CN105180798B - Angular transducer - Google Patents
Angular transducer Download PDFInfo
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- CN105180798B CN105180798B CN201510208789.4A CN201510208789A CN105180798B CN 105180798 B CN105180798 B CN 105180798B CN 201510208789 A CN201510208789 A CN 201510208789A CN 105180798 B CN105180798 B CN 105180798B
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- metal derby
- circuit board
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Abstract
The present invention relates to a kind of angular transducer, include circuit board, metal derby and rotary shaft successively, circuit board is provided with first coil, first coil is oppositely arranged with metal derby, metal derby close to a side surface of first coil relative to the distance of first coil with the rotation increasing or decreasing of rotary shaft, one end of rotary shaft is fixedly connected with side of the metal derby away from first coil.The present invention is gradually incremented by using the thickness of metal derby, is changed to realize with the distance of the coil on circuit board, produces the mutual inductance effect of varying strength, and inductive sensing chip detects that the impedance of coil and inductance change, and mechanical structure is simple, and maintenance is very convenient.
Description
Technical field
The present invention relates to a kind of sensor, more particularly to a kind of angular transducer.
Background technology
The potentiometer of existing angular transducer such as contact, caused by detecting the potentiometer being connected in rotating shaft and sliding
Circuit in voltage change, calculate the corresponding motion conditions of rotating shaft.Its principle is simple, but potentiometer rubs through prolonged slip
Wipe, after resistive element is worn, precision can decline, or even entirely ineffective, so as to cause to lose control of one's vehicle.
It is exactly magnetic position sensor in addition with a kind of situation, rotating excitation field, Ran Houtong is produced using the rotation of permanent magnet
The direction in magnetic potential sensing chip detection magnetic field is crossed, so as to detect the anglec of rotation.But there is also one to ask for such structure
Topic, magnetic potential sensing chip can not work in high-intensity magnetic field, be particularly wall-mounted near motor, be disturbed by the high-intensity magnetic field of motor
And can not normal work.
The content of the invention
In order to solve the above problems, the present invention provides a kind of angular transducer to solve the above problems.
The technical solution adopted for the present invention to solve the technical problems is：A kind of angular transducer, successively including circuit board,
Metal derby and rotary shaft, described circuit board are provided with first coil, and described first coil is oppositely arranged with metal derby, described
Metal derby close to a side surface of first coil relative to the distance of first coil with the rotation increasing or decreasing of rotary shaft, institute
The one end for the rotary shaft stated is fixedly connected with side of the metal derby away from first coil.
Described metal derby is arc, the center of circle of metal derby and the axle center of rotary shaft on the same axis, described metal
The thickness of block is cumulative from one end to the other end.
The first inductive sensing chip and control chip, described first coil and first are additionally provided with described circuit board
Inductive sensing chip and control chip are sequentially connected electrically.
Embodiment 1：It is additionally provided with the second coil and the second inductive sensing chip on described circuit board, described second
Coil also electrically connects with the second inductive sensing chip with control chip.
Embodiment 2：Described circuit board is provided with temperature sensor.
Bottom plate is additionally provided between described rotary shaft and metal derby, ring is also sequentially provided between described circuit board and bottom plate
Shape supports piece and collar thrust bearing, and inner circle radius of the described annular to piece and collar thrust bearing is more than the radius of metal derby,
Described curved metal block is supported in the inner circle of piece and collar thrust bearing positioned at annular, and it is non-metal ring that described annular, which supports piece,
To piece.
Also include first base and second base, described first base is provided with circular groove, and described bottom plate is arranged on
In circular groove, described circular groove is circumferentially with some spring eyes, and the first spring, the first described spring are provided with described spring eye
On be cased with smooth plastics part, described smooth plastics part props up the side of bottom plate, is provided with described circular groove and is inserted for rotary shaft
The first through hole entered, the second through hole for rotary shaft insertion also is provided with described second base, and described rotary shaft passes through
Jump ring is fixed in the second through hole.
Also include lid, described upper lid is arranged on side of the circuit board away from coil, described upper lid and the first bottom
Seat is connected.
The one end of described rotary shaft away from metal derby is fixed with location division, and described location division is provided with screw through-hole,
Second spring is provided with described screw through-hole and is screwed into screw.
The one end of described location division away from rotary shaft has limited block, the fortune that described second base rotates along location division
Dynamic rail mark is provided with block, and described limited block has two, and the angle that the line of two limited blocks to location division center is formed omits
Less than 180 °.
