CN205037862U - Angle sensor - Google Patents
Angle sensor Download PDFInfo
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- CN205037862U CN205037862U CN201520265592.XU CN201520265592U CN205037862U CN 205037862 U CN205037862 U CN 205037862U CN 201520265592 U CN201520265592 U CN 201520265592U CN 205037862 U CN205037862 U CN 205037862U
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- turning axle
- circuit board
- angular transducer
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- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The utility model relates to an angle sensor includes circuit board, metal block and rotation axis in proper order, is equipped with first coil on the circuit board, and first coil sets up with the metal block relatively, and the rotation that the rotation axis was followed near a side surface of first coil for the distance of first coil to the metal block increases progressively or decreases progressively, and one side fixed connection of first coil is kept away from to the one end and the metal block of rotation axis. The utility model discloses the thickness taper who utilizes the metal block increases progressively, comes the distance of the coil on realization and the circuit board to change, produces the exchangeable effect of different intensity, and inductance type sensing chip detects out the impedance and inductance change of coil, and mechanical structure is simple, and it is very convenient to examine and repair.
Description
Technical field
The utility model relates to a kind of sensor, particularly relates to a kind of angular transducer.
Background technology
Existing angular transducer, as the potentiometer of contact, to slide change in voltage in the circuit that causes by detecting the potentiometer be connected in rotating shaft, calculating the corresponding motion conditions of rotating shaft.Its principle is simple, but potentiometer is through long sliding friction, and after resistive element is worn, precision can decline, even complete failure, thus can cause to lose control of one's vehicle.
In addition also have a kind of situation to be exactly magnetic position sensor, utilize the rotation of permanent magnet to produce rotating magnetic field, then detected the direction in magnetic field by magnetic potential sensing chip, thus detect the anglec of rotation.But such structure also exists a problem, and magnetic potential sensing chip cannot work in high-intensity magnetic field, is particularly arranged near motor, be subject to the high-intensity magnetic field interference of motor and cannot normally work.
Utility model content
In order to solve the problem, the utility model provides a kind of angular transducer to solve the problems referred to above.
The utility model solves the technical scheme that its technical matters adopts: a kind of angular transducer, comprise circuit board, derby and turning axle successively, described circuit board is provided with the first coil, the first described coil and derby are oppositely arranged, described derby near a side surface of the first coil relative to the distance of the first coil with the rotation increasing or decreasing of turning axle, one end of described turning axle is fixedly connected with the side of derby away from the first coil.
Described derby is arc, and on the same axis, the thickness of described derby is cumulative to the other end by one end for the center of circle of derby and the axle center of turning axle.
Described circuit board is also provided with the first inductive sensing chip and control chip, the first described coil is electrically connected successively with the first inductive sensing chip and control chip.
Embodiment 1: described circuit board is separately provided with the second coil and the second inductive sensing chip, the second described coil is also electrically connected with control chip with the second inductive sensing chip.
Embodiment 2: described circuit board is provided with temperature sensor.
Also base plate is provided with between described turning axle and derby, also be provided with annular between described circuit board and base plate successively and support sheet and collar thrust bearing, the inner circle radius that described annular supports sheet and collar thrust bearing is greater than the radius of derby, described derby is positioned at the inner circle that annular supports sheet and collar thrust bearing, and it is that non-metal ring supports sheet that described annular supports sheet.
Also include the first base and the second base, the first described base is provided with circular groove, described base plate is arranged in circular groove, described circular groove is circumferentially with some spring eyes, the first spring is provided with in described spring eye, on the first described spring, cover has smooth plastics part, described smooth plastics part props up the side of base plate, the first through hole inserted for turning axle is had in described circular groove, the second described base is also provided with the second through hole inserted for turning axle, described turning axle is fixed in the second through hole by jump ring.
Also include upper cover, described upper cover is arranged on the side of circuit board away from the first coil, and described upper cover is connected with the first base engagement.
Described turning axle is fixed with location division away from one end of derby, and described location division is provided with screw through-hole, is provided with the second spring and is screwed into screw in described screw through-hole.
Described location division has limited block away from one end of turning axle, and the movement locus that the second described base rotates along location division is provided with block, and described limited block has two, and the angle that two limited blocks are formed to the line at center, location division is slightly less than 180 °.
