WO2014108075A1 - 一种角度磁编码器和电子水表 - Google Patents
一种角度磁编码器和电子水表 Download PDFInfo
- Publication number
- WO2014108075A1 WO2014108075A1 PCT/CN2014/070360 CN2014070360W WO2014108075A1 WO 2014108075 A1 WO2014108075 A1 WO 2014108075A1 CN 2014070360 W CN2014070360 W CN 2014070360W WO 2014108075 A1 WO2014108075 A1 WO 2014108075A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- permanent magnet
- displacement sensor
- magnetic field
- angular displacement
- magnet unit
- Prior art date
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/06—Indicating or recording devices
- G01F15/065—Indicating or recording devices with transmission devices, e.g. mechanical
- G01F15/066—Indicating or recording devices with transmission devices, e.g. mechanical involving magnetic transmission devices
-
- 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
- G01D5/244—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 influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
- G01D5/245—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 influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train
- G01D5/2451—Incremental encoders
Definitions
- the invention relates to a permanent magnet in the field of measurement technology, in particular to a permanent magnet suitable for an angular magnetic encoder, an angular magnetic encoder comprising the permanent magnet and an electronic water meter.
- the photoelectric coding technology can realize direct reading and measurement of the digital counting wheel code, and does not need to be accumulated, thereby being widely used.
- this technology generally has a carry-on error phenomenon, and has poor anti-interference ability to bubbles, glare, dirt, leakage and the like.
- the angular magnetic coding technology has higher resolution, no carry error phenomenon, good stability, and can completely eradicate various kinds of bad faults caused by photoelectric technology, and becomes an alternative coding technique for photoelectric coding.
- the angular magnetic coding technique obtains the measurement reading by encoding the digital counting wheel.
- the principle is to use a magnetoresistive sensor such as a tunnel magnetoresistive angular displacement sensor to sense the rotating magnetic field phase of the annular permanent magnet mounted on the digital counting wheel.
- the angle is used to measure the corner and position of the wheel and is electronically converted into a corresponding digital reading.
- the measurement accuracy of the angular magnetic coding technique depends on the performance characteristics of the two components of the magnetic-sensitive angular displacement sensor and the permanent magnet.
- magnetoresistive sensors such as tunnel magnetoresistive sensors have higher magnetic field sensitivity, and their power consumption and size can be greatly reduced.
- the tunnel magnetoresistive angular displacement sensor comprises two mutually orthogonal tunnel magnetoresistive sensors.
- the two sine and cosine outputs formed by the tunnel magnetoresistive angular displacement sensor and the magnetic field component detected by the permanent magnet that is, the component of the magnetic field generated by the permanent magnet in the detection plane and the phase of the rotating magnetic field formed between the sensitive axis of the tunnel magnetoresistive angular displacement sensor angle ⁇ , also referred to herein as the phase angle of the detected magnetic field, is related as follows:
- the phase angle of the rotating magnetic field can be calculated from the output of the tunnel magnetoresistive angular displacement sensor OUT1 and OUT2. Angle:
- ⁇ ATAN ( OUT2/OUT1 ).
- the rotation phase angle ⁇ of the permanent magnet during the rotation is defined as the position vector point of the permanent magnet in the course of the rotation through the tunnel magnetoresistive angular displacement sensor.
- the phase angle of r and the detected magnetic field component of the permanent magnet cause the tunnel magnetoresistive angular displacement sensor to induce.
- the permanent magnet rotation phase angle ⁇ and the rotating magnetic field phase angle f form a linear relationship, satisfying 0 ⁇ 360
- the phase relationship between the phase angle ⁇ of the rotating magnetic field detected by the tunnel magnetoresistive angular displacement sensor and the rotational phase angle ⁇ of the permanent magnet can be correlated.
- the tunnel magnetoresistive angle magnetic encoder technology has special requirements for the design performance of permanent magnets when applied to electronic water meters, and the permanent magnets used in the existing angle magnetic encoders have the following disadvantages:
- the existing angular magnetic encoder mostly uses a Hall sensor as an angle sensor, and the corresponding detection magnetic field component is a component of a magnetic field generated by a permanent magnet perpendicular to the detection surface, and the detection magnetic field component corresponding to the tunnel magnetoresistive angular displacement sensor is a magnetic field.
- the permanent magnet of the existing angular magnetic encoder cannot satisfy the requirements of the magnetic field measurement of the tunnel magnetoresistive angular displacement sensor.
- the existing angular magnetic encoder permanent magnets generally adopt a solid cylindrical design, and the electronic water meter is to minimize the installation space, and the permanent magnets are required to be circularly arranged to be directly mounted on the runner.
- the object of the present invention is to overcome the above-mentioned shortcomings in the prior art, and to provide a permanent magnet suitable for an angular magnetic encoder, which can be mounted on an electronic water meter runner, save installation space, and can meet the tunnel reluctance angle.
- the phase angle of the rotating magnetic field between the displacement sensor and the magnetic field component in the detection plane The linear relationship between ⁇ and the rotational phase angle ⁇ of the permanent magnet increases the measurement accuracy of the angular magnetic encoder.
