CN205482784U - Capacitanc angle displacement sensor - Google Patents
Capacitanc angle displacement sensor Download PDFInfo
- Publication number
- CN205482784U CN205482784U CN201521125911.3U CN201521125911U CN205482784U CN 205482784 U CN205482784 U CN 205482784U CN 201521125911 U CN201521125911 U CN 201521125911U CN 205482784 U CN205482784 U CN 205482784U
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- electric field
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- rotor
- metal
- angular sensor
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Abstract
The utility model discloses a capacitanc angle displacement sensor, including capacitanc position -sensing unit and processing circuit, the capacitanc position -sensing unit includes stator and rotor, the rotor rotate arouse with the regular change of electric field between the stator, the stator detects the change and the output of the analog signal in the cycle that turns into of electric field, processing circuit is used for gathering analog signal exports the angle displacement digital quantity, the capacitanc position -sensing unit with processing circuit connects. The utility model provides an interference immunity is good, simple structure, small capacitanc angle displacement sensor.
Description
Technical field
This utility model relates to a kind of angle displacement transducer technical field, in particular, relates to a kind of capacitive angular sensor.
Background technology
Angular displacement sensor is the one of sensor, is the displacement transducer that the physical quantity such as spin angular position, angular displacement is converted to the signal of telecommunication.It it is the sensor for detection angles, speed, length, displacement and acceleration in automatic field.Its application is big to be controlled to Digit Control Machine Tool, robot, package packing machine, printing machinery, elevator, the position detection of factory automation relevant device, transmission speed, the measurement of the little rotation amount to the business automation equipment such as disk, printer and control, it has also become the part that every field is indispensable.
At present, existing multiple rotational angle displacement sensor, can be divided into optical encoder, magnetic encoder etc. according to the principle of detection on the market.Wherein, optical rotary coder application is more, and magnetic encoder takes second place.
Optical encoder is divided into absolute encoder and incremental encoder, is output as binary square-wave signal.More commonly, reason is that its structure is smooth, cheap to the encoder applies of increment type, but it has the disadvantages that the specified point that light beam must be concentrated on CD by optical encoder, and the most this kind of encoder is the most sensitive to mechanical assembly and alignment error.The structure of this kind of encoder is only capable of the mechanical service life providing limited.In the presence of a harsh environment, as inferior in being often subject to mechanical shock, vibrate or being in hot environment, the photoelectric code disk in encoder is highly susceptible to the impact of external factor and damages.
Magnetic coder generally comprises permanent magnet material and magnet-sensitive element, causes magnetic flux power to change by permanent magnet material element rotation, and the magnetic flux of change is converted into corresponding numeral or pulse signal after sensing element.This kind of encoder uses permanent magnet material the most relatively durable as core component.Owing to using magnetic material and sensing element, the most easily affected by periphery electromagnetic environment.
Therefore it provides the capacitive angular sensor that a kind of anti-interference is good, simple in construction, volume are little, become the technical problem that those skilled in the art are urgently to be resolved hurrily.
Utility model content
Technical problem to be solved in the utility model is to provide the capacitive angular sensor that a kind of anti-interference is good, simple in construction, volume are little.
The purpose of this utility model is achieved through the following technical solutions: a kind of capacitive angular sensor, including: capacitance type sensitivity part, described capacitance type sensitivity part includes stator, rotor, described rotor rotates and causes the regular change of the electric field between described stator, and described stator detects the change of described electric field and is converted into modulus of periodicity plan signal output；Signal processing circuit, is used for gathering described analogue signal angle displacement digital quantity；Described capacitance type sensitivity part and described signal processing circuit connect, and are arranged with shading ring outside described capacitance type sensitivity part, described shading ring electric jamming source around shield sensor.
Preferably, described stator includes one or more, described stator includes electric field reception device and electric field discharger, described electric field discharger is used for launching electric field, described electric field discharger includes electric field radiating circuit and metal emitting plate, including on described metal emitting plate that at least one transmission channel, described electric field reception device are used for receiving electric field, described electric field reception device includes that electric field reception circuit and metal receive pole plate.
Preferably, described stator is one, described electric field radiating circuit uses quadrature excitation, described metal emitting plate uses the form of fan-shaped grid to be divided into unit, and each described unit is divided into four grids of equal portions, corresponds respectively to four tunnel excitations of four phase quadrature excitation, it is 0 ° that described four grids connect phase place respectively, 90 °, 180 °, 270 °.
Preferably, described metal emitting plate uses multiple unit, and the number of described unit is the n power of 2, and n is the integer more than zero, and described unit is arranged on the surface of metal emitting plate uniformly.
