and the permanent magnet rotatable phase angle of the component of magnetic field in detection faces that described permanent magnet produces are the linear changing relation.
Preferably, described tunnel magnetoresistive angular displacement sensor comprises the single shaft rotation sensor of two orthogonal settings or the Hui Sitong bridge twin shaft rotation sensor of 90 degree rotations relative to each other.
Preferably, the corresponding detection faces of described permanent magnet is positioned at column annulus end face the place ahead and is parallel to end face.
Preferably, the distance between the column annulus end face of described tunnel magnetoresistive angular displacement sensor place detection faces and described permanent magnet is 1-5mm.
Preferably, the magnetization size of the magnetization of described first permanent magnet unit and second permanent magnet unit is identical.
Preferably, the external diameter of described permanent magnet column circular ring structure is 3-200mm, and internal diameter is 1-100mm, highly is 1-50mm.
Provide a kind of electronic water meter more on the one hand according to of the present utility model, comprise a plurality of counting units and digital processing circuit,
Described each counting unit comprises:
The digital counting runner that is connected with rotation axis,
With the coaxial mounted permanent magnet of described digital counting runner and
The tunnel magnetoresistive angular displacement sensor is positioned on the described permanent magnet detection faces and is used for magnetic field that the described permanent magnet of sensing produces at the component of this detection faces and exports sensing signal,
Digital counting runner rotating cycle in the adjacent counting unit is N:1, and N is the integer greater than 1,
Described digital processing circuit is connected with each tunnel magnetoresistive angular displacement sensor, and the output of described tunnel magnetoresistive angular displacement sensor is converted to digital reading,
This permanent magnet has the column circular ring structure, and comprises first permanent magnet unit and second permanent magnet unit, and described first permanent magnet unit and second permanent magnet unit are symmetrical with respect to section of diameter geometry,
The magnetization of the magnetization of described first permanent magnet unit and second permanent magnet unit is parallel to the axial of column annulus, and direction is opposite, or
The magnetization of the magnetization of described first permanent magnet unit and second permanent magnet unit is perpendicular to described section of diameter, and the parallel unanimity of direction,
Described tunnel magnetoresistive angular displacement sensor is positioned at the detection faces of described permanent magnet apart from the zone of permanent magnet column annulus axle center certain radius scope, in the zone of this certain radius scope, rotating magnetic field phasing degree and the permanent magnet rotatable phase angle of the component of magnetic field in detection faces that described permanent magnet produces are the linear changing relation.
Preferably, described tunnel magnetoresistive angular displacement sensor comprises the single shaft rotation sensor of two orthogonal settings or the Hui Sitong bridge twin shaft rotation sensor of 90 degree rotations relative to each other.
Preferably, this electronic water meter further comprises the interface of checking meter that is connected with described digital processing circuit.
Preferably, the corresponding detection faces of described permanent magnet is positioned at column annulus end face the place ahead and is parallel to end face, and the distance between the column annulus end face of described permanent magnet is 1-5mm.
Preferably, the magnetization size of the magnetization of described first permanent magnet unit and second permanent magnet unit is identical.
Preferably, the external diameter of described permanent magnet column circular ring structure is 3 ~ 20mm, and internal diameter is 1 ~ 15mm, highly is 1 ~ 10mm.
Preferably, this electronic water meter comprises 2-10 counting unit.
Preferably, the digital counting runner rotating cycle ratio in the adjacent counting unit is 10:1.
The utlity model has following beneficial effect:
1) the column circular ring-shaped permanent-magnet body of the utility model employing is simple in structure, can directly be embedded in the water meter numeral runner, reduces the requirement to installing space.
2) the column circular ring-shaped permanent-magnet body of the utility model employing comprises two simple permanent magnet unit, and its magnetization configuration is simple, is easy to realize.
3) the column circular ring-shaped permanent-magnet body of the utility model employing exists in detection faces and detects the particular detection zone that has linear relationship between magnetic-field component rotatable phase angle and the permanent magnet rotatable phase angle, satisfies the measurement requirement of tunnel magnetoresistive angular displacement sensor.
4) the column circular ring-shaped permanent-magnet body of the utility model employing, detection faces and end face distance, the particular detection zone in the detection faces can change in a big way with the distance in axle center, makes that the installing space of tunnel magnetoresistive angular displacement sensor is comparatively flexible.
5) have little volume and high measuring accuracy according to magnetic coder of the present utility model and electronic water meter.
Description of drawings
Fig. 1 is the top view according to the permanent magnet of the utility model embodiment 1.
Fig. 2 is the side view of permanent magnet shown in Figure 1.
Fig. 3 is the top view according to the permanent magnet of the utility model embodiment 2.