The beneficial effect of invention is angular transducer of the present invention, and (1) is gradually passed using the thickness of metal derby
Increase, change to realize with the distance of the coil on circuit board, produce the mutual inductance effect of varying strength, the detection of inductive sensing chip
The impedance and inductance for going out coil change, and mechanical structure is simple, and maintenance is very convenient, and (2) are kept away using advanced Inductive Sensing Technique
Exempt from high-intensity magnetic field interference；(3) influence of the temperature to measurement result is eliminated by temperature compensation algorithm；(4) using loosening shaking detection
Algorithm improves the stability and security of sensor；(5) non-contact type sensing measurement improves the durability of sensor；(6) it is multi-party
Formula signal output, it is consistent with market major part angular transducer output form.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is angular transducer parts exploded view of the present invention,
Fig. 2 is angular transducer rotary shaft bottom schematic view of the present invention,
Fig. 3 is the structural representation of angle sensor circuit plate of the present invention,
Fig. 4 is the peripheral circuit and pin planning chart of control chip,
Fig. 5 is inductive sensing chip periphery circuit diagram.
1 in figure, upper lid, 2, circuit board, 3, annular support piece, 4, thrust bearing, 5, metal derby, 6, bottom plate, 7, working of plastics, 8,
Connecting pole, the 9, first spring, 10, plastic hoop, 11, apron, 12, first base, 13, rotary shaft, 14, second base, 15, line
Circle, 16, inductive sensing chip, 17, control chip, 18, temperature sensor, 19, external interface, 20, screw through-hole, 21, fixed
Position portion, 22, screw, 23, second spring, 24, block, 25, limited block.
Embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.These accompanying drawings are simplified schematic diagram, only with
Illustration illustrates the basic structure of the present invention, therefore it only shows the composition relevant with the present invention.
As shown in figure 1, angular transducer of the present invention, successively including circuit board 2, metal derby 5 and rotary shaft 13, circuit board 2
First coil 15 is provided with, first coil 15 is oppositely arranged with metal derby 5, and metal derby 5 is close to a side surface of first coil 15
Relative to the distance of first coil 15 with the rotation increasing or decreasing of rotary shaft 13, one end of rotary shaft 13 and metal derby 5 are remote
The side of first coil 15 is fixedly connected.
Metal derby 5 is arc, the center of circle of metal derby 5 with the axle center of rotary shaft 13 on the same axis, the thickness of metal derby 5
It is cumulative from one end to the other end.Metal derby 5 is made of copper.The first inductive sensing chip 16 and control are additionally provided with circuit board 2
Chip 17, first coil 15 are sequentially connected electrically with the first inductive sensing chip 16 and control chip 17.
Bottom plate 6 is additionally provided between rotary shaft 13 and metal derby 5, annular is also sequentially provided between circuit board 2 and bottom plate 6 and supports piece
3 and collar thrust bearing 4, the inner circle radius that annular supports piece 3 and collar thrust bearing 4 is more than the radius of metal derby 5, curved metal
Block 5 is supported in the inner circle of piece 3 and collar thrust bearing 4 positioned at annular, and it is that non-metal ring supports piece that annular, which supports piece 3,.
Angular transducer also includes first base 12 and second base 14, and first base 12 is provided with circular groove, and bottom plate 6 is pacified
In circular groove, circular groove is circumferentially with some spring eyes, is provided with the first spring 9 in spring eye, smooth modeling is cased with the first spring 9
Materials and parts 7, smooth plastics part 7 prop up the side of bottom plate 6, and the first through hole inserted for rotary shaft 13, the second bottom are provided with circular groove
The second through hole inserted for rotary shaft 13 also is provided with seat 14, rotary shaft 13 is fixed in the second through hole by jump ring.
The one end of rotary shaft 13 away from metal derby 5 is fixed with location division 21, and location division 21 is provided with screw through-hole 20, screw
Second spring 23 is provided with through hole 20 and is screwed into screw 22.The one end of location division 21 away from rotary shaft 13 has limited block 25,
The movement locus that second base 14 rotates along location division 21 is provided with block 24, and limited block 25 has two, and two limited blocks 25 arrive
The angle that the line at the center of location division 21 is formed is slightly less than 180 °, and is located at block 24 to the line at the center of location division 21 and prolongs
The side of long line.
The second coil and the second inductive sensing chip, the second coil and the second inductive sensing are additionally provided with circuit board 2
Chip also electrically connects with control chip 17.Circuit board 2 is provided with temperature sensor 18.Angular transducer also includes lid 1, upper lid
1 is arranged on side of the circuit board 2 away from first coil 15, and upper lid 1 is connected with first base 12.
