CN102818518B - Rotary-angle measuring device - Google Patents
Rotary-angle measuring device Download PDFInfo
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- CN102818518B CN102818518B CN201210288155.0A CN201210288155A CN102818518B CN 102818518 B CN102818518 B CN 102818518B CN 201210288155 A CN201210288155 A CN 201210288155A CN 102818518 B CN102818518 B CN 102818518B
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Abstract
The invention discloses a rotary-angle measuring device. The rotary-angle measuring device comprises an excitation power supply E for providing excitation signals to a rotary-angle sensor, wherein the rotary-angle sensor converts a rotary angle into voltage signals A and B and consists of variable capacitors C1 and C2 with variable capacitance value and capacitors Ca and Cb with constant capacitance value. The rotary-angle measuring device also comprises voltage followers A1 and A2, analog-to-digital converters M1 and M2, a data processor and an operation amplifying power supply, wherein the voltage followers A1 and A2 are used for carrying out impedance conversion on the voltage signals A and B; the analog-to-digital converters M1 and M2 are used for converting the voltage signals output by the voltage followers A1 and A2 into digital signals; the data processor is used for carrying out operation processing on the digital signals; the operation amplifying power supply is used for providing working power for the voltage followers. The rotary-angle measuring device is characterized in that the excitation power supply E is a direct-current voltage-stabilizing power supply; and the voltage followers A1 and A2 consist of high-input-impedance operation amplifiers. The rotary-angle measuring device disclosed by the invention has the advantages of simple structure of a measuring circuit, lower manufacturing cost and higher rotary-angle conversion accuracy and electromagnetic interference resistance.
Description
Technical field
A kind of corner measuring apparatus, comprise variable condenser, capacitance-voltage change-over circuit, analog to digital conversion circuit, data processing circuit, when the rotating shaft of variable condenser is rotated, its capacitance can produce the variation corresponding with the corner value of rotating shaft, and the rotating shaft of variable condenser is connected with tested rotating object, for detection of the anglec of rotation of rotating object.
Background technology
With optical encoder, rotary transformer convert the corner of rotating object to corresponding electric signal conventionally, then the data of electric signal are processed, draw corresponding corner; Optical encoder at high temperature, severe cold, humidity, at a high speed, the occasion of high vibrations cannot normally work, and optical encoder price is higher, application is restricted; Rotary transformer can be worked under rugged environment, has stronger interference free performance and higher conversion accuracy, but higher with supporting high-frequency excitation signal circuit for generating, the metering circuit price of rotary transformer, increases use cost.
Summary of the invention
The technical problem to be solved in the present invention is, a kind of corner measuring apparatus is provided, the metering circuit of this measurement mechanism forms simple, manufacturing cost is lower, and there is higher corner conversion accuracy and anti-electromagnetic interference performance, its technical scheme is: comprise the excitation power supply E that pumping signal is provided to rotary angle transmitter 1, rotary angle transmitter 1 converts corner to voltage signal A, B, and it consists of capacitance variable variable condenser C1, C2 and fixing capacitor Ca, the Cb of capacitance; Comprise the voltage follower A1, the A2 that voltage signal A, B are carried out to impedance transformation, the voltage signal of voltage follower A1, A2 output is converted to analog to digital converter M1, the M2 of digital signal, digital signal is carried out to the data processor of calculation process; And provide the amplifier power supply of working power for voltage follower;
The moving plate 31,32 of described variable condenser C1, C2 is arranged in a rotating shaft 4, and rotating shaft 4 is connected with tested rotating object, moving plate 31,32 and rotating shaft 4 synchronous rotaries; The stator 41 of variable condenser C1 and the stator 42 of variable condenser C2 maintain static; When moving plate rotates with rotating shaft 4, moving plate changes with the area generating period that overlaps of stator, and it is linear that its change curve is; The dielectric of described variable condenser is air;
One end of described capacitor Ca is electrically connected to the stator 41 of variable condenser C1, and its tie point is the output terminal of voltage signal A; One end of described capacitor Cb is electrically connected to the stator 42 of variable condenser C2, and its tie point is the output terminal of voltage signal B; The other end of capacitor Ca, Cb is connected, and its tie point is excitation power supply E input end S; The moving plate 31,32 of variable condenser C1, C2 is electrically connected to the ground end D of excitation power supply E;
It is characterized in that: described excitation power supply E is D.C. regulated power supply, described voltage follower A1, A2 consists of the operational amplifier of high input impedance, its inverting input is connected with output terminal, and its in-phase input end is connected with the output terminal of voltage signal A, B respectively.