Fig. 4 is the side view of permanent magnet shown in Figure 3.
Fig. 5 is according to the installation site top view of permanent magnet of the present utility model with respect to the tunnel magnetoresistive angular displacement sensor.
Fig. 6 is according to the installation site side view of permanent magnet of the present utility model with respect to the tunnel magnetoresistive angular displacement sensor.
Fig. 7 is the three-dimensional magnetic field vector distribution plan of permanent magnet in detection faces of embodiment 1.
Fig. 8 is the interior rotating magnetic field angle phi of magnetic-field component and the typical linear relationship figure of permanent magnet rotatable phase angle α of detecting of the permanent magnet detection faces of embodiment 1.
Fig. 9 is the interior rotating magnetic field angle phi of magnetic-field component and the nonlinear relationship curve map of permanent magnet rotatable phase angle α of detecting of the permanent magnet detection faces of embodiment 1.
Figure 10 be detect in the permanent magnet detection faces of embodiment 1 the rotating magnetic field angle phi of magnetic-field component and permanent magnet rotatable phase angle α between linear and non-linear between graph of a relation.
Figure 11 is the interior magnetic-field component magnetic field amplitude Bx-y of detection of the permanent magnet detection faces of embodiment 1 and permanent magnet rotatable phase angle [alpha] graph of a relation.
Figure 12 is in the permanent magnet detection faces of embodiment 1, detects the Straight Line Fitting Parameters R of rotating magnetic field angle phi and the permanent magnet rotatable phase angle α relation of magnetic-field component
2With the tunnel magnetoresistive angular displacement sensor apart from axle center relative position r/Ro graph of a relation.
Figure 13 is in the permanent magnet detection faces of embodiment 1, and the canonical magnetic field amplitude of detection magnetic-field component and tunnel magnetoresistive angular displacement sensor are apart from axle center relative position r/Ro graph of a relation.
Figure 14 is the three-dimensional magnetic field vector distribution plan of permanent magnet in detection faces of embodiment 2.
Figure 15 is the interior rotating magnetic field angle phi of magnetic-field component and the typical linear relationship figure of permanent magnet rotatable phase angle α of detecting of the permanent magnet detection faces of embodiment 2.
Figure 16 is the interior rotating magnetic field angle phi of magnetic-field component and the nonlinear relationship figure of permanent magnet rotatable phase angle α of detecting of the permanent magnet detection faces of embodiment 2.
Figure 17 be the rotating magnetic field angle phi of rotation magnetic-field component in the permanent magnet detection faces of embodiment 2 and permanent magnet rotatable phase angle α between linear and non-linear between graph of a relation.
Figure 18 is interior magnetic field amplitude Bx-y and the permanent magnet rotatable phase angle [alpha] graph of a relation that detects magnetic-field component of the permanent magnet detection faces of embodiment 2.
Figure 19 is in the permanent magnet detection faces of embodiment 2, detects the rotating magnetic field angle phi of magnetic-field component and the Straight Line Fitting Parameters R of permanent magnet rotatable phase angle α
2With the graph of a relation of tunnel magnetoresistive angular displacement sensor apart from axle center relative position r/Ro.
Figure 20 is in the permanent magnet detection faces of embodiment 2, and the canonical magnetic field amplitude of detection magnetic-field component and tunnel magnetoresistive angular displacement sensor are apart from axle center relative position r/Ro graph of a relation.
Figure 21 is the electronic water meter structural representation.
Embodiment
Below with reference to accompanying drawings and in conjunction with specific embodiments the utility model is described in detail.
Embodiment 1
Fig. 1 and Fig. 2 schematically show the synoptic diagram according to the permanent magnet 100 of the utility model embodiment 1.Permanent magnet 100 is column annulus geometry, comprises permanent magnet unit 101 and permanent magnet unit 102, and permanent magnet unit 101 and permanent magnet unit 102 are with section of diameter 110 how much symmetries.The magnetization 103 of permanent magnet unit 101 and the magnetization 104 of permanent magnet unit 102 are along the axis direction antiparallel.Preferably, the magnetization 104 sizes of the magnetization 103 of described permanent magnet 101 and permanent magnet unit 102 are identical.
Those skilled in the art can design the size of permanent magnet 100 as required.Preferably, the internal diameter of the column annulus of permanent magnet 100 is 1-100mm, and the external diameter of column annulus is 3-200mm, and the height of column annulus is 1-50mm.