- an angular magnetic encoder comprising:
- a tunnel magnetoresistive angular displacement sensor on the permanent magnet detecting surface for sensing a component of a magnetic field generated by the permanent magnet in the detecting surface and outputting a sensing signal
- a digital processing circuit for calculating and outputting a code characterizing a rotation angle of the digital wheel according to a sensing signal from the tunnel magnetoresistive angular displacement sensor
- the permanent magnet has a columnar annular structure and includes a first permanent magnet unit and a second permanent magnet unit, the first permanent magnet unit and the second permanent magnet unit being symmetrical with respect to a diameter cross section, the diameter cross section being a permanent magnet a cross section of the outer diameter and the axial length,
- the magnetization of the first permanent magnet unit and the magnetization of the second permanent magnet unit are parallel to the axial direction of the cylindrical ring and are opposite in direction, or
- the magnetization of the first permanent magnet unit and the magnetization of the second permanent magnet unit are perpendicular to the diameter section, and the directions are parallel and uniform.
- the tunnel magnetoresistive angular displacement sensor is located in a region of the detection surface of the permanent magnet within a specific radius range of the axis of the permanent magnet columnar ring, the size of the region of the specific radius range and the radius of the permanent magnet of the columnar ring structure Depending on the size, in the region of the specific radius, the phase angle of the rotating magnetic field of the component of the magnetic field generated by the permanent magnet in the detecting plane is linearly related to the rotational phase angle of the permanent magnet.
- the tunnel magnetoresistive angular displacement sensor comprises two uniaxial rotation sensors or Wheatstone bridges arranged orthogonally to each other. Rotating two-axis rotation sensor.
- the detecting surface corresponding to the permanent magnet is located in front of the cylindrical annular end surface and parallel to the end surface.
- the distance between the detecting surface of the tunnel magnetoresistive angular displacement sensor and the cylindrical annular end surface of the permanent magnet is 1-5 mm .
- the magnetization of the first permanent magnet unit and the magnetization of the second permanent magnet unit are the same.
- the permanent magnet of the columnar annular structure has an outer diameter of 3-200 mm, an inner diameter of 1-100 mm, and an axial length of 1-50 mm.
- an electronic water meter comprising a plurality of counting units and digital processing circuits,
- Each of the counting units includes:
- a tunnel magnetoresistive angular displacement sensor on the permanent magnet detecting surface for sensing a component of the magnetic field generated by the permanent magnet in the detecting surface and outputting a sensing signal
- the number of revolutions of the number counting wheel in the adjacent counting unit is N:1, and N is an integer greater than 1.
- the digital processing circuit is coupled to each tunnel magnetoresistive angular displacement sensor to convert the output of the tunneled magnetoresistive angular displacement sensor into a digital reading.
- the permanent magnet has a columnar annular structure and includes a first permanent magnet unit and a second permanent magnet unit, the first permanent magnet unit and the second permanent magnet unit being geometrically symmetric with respect to a diameter section, the diameter section being a permanent magnet a cross section of the outer diameter and the axial length,
- the magnetization of the first permanent magnet unit and the magnetization of the second permanent magnet unit are parallel to the axial direction of the cylindrical ring and are opposite in direction, or
- the magnetization of the first permanent magnet unit and the magnetization of the second permanent magnet unit are perpendicular to the diameter section, and the directions are parallel and uniform.
- the tunnel magnetoresistive angular displacement sensor is located in a region of the detection surface of the permanent magnet within a specific radius range of the axis of the permanent magnet columnar ring, the size of the region of the specific radius range and the radius of the permanent magnet of the columnar ring structure Relating to the size, in the region of the specific radius, the phase angle of the rotating magnetic field of the component of the magnetic field generated by the permanent magnet in the detecting plane is linearly related to the rotational phase angle of the permanent magnet .
- the tunnel magnetoresistive angular displacement sensor comprises two uniaxial rotation sensors or Wheatstone bridges arranged orthogonally to each other.
- a two-axis rotation sensor that rotates.
- the electronic water meter further includes a meter reading interface coupled to the digital processing circuit.
- the detecting surface corresponding to the permanent magnet is located in front of the cylindrical annular end surface and parallel to the end surface, and the distance from the cylindrical annular end surface of the permanent magnet is 1-5 mm.
- the magnetization of the first permanent magnet unit and the magnetization of the second permanent magnet unit are the same.
- the permanent magnet of the columnar annular structure has an outer diameter of 3-20 mm and an inner diameter of 1-15 mm, and the axial length is 1-10 mm.
- the electronic water meter comprises 2-10 counting units.
- the digital count wheel rotation turns ratio in the adjacent counting unit is 10:1.
- the columnar circular permanent magnet used in the invention has a simple structure and can be directly embedded in the digital wheel of the water meter to reduce the requirement for the installation space.
- the columnar circular permanent magnet used in the present invention comprises two simple permanent magnet units, and the magnetization configuration is simple and easy to implement.
- the cylindrical annular permanent magnet used in the present invention has a specific detection region having a linear relationship between the rotational phase angle of the detected magnetic field component and the rotational phase angle of the permanent magnet in the detecting surface, and satisfies the measurement requirement of the tunnel magnetoresistive angular displacement sensor.
- the cylindrical annular permanent magnet used in the invention has the distance between the detecting surface and the end surface, and the distance between the specific detecting area and the axis in the detecting surface can be varied within a large range, so that the installation space of the tunnel magnetoresistive angular displacement sensor is flexible. .
- the magnetic encoder and the electronic water meter according to the present invention have a small volume and high measurement accuracy.
- Figure 1 is a top plan view of a permanent magnet according to Embodiment 1 of the present invention.
- Figure 2 is a front view of the permanent magnet shown in Figure 1.