The beneficial effects of the utility model are, the utility model angular transducer, (1) thickness of derby is utilized to increase progressively gradually, realize changing with the distance of the coil on circuit board, produce the mutual inductance effect of varying strength, inductive sensing chip detection goes out the impedance of coil and inductance changes, and physical construction is simple, overhaul very convenient, (2) adopt advanced Inductive Sensing Technique to avoid high-intensity magnetic field to disturb; (3) temperature is eliminated on the impact of measurement result by temperature compensation algorithm; (4) stability loosening shaking detection algorithm raising sensor and security is adopted; (5) non-contact type sensing measurement improves the durability of sensor; (6) multimode signal exports, and conforms to market major part angular transducer output form.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is the utility model angular transducer parts exploded views,
Fig. 2 is the utility model angular transducer turning axle bottom schematic view,
Fig. 3 is the structural representation of the utility model angle sensor circuit plate,
Fig. 4 is peripheral circuit and the pin planning chart of control chip,
Fig. 5 is the first inductive sensing chip periphery circuit diagram.
In figure 1, upper cover, 2, circuit board, 3, annular supports sheet, 4, thrust bearing, 5, derby, 6, base plate, 7, working of plastics, 8, joint pin, the 9, first spring, 10, plastic hoop, 11, apron, the 12, first base, 13, turning axle, 14, the second base, the 15, first coil, the 16, first inductive sensing chip, 17, control chip, 18, temperature sensor, 19, external interface, 20, screw through-hole, 21, location division, 22, screw, the 23, second spring, 24, block, 25, limited block.
Embodiment
By reference to the accompanying drawings the utility model is described in further detail now.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present utility model are described in a schematic way, and therefore it only shows the formation relevant with the utility model.
As shown in Figure 1, the utility model angular transducer, comprise circuit board 2, derby 5 and turning axle 13 successively, circuit board 2 is provided with the first coil 15, first coil 15 is oppositely arranged with derby 5, derby 5 near a side surface of the first coil 15 relative to the distance of the first coil 15 with the rotation increasing or decreasing of turning axle 13, one end of turning axle 13 is fixedly connected with the side of derby 5 away from the first coil 15.
Derby 5 is arc, and on the same axis, the thickness of derby 5 is cumulative to the other end by one end for the center of circle of derby 5 and the axle center of turning axle 13.Derby 5 is made of copper.Circuit board 2 is also provided with the first inductive sensing chip 16 and control chip 17, first coil 15 is electrically connected successively with the first inductive sensing chip 16 and control chip 17.
Base plate 6 is also provided with between turning axle 13 and derby 5, also be provided with annular between circuit board 2 and base plate 6 successively and support sheet 3 and collar thrust bearing 4, the annular inner circle radius supporting sheet 3 and collar thrust bearing 4 is greater than the radius of derby 5, derby 5 is positioned at the inner circle that annular supports sheet 3 and collar thrust bearing 4, and it is that non-metal ring supports sheet that annular supports sheet 3.
Angular transducer also includes the first base 12 and the second base 14, first base 12 is provided with circular groove, base plate 6 is arranged in circular groove, circular groove is circumferentially with some spring eyes, and being provided with cover on the first spring 9, first spring 9 in spring eye has smooth plastics part 7, smooth plastics part 7 props up the side of base plate 6, have the first through hole inserted for turning axle 13 in circular groove, the second base 14 is also provided with the second through hole inserted for turning axle 13, turning axle 13 is fixed in the second through hole by jump ring.
Turning axle 13 is fixed with location division 21 away from one end of derby 5, and location division 21 is provided with screw through-hole 20, is provided with the second spring 23 and is screwed into screw 22 in screw through-hole 20.Location division 21 has limited block 25 away from one end of turning axle 13, the movement locus that second base 14 rotates along location division 21 is provided with block 24, limited block 25 has two, the angle that two limited blocks 25 are formed to the line at center, location division 21 is slightly less than 180 °, and is positioned at the line of block 24 to center, location division 21 and the side of extended line.
Circuit board 2 is separately provided with the second coil and the second inductive sensing chip, the second coil is also electrically connected with control chip 17 with the second inductive sensing chip.Circuit board 2 is provided with temperature sensor 18.Angular transducer also includes upper cover 1, and upper cover 1 is arranged on the side of circuit board 2 away from the first coil 15, and upper cover 1 and the first base 12 are connected.