Operation principle：By rotating steering wheel, rotary shaft 13 is driven to be rotated together with metal derby 5, the surface of metal derby 5 and the
The distance of one coil 15 changes therewith, and the distance change of first coil 15 and metal derby 5 produces the mutual inductance effect of varying strength
Should, the first inductive sensing chip 16 detects that the impedance of first coil 15 and inductance change, and control chip 17 is read by agreement
The first inductive sensing chip 16 is write, the angle of rotary shaft 13 is measured and is converted into various forms of electric signal outputs.
Specifically, due to not changing when rotary shaft 13, i.e., when the anglec of rotation is constant, metal derby 5 and first coil 15 it
Between must keep geo-stationary, it is impossible to have shake situation occur, otherwise can influence measurement result, bottom plate 6 is arranged on the first bottom
In circular groove in seat 12, spring eye is circumferentially provided with circular groove, the first spring 9 is provided with spring eye, light is cased with the first spring 9
Sliding working of plastics 7, working of plastics 7 offset with bottom plate 6, produce the elastic force perpendicular to bottom plate 6, such metal derby 5 and first coil 15
Distance would not produce shake.The back side of bottom plate 6 is connected with the end of rotary shaft 13 by connecting pole 8, as shown in Fig. 2 rotation
Rotating shaft 13 is fixed in second base 14 by jump ring, can be rotated freely；Screw through-hole 20, screw are arranged at the bottom of rotary shaft 13
Second spring 23 is put into through hole 20 and is screwed into again with screw 22, the rotation resistance of the elastic adjustable rotary shaft 13 of set screw 22
The size of power.Due to the spring force at the back side of bottom plate 6 so that the front of bottom plate 6 is close together with annular to piece 3, in order to reduce
The friction of piece 3 is supported in the front of bottom plate 6 with annular, and bottom plate 6 and annular are provided with thrust bearing 4, the axle center of thrust bearing 4 between supporting piece 3
With the center of circle of metal derby 5 on the same axis.Because circuit board 2 is directly in contact to piece 3 with annular, so annular is to piece 3
Material is nonmetallic materials.
The back side of metal derby 5 is socket-connected by connecting pole 8 and the end of rotary shaft 13, the rotation can band of such rotary shaft 13
The rotation of dynamic metal derby 5, so as to which the distance of the metal derby 5 of the face of first coil 15 will be uniform with the rotation of rotary shaft 13
Increase reduces, and the distance change of first coil 15 and metal derby 5 produces the mutual inductance effect of varying strength, the first inductance type sense
Survey chip 16 and detect that the impedance of first coil 15 and inductance change, control chip 17 reads and writes the first inductive sensing by agreement
Chip 16, measures the angle of rotary shaft 13 and is converted into various forms of electric signals and exported from external interface 19.
Lid 1 is fixed in first base 12 also by screw on sensor, and first base 12 is fixed in second base 14.
As shown in figure 3, in order to solve influence of the temperature to measurement result, there are two kinds of embodiments.
Embodiment 1：One piece of second inductive sensing chip is separately set on the circuit board 2 and the second coil (is not marked in figure
Go out), the second inductive sensing chip and the second coil and the first inductive sensing chip 16 and the setting of the axial symmetry of first coil 15,
And metal derby 5 is with rotary shaft 13 when rotating, it is relative with the second coil without distance change, the second inductive sensing chip thus without
Being rotated by rotary shaft 13 is influenceed, and only affected by temperature, and because influence of the temperature to measurement result linearly becomes
Gesture, so being compared by doing numerical value to the data that two chips are drawn, so as to eliminate the influence of temperature.
Embodiment 2：Temperature sensor 18 is provided with the circuit board 2, in the measurement angle sensor of temperature sensor 18
The temperature in portion, control chip 17 reads the temperature value, and show that temperature-compensating is calculated according to the linear relationship of temperature and measurement result
Method, influence of the temperature to measured value is eliminated by the algorithm.
The temperature compensation algorithm is：
Pro_real=Proximity-K_estimate* (temperature-T)
Wherein：
Proximity is the initial data that control chip 17 reads inductive sensing chip 16；
K_estimate is temperature coefficient；
Temperature measures the temperature inside angular transducer for the reading temperature sensor 18 of control chip 17；
T is the fiducial temperature point of setting.