- Figure 3 is a top plan view of a permanent magnet according to Embodiment 2 of the present invention.
- Figure 4 is a front view of the permanent magnet shown in Figure 3.
- Figure 5 is a top plan view of the mounting position of the permanent magnet relative to the tunnel magnetoresistive angular displacement sensor in accordance with the present invention.
- Figure 6 is a side elevational view of the mounting position of the permanent magnet relative to the tunnel magnetoresistive angular displacement sensor in accordance with the present invention.
- Fig. 7 is a three-dimensional magnetic field vector distribution diagram of the permanent magnet of the first embodiment in the detection plane.
- Fig. 8 is a view showing a phase angle of a rotating magnetic field ⁇ and a rotational phase angle of a permanent magnet for detecting a magnetic field component in the permanent magnet detecting surface of the first embodiment Typical linear relationship diagram.
- Fig. 9 is a view showing the phase angle of the rotating magnetic field ⁇ and the rotational phase angle of the permanent magnet of the magnetic field component detected by the permanent magnet in the embodiment 1.
- Figure 10 is a diagram showing the phase angle of the rotating magnetic field ⁇ and the rotational phase angle of the permanent magnet for detecting the magnetic field component in the permanent magnet detecting surface of the first embodiment. A graph of the relationship between linear and nonlinear.
- Figure 11 shows the magnetic field amplitude of the magnetic field component Bx-y and the rotational phase angle of the permanent magnet in the permanent magnet detection plane of the first embodiment. relation chart.
- a linear fitting parameter R 2 for detecting a relationship between a rotating magnetic field phase angle ⁇ of a magnetic field component and a rotational phase angle ⁇ of a permanent magnet in the permanent magnet detecting surface of Embodiment 1, and a relative position of the tunneling magnetoresistive angular displacement sensor from the axial center. /Ro diagram.
- Figure 13 is the embodiment 1 In the permanent magnet detection plane, the relationship between the regular magnetic field amplitude of the detected magnetic field component and the relative position of the tunnel magnetoresistive angular displacement sensor from the axis is r/Ro.
- Fig. 14 is a three-dimensional magnetic field vector distribution diagram of the permanent magnet of the second embodiment in the detection plane.
- Figure 15 is a diagram showing the phase angle of the rotating magnetic field ⁇ and the rotational phase angle of the permanent magnet for detecting the magnetic field component in the permanent magnet detecting surface of the second embodiment. Typical linear relationship diagram.
- Figure 16 is a diagram showing the phase angle of the rotating magnetic field ⁇ and the rotational phase angle of the permanent magnet for detecting the magnetic field component in the permanent magnet detecting surface of the embodiment 2. Nonlinear relationship diagram.
- Figure 17 is a diagram showing the phase angle of the rotating magnetic field ⁇ and the rotational phase angle of the permanent magnet of the rotating magnetic field component of the permanent magnet detected in Example 2. A graph of the relationship between linear and nonlinear.
- Figure 18 is a diagram showing the magnetic field amplitude of the magnetic field component detected by the permanent magnet in the second embodiment. Bx-y and the rotational phase angle of the permanent magnet ⁇ relation chart.
- Figure 20 is the embodiment 2 In the permanent magnet detection plane, the relationship between the regular magnetic field amplitude of the detected magnetic field component and the relative position of the tunnel magnetoresistive angular displacement sensor from the axis is r/Ro.
- Figure 21 is a schematic diagram of the structure of an electronic water meter.
- FIG. 1 and 2 schematically show schematic views of a permanent magnet 100 according to Embodiment 1 of the present invention.
- Permanent magnet 100 The cylindrical ring geometry includes a permanent magnet unit 101 and a permanent magnet unit 102, and the permanent magnet unit 101 and the permanent magnet unit 102 are geometrically symmetric with a diameter section 110.
- Permanent magnet unit 101 The magnetization 103 and the magnetization 104 of the permanent magnet unit 102 are anti-parallel in the direction of the axis.
- the magnetization 103 of the permanent magnet 101 and the magnetization of the permanent magnet unit 102 104 is the same size.
- the size of the permanent magnet 100 can design the size of the permanent magnet 100 as needed.
- the inner diameter of the cylindrical ring of the permanent magnet 100 is 1-100mm
- the outer diameter of the cylindrical ring is 3-200 mm
- the axial length of the cylindrical ring is 1-50 mm.
- the detecting surface 120 corresponding to the permanent magnet 100 is located in front of the cylindrical annular end surface and parallel to the end surface. Preferably, the detecting surface 120 The distance from the end face of the cylindrical ring is 1-5 mm.
- the detected magnetic field component 121 corresponding to the permanent magnet 100 is a component of the magnetic field generated by the permanent magnet in the detecting surface 120.
- the detection surface The specific detection area 122 corresponding to 120 is located in a region of a specific radius from the axis of the cylindrical ring, in which the rotational phase angle of the magnetic field component 121 and the permanent magnet 100 are detected.
- the rotational phase angle has a linear variation characteristic, which will be described in detail below.
- the constituent material of the permanent magnet 100 is Alnico.
- the constituent material of the permanent magnet 100 is a ferrite ceramic material MO ⁇ 6Fe 2 O 3 , M is Ba, Sr or a combination of both.
- the constituent material of the permanent magnet 100 is a FeCrCo alloy or an NbFeB alloy.