The detection faces 120 of permanent magnet 100 correspondences is positioned at column annulus end face the place ahead and is parallel to end face.Preferably, the distance between this detection faces 120 and the column annulus end face is 1-5mm.Herein, permanent magnet 100 corresponding detection magnetic-field components 121 are the component of magnetic field in detection faces 120 of permanent magnet generation.Herein, corresponding particular detection zone 122 is positioned at the zone apart from column annulus axle center certain radius scope in the detection faces 120, in this particular detection zone, rotatable phase angle and the permanent magnet 100 rotatable phase angles of detecting magnetic-field component 121 have the linear change feature, and this will specifically describe hereinafter.
Preferably, the composition material of permanent magnet 100 is Alnico.Replacedly, the composition material of permanent magnet 100 is ferrite ceramics material MO6Fe
2O
3, M is Ba, Sr or both combinations.Replacedly, the composition material of permanent magnet 100 is RECo
5, RE=Sm and/or Pr; RE
2TM
17, RE=Sm, TM=Fe, Cu, Co, Zr and/or Hf and RE
2TM
14B, RE=Nd, Pr and/or Dy, TM=Fe and/or Co.Replacedly, the composition material of described permanent magnet 100 is FeCrCo alloy or NbFeB alloy.Preferably, the complex that forms of described permanent magnet 100 powder that is above-mentioned permanent magnet material and plastics, rubber or resin etc.
Embodiment 2
Fig. 3 and Fig. 4 schematically show the synoptic diagram according to the permanent magnet 300 of the utility model embodiment 2.Permanent magnet 300 is column annulus geometry, comprises permanent magnet unit 301 and permanent magnet unit 302, and permanent magnet unit 301 and permanent magnet unit 302 are with section of diameter 310 how much symmetries.The magnetization 303 of permanent magnet unit 301 and the magnetization of permanent magnet unit 302 304 is along perpendicular to the parallel unanimity of section of diameter direction.Preferably, the magnetization 304 sizes of the magnetization 303 of described permanent magnet unit 301 and permanent magnet unit 302 are identical.
Those skilled in the art can design the size of permanent magnet 300 as required.Preferably, the internal diameter of the column annulus of permanent magnet 300 is 1-100mm, and the external diameter of column annulus is 3-200mm, and the height of column annulus is 1-50mm.
The detection faces 320 of permanent magnet 300 correspondences is positioned at column annulus end face the place ahead and is parallel to end face.Preferably, the distance between this detection faces 320 and the column annulus end face is 1-5mm.Herein, permanent magnet 300 corresponding detection magnetic-field components 321 are the component of magnetic field in detection faces 320 of permanent magnet generation.Herein, corresponding particular detection zone 322 is positioned at the zone apart from column annulus axle center certain radius scope in the detection faces 320, in this particular detection zone, rotatable phase angle and the permanent magnet 300 rotatable phase angles of detecting magnetic-field component 321 have the linear change feature, and this will specifically describe hereinafter.
Preferably, the composition material of permanent magnet 300 is Alnico.Replacedly, the composition material of permanent magnet 300 is ferrite ceramics material MO6Fe
2O
3, M is Ba, Sr or both combinations.Replacedly, the composition material of permanent magnet 300 is RECo
5, RE=Sm, Pr, or RE
2TM
17, RE=Sm, TM=Fe, Cu, Co, Zr, Hf and RE
2TM
14B, RE=Nd, Pr, Dy, TM=Fe, Co.Replacedly, the composition material of described permanent magnet 300 is FeCrCo alloy or NbFeB alloy.Preferably, the complex of formation such as described permanent magnet 300 permanent magnet alloy material powders and plastics, rubber or resin.
Embodiment 3
Embodiment 3 is according to a kind of angle magnetic coder of the present utility model, comprises the digital runner that can pivot, and is embedded in the permanent magnet in the digital runner, tunnel magnetoresistive angular displacement sensor and digital processing circuit.Permanent magnet is according to permanent magnet of the present utility model.The tunnel magnetoresistive angular displacement sensor is positioned on the described permanent magnet detection faces, be used for magnetic field that the described permanent magnet of sensing produces in this detection faces component and export sensing signal.The tunnel magnetoresistive angular displacement sensor is disposed in the interior zone apart from permanent magnet column annulus axle center certain radius scope of detection faces of permanent magnet, in the zone of this certain radius scope, rotating magnetic field angle phi and the permanent magnet rotatable phase angle α of the component of magnetic field in detection faces that described permanent magnet produces are the linear changing relation.Digital processing circuit is used for calculating and export the code that characterizes the described permanent magnet anglec of rotation according to the sensing signal from described tunnel magnetoresistive angular displacement sensor.