Preferably, described stator is two, described electric field reception device is arranged on a stator, described electric field discharger is arranged on another stator, described metal emitting plate includes two transmission channels and central authorities' annulus, and described two transmission channels, centered by described central authorities annulus, are evenly distributed in the outside of described central authorities annulus, described rotor uses plastic material, and described rotor edge is provided with multiple groove being evenly arranged.
Preferably, two described metal transmission channels are respectively the first transmission channel and the second transmission channel, described first transmission channel includes 2m1-1 unit, m1 is the integer more than zero, described second transmission channel includes 2m2 unit, m2 is the integer more than zero, and each unit of described two transmission channels is corresponding with the center of described central authorities annulus.
Preferably, described rotor uses plastic material, and with metal conducting layer on described rotor, described metal conducting layer includes that periodic patterns, described rotor edge are provided with periodic groove.
Preferably, described electric field reception circuit receives pole plate with described metal and is connected, described reception pole plate is the most corresponding with the central annulus of described two passages of transmitting pole plate, being shaped as of corresponding first transmission channel of described metal reception pole plate is latticed, and being shaped as of corresponding second transmission channel of described metal reception pole plate is cellular.
Preferably, described signal processing circuit is integrated on signal processing circuit board, and described signal processing circuit electrically connects with described electric field reception device.
Preferably, described stator and rotor are all annular, are provided with gap between described stator and rotor, and described stator and rotor outer periphery are arranged with shading ring, described shading ring electric jamming source around shield sensor, in the shielding shell of described stator and rotor and shading ring storage and annular.
nullThe beneficial effects of the utility model are，Rotated by rotor and cause regular electric field change between stator，Electric capacity after modulation is demodulated by stator、Detection，Capacitance change and anglec of rotation one_to_one corresponding is made finally by signal processing circuit，Obtain the anglec of rotation，Use capacitance detecting mode，Angular displacement signal is obtained by electric capacity is carried out periodic modulation and demodulation，Because the characteristic of capacitance detecting itself，Spacing is the least more easily detects，Therefore capacitive angular sensor volume is the least、Simple in construction，Simultaneously，Shading ring electric jamming source around shield sensor it is arranged with outside capacitance type sensitivity part，Therefore this capacitive angular sensor has good electromagnetism interference，In this utility model, sensor material does not use the easily damaged parts such as photoetching disc simultaneously，Therefore there is good antivibration、Impact resistance.
A kind of capacitive angular sensor detection method, it is characterised in that comprise the steps:
Rotor is installed with rotating shaft and is connected by A；
Stator is connected by B with signal processing circuit, and described signal processing circuit is connected with upper-computer processing software；
C axis of rotation, rotor driven, cause capacitance between stator to launch change；
The electric capacitance change amount detected is changed into periodic signal output by the receiving device in D capacitance type sensitivity part；
The signal that capacitance type sensitivity part is generated is acquired processing and angle displacement digital quantity by E processing of circuit circuit；
F upper computer software completes error-detecting between capacitance type sensitivity part stator and rotor, analyzes and compensate.
This utility model uses having the beneficial effect that of this angle displacement transducer detection method to cause the electric capacitance change between stator by the regular rotation of rotor, electric capacity after modulation is demodulated by stator, detection, capacitance change and anglec of rotation one_to_one corresponding is made finally by signal processing circuit, obtain the anglec of rotation, after sensor installs, upper computer software and capacitance type sensitivity part and signal processing circuit with the use of, complete the error inspection car between capacitance type sensitivity part stator and rotor, analyze and compensate, so improve the location tolerance that capacitance type sensitivity part is big, ensure the precision of capacitive angular position sensor simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation of this utility model embodiment 1；
Fig. 2 is the structural representation of this utility model embodiment 2；
Fig. 3 is the transmitting pole plate individual unit schematic diagram of this utility model embodiment；
Fig. 4 is the transmitting pole plate schematic diagram of this utility model embodiment.
Wherein: 1, stator, 11, metal emitting plate, 12, unit, 2, rotor, 21, metal receive pole plate, 3, shading ring, 4, shielding shell.
Detailed description of the invention
In description of the present utility model, it is to be understood that term " first ", " second " are only used for describing purpose, and it is not intended that indicate or imply relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or implicitly include one or more this feature.In description of the present utility model, except as otherwise noted, " multiple " are meant that two or more.It addition, term " includes " and any deformation, it is intended that cover non-exclusive comprising.