Pro_real is in the value of fiducial temperature point after the influence that temperature compensation algorithm eliminates temperature
Circuit board 2 is provided with external interface 19, and external interface 19 is provided with DA complementation analog signal outputs, and PWM ripples export,
CAN interface, serial communication interface and supply voltage interface.The first inductive sensing chip that control chip 17 will collect
16 data and temperature sensor eighteen data COMPREHENSIVE CALCULATING, draw stable angle value, then with PWM ripples, two-way complementation analog signal,
The mode of CAN signal is sent out.
Core of the present invention is the mutual inductance for the first coil 15 and metal derby 5 being connected with the first inductive sensing chip 16
Effect, the galvanization of first coil 15 can form magnetic field afterwards, and metal derby 5 is corresponding with first coil 15, and the surface of metal derby 5 will
Being influenceed to form eddy current effect by first coil 15, eddy current effect can equally produce magnetic field, and react on first coil 15,
This phenomenon is mutual inductance effect, and the first inductive sensing chip 16 detects impedance and the inductance value of first coil 15.Vortex effect
Should be with multifactor relevant, under other factors inconvenience case, only changing the surface of metal derby 5 and the distance of first coil 15 can influence
The impedance of first coil 15 and the size of inductance.Because inductance is consistent with impedance with the effect of distance change, and impedance is relative to electricity
Sense will be sensitive to distance change, thus the present invention to impedance with being explained exemplified by distance change.Here the change of distance is that have
Angle change produces, and different angles is corresponding with no distance, so what is finally given is that angle change causes impedance value
Change.Impedance and the corresponding data list of angle are had been found through experimentation that, then angle and resistance can be obtained by Function Fitting
Anti- functional relation.But only then need to use 3 times with a function representation from impedance variations relation corresponding to 0 ° to 180 °
Functional equation above, and number is higher, and function more degree of fitting is higher, but corresponding parameter is more, 3 above equation
All it is the double-precision floating point type numerical value of double types plus parameter, such amount of calculation is born very big for single-chip microcomputer.
So angle and impedance or inductance relation can be represented by piecewise function, ensure to reduce the position of parameter while high degree of fitting
Number, single-chip microcomputer burden is reduced, accelerates its arithmetic speed.
Angle and the relation function of impedance are once segmented every 10 °.Every section of function only has parameter different, and other are consistent.Letter
Number 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 impedance value after temperature compensation algorithm；
Rp_preference [i-1] is normal impedance of sequence when being the i-1 several times angles of 10 ° of angle, is when such as i being 1
The normal impedance of 0 ° of angle；
Rp_K_para [i-1] is that sequence is the rate of change that angle often changes 10 ° of normal impedances.
Signal processing mode used in the technical program is broadly divided into four parts：
(1) control chip 17 is the high performance chipses based on Cortex-M3 kernels, and control chip 17 collects the first inductance
The data of formula sensor chip 16 and the data of temperature sensor 18.
(2) control chip 17 eliminates temperature to the impedance of first coil 15, the influence of inductance by temperature compensation algorithm.
(3) control chip 17 calculates angle value by angle and the function of impedance.
(4) control chip 17 verifies the correctness of angle value by loosening shaking detection algorithm.
(5) angle value is converted into PWM ripples by control chip 17, and the form of DA complementations analog signal and CAN data is defeated
Go out.
The circuit design principle of the present invention：
As shown in figure 4, it is that the peripheral circuit of control chip 17 and pin planning, the chip use 3.3v direct-flow voltage regulation sources
Power supply, using four road I/O mouths read-write inductive sensing chips 16, temperature sensor information 18 is read using I/O mouths all the way, and set
Put DA delivery outlets, PWM ripple delivery outlets, CAN input/output interface and AccessPort interface.
As shown in figure 5, being the peripheral circuit diagram of inductive sensing chip 16, L2 represents coil 15, inductive sensing chip
SCLK, SDI, SDO and TBCLK are connected respectively at the I/O mouths of control chip 17, collect control information and the transmission of control chip 17
Data.
It is complete by above-mentioned description, relevant staff using the above-mentioned desirable embodiment according to the present invention as enlightenment
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property scope is not limited to the content on specification, it is necessary to determines its technical scope according to right.