Fig. 5 and Fig. 6 are respectively top view and the side view of permanent magnet 100,300 and tunnel magnetoresistive angular displacement sensor 500 installation sites among the embodiment 3, and detection faces 120,320 is d apart from the permanent magnet end face distance.Be that initial point is set up the X-Y coordinate system in detection faces 120,320 with the permanent magnet axle center, as shown in Figure 5.The column annulus inside radius of supposing permanent magnet 100,300 is Ri, and external radius is Ro, and thickness is t, and the position vector of tunnel magnetoresistive angular displacement sensor 500 in detection faces 120,320 is that (x, y), its position angle with respect to X-axis is α to r.Suppose that (Bx, By) orientation angles is β for the detection magnetic-field component Bx-y at r place.The calculated relationship of angle [alpha] and angle beta is as follows:
α＝atan(y/x)-π，(x<0，y<0)，
β＝atan(By/Bx)-π，(Bx<0，By<0)，
α and β change between (180 °, 180 °).
Tunnel magnetoresistive angular displacement sensor 500 measured for detecting the included angle=β-α of magnetic-field component Bx-y and its sensitive axes.
When the angle magnetic coder is worked, tunnel magnetoresistive angular displacement sensor 500 keeps fixing, and permanent magnet 100,300 around the axle center rotation, then detection plane is interior is the center of circle with the initial point, r is each point process of passing through tunnel magnetic resistance angular displacement sensor 500 successively on the circle of radius, and produces rotating magnetic field, and its phase place and amplitude are measured by tunnel magnetoresistive angular displacement sensor 500.This is equivalent to permanent magnet 100,300 and keeps fixing, and tunnel magnetoresistive angular displacement sensor 500 moves to diverse location point and measurement detection magnetic field on the circumference successively.Then this moment, the permanent magnet rotatable phase is α, and the rotating magnetic field phase place is φ.
Fig. 7 is the three-dimensional magnetic field polar plot of permanent magnet 100 on detection plane 120, by two-dimensional magnetic field component Bx-y distribution characteristics in the detection plane 120 is calculated, can obtain r (0, the relation of rotating magnetic field phase and permanent magnet rotatable phase α when Ro) changing in the scope, its relation can be linear relationship, nonlinear relationship or between linear and non-linear between relationship characteristic.For example, the typical linear relationship of curve 18 shown in Figure 8 for occurring between rotating magnetic field phase and the permanent magnet rotatable phase α, the typical non linear relation of curve shown in Figure 9 19 for occurring between rotating magnetic field phase and the permanent magnet rotatable phase α, curve 20 shown in Figure 10 for may occur between rotating magnetic field phase and the permanent magnet rotatable phase α between linear and non-linear between relationship characteristic.Figure 11 is rotating magnetic field amplitude Bx-y and anglec of rotation α graph of a relation, curve 21.Found out that by curve 21 the rotating magnetic field amplitude is cycle W deformationization, the maximal value that it is corresponding and minimum value are B
H, B
LFor magnetoresistive angle-sensor configuration, wish that permanent magnet fluctuation of magnetic field amplitude in rotary course is as far as possible little, unaffected to guarantee sensor signal.
Adopt linear function to come match such as Fig. 8, concern between the φ shown in 9,10 and the α, and calculate its linear fit parameters R
2, R
2More more good near 1 expression linearity.
Magnetic field degree of fluctuation shown in the curve 21 can adopt following relational expression to characterize:
normalized?B＝B
pp/B
L＝(B
H-B
L)/B
L
Normalized B numerical value is more little, shows that the magnetic field fluctuation is more little.
In order to determine zone linear between detection faces 120 interior rotating magnetic field phase and the permanent magnet rotatable phase α and the scope in nonlinear zone, to r (0, rotating magnetic field phase when getting different value Ro) and permanent magnet rotatable phase α relation curve carry out match, and calculate magnetic field fluctuation and concern normalized B and permanent magnet rotatable phase α relation curve.
Figure 12 is the linear fit parameters R
2Graph of a relation with r/Ro.From curve 22 as can be seen, in zone 23, its value is close to 1, show that rotating magnetic field phase and permanent magnet rotatable phase α are near linear relationship in this zone, therefore zone 23 is tunnel magnetoresistive angular displacement sensor corresponding particular detection zone in the detection faces 120 of permanent magnet 100, this zone is suitable for placing tunnel magnetoresistive angular displacement sensor 17, then is not suitable for the placement of tunnel magnetoresistive angular displacement sensor 17 in regional 24 scopes.
Figure 13 is in the detection faces 120, the relation curve of normalized B and tunnel magnetoresistive angular displacement sensor 500 relative position r/Ro.From curve 25 as can be seen, the acquisition of signal that is suitable for tunnel magnetoresistive angular displacement sensor 17 in particular detection zone 23 internal magnetic field amplitudes of variation.