In description of the present utility model, it should be noted that unless otherwise clearly defined and limited, term " is installed ", " being connected ", " connection " should be interpreted broadly, and connects for example, it may be fixing, it is also possible to be to removably connect, or be integrally connected；Can be to be mechanically connected, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, can be the connection of two element internals.For the ordinary skill in the art, above-mentioned term concrete meaning in this utility model can be understood with concrete condition.
The utility model is described in further detail with preferred embodiment below in conjunction with the accompanying drawings.
Embodiment 1
As shown in Figure 1, the open a kind of capacitive angular sensor of the present embodiment, including capacitance type sensitivity part, capacitance type sensitivity part includes stator 1, rotor 2, stator 1 and rotor 3 are all annular, it is provided with gap between stator 1 and rotor 2, stator 1 and rotor 2 periphery are arranged with shading ring 3, stator 1 and rotor 2 and shading ring 3 are accommodated in the shielding shell 4 of annular, capacitance type sensitivity part is connected with signal processing circuit, shading ring 3 and the shielding shell 4 electric jamming source around shield sensor, therefore this capacitive angular sensor can be effectively improved electromagnetism interference.
Wherein, rotor 2 installation coaxial with stator 1, concentric and parallel, it is ensured that do not rub, and gap is the least, because between stator 1 and rotor 2 being noncontacting proximity sensor, the most convenient is applied in control system.
Wherein, in capacitance type sensitivity part, rotor 2 rotates and causes regular electric field change between stator 1, electric capacity after modulation is demodulated, detects by stator 1, capacitance change and anglec of rotation one_to_one corresponding is made finally by signal processing circuit, obtain the anglec of rotation, use capacitance detecting mode, obtain angular displacement signal by electric capacity is carried out periodic modulation and demodulation.
Wherein, stator 1 includes that a stator 1 includes one or more, and stator 1 includes electric field reception device and electric field discharger, and electric field reception device is used for receiving electric field, and electric field discharger is used for launching electric field.Electric field discharger includes electric field radiating circuit and metal emitting plate, and metal emitting plate includes at least one transmission channel, and in the present embodiment, preferred scheme is the capacitive angular sensor of a stator.
nullFurther，Stator 1 is one，Electric field reception device and electric field discharger are all disposed within stator，Electric field discharger includes electric field radiating circuit and metal emitting plate 11，Electric field radiating circuit uses quadrature excitation，The form of the fan-shaped grid of metal emitting plate 11，Each unit 12 is divided into four grids of equal portions，Correspond respectively to four tunnel excitations of four phase quadrature excitation，It is 0 ° that four grids connect phase place respectively，90°，180°，The sinusoidal excitation circuit of 270 °，Form the first grid respectively、Second grid、3rd grid and the 4th grid，Due to four grids，0 ° and 180 °，90 ° and 270 ° of applied excitation phase contrast，Therefore by time in parallel with the electric capacity receiving pole plate formation for four grids，First grid and the 3rd grid are relative，And capacitance signal carries out calculus of differences each other；Second grid and the 4th grid are relative, and capacitance signal carries out calculus of differences each other.Therefore, sensor is affected less by common mode disturbances, such as good temp characteristic, and noise is little, and resolution is high.
Four grids can also use square-wave signal can also use sinusoidal signal, in this utility model, preferred scheme is square-wave signal, in the case of art technology person people does not pays creative work, it is impossible to think that the signal that four grids produce is only sinusoidal signal or square-wave signal.
As in figure 2 it is shown, launch pole plate to include that individual unit 12, individual unit 12 include four grids；It is of course also possible to two or three grids are set, or other number.
As it is shown on figure 3, launch pole plate to include multiple unit 12, unit 12 is arranged on endless metal uniformly and launches the surface of pole plate 11, and the quantity of unit 12 is preferably the n power of 2, and n is the integer more than zero, owing to emitter stage have employed multiple unit, and is uniformly distributed.Therefore, it can the electric capacitance change effectively preventing rotor from being caused due to inclination with stator.Inclination alignment error between sensor system under test (SUT) and rotating shaft is reduced, and shock resistance is good.
Further, electric field reception device includes: electric field reception circuit, metal receive pole plate 11.Both can be fabricated separately, and reconnects, it is possible to being together produced in printed board, electric field reception device is provided with Synchronous Detection simultaneously.