Its beneficial effect is: the D.C. regulated power supply technology maturation of prior art, voltage regulation result is also fairly good, excitation power supply of the present invention is D.C. regulated power supply, the excitation power supply of the high frequency adopting with rotary transformer (7KHz) voltage is compared manufacturing cost and is greatly reduced (excitation power supply of rotary transformer must be high-frequency ac voltage), adopt D.C. regulated power supply can save the detecting circuit of rear class simultaneously, demodulator circuit, adopt in addition D.C. regulated power supply can not produce the high-frequency signal noise of being brought by power supply itself, the angular signal detecting is not subject to the effect of parasitic capacitance of transfer wire in transmitting procedure yet, therefore there is stronger interference free performance.
For adapt to detecting the corner of High Rotation Speed object, this corner measuring apparatus also comprises a bleeder circuit 2, and described bleeder circuit is by resistance R 1, R2, R3, potentiometer RW, and stabilivolt DW, capacitor C 3, triode T1 form; Resistance R 1 is connected with stabilivolt DW; Potentiometer RW connects with resistance R 3; The cursor slide end of potentiometer RW is connected with the base stage of triode T1 by resistance R 2, and the emitter of triode T1 is received the tie point of resistance R 1 and stabilivolt DW; The collector of one end of one end of resistance R 1, potentiometer RW and triode T1 meets excitation power supply E input end S; One end of the anode of stabilivolt DW, resistance R 3 is received and is held D; The positive pole of capacitor C 3 meets excitation power supply E input end S, and the negative pole of capacitor C 3 is received and held D.
For better compensate for ambient temperature, humidity change the impact on angular signal, capacitor Ca, Cb, be air dielectric capacitor.
Use for convenience and prevent electromagnetic interference (EMI), described rotary angle transmitter 1, voltage follower A1, A2, bleeder circuit 2, be arranged in a metal shell 3.The output lead of the input lead of the input lead of excitation power supply E, amplifier power supply, voltage follower A1, A2 is drawn in housing 3.
The invention has the beneficial effects as follows: 1, the structure of sensor adopts metal material to manufacture realization, therefore can in rugged environment, use good reliability, long service life; 2, the electric circuit form that sensor forms is capacitor and variable condenser series circuit, the signal of its output forms through capacity cell dividing potential drop, the dielectric of capacitor and variable condenser is air, so the voltage signal of sensor output is not subject to the impact of environment temperature, humidity variation; 3, this sensor output corner signal is voltage signal, and amplitude that can transient measurement voltage signal is determined the angle of corner, and the sampling period of existing analog to digital conversion electronic module can be below 50ns, so this sensor can detect the corner that High Rotation Speed object is high; 4, institute's use sensor low cost of manufacture; Stable with the electronic component performance of the supporting measurement mechanism of rotary angle transmitter, price is lower, so corner measuring apparatus manufacturing cost is corresponding also low.
Accompanying drawing explanation
Fig. 1 is outer corner measurement circuit theory diagrams of the present invention.
Fig. 2 is sensor construction schematic diagram of the present invention.
Fig. 3 is capacitance and the angle relation curve map of variable condenser.
Embodiment
Now contrast the constitution and principle that accompanying drawing illustrates outer corner measurement circuit of the present invention.
Outer corner measurement circuit shown in Fig. 1 comprises:
The excitation power supply E of pumping signal is provided to rotary angle transmitter 1, and excitation power supply E is D.C. regulated power supply;
Corner is converted to the rotary angle transmitter 1 of corner voltage signal, rotary angle transmitter 1 consists of capacitance variable variable condenser C1, C2 and fixing capacitor Ca, the Cb of capacitance; One end of described capacitor Ca is electrically connected to the stator 32 of variable condenser C1, and its tie point is the output terminal of voltage signal A; One end of described capacitor Cb is electrically connected to the stator 42 of variable condenser C2, and its tie point is voltage signal B output terminal; The other end of capacitor Ca, Cb is connected, and its tie point is excitation power supply E input end S; The moving plate 31,32 of variable condenser C1, C2 is electrically connected to the ground end D of excitation power supply E;
Voltage signal A, B deliver to respectively voltage follower A1, A2, and voltage follower A1, A2 consist of the operational amplifier of high input impedance, and its inverting input is connected with output terminal, and its in-phase input end is connected with the output terminal of voltage signal A, B respectively.The in-phase input end of operational amplifier has high input impedance, does not absorb the electric current of voltage signal A, B, can guarantee that the voltage signal detecting is undistorted; The inverting input of operational amplifier is connected with output terminal, can make that the output impedance of operational amplifier is low has stronger carrying load ability and an anti-electromagnetic interference capability.