Embodiment 4
Embodiment 4 is according to another kind of angle magnetic coder of the present utility model, comprise can pivot as specifically as the permanent magnet of structure as described in the embodiment 2, tunnel magnetoresistive angular displacement sensor and digital processing circuit.Except permanent magnet, embodiment 4 is identical with embodiment 3, repeats no more here.
Figure 14 is the three-dimensional magnetic field polar plot of permanent magnet 300 in detection faces 320, by two-dimensional magnetic field component Bx-y distribution characteristics in the detection plane 310 is calculated, obtain as Figure 15,16, linear relationship curve 26 between rotating magnetic field phase and the permanent magnet rotatable phase α in the detection faces 320 shown in 17, nonlinear relationship curve 27 and between the nonlinear relation curve 28 of linearity.The existence of linear relationship curve 26 shows that there is linear zone between rotating magnetic field phase and the permanent magnet rotatable phase α in permanent magnet 300 in its detection faces, and this permanent magnet can be applied to the angle magnetic coder.
Figure 18 is rotating magnetic field amplitude Bx-y and permanent magnet rotatable phase angle [alpha] graph of a relation, and from curve 29 as can be seen, rotating magnetic field Bx-y is that periodically the fluctuation of M shape concerns with rotatable phase angle α.
Equally, in order to determine the scope of the range of linearity in detection faces 320, the φ-α relation curve of different relative position r/Ro numerical value is carried out match, obtain linear fit parameters R shown in Figure 19
2Curve, by curve 30 as can be seen, the particular detection zone 31 in the detection faces 320 then is not suitable for placing tunnel magnetoresistive angular displacement sensor 500 for being suitable for the perform region of tunnel magnetoresistive angular displacement sensor 500 in zone 32.Further, as seen from Figure 20, Normalized B changes less with tunnel magnetoresistive angular displacement sensor 500 relative position r/Ro relation curves 33 amplitude of variation in particular detection zone 31 with respect to inoperative regional 32.
More than analyze as can be seen, for permanent magnet 100 and permanent magnet 300, in detection plane 120 and 320, exist particular detection zone 23 and 31, make tunnel magnetoresistive angular displacement sensor 500 in this zone, have linear relationship between rotating magnetic field phase and the permanent magnet rotatable phase α, and its magnetic field fluctuating range satisfy the requirement of sensor.Like this, the measured rotating magnetic field angle of tunnel magnetoresistive angular displacement sensor can be changed into the permanent magnet anglec of rotation by transformation, and calculates and be output as the code that characterizes the described permanent magnet anglec of rotation by digital processing circuit, realizes the angular coding of angle magnetic coder.Can be applicable to fields such as electronic water meter according to angle magnetic coder of the present utility model.
Shown in Figure 21 is the electronic water meter structural drawing that the angle magnetic coding unit of permanent magnet 100 or 300 is installed.Describe according to electronic water meter of the present utility model below in conjunction with the permanent magnet of embodiment 1 and the angle magnetic coding unit of embodiment 4.Electronic water meter comprises central rotating shaft, digital counting runner and at least one angle magnetic coding unit.When electronic water meter comprises a plurality of angle magnetic coding unit, has definite revolution relation between the rotating shaft of the angle magnetic coding unit that is arranged in order.
This electronic water meter comprises with digital counting runner 2001 and is embedded in wherein the column circular ring-shaped permanent-magnet body 100 that together rotates with the digital counting runner.Circuit board on digital counting runner opposite is equipped with tunnel magnetoresistive angular displacement sensor 500.Central rotating shaft passes the center of digital counting runner.Column circular ring-shaped permanent-magnet body 100 and digital counting runner 2001 form a magnetic coding unit together with the tunnel magnetoresistive angular displacement sensor 500 that is positioned on the permanent magnet detection faces.Preferably, electronic water meter can include 2 to 10 such coding units.The rotating cycle of digital counting runner becomes the relation of N:1 in the adjacent encoder unit, and N is the integer greater than 1.Digital processing circuit is connected with each tunnel magnetoresistive angular displacement sensor, and the output of described tunnel magnetoresistive angular displacement sensor is converted to digital reading.Preferably, the rotating cycle of digital counting runner becomes the relation of 10:1 in the adjacent encoder unit, even the 1st coding unit rotation 10 in the left side
MCircle, M is the integer greater than 1, will make the counting unit rotation 10 on adjacent the right
M-1Circle, by that analogy.The output terminal of each tunnel magnetoresistive angular displacement sensor is connected with digital processing circuit on the circuit board, and the output terminal of digital processing circuit is connected with the interface of checking meter.The tunnel magnetoresistive angular displacement sensor is made up of two magnetic tunnel-junction bridge sensor.The direction of magnetization of the pinning layer of these two magnetic tunnel-junction bridge sensor is vertical mutually, so just can produce the output that 90 degree phase differential are arranged each other, it is the rotating magnetic field angle phi that the sine and cosine of passing through to produce output just can calculate the magnetic direction that is applied on the tunnel magnetoresistive angular displacement sensor.These two kinds of output functions may be to be provided by two orthogonal single shaft rotation sensors, or a twin shaft rotation sensor provides.The representative model of these rotation sensors has MMA153F and the MMA253F that is produced by Jiangsu multidimensional Science and Technology Ltd., but is not limited to top said two models.