Wherein, rotor 2 uses plastic material, rotor is for forming electric field with stator, with metal conducting layer on rotor 2, metal conducting layer includes periodic patterns, rotor 2 is smooth sinusoidal envelope with the edge of periodicity conductive pattern, with the rotor of this characteristic, electric field is modulated so that electric field reception device produces periodic sinusoidal signal.Certainly rotor 2 can be there to be another kind of form, and the surface of rotor does not set metal conducting layer, simply uses periodic edge in external form.Rotor uses both form both can apply and can also apply in example 2 in embodiment 1.
Embodiment 2
Such as Fig. 3, shown in 4, compared with Example 1, in embodiment 2, the quantity of stator is two, electric field reception device is arranged on a stator 1, electric field discharger is arranged on another stator 1, metal emitting plate 11 includes two transmission channels and central authorities' annulus, two transmission channels are centered by described central authorities annulus, it is evenly distributed in the outside of central authorities' annulus, metal emitting plate includes the first transmission channel and the second transmission channel, first transmission channel includes 2m1-1 unit, m1 is the integer more than zero, second transmission channel includes 2m2 unit, m2 is also the integer more than zero, each unit of two transmission channels is corresponding with the center of described central authorities annulus.Owing to odd number unit and many counting units all have corresponding angle with central circular, therefore absolute Angle Position can be determined by unique corresponding relation between the first each unit of transmission channel and between each unit of the second transmission channel.Absolute Angle Position is used to determine mode, it is achieved that the measurement of absolute angle.The anglec of rotation can be measured more accurately.Simultaneously as absolute position exports more than 360 ° of rotating ranges, rotation angle measurement can be improved so that range of dynamic measurement is wider.
Wherein, receive device and include that electric field reception circuit, metal receive pole plate 21, electric field reception circuit receives pole plate 21 with metal and is connected, it is corresponding that metal receives pole plate 21 annulus central with metal emitting plate 11, being shaped as of metal reception corresponding first transmission channel of pole plate 21 is latticed, and being shaped as of metal reception corresponding first transmission channel of pole plate 21 is cellular.
Wherein, rotor uses plastic material to make, and this rotor edge is periodic groove.
The present embodiment causes the electric field change between stator 1 by the regular rotation of rotor 2, electric capacity after modulation is demodulated by stator 1, detection, capacitance change and anglec of rotation one_to_one corresponding is made finally by signal processing circuit, obtain the anglec of rotation, use capacitance detecting mode, angular displacement signal is obtained by electric capacity is carried out periodic modulation and demodulation, because the characteristic of capacitance detecting itself, spacing is the least more easily detects, therefore capacitive angular sensor volume is the least, simple in construction, simultaneously, shading ring electric jamming source around shield sensor it is arranged with outside capacitance type sensitivity part, therefore this capacitive angular sensor has good electromagnetism interference, in this utility model, sensor material does not use the easily damaged parts such as photoetching disc simultaneously, therefore there is good antivibration, impact resistance.
Other setting of the capacitive angular sensor of the present embodiment and technique effect are identical with embodiment one, illustrate the most one by one.
Embodiment 3
A kind of use the detection method of capacitive angular sensor in embodiment 1 or embodiment 2, in conjunction with Fig. 1 to Fig. 4, comprise the steps:
Rotor 2 is installed with rotating shaft and is connected by A；
Stator 1 is connected by B with signal processing circuit, and described signal processing circuit is connected with host computer；
C axis of rotation, rotor driven 2, cause electric field change between stator 1；
The electric field change detected is changed into periodic signal output by the device that receives in D capacitance type sensitivity part；
The signal that capacitance type sensitivity part is generated is acquired processing and angle displacement digital quantity by E processing of circuit circuit；
F upper computer software completes error-detecting between capacitance type sensitivity part stator and rotor, analyzes and compensate.
The present embodiment causes regular electric field change between stator 1 by the rotation of rotor 2, electric capacity after modulation is demodulated, detects by stator 1, capacitance change and anglec of rotation one_to_one corresponding is made finally by signal processing circuit, obtain the anglec of rotation, after sensor installs, upper computer software and capacitance type sensitivity part and signal processing circuit with the use of, complete the error-detecting between capacitance type sensitivity part stator 1 and rotor 2, analyze and compensate, so improve the location tolerance that capacitance type sensitivity part is big, ensure the precision of capacitive angular position sensor simultaneously.
Above content is to combine concrete preferred implementation further detailed description of the utility model, it is impossible to assert that of the present utility model being embodied as is confined to these explanations.For this utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, it is also possible to make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.