The voltage signal of voltage follower A1, A2 output is delivered to respectively the input end of analog to digital converter M1, M2, and analog to digital converter M1, M2 convert the voltage signal of voltage follower A1, A2 output to digital signal; The digital signal of this analog to digital converter M1, M2 output is delivered to data processor and is carried out the value that calculation process draws corner, for the occasion needing, described analog to digital converter should have high analog to digital conversion speed, and described data processor is single-chip microcomputer or digital signal processor (DSP).
Amplifier power supply provides stable working power to voltage follower A1, A2, output positive voltage V+ and negative voltage V-.
Its measuring principle is:
The moving plate 31,32 of described variable condenser C1, C2 is arranged in a rotating shaft 4, and rotating shaft 4 is connected with tested rotating object, moving plate 31,32 and rotating shaft 4 synchronous rotaries; The stator 41 of variable condenser C1 and the stator 42 of variable condenser C2 maintain static; When moving plate rotates with rotating shaft 4, it is that its electric capacity generating period changes that moving plate changes with the area generating period that overlaps of stator, and it is linear that its change curve is; The dielectric of described variable condenser is air;
The capacitance variations scope of variable condenser C1, C2 is identical, and the electric capacity of capacitor Ca, Cb equates.
It is known according to Fig. 1,
Ua／U1＝C1f／Caf （1）；
In formula 1, U1 is that the upper voltage (voltage signal A) of variable condenser C1, Ua are that the upper voltage of capacitor Ca, C1f are that electric capacity, the Caf of variable condenser C1 is the electric capacity of capacitor Ca;
Ua＝Ue－U1 （2）；
In formula 2, Ue is the voltage of pumping signal E;
To in formula 2 substitution formulas 1, have,
（Ue－U1）／U1＝C1f／Caf （3）；
Arrangement formula 3 has,
C1f＝Caf×（Ue－U1）／U1 （4）；
In formula 4, the numerical value of Ue and Ca can preset, and the numerical value of U1 can learn by measurement, as long as measure the numerical value of U1, carries out computing just can obtain the capacitor C 1f of variable condenser C1 by formula 4.
The expression formula of capacitor C 2f that in like manner can draw variable condenser C2 is as follows,
C2f＝Cbf×（Ue－U2）／U2 （5）
In formula 5, C2f is that electric capacity, the Cbf of variable condenser C2 are the electric capacity of capacitor Cb; U2 is that the numerical value of variable condenser C2 upper voltage (voltage signal B), Ue and Cbf can preset, and U2 can learn by measurement.
Fig. 3 is the curve map that capacitor C 1f, the C2f of variable condenser C1, C2 changes with corner, by overlapping between the moving plate of variable condenser C1, C2 and stator, area is designed to fan-shaped, can make the linear relationship that is varied to of its coincidence area and corner, its electric capacity also with the linear relationship that is varied to of corner.
As can be seen from Figure 3, capacitor C 1f and the relation between rotational angle theta of variable condenser C1 can be expressed as,
θ＝k C1f (0°≦θ﹤180°) (6)
θ＝360°－k C1f (180°≦θ﹤360°) (7)
In formula 6,7, k is coefficient of angularity, is a constant, under angle value θ and the known condition of capacitance C1f, can obtain coefficient of angularity k.
Rotational angle theta is within the scope of 0-360 °, corresponding two the different corners of same numerical value of capacitor C f1, for distinguishing the corresponding corner of capacitor C 1f, the moving plate of variable condenser C1 31 is arranged to different with the angle between stator 42 with the moving plate 32 of variable condenser C2 from the angle between stator 41, under same corner, capacitor C 1f and capacitor C 2f can not be maximal value simultaneously, can distinguish the corresponding corner of capacitor C 1f like this with reference to capacitor C 2f.90 ° of corners when maximal value appears in the electric capacity that corner when maximal value appears in the electric capacity of variable condenser C2 in the present embodiment lags behind variable condenser C1.