- the permanent magnet 100 is a composite of a powder of the above permanent magnet material and a plastic, rubber or resin.
- Permanent magnet 300 It is a cylindrical ring geometry comprising a permanent magnet unit 301 and a permanent magnet unit 302, and the permanent magnet unit 301 and the permanent magnet unit 302 are geometrically symmetric with a diameter section 310.
- Permanent magnet unit 301 The magnetization 303 and the magnetization 304 of the permanent magnet unit 302 are parallel in a direction perpendicular to the diameter cross section.
- the magnetization 303 and the permanent magnet unit 302 of the permanent magnet unit 301 The magnetization 304 is the same size.
- the size of the permanent magnet 300 can design the size of the permanent magnet 300 as needed.
- the inner diameter of the cylindrical ring of the permanent magnet 300 is 1-100mm
- the outer diameter of the cylindrical ring is 3-200 mm
- the axial length of the cylindrical ring is 1-50 mm.
- the detecting surface 320 corresponding to the permanent magnet 300 is located in front of the end surface of the cylindrical ring and is parallel to the end surface. Preferably, the detecting surface 320 The distance from the end face of the cylindrical ring is 1-5 mm.
- the detected magnetic field component 321 corresponding to the permanent magnet 300 is a component of the magnetic field generated by the permanent magnet in the detecting surface 320.
- the detection surface A specific detection area 322 corresponding to 320 is located in a region from a specific radius of the axis of the cylindrical ring in which the rotational phase angle of the magnetic field component 321 and the permanent magnet 300 are detected.
- the rotational phase angle has a linear variation characteristic, which will be described in detail below.
- the constituent material of the permanent magnet 300 is Alnico.
- the constituent material of the permanent magnet 300 is a ferrite ceramic material MO ⁇ 6Fe 2 O 3 , M is Ba, Sr or a combination of both.
- the constituent material of the permanent magnet 300 is a FeCrCo alloy or an NbFeB alloy.
- the permanent magnet 300 is a composite of a powder of the above permanent magnet material and a plastic, rubber or resin.
- Embodiment 3 is an angle magnetic encoder according to the present invention, including A digital wheel that can be rotated around the axis, a permanent magnet embedded in the digital wheel, a tunnel magnetoresistive angular displacement sensor and a digital processing circuit.
- the permanent magnet is a permanent magnet according to the invention.
- the tunnel magnetoresistive angular displacement sensor is located on the permanent magnet detecting surface for sensing a component of the magnetic field generated by the permanent magnet in the detecting surface and outputting a sensing signal.
- the tunnel magnetoresistive angular displacement sensor is disposed in a region of the detection surface of the permanent magnet within a specific radius range of the axis of the permanent magnet columnar ring, and the magnetic field generated by the permanent magnet is in the detection plane in the region of the specific radius Phase angle of the rotating magnetic field ⁇ has a linear relationship with the rotational phase angle ⁇ of the permanent magnet.
- a digital processing circuit is operative to calculate and output a code characterizing the angle of rotation of the permanent magnet based on a sensed signal from the tunneled magnetoresistive angular displacement sensor.
- Figures 5 and 6 are the permanent magnets 100, 300 and the tunnel magnetoresistive angular displacement sensor 500 in the embodiment 3, respectively.
- X-Y is established in the detecting faces 120, 320 with the permanent magnet axis as the origin
- the coordinate system is shown in Figure 5. It is assumed that the inner radius of the cylindrical ring of the permanent magnets 100, 300 is Ri, the outer radius is Ro, the thickness is t, and the tunnel magnetoresistive angular displacement sensor 500 is on the detecting surface.
- the position vector in 120, 320 is r(x, y) whose azimuth is ⁇ with respect to the X axis. Assume that the detected magnetic field component at r is Bx-y(Bx , By) ⁇ .
- the relationship between angle ⁇ and angle ⁇ is as follows:
- ⁇ and ⁇ vary between (-180 0 , 180 0 ).
- the tunnel magnetoresistive angular displacement sensor 500 When the angular magnetic encoder is operated, the tunnel magnetoresistive angular displacement sensor 500 remains fixed while the permanent magnets 100, 300 Rotating around the axis, the point in the detection plane is centered on the origin, and the point on the circle where r is the radius passes through the tunnel magnetoresistive angular displacement sensor 500 in sequence, and generates a rotating magnetic field whose phase angle and amplitude are the tunnel magnetoresistive angular displacement sensor. 500 measurements. This is equivalent to the permanent magnets 100, 300 remaining fixed, tunnel magnetoresistive angular displacement sensor 500 Shift to different points on the circumference and measure the detected magnetic field. At this time, the rotation phase angle of the permanent magnet is ⁇ , and the phase angle of the rotating magnetic field is ⁇ .
- FIG. 7 is a three-dimensional magnetic field vector diagram of the permanent magnet 100 on the detecting plane 120.
- the relationship between the phase angle ⁇ and the rotational phase angle ⁇ of the permanent magnet may be a linear relationship, a nonlinear relationship or a relationship characteristic between linear and nonlinear.
- the curve 18 shown in Fig. 8 is a typical linear relationship between the rotating magnetic field phase angle ⁇ and the permanent magnet rotating phase angle ⁇ .
- the curve 19 shown in Fig. 9 is the rotating magnetic field phase angle ⁇ and the permanent magnet rotating phase angle ⁇ .