As described in embodiment 1, permanent magnet 100 is the column circular ring structure, comprises permanent magnet unit 101 and permanent magnet unit 102, and with respect to section of diameter 110 how much symmetries, the corresponding magnetization 103 of permanent magnet unit 101 and permanent magnet unit 102 and 104 is along the axis direction antiparallel, and size is identical.
In each angle magnetic coding unit, permanent magnet 100 external diameters are 3-20mm, internal diameter is 1-15mm, highly be 1.5-10mm, permanent magnet 100 is embedded in the digital runner 2001, the numeral runner rotates around central shaft 2003, tunnel magnetoresistive angular displacement sensor 500 be installed in apart from the detection faces 120 of permanent magnet 100 end face 1-5mm apart from the r/Ro particular detection zone, axle center 23, in this particular detection zone, the rotating magnetic field angle phi and the permanent magnet rotatable phase angle α that detect magnetic-field component are linear.Detecting magnetic-field component 121 is the component of magnetic field in detection faces 120.Tunnel magnetoresistive angular displacement sensor 500 is positioned on the circuit board 2002, and its two end signal is by circuit board 2002 outputs.Numeral runner 2001 is installed on the central shaft 2003 and circuit board 2002 is fixed on the water meter frame 2004 together.Owing to detect the rotating magnetic field angle phi of magnetic-field component 121 and the linear relationship between the permanent magnet phase angle [alpha], therefore, rotating magnetic field angle phi and the permanent magnet phase angle [alpha] that measures according to tunnel magnetoresistive angular displacement sensor 500 can be mapped one by one.The measured rotating magnetic field angle of tunnel magnetoresistive angular displacement sensor can be changed into the anglec of rotation of digital counting runner by transformation, and calculates and be output as the code that characterizes the described count numbers runner anglec of rotation by digital processing circuit.
Different digital runners is used for reading different figure places in the digital water meter rotating shaft, is the revolution relation of N:1 between the adjacent digital runner.Preferably, N is 10.The angular displacement of each digital runner is permanent magnet rotatable phase α, can calculate by the measurement that 500 pairs of each tunnel magnetoresistive angular displacement sensors are fixed on the rotating magnetic field of the permanent magnet 100 in the digital runner.In 0 ~ 360 °, be divided into ten five equilibriums by the angle with runner, and characterize with ten numerals respectively, just can set up the angular displacement of runner and the relation between the numeral, and become the digital code form by the digital processing circuit processes and displays on the circuit board 2002.By to the reading of the different corresponding numerals of digital runner, can show by the electron gain meter reading.
The principle of work that the electronic water meter of permanent magnet 300 is installed is similar to the electronic water meter that adopts permanent magnet 100.Permanent magnet 300 is the column circular ring structure, comprises permanent magnet unit 301 and permanent magnet unit 302, and with respect to section of diameter 310 how much symmetries.Permanent magnet unit 301 is identical with permanent magnet unit 302 magnetization sizes, and direction is along parallel perpendicular to section of diameter 310 directions.Permanent magnet 300 external diameters for example are 5-20mm, and internal diameter is 1-5mm, highly are 1-5mm.Tunnel magnetoresistive angular displacement sensor 500 be installed in apart from the detection faces 320 of permanent magnet 300 end face 1-5mm apart from the axle center distance in the particular detection zone 31 of r/Ro, in this particular detection zone, the rotating magnetic field phase and the permanent magnet rotatable phase α that detect magnetic-field component are linear.Detecting magnetic-field component 321 is the component of magnetic field in detection faces 320.Its testing process is similar to the electronic water meter that adopts permanent magnet 100, repeats no more here.
The above is preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.