Principle of work: by rotating bearing circle, driven rotary axle 13 rotates together with derby 5, derby 5 surface changes with the distance of the first coil 15 thereupon, first coil 15 changes with the distance of derby 5 mutual inductance effect producing varying strength, first inductive sensing chip 16 detects that the impedance of the first coil 15 and inductance change, control chip 17 reads and writes the first inductive sensing chip 16 by agreement, measures the angle of turning axle 13 and is converted into multi-form electric signal output.
Specifically, owing to not changing when turning axle 13, namely when the anglec of rotation is constant, geo-stationary must be kept between derby 5 and the first coil 15, the situation of shake can not be had to occur, otherwise can measurement result be affected, base plate 6 is arranged in the circular groove in the first base 12, in circular groove, circumference is provided with spring eye, be provided with cover on the first spring 9, first spring 9 in spring eye and have smooth working of plastics 7, working of plastics 7 and base plate 6 offset, produce the elastic force perpendicular to base plate 6, the distance of such derby 5 and the first coil 15 would not produce shake.The back side of base plate 6 is connected by joint pin 8 with turning axle 13 end, and as shown in Figure 2, turning axle 13 is fixed on the second base 14 li by jump ring, can rotate freely; Screw through-hole 20 is arranged at the bottom of turning axle 13, puts into the second spring 23 and is screwed into screw 22, the size of the rotary resistance of the adjustable turning axle 13 of degree of tightness of adjusting screw 22 in screw through-hole 20.Due to the spring force at base plate 6 back side, make base plate 6 front and annular support sheet 3 to be close together, support the friction of sheet 3 to reduce base plate 6 front and annular, base plate 6 and annular are supported between sheet 3 and are provided with thrust bearing 4, and the axle center of thrust bearing 4 and the center of circle of derby 5 are on the same axis.Support sheet 3 due to circuit board 2 and annular directly to contact, so the material that annular supports sheet 3 is nonmetallic materials.
Derby 5 back side is socket-connected by joint pin 8 and turning axle 13 end, the rotation of such turning axle 13 just can drive the rotation of derby 5, thus the distance of the just right derby 5 of the first coil 15 will evenly increase along with the rotation of turning axle 13 or reduce, first coil 15 changes with the distance of derby 5 mutual inductance effect producing varying strength, first inductive sensing chip 16 detects that the impedance of the first coil 15 and inductance change, control chip 17 reads and writes the first inductive sensing chip 16 by agreement, measure the angle of turning axle 13 and be converted into multi-form electric signal and export from external interface 19.
Sensor upper cover 1 is also screwed on the first base 12, and the first base 12 is fixed on the second base 14.
As shown in Figure 3, in order to solve the impact of temperature on measurement result, two kinds of embodiments are had.
Embodiment 1: separately set one piece of second inductive sensing chip and the second coil (as marking in figure) on the circuit board 2, second inductive sensing chip and the second coil and the first inductive sensing chip 16 and the first coil 15 rotational symmetry are arranged, and derby 5 is when rotating with turning axle 13, relatively change without distance with the second coil, second inductive sensing chip is not therefrom by the impact that turning axle 13 rotates, and be only subject to the impact of temperature, and because temperature is on the impact of measurement result linearly trend, compare so do numerical value by the data drawn two chip blocks, thus the impact of temperature can be eliminated.
Embodiment 2: be provided with temperature sensor 18 on the circuit board 2, temperature sensor 18 takes measurement of an angle the temperature of sensor internal, control chip 17 reads this temperature value, and draw temperature compensation algorithm according to the linear relationship of temperature and measurement result, eliminate temperature to the impact of measured value by this algorithm.
This temperature compensation algorithm is:
Pro_real＝Proximity-K_estimate*(temperature-T)
Wherein:
Proximity is the raw data that control chip 17 reads the first inductive sensing chip 16;
K_estimate is temperature coefficient;
Temperature is the temperature that control chip 17 reading temperature sensor 18 measures angular transducer inside;
T is the reference temperature point of setting.