If the variation range of capacitor C 1f, C2f is 0 to 200PF, according to Fig. 3, analysis is learnt:
When capacitor C 2f ﹤ 100PF, capacitor C 1f ﹤ 100PF,
Corner angle θ=k C1f;
When 0≤capacitor C 2f ﹤ 100PF, capacitor C 1f≤100PF,
Corner angle θ=k C1f;
When capacitor C 2f≤100PF, capacitor C 1f≤200PF,
Corner angle θ=360 °-k C1f.
In data processor, be provided with the program of calculating corner angle θ according to voltage U e, U1, U2 and capacitor C af, Cbf, its operating procedure is:
The first step, according to formula 4,
C1f=Caf * (Ue-U1)/U1, calculates capacitor C 1f;
Second step, according to formula 5,
C2f=Cbf * (Ue-U2)/U2, calculates capacitor C 2f;
The 3rd step, according to capacitor C 1f, capacitor C 2f, the quadrant at judgement corner angle θ place;
The 4th step, according to formula 6, formula 7,
θ＝k C1f (0°≦θ﹤180°)；
θ=360 °-k C1f (360 ° of 180 °≤θ ﹤); Calculate corner angle θ.
When detecting the corner of rotating object, the coincidence area of variable condenser C1, C2 is that its electric capacity changes with corner, when the electric capacity of variable condenser from large to small time the voltage on variable condenser can be uprised by low, and the electric capacity of capacitor Ca, Cb can not change its voltage, can not suddenly change, the series voltage of the series voltage of variable condenser C1 and capacitor Ca or variable condenser C2 and capacitor Cb will be higher than the voltage U e of excitation power supply E like this; The electric current of the D.C. regulated power supply of prior art (being excitation power supply E) is unidirectional output, the function without Absorption Current, in the situation that the rotating speed of rotating object lower (extreme case be that per minute is tens of turn), filter capacitor (being equivalent to capacitor C 3 in Fig. 1) by the parallel connection of D.C. regulated power supply output terminal carrys out Absorption Current, keeps the stable of output voltage; But when detecting the corner of High Rotation Speed object (extreme case be that per minute is up to ten thousand turn), the very fast described filter capacitor of curent change producing due to the series voltage of variable condenser C1 and capacitor Ca can not absorb this electric current immediately, make the output end voltage value of D.C. regulated power supply still be greater than Ue, this situation should be avoided.
For adapt to detecting the corner of High Rotation Speed object, this corner measuring apparatus is provided with a bleeder circuit 2, and described bleeder circuit is by resistance R 1, R2, R3, potentiometer RW, and stabilivolt DW, capacitor C 3, triode T1 form; Resistance R 1 is connected with stabilivolt DW; Potentiometer RW connects with resistance R 3; The cursor slide end of potentiometer RW is connected with the base stage of triode T1 by resistance R 2, and the emitter of triode T1 is received the tie point of resistance R 1 and stabilivolt DW; The collector of one end of one end of resistance R 1, potentiometer RW and triode T1 meets excitation power supply E input end S; One end of the anode of stabilivolt DW, resistance R 3 is received and is held D; The positive pole of capacitor C 3 meets excitation power supply E input end S, and the negative pole of capacitor C 3 is received and held D.When the series voltage of variable condenser C1 and capacitor Ca or the series voltage of variable condenser C2 and capacitor Cb are greater than the voltage U e of excitation power supply E, the voltage of the cursor slide end of potentiometer RW raises and voltage on stabilivolt DW is constant, the base current of triode T1 is raise, the Absorption Current thereby its collector current raises greatly, makes the voltage U e of excitation power supply E keep stable; When the electric capacity of variable condenser C1, C2 changes from small to big, excitation power supply E has enough electric current fan-out capabilities, can keep the voltage U e of excitation power supply E constant; Guaranteed roll angle inspection precision.
For compensate for ambient temperature, humidity change the impact on angular signal, capacitor Ca, Cb, be preferably air dielectric capacitor.Compensation principle is as follows:
Known according to Fig. 1, the expression formula of the voltage U 1 on variable condenser C1 is:
U1＝Ue×(1/C1f) ÷[(1/Caf)＋(1/C1f)]；
The expression formula of the voltage U 2 on variable condenser C