Claims (14)
1. angle magnetic coder, this angle magnetic coder comprises:
The numeral runner;
With the coaxial hard-wired permanent magnet of described digital runner (100,300),
The tunnel magnetoresistive angular displacement sensor is positioned on the described permanent magnet detection faces and is used for magnetic field that the described permanent magnet of sensing produces at the component of this detection faces and exports sensing signal, and
Digital processing circuit is used for calculating and export the code that characterizes the described digital runner anglec of rotation according to the sensing signal from described tunnel magnetoresistive angular displacement sensor,
It is characterized in that,
This permanent magnet (100,300) has the column circular ring structure, and comprises first permanent magnet unit (101,301) and second permanent magnet unit (102,302), described first permanent magnet unit (101,301) and second permanent magnet unit (102,302) with respect to how much symmetries of section of diameter (110,310)
The magnetization (103,303) of described first permanent magnet unit (101,301) and the magnetization (104,304) of second permanent magnet unit (102,302) are parallel to the axial of column annulus, and direction is opposite, or
The magnetization (103,303) of described first permanent magnet unit (101,301) and the magnetization (104,304) of second permanent magnet unit (102,302) are perpendicular to described section of diameter (110,310), and the parallel unanimity of direction,
Described tunnel magnetoresistive angular displacement sensor is positioned at the detection faces of described permanent magnet apart from the zone of permanent magnet column annulus axle center certain radius scope, in the zone of this certain radius scope, the rotating magnetic field phasing degree (φ) of the component of magnetic field in detection faces that described permanent magnet produces is the linear changing relation with permanent magnet rotatable phase angle (α).
2. angle magnetic coder as claimed in claim 1 is characterized in that, described tunnel magnetoresistive angular displacement sensor comprises the single shaft rotation sensor of two orthogonal settings or the Hui Sitong bridge twin shaft rotation sensor of 90 degree rotations relative to each other.
3. angle magnetic coder according to claim 1 is characterized in that, the corresponding detection faces of described permanent magnet (100,300) (120,320) is positioned at column annulus end face the place ahead and is parallel to end face.
4. angle magnetic coder as claimed in claim 1 is characterized in that, the distance between the column annulus end face of described tunnel magnetoresistive angular displacement sensor place detection faces and described permanent magnet is 1-5mm.
5. angle magnetic coder according to claim 1 is characterized in that, the magnetization (103,303) of described first permanent magnet unit (101,301) is identical with the magnetization (104,304) of second permanent magnet unit (102,302) size.
6. angle magnetic coder according to claim 1 is characterized in that, the external diameter of described permanent magnet (100,300) column circular ring structure is 3-200mm, and internal diameter is 1-100mm, highly is 1-50mm.
7. an electronic water meter comprises a plurality of counting units and digital processing circuit, it is characterized in that,
Described each counting unit comprises:
The digital counting runner that is connected with rotation axis,
With the coaxial hard-wired permanent magnet of described digital counting runner and
The tunnel magnetoresistive angular displacement sensor is positioned on the described permanent magnet detection faces and is used for magnetic field that the described permanent magnet of sensing produces at the component of this detection faces and exports sensing signal,
Digital counting runner rotating cycle ratio in the adjacent counting unit is N:1, and N is the integer greater than 1,
Described digital processing circuit is connected with each tunnel magnetoresistive angular displacement sensor, and the output of described tunnel magnetoresistive angular displacement sensor is converted to digital reading,
This permanent magnet (100,300) has the column circular ring structure, and comprises first permanent magnet unit (101,301) and second permanent magnet unit (102,302), described first permanent magnet unit (101,301) and second permanent magnet unit (102,302) with respect to how much symmetries of section of diameter (110,310)
The magnetization (103,303) of described first permanent magnet unit (101,301) and the magnetization (104,304) of second permanent magnet unit (102,302) are parallel to the axial of column annulus, and direction is opposite, or
The magnetization (103,303) of described first permanent magnet unit (101,301) and the magnetization (104,304) of second permanent magnet unit (102,302) are perpendicular to described section of diameter (110,310), and the parallel unanimity of direction,
Described tunnel magnetoresistive angular displacement sensor is positioned at the detection faces of described permanent magnet apart from the zone of permanent magnet column annulus axle center certain radius scope, in the zone of this certain radius scope, the rotating magnetic field phasing degree (φ) of the component of magnetic field in detection faces that described permanent magnet produces is the linear changing relation with permanent magnet rotatable phase angle (α).
8. electronic water meter as claimed in claim 7 is characterized in that, described tunnel magnetoresistive angular displacement sensor comprises the single shaft rotation sensor of two orthogonal settings or the Hui Sitong bridge twin shaft rotation sensor of 90 degree rotations relative to each other.
9. electronic water meter as claimed in claim 7 is characterized in that, this electronic water meter further comprises the interface of checking meter that is connected with described digital processing circuit.
10. electronic water meter as claimed in claim 7, it is characterized in that the corresponding detection faces (120 of described permanent magnet (100,300), 320) be positioned at column annulus end face the place ahead and be parallel to end face, and the distance between the column annulus end face of described permanent magnet is 1-5mm.