Pro_real is the value at reference temperature point after the impact that temperature compensation algorithm eliminates temperature
Circuit board 2 is provided with external interface 19, and external interface 19 is provided with the complementary analog signal output of DA, and PWM ripple exports, CAN interface, serial communication interface and supply voltage interface.Control chip 17, by the first inductive sensing chip 16 data of collecting and temperature sensor eighteen data COMPREHENSIVE CALCULATING, draws stable angle value, then sends out in the mode of PWM ripple, two-way complementary mold analog signal, CAN signal.
The utility model core is the mutual inductance effect of the first coil 15 and derby 5 be connected with the first inductive sensing chip 16, magnetic field can be formed after first coil 15 galvanization, derby 5 is corresponding with the first coil 15, the impact that derby 5 surface will be subject to the first coil 15 forms eddy effect, eddy effect can produce magnetic field equally, and reacting on the first coil 15, this phenomenon is mutual inductance effect, and the first inductive sensing chip 16 detects impedance and the inductance value of the first coil 15.Eddy effect is relevant with multifactor, and in other factor inconvenience situations, the distance only changing derby 5 surface and the first coil 15 can affect the size of the first coil 15 impedance and inductance.Due to, inductance is consistent with impedance with the effect of distance change, and impedance will be sensitive to distance change relative to inductance, explains so the utility model is changed to example to impedance with distance.The change of distance be here have angle change produce, the corresponding and no distance of different angles, thus finally obtain be angle change cause change in impedance value.The corresponding data list of impedance and angle can be drawn by experiment, then the functional relation of angle and impedance can be obtained by Function Fitting.But the impedance variation relation corresponding from 0 ° to 180 ° only then needs with a function representation functional equation using more than 3 times, and number of times is higher, function more degree of fitting is higher, but corresponding parameter is more, more than 3 times equations add that parameter is all the double-precision floating point type numerical value of double type, and such calculated amount burden for single-chip microcomputer is very large.So angle and impedance or inductance relation can be represented by piecewise function, while ensureing high degree of fitting, reduce the figure place of parameter, reduce single-chip microcomputer burden, accelerate its arithmetic speed.
The relation function of angle and impedance is every 10 ° of segmentations.Every section of function only has parameter different, and other are consistent.Function is:
angle＝(i-1)*10+(Pro_real-Rp_preference[i-1])/Rp_K_para[i-1]；
Wherein:
I is piecewise function sequence;
Pro_real is the resistance value after temperature compensation algorithm;
Normal impedance when Rp_preference [i-1] is the i-1 several times angle of angle 10 ° for sequence, as when i is 1 being the normal impedance of 0 ° of angle;
Rp_K_para [i-1] for sequence be the rate of change that angle often changes 10 ° of normal impedances.
Signal processing mode used by the technical program is mainly divided into four parts:
(1) control chip 17 is the high performance chips based on Cortex-M3 kernel, and control chip 17 collects the data of the first inductive sensing chip 16 and the data of temperature sensor 18.
(2) control chip 17 eliminates temperature to the impact of the first coil 15 impedance, inductance by temperature compensation algorithm.
(3) control chip 17 calculates angle value by the function of angle and impedance.
(4) control chip 17 is by loosening shaking detection algorithm, the correctness of checking angle value.
(5) control chip 17 converts angle value to PWM ripple, and the form of DA complementary mold analog signal and CAN data exports.
Circuit design principle of the present utility model:
As shown in Figure 4, peripheral circuit and the pin planning of control chip 17, this chip adopts 3.3v direct-flow voltage regulation source to power, four road I/O mouths are used to read and write the first inductive sensing chip 16, adopt a road I/O mouth reading temperature sensor information 18, and DA delivery outlet is set, PWM ripple delivery outlet, CAN IO interface and AccessPort interface.
As shown in Figure 5, be the first inductive sensing chip 16 peripheral circuit diagram, L2 represents the first coil 15, the SCLK of the first inductive sensing chip 16, SDI, SDO and TBCLK are connected respectively at the I/O mouth of control chip 17, collect the control information of control chip 17 and send data.
With above-mentioned according to desirable embodiment of the present utility model for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this utility model technological thought, can carry out various change and amendment completely.The technical scope of this utility model is not limited to the content on instructions, must determine its technical scope according to right.
Claims (10)
1. an angular transducer, it is characterized in that: comprise circuit board (2) successively, derby (5) and turning axle (13), described circuit board (2) is provided with the first coil (15), described the first coil (15) and derby (5) are oppositely arranged, described derby (5) near a side surface of the first coil (15) relative to the distance of the first coil (15) with the rotation increasing or decreasing of turning axle (13), one end of described turning axle (13) is fixedly connected with the side of derby (5) away from the first coil (15).