- the typical nonlinear relationship that may occur between the curves 20 shown in Figure 10 is a linear and nonlinear relationship between the phase angle ⁇ of the rotating magnetic field and the rotational phase angle ⁇ of the permanent magnet.
- Figure 11 is a plot of the relationship between the amplitude of the rotating magnetic field Bx-y and the angle of rotation ⁇ , curve 21. As seen from curve 21, the magnitude of the rotating magnetic field is a periodic W-shaped change, and its corresponding maximum and minimum values are B H , B L .
- the fluctuation of the magnetic field amplitude of the permanent magnet during rotation is as small as possible to ensure that the sensor signal is not affected.
- a linear function is used to fit the relationship between ⁇ and ⁇ as shown in Figures 8, 9, and 10, and the linear fitting parameter R 2 is calculated. The closer R 2 is to 1, the better the linearity.
- the degree of magnetic field fluctuations shown by curve 21 can be characterized by the following relationship:
- Figure 12 is a plot of the linear fit parameters R 2 and r/Ro. As can be seen from the curve 22, in the region 23, its value is close to 1, indicating that the rotating magnetic field phase angle ⁇ and the permanent magnet rotating phase angle ⁇ are close to a linear relationship in this region, so the region 23 is the tunnel magnetoresistive angular displacement sensor.
- the specific detection area corresponding to the detection surface 120 of the permanent magnet 100 is suitable for placing the tunnel magnetoresistive angular displacement sensor 17 and is not suitable for the placement of the tunnel magnetoresistive angular displacement sensor 17 in the region 24.
- Figure 13 shows the relative position of the normalized B and the tunnel magnetoresistive angular displacement sensor 500 in the detection surface 120.
- the amplitude of the magnetic field variation in the specific detection region 23 is suitable for the signal detection of the tunnel magnetoresistive angular displacement sensor 17.
- Embodiment 4 is another angle magnetic encoder according to the present invention, which is rotatable about an axis as embodied in Embodiment 2
- the permanent magnet of the structure, the tunnel magnetoresistive angular displacement sensor and the digital processing circuit are also included in the embodiment 4 .
- the embodiment 4 is the same as the embodiment 3, and details are not described herein again.
- Figure 14 is a vector diagram of the three-dimensional magnetic field of the permanent magnet 300 in the detection surface 320, through the detection plane 310
- the internal two-dimensional magnetic field component Bx-y distribution characteristics are calculated, and the phase angle ⁇ of the rotating magnetic field and the rotational phase angle of the permanent magnet in the detecting surface 320 as shown in Figs. 15, 16, 17 are obtained.
- the presence of a linear relationship curve 26 indicates a permanent magnet 300
- there is a region in which the phase angle ⁇ of the rotating magnetic field and the rotational phase angle ⁇ of the permanent magnet are linear, and the permanent magnet can be applied to the angular magnetic encoder.
- Figure 18 is a plot of the relationship between the amplitude of the rotating magnetic field Bx-y and the rotational phase angle of the permanent magnet. From the curve 29, the rotating magnetic field Bx-y follows the rotational phase angle ⁇ as a periodic M-shaped wave relationship.
- the ⁇ - ⁇ relationship curves of the different relative position r/Ro values are fitted, and the linear fitting parameter R 2 curve shown in Fig. 19 is obtained, which can be obtained by the curve 30.
- the specific detection area 31 in the detection surface 320 is suitable for the working area of the tunnel magnetoresistive angular displacement sensor 500, while in the area 32 it is not suitable for placing the tunnel magnetoresistive angular displacement sensor 500.
- the variation amplitude of the normalized B with the tunnel magnetoresistive angular displacement sensor 500 relative position r/Ro relationship 33 in the specific detection region 31 is small with respect to the non-working region 32.
- the detection planes 120 and 320 are Inside, there are specific detection areas 23 and 31 such that the tunneling magnetoresistive angular displacement sensor 500 has a rotating magnetic field phase angle ⁇ and a permanent magnet rotating phase angle in this region. There is a linear relationship between them, and the amplitude of the magnetic field fluctuations satisfies the requirements of the sensor. In this way, the angle of the rotating magnetic field measured by the tunnel magnetoresistive angular displacement sensor can be changed into the rotation angle of the permanent magnet, and The digital processing circuit calculates and outputs a code that characterizes the rotation angle of the permanent magnet, and realizes angular encoding of the angular magnetic encoder.
- the angular magnetic encoder according to the present invention can be applied to fields such as electronic water meters.
- Figure 21 shows the structure of an electronic water meter with an angular magnetic coding unit with permanent magnets 100 or 300 installed.
- the angular magnetic coding unit describes an electronic water meter according to the present invention.
- the electronic water meter includes a central rotating shaft, a digital counting wheel and at least one angular magnetic encoding unit.
- the rotational axes of the angular magnetic coding units arranged in sequence have a determined number of revolutions.
- the electronic water meter includes a cylindrical ring permanent magnet 100 in which the digital counting wheel 2001 is mounted and rotated together with the digital counting wheel.
- a tunnel magnetoresistive angular displacement sensor 500 is mounted on the circuit board opposite the digital counting wheel.
- the center shaft passes through the center of the digital counting wheel.
- the cylindrical ring permanent magnet 100 and the digital counting wheel 2001 together with the tunnel magnetoresistive angular displacement sensor 500 on the permanent magnet detecting surface form a magnetic encoding unit.
- the electronic water meter may contain from 2 to 10 such coding units.