11. electronic water meter as claimed in claim 7 is characterized in that, the magnetization (103,303) of described first permanent magnet unit (101,301) is identical with the magnetization (104,304) of second permanent magnet unit (102,302) size.
12. electronic water meter as claimed in claim 7 is characterized in that, the external diameter of described permanent magnet (100,300) column circular ring structure is 3～20mm, and internal diameter is 1～15mm, highly is 1～10mm.
13. electronic water meter as claimed in claim 7 is characterized in that, this electronic water meter comprises 2-10 counting unit.
14. electronic water meter as claimed in claim 7 is characterized in that, the digital counting runner rotating cycle ratio in the adjacent counting unit is 10:1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320010700 CN203116756U (en) | 2013-01-09 | 2013-01-09 | Angle magnetic encoder and electronic water meter |
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|---|---|---|---|
| CN 201320010700 CN203116756U (en) | 2013-01-09 | 2013-01-09 | Angle magnetic encoder and electronic water meter |
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| CN203116756U true CN203116756U (en) | 2013-08-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2014029369A1 (en) * | 2012-08-24 | 2014-02-27 | 江苏多维科技有限公司 | Direct-reading type metering device and direct-reading type water meter |
| CN103913183A (en) * | 2013-01-09 | 2014-07-09 | 江苏多维科技有限公司 | Magnetic angle encoder and electronic water meter |
| WO2014108096A1 (en) * | 2013-01-11 | 2014-07-17 | 江苏多维科技有限公司 | Multi-turn absolute magnetic encoder |
| CN104568041A (en) * | 2015-01-14 | 2015-04-29 | 江苏多维科技有限公司 | Direct-reading meter capable of eliminating magnetic interference of adjacent rotating wheels |
| CN104596605A (en) * | 2015-02-04 | 2015-05-06 | 江苏多维科技有限公司 | Magnetic automation flow recorder |
| CN110132207A (en) * | 2019-05-24 | 2019-08-16 | 中国林业科学研究院资源信息研究所 | A kind of single wooden diameter measuring method based on angle change |
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2013
- 2013-01-09 CN CN 201320010700 patent/CN203116756U/en not_active Expired - Lifetime
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| WO2014029369A1 (en) * | 2012-08-24 | 2014-02-27 | 江苏多维科技有限公司 | Direct-reading type metering device and direct-reading type water meter |
| US9880023B2 (en) | 2012-08-24 | 2018-01-30 | MultiDimension Technology Co., Ltd. | Direct read metering device and direct read water meter |
| CN103913183A (en) * | 2013-01-09 | 2014-07-09 | 江苏多维科技有限公司 | Magnetic angle encoder and electronic water meter |
| WO2014108075A1 (en) * | 2013-01-09 | 2014-07-17 | 江苏多维科技有限公司 | Magnetic angle encoder and electronic water meter |
| US9638561B2 (en) | 2013-01-09 | 2017-05-02 | MultiDimension Technology Co., Ltd. | Magnetic angle encoder and electronic water meter |
| US9389099B2 (en) | 2013-01-11 | 2016-07-12 | MultiDimension Technology Co., Ltd. | Multi-turn absolute magnetic encoder |
| WO2014108096A1 (en) * | 2013-01-11 | 2014-07-17 | 江苏多维科技有限公司 | Multi-turn absolute magnetic encoder |
| WO2016112829A1 (en) * | 2015-01-14 | 2016-07-21 | 江苏多维科技有限公司 | Direct-reading gauge capable of eliminating magnetic interference of adjacent rotary wheel |
| CN104568041A (en) * | 2015-01-14 | 2015-04-29 | 江苏多维科技有限公司 | Direct-reading meter capable of eliminating magnetic interference of adjacent rotating wheels |
| CN104568041B (en) * | 2015-01-14 | 2018-01-26 | 江苏多维科技有限公司 | A kind of direct-reading gage for eliminating adjacent runner magnetic interference |
| US10794752B2 (en) | 2015-01-14 | 2020-10-06 | MultiDimension Technology Co., Ltd. | Direct-read meter capable of eliminating magnetic interference of adjacent rotating wheels |
| CN104596605A (en) * | 2015-02-04 | 2015-05-06 | 江苏多维科技有限公司 | Magnetic automation flow recorder |
| CN104596605B (en) * | 2015-02-04 | 2019-04-26 | 江苏多维科技有限公司 | A kind of magnetic automation flow recorder |
| CN110132207A (en) * | 2019-05-24 | 2019-08-16 | 中国林业科学研究院资源信息研究所 | A kind of single wooden diameter measuring method based on angle change |
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