2. angular transducer according to claim 1, it is characterized in that: described derby (5) is arc, on the same axis, the thickness of described derby (5) is cumulative to the other end by one end for the center of circle of derby (5) and the axle center of turning axle (13).
3. angular transducer according to claim 2, it is characterized in that: described circuit board (2) is also provided with the first inductive sensing chip (16) and control chip (17), described the first coil (15) is electrically connected successively with the first inductive sensing chip (16) and control chip (17).
4. angular transducer according to claim 3, it is characterized in that: described circuit board (2) is separately provided with the second coil and the second inductive sensing chip, the second described coil is also electrically connected with control chip (17) with the second inductive sensing chip.
5. angular transducer according to claim 3, is characterized in that: described circuit board (2) is provided with temperature sensor (18).
6. angular transducer according to claim 1, it is characterized in that: between described turning axle (13) and derby (5), be also provided with base plate (6), also be provided with annular between described circuit board (2) and base plate (6) successively and support sheet (3) and collar thrust bearing (4), the inner circle radius that described annular supports sheet (3) and collar thrust bearing (4) is greater than the radius of derby (5), described derby (5) is positioned at the inner circle that annular supports sheet (3) and collar thrust bearing (4), it is that non-metal ring supports sheet that described annular supports sheet (3).
7. angular transducer according to claim 6, it is characterized in that: also include the first base (12) and the second base (14), described the first base (12) is provided with circular groove, described base plate (6) is arranged in circular groove, described circular groove is circumferentially with some spring eyes, the first spring (9) is provided with in described spring eye, the upper cover of described the first spring (9) has smooth plastics part (7), described smooth plastics part (7) props up the side of base plate (6), the first through hole inserted for turning axle (13) is had in described circular groove, described the second base (14) is also provided with the second through hole inserted for turning axle (13), described turning axle (13) is fixed in the second through hole by jump ring.
8. angular transducer according to claim 7, it is characterized in that: also include upper cover (1), described upper cover (1) is arranged on the side of circuit board (2) away from the first coil (15), and described upper cover (1) and the first base (12) are connected.
9. angular transducer according to claim 7, it is characterized in that: described turning axle (13) is fixed with location division (21) away from one end of derby (5), described location division (21) is provided with screw through-hole (20), is provided with the second spring (23) and is screwed into screw (22) in described screw through-hole (20).
10. angular transducer according to claim 9, it is characterized in that: described location division (21) has limited block (25) away from one end of turning axle (13), described the second base (14) is provided with block (24) along the movement locus that location division (21) rotate, described limited block (25) has two, and the angle that two limited blocks (25) are formed to the line at location division (21) center is slightly less than 180 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520265592.XU CN205037862U (en) | 2015-04-28 | 2015-04-28 | Angle sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520265592.XU CN205037862U (en) | 2015-04-28 | 2015-04-28 | Angle sensor |
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| Publication Number | Publication Date |
|---|---|
| CN205037862U true CN205037862U (en) | 2016-02-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520265592.XU Active CN205037862U (en) | 2015-04-28 | 2015-04-28 | Angle sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111765841A (en) * | 2020-07-01 | 2020-10-13 | 清华四川能源互联网研究院 | Non-contact angle displacement sensor based on giant magnetoresistance effect and measurement method |
-
2015
- 2015-04-28 CN CN201520265592.XU patent/CN205037862U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111765841A (en) * | 2020-07-01 | 2020-10-13 | 清华四川能源互联网研究院 | Non-contact angle displacement sensor based on giant magnetoresistance effect and measurement method |
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Effective date of registration: 20211008 Address after: 310000 Room 309, 3 / F, building 3, No. 9, Jiuhuan Road, Jiubao Town, Jianggan District, Hangzhou City, Zhejiang Province Patentee after: Hangzhou Lianhe Nuclear Technology Co.,Ltd. Address before: 314300 room 307, building 2, West District, No. 211, Yanbei Road, Wuyuan street, Haiyan County, Jiaxing City, Zhejiang Province Patentee before: JIAXING HAIGELISI ELECTRONIC TECHNOLOGY Co.,Ltd. |