- the number of revolutions of the digital counting wheel in the adjacent coding unit is N:1, and N is an integer greater than 1.
- a digital processing circuit is coupled to each tunnel magnetoresistive angular displacement sensor to convert the output of the tunneled magnetoresistive angular displacement sensor to a digital reading.
- the number of rotations of the digital counting wheel in the adjacent coding unit is 10:1, that is, if the first coding unit on the left rotates 10 M times, M is an integer greater than 1, and the adjacent right side is made.
- the counting unit rotates 10 M -1 turn, and so on.
- the output of each tunnel magnetoresistive angular displacement sensor is connected to a digital processing circuit on the circuit board, and the output of the digital processing circuit is connected to the meter reading interface.
- the tunnel magnetoresistive angular displacement sensor consists of two magnetic tunnel junction bridge sensors.
- the magnetization directions of the pinning layers of the two magnetic tunnel junction bridge sensors are perpendicular to each other, so that an output having a phase difference of 90 degrees from each other can be generated, and the angular displacement of the tunnel can be calculated by the generated sine and cosine output.
- the direction of the magnetic field on the sensor is the phase angle ⁇ of the rotating magnetic field.
- the permanent magnet 100 is a columnar ring structure including a permanent magnet unit 101 and a permanent magnet unit 102. And geometrically symmetric with respect to the diameter section 110, the corresponding magnetizations 103 and 104 of the permanent magnet unit 101 and the permanent magnet unit 102 are anti-parallel in the axial direction and are the same size.
- the permanent magnet 100 has an outer diameter of 3-20 mm and an inner diameter of 1 -15 mm.
- the axial length is 1.5-10 mm
- the permanent magnet 100 is mounted in the digital wheel 2001, and the digital wheel rotates around the central axis 2003.
- the tunnel magnetoresistive angular displacement sensor 500 The distance centered in the detection surface 120 of 1-5 mm from the end face of the permanent magnet 100 r/Ro Specific detection area 23 Within this particular detection region, the phase angle ⁇ of the rotating magnetic field that detects the magnetic field component is linear with the rotational phase angle ⁇ of the permanent magnet. Detecting the magnetic field component 121 as a magnetic field on the detection surface 120 The component inside.
- the tunnel magnetoresistive angular displacement sensor 500 is located on the circuit board 2002, and signals at both ends thereof are output through the circuit board 2002.
- Digital wheel 2001 installed on the central axis 2003 On, it is fixed on the water meter rack 2004 together with the board 2002. Due to the detected magnetic field component 121, the rotating magnetic field phase angle ⁇ and the permanent magnet phase angle ⁇ The linear relationship between them, therefore, the phase angle ⁇ of the rotating magnetic field and the phase angle of the permanent magnet measured by the tunnel magnetoresistive angular displacement sensor 500 can be obtained.
- the angle of the rotating magnetic field measured by the tunnel magnetoresistive angular displacement sensor can be changed into the rotation angle of the digital counting wheel, and The digital processing circuit calculates and outputs a code that characterizes the angle of rotation of the counting digital wheel.
- Different digital reels on the digital water meter shaft are used to read different digits, and the number of revolutions of N:1 between adjacent digital reels.
- N Is 10 .
- the angular displacement of each digital wheel is the rotation phase angle ⁇ of the permanent magnet, and the permanent magnet 100 fixed in the digital wheel can be passed through each tunnel magnetoresistive angular displacement sensor 500. The measurement of the rotating magnetic field is calculated.
- the digital processing circuit processing on 2002 is shown in digital code form.
- the electronic water meter reading display can be obtained by reading the numbers corresponding to different digital wheels.
- Permanent magnet 300 It is a cylindrical ring structure comprising a permanent magnet unit 301 and a permanent magnet unit 302, and is geometrically symmetrical with respect to the diameter section 310. Permanent magnet unit 301 and permanent magnet unit 302 The magnetizations are of the same magnitude and the directions are parallel to the direction perpendicular to the diameter section 310.
- the permanent magnet 300 has an outer diameter of, for example, 5-20 mm, an inner diameter of 1-5 mm, and an axial length of 1-5 mm. .
- the tunnel magnetoresistive angular displacement sensor 500 is mounted on a detection surface 320 which is 1-5 mm from the end face of the permanent magnet 300 and has a distance from the axis center of r/Ro.
- the phase angle ⁇ of the rotating magnetic field for detecting the magnetic field component is linear with the rotational phase ⁇ of the permanent magnet.