Claims (1)
1. a kind of angular transducer, it is characterized in that：Include circuit board (2), metal derby (5) and rotary shaft (13) successively, it is described
Circuit board (2) is provided with first coil (15), and described first coil (15) is oppositely arranged with metal derby (5), described metal
Block (5) is incremented by close to a side surface of first coil (15) relative to the distance of first coil (15) with the rotation of rotary shaft (13)
Or successively decrease, one end of described rotary shaft (13) is fixedly connected with side of the metal derby (5) away from first coil (15)；Described
Metal derby (5) is arc, the center of circle of metal derby (5) with the axle center of rotary shaft (13) on the same axis, described metal derby (5)
Thickness it is cumulative from one end to the other end；The first inductive sensing chip (16) and control are additionally provided with described circuit board (2)
Chip (17), described first coil (15) are sequentially connected electrically with the first inductive sensing chip (16) and control chip (17)；
The second coil and the second inductive sensing chip, described the second coil and the second inductance are additionally provided with described circuit board (2)
Formula sensor chip is also sequentially connected electrically with control chip (17)；Described circuit board (2) is provided with temperature sensor (18)；Described
Bottom plate (6) is additionally provided between rotary shaft (13) and metal derby (5), is also sequentially provided between described circuit board (2) and bottom plate (6)
Annular supports piece (3) and collar thrust bearing (4), and described annular supports piece (3) and the inner circle radius of collar thrust bearing (4) is more than
The radius of metal derby (5), described metal derby (5) is supported in the inner circle of piece (3) and collar thrust bearing (4) positioned at annular, described
Annular support piece (3) be that non-metal ring supports piece；Also include first base (12) and second base (14), the first described bottom
Seat (12) is provided with circular groove, and described bottom plate (6) is arranged in circular groove, and described circular groove is circumferentially with some spring eyes, described
Spring eye in be provided with the first spring (9), be cased with smooth plastics part (7), described smooth plastics on described the first spring (9)
Part (7) props up the side of bottom plate (6), is provided with the first through hole for rotary shaft (13) insertion in described circular groove, and described the
The second through hole for being used for rotary shaft (13) insertion also is provided with two bases (14), described rotary shaft (13) is fixed on by jump ring
In second through hole；Also include lid (1), described upper lid (1) is arranged on one of circuit board (2) away from first coil (15)
Side, described upper lid (1) are connected with first base (12)；The one end of described rotary shaft (13) away from metal derby (5) is consolidated
Surely there is a location division (21), described location division (21) are provided with screw through-hole (20), and the is provided with described screw through-hole (20)
Two springs (23) are simultaneously screwed into screw (22)；The one end of described location division (21) away from rotary shaft (13) has limited block
(25) movement locus that, described second base (14) rotates along location division (21) is provided with block (24), described limited block
(25) there are two, the angle that the line of two limited blocks (25) to location division (21) center is formed is slightly less than 180 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510208789.4A CN105180798B (en) | 2015-04-28 | 2015-04-28 | Angular transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510208789.4A CN105180798B (en) | 2015-04-28 | 2015-04-28 | Angular transducer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105180798A CN105180798A (en) | 2015-12-23 |
| CN105180798B true CN105180798B (en) | 2018-02-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510208789.4A Active CN105180798B (en) | 2015-04-28 | 2015-04-28 | Angular transducer |
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| CN (1) | CN105180798B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106067401B (en) * | 2016-07-25 | 2018-12-21 | 珠海格力电器股份有限公司 | A kind of knob assembly and household electrical appliance |
| WO2019040095A1 (en) * | 2017-08-21 | 2019-02-28 | KSR IP Holdings, LLC | Inductive sensor module assembly with a center signal processor |
| CN109259769A (en) * | 2018-09-26 | 2019-01-25 | 华蓥市铜堡初级中学 | A kind of angular transducer for leg angle measurement |
| CN111175973A (en) * | 2019-12-31 | 2020-05-19 | Oppo广东移动通信有限公司 | Head band adjusting method and adjusting device, computer storage medium and head-mounted equipment |
| TWI778582B (en) * | 2021-04-15 | 2022-09-21 | 桃苗汽車股份有限公司 | Sensor installation angle inspection device and method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2856416A1 (en) * | 1978-12-28 | 1980-07-10 | Bosch Gmbh Robert | Revolution speed and position inductive angle segment transducer - has inductive coil with two=piece E=shaped core with large segment width |
| DE3824534A1 (en) * | 1988-07-20 | 1990-01-25 | Bosch Gmbh Robert | MEASURING DEVICE FOR CONTACTLESS DETERMINATION OF A WAY AND / OR ANGLE CHANGE |
| US6305234B1 (en) * | 2000-01-27 | 2001-10-23 | Edward L. Thies | Absolute encoder |
| DE102011085737A1 (en) * | 2011-11-03 | 2013-05-08 | Continental Teves Ag & Co. Ohg | Angular sensor based on eddy current |
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2015
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