Claims (10)
1. a capacitive angular sensor, it is characterised in that including:
Capacitance type sensitivity part, described capacitance type sensitivity part includes stator, rotor, and described rotor rotates and draws
Playing the regular change of electric field between described stator, described stator detects the change of described electric field also
It is converted into modulus of periodicity and intends signal output；
Signal processing circuit, is used for gathering described analogue signal angle displacement digital quantity；
Described capacitance type sensitivity part and described signal processing circuit connect, described capacitance type sensitivity part overcoat
It is provided with shading ring, described shading ring electric jamming source around shield sensor.
A kind of capacitive angular sensor the most according to claim 1, it is characterised in that institute
State stator and include that electric field reception device and electric field discharger, described electric field discharger are used for launching electricity
, described electric field discharger includes electric field radiating circuit and metal emitting plate, and described metal is launched
Include on pole plate that at least one transmission channel, described electric field reception device are used for receiving electric field, described electricity
Field receives device and includes that electric field reception circuit and metal receive pole plate.
A kind of capacitive angular sensor the most according to claim 2, it is characterised in that institute
Stating stator is one, and described electric field radiating circuit uses quadrature excitation, and described metal emitting plate uses
The form of fan-shaped grid is divided into unit, and each described unit is divided into four grids of equal portions, respectively correspondence
In four tunnel excitations of four phase quadrature excitation, it is 0 ° that described four grids connect phase place respectively, 90 °,
180 °, 270 °.
A kind of capacitive angular sensor the most according to claim 3, it is characterised in that institute
Stating metal emitting plate and use multiple unit, the number of described unit is the n power of 2, and n is for being more than
The integer of zero, described unit is arranged on the surface of metal emitting plate uniformly.
A kind of capacitive angular sensor the most according to claim 2, it is characterised in that institute
Stating stator is two, and described electric field reception device is arranged on a stator, described electric field discharger
Being arranged on another stator, described metal emitting plate includes two transmission channels and central authorities' annulus,
Described two transmission channels, centered by described central authorities annulus, are evenly distributed in outside described central authorities annulus
Side, described rotor uses plastic material, and described rotor edge is provided with multiple groove being evenly arranged.
A kind of capacitive angular sensor the most according to claim 5, it is characterised in that two
Individual described metal transmission channel is respectively the first transmission channel and the second transmission channel, and described first launches
Passage includes 2m1-1 unit, and m1 is the integer more than zero, and described second transmission channel includes 2m2
Individual unit, m2 is the integer more than zero, each unit of described two transmission channels and described central authorities annulus
Center corresponding.
A kind of capacitive angular sensor the most according to claim 2, it is characterised in that institute
The rotor stated uses plastic material, and described rotor at least includes the metallic conduction being provided with periodic patterns
Layer and edge are provided with the one of which of periodic groove.
A kind of capacitive angular sensor the most according to claim 5, it is characterised in that institute
State electric field reception circuit to be connected with described metal reception pole plate, described reception pole plate and described transmitting pole plate
The central annulus of two passages correspondence respectively, described metal receives the shape of corresponding first transmission channel of pole plate
Shape is latticed, and being shaped as of corresponding second transmission channel of described metal reception pole plate is cellular.
A kind of capacitive angular sensor the most according to claim 2, it is characterised in that institute
The signal processing circuit stated is integrated on signal processing circuit board, described signal processing circuit and described electricity
Field receives device electrical connection.
A kind of capacitive angular sensor the most according to claim 1, it is characterised in that
Described stator and rotor are all annular, are provided with gap between described stator and rotor, described stator and turning
Sub-periphery is arranged with shading ring, described shading ring electric jamming source around shield sensor, institute
State in the shielding shell of stator and rotor and shading ring storage and annular.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521125911.3U CN205482784U (en) | 2015-12-29 | 2015-12-29 | Capacitanc angle displacement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521125911.3U CN205482784U (en) | 2015-12-29 | 2015-12-29 | Capacitanc angle displacement sensor |
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| Publication Number | Publication Date |
|---|---|
| CN205482784U true CN205482784U (en) | 2016-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201521125911.3U Withdrawn - After Issue CN205482784U (en) | 2015-12-29 | 2015-12-29 | Capacitanc angle displacement sensor |
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| CN (1) | CN205482784U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105486222A (en) * | 2015-12-29 | 2016-04-13 | 崔星 | Capacitance angular displacement sensor |
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2015
- 2015-12-29 CN CN201521125911.3U patent/CN205482784U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105486222A (en) * | 2015-12-29 | 2016-04-13 | 崔星 | Capacitance angular displacement sensor |
| CN105486222B (en) * | 2015-12-29 | 2019-04-19 | 崔星 | A kind of capacitive angular sensor |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160817 Effective date of abandoning: 20190419 |