- Detecting the magnetic field component 321 is the magnetic field on the detection surface 320 The component inside. The detection process is similar to the electronic water meter using the permanent magnet 100, and will not be described here.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Measuring Volume Flow (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Description
Claims (14)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/760,094 US9638561B2 (en) | 2013-01-09 | 2014-01-09 | Magnetic angle encoder and electronic water meter |
EP14738320.2A EP2944917A4 (en) | 2013-01-09 | 2014-01-09 | MAGNETIC ANGLE CODIER AND ELECTRONIC WATER METER |
JP2015551974A JP6412014B2 (ja) | 2013-01-09 | 2014-01-09 | 磁気角エンコーダおよび電子水道メータ |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201310007695.1 | 2013-01-09 | ||
CN201310007695.1A CN103913183A (zh) | 2013-01-09 | 2013-01-09 | 一种角度磁编码器和电子水表 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014108075A1 true WO2014108075A1 (zh) | 2014-07-17 |
Family
ID=51039046
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CN2014/070360 WO2014108075A1 (zh) | 2013-01-09 | 2014-01-09 | 一种角度磁编码器和电子水表 |
Country Status (5)
Country | Link |
---|---|
US (1) | US9638561B2 (zh) |
EP (1) | EP2944917A4 (zh) |
JP (1) | JP6412014B2 (zh) |
CN (1) | CN103913183A (zh) |
WO (1) | WO2014108075A1 (zh) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9638561B2 (en) | 2013-01-09 | 2017-05-02 | MultiDimension Technology Co., Ltd. | Magnetic angle encoder and electronic water meter |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105737907A (zh) * | 2014-12-30 | 2016-07-06 | 林肯工业公司 | 用于润滑***的流量测量装置 |
CN104596605B (zh) * | 2015-02-04 | 2019-04-26 | 江苏多维科技有限公司 | 一种磁自动化流量记录器 |
CN105490596B (zh) * | 2016-02-01 | 2017-12-08 | 重庆理工大学 | 一种永磁交流伺服电机的嵌入式位置检测*** |
CN105890701A (zh) * | 2016-06-13 | 2016-08-24 | 深圳市捷先数码科技股份有限公司 | 一种计量流体流量的固态计数器 |
CN107314782A (zh) * | 2017-05-18 | 2017-11-03 | 重庆神缘智能科技有限公司 | 一种霍尔计数装置 |
CN107655399A (zh) * | 2017-07-12 | 2018-02-02 | 北京军立方机器人科技有限公司 | 一种多圈绝对值编码器及位置检测方法 |
SE542950C2 (en) * | 2018-02-01 | 2020-09-22 | Leine & Linde Ab | Methods, computer programs, devices and encoders for signal error correction |
CN110120724B (zh) * | 2019-05-31 | 2024-04-26 | 宁波拓普集团股份有限公司 | 一种电机转子角度测量装置及方法 |
CN111928915B (zh) * | 2020-07-20 | 2022-05-03 | 安徽翼迈科技股份有限公司 | 一种无源光电直读机电分离表模块直读方法 |
CN112129211A (zh) * | 2020-09-10 | 2020-12-25 | 宁波金兴量具有限公司 | 一种基于变化磁场的抗干扰测距方法 |
CN113379025A (zh) * | 2021-07-09 | 2021-09-10 | 西安旌旗电子股份有限公司 | 一种基于光电传感器模拟视觉的智能水表及计数方法 |
CN114608629A (zh) * | 2021-11-02 | 2022-06-10 | 杭州微光技术有限公司 | 一种基于amr技术的增量式编码器 |
CN115325929A (zh) * | 2022-07-20 | 2022-11-11 | 山东大学 | 基于磁场变化检测扣件松动的装置、方法和机器人 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2186396Y (zh) * | 1993-12-30 | 1994-12-28 | 北京市公用事业科学研究所 | 远传与直读式气体涡轮流量计 |
CN201748928U (zh) * | 2010-09-07 | 2011-02-16 | 王建国 | 隧道磁电阻效应磁性编码器 |
CN102564498A (zh) * | 2012-01-04 | 2012-07-11 | 合肥精大仪表股份有限公司 | 一种微型涡轮流量计 |
CN102564468A (zh) * | 2010-12-15 | 2012-07-11 | Nxp股份有限公司 | 磁场传感器 |
CN202648615U (zh) * | 2012-03-05 | 2013-01-02 | 旭化成微电子株式会社 | 磁编码器 |
CN202974369U (zh) * | 2012-08-24 | 2013-06-05 | 江苏多维科技有限公司 | 直读式计量装置和直读式水表 |
CN203116756U (zh) * | 2013-01-09 | 2013-08-07 | 江苏多维科技有限公司 | 一种角度磁编码器和电子水表 |
CN203300354U (zh) * | 2013-01-05 | 2013-11-20 | 江苏多维科技有限公司 | 一种适用于角度磁编码器的永磁体 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100206672B1 (ko) * | 1991-01-04 | 1999-07-01 | 피터 존 하이드 | 원격 판독형 데이타 저장소자 및 저장장치 |
JP2000308326A (ja) * | 1999-04-15 | 2000-11-02 | Japan Science & Technology Corp | 発電装置およびそれを使用した生体用電子機器 |
JP4132835B2 (ja) * | 2002-01-23 | 2008-08-13 | 株式会社デンソー | 回転数検出装置 |
ATE402396T1 (de) * | 2002-10-10 | 2008-08-15 | Ebm Papst St Georgen Gmbh & Co | Vorrichtung zum erfassen des absolutwinkels einer welle |
US7400265B2 (en) * | 2005-03-24 | 2008-07-15 | Innovative Technology Concepts | Remotely readable gas meter and method of using the same |
US7714570B2 (en) * | 2006-06-21 | 2010-05-11 | Allegro Microsystems, Inc. | Methods and apparatus for an analog rotational sensor having magnetic sensor elements |
DE102007013755B4 (de) * | 2007-03-22 | 2020-10-29 | Te Connectivity Germany Gmbh | Indikatorelement für einen magnetischen Drehwinkelgeber |
JP2010145371A (ja) * | 2008-12-22 | 2010-07-01 | Aisin Seiki Co Ltd | 角度検出装置 |
JP5231365B2 (ja) * | 2009-09-08 | 2013-07-10 | Ntn株式会社 | 回転角度検出センサ |
DE102009029431A1 (de) * | 2009-09-14 | 2011-03-24 | Dr. Johannes Heidenhain Gmbh | Multiturn-Drehgeber |
JP5079846B2 (ja) * | 2010-06-03 | 2012-11-21 | 東京コスモス電機株式会社 | 位置検出装置 |
FR2965347B1 (fr) * | 2010-09-29 | 2015-04-03 | Moving Magnet Tech | Capteur de position ameliore |
CN202119391U (zh) * | 2011-03-03 | 2012-01-18 | 江苏多维科技有限公司 | 一种独立封装的磁电阻角度传感器 |
CN103915233B (zh) * | 2013-01-05 | 2017-02-08 | 江苏多维科技有限公司 | 一种适用于角度磁编码器的永磁体 |
CN103913183A (zh) | 2013-01-09 | 2014-07-09 | 江苏多维科技有限公司 | 一种角度磁编码器和电子水表 |
-
2013
- 2013-01-09 CN CN201310007695.1A patent/CN103913183A/zh active Pending
-
2014
- 2014-01-09 EP EP14738320.2A patent/EP2944917A4/en not_active Withdrawn
- 2014-01-09 US US14/760,094 patent/US9638561B2/en active Active
- 2014-01-09 JP JP2015551974A patent/JP6412014B2/ja active Active
- 2014-01-09 WO PCT/CN2014/070360 patent/WO2014108075A1/zh active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN2186396Y (zh) * | 1993-12-30 | 1994-12-28 | 北京市公用事业科学研究所 | 远传与直读式气体涡轮流量计 |
CN201748928U (zh) * | 2010-09-07 | 2011-02-16 | 王建国 | 隧道磁电阻效应磁性编码器 |
CN102564468A (zh) * | 2010-12-15 | 2012-07-11 | Nxp股份有限公司 | 磁场传感器 |
CN102564498A (zh) * | 2012-01-04 | 2012-07-11 | 合肥精大仪表股份有限公司 | 一种微型涡轮流量计 |
CN202648615U (zh) * | 2012-03-05 | 2013-01-02 | 旭化成微电子株式会社 | 磁编码器 |
CN202974369U (zh) * | 2012-08-24 | 2013-06-05 | 江苏多维科技有限公司 | 直读式计量装置和直读式水表 |
CN203300354U (zh) * | 2013-01-05 | 2013-11-20 | 江苏多维科技有限公司 | 一种适用于角度磁编码器的永磁体 |
CN203116756U (zh) * | 2013-01-09 | 2013-08-07 | 江苏多维科技有限公司 | 一种角度磁编码器和电子水表 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9638561B2 (en) | 2013-01-09 | 2017-05-02 | MultiDimension Technology Co., Ltd. | Magnetic angle encoder and electronic water meter |
Also Published As
Publication number | Publication date |
---|---|
US20150355010A1 (en) | 2015-12-10 |
US9638561B2 (en) | 2017-05-02 |
JP6412014B2 (ja) | 2018-10-24 |
JP2016503173A (ja) | 2016-02-01 |
EP2944917A4 (en) | 2016-08-31 |
CN103913183A (zh) | 2014-07-09 |
EP2944917A1 (en) | 2015-11-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2014108075A1 (zh) | 一种角度磁编码器和电子水表 | |
WO2014108096A1 (zh) | 一种多圈绝对磁编码器 | |
WO2014106471A1 (zh) | 一种适用于角度磁编码器的永磁体 | |
WO2015043506A1 (zh) | 多圈滑轮式液位传感器装置 | |
JP7246400B2 (ja) | 磁場角度センサに関する角度誤差を低減するためのシステム及び方法 | |
WO2014117734A9 (zh) | 绝对式磁旋转编码器 | |
US9285438B2 (en) | Circuits and methods for processing signals generated by a plurality of magnetic field sensing elements | |
US7598736B2 (en) | Integrated circuit including magneto-resistive structures | |
US11327127B2 (en) | Magnetic field sensor with reduced influence of external stray magnetic fields | |
WO2016026419A1 (zh) | 一种单芯片偏轴磁电阻z-x角度传感器和测量仪 | |
JP2016223894A (ja) | 磁気センサ | |
US8261458B2 (en) | Geomagnetic sensor device and digital compass with the same | |
JP2012127736A (ja) | 磁気センサ | |
US20130200885A1 (en) | Rotation-angle detection device | |
JP2013002835A (ja) | 回転角度検出装置 | |
WO2006035350A1 (en) | Sensor | |
US20230105657A1 (en) | A position sensor system, optical lens system and display | |
JP2009204331A (ja) | 位置検出磁気センサ | |
JP7316494B2 (ja) | 磁気式位置検出装置 | |
CN110567353B (zh) | 磁性编码器 | |
KR20220027050A (ko) | 낮은 각도 오차로 고자기장을 감지하기 위한 자기 각도 센서 장치 | |
JP2021076503A (ja) | 磁気式回転位置検出装置 | |
CN111693909A (zh) | 用于确定旋转构件的至少一个旋转参数的*** | |
Ma et al. | Subdivision circuit design for nanometer grating based second order moire fringe | |
JP2017194457A (ja) | 周期磁界検出するセンサ |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 14738320 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2015551974 Country of ref document: JP Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14760094 Country of ref document: US |
|
REEP | Request for entry into the european phase |
Ref document number: 2014738320 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2014738320 Country of ref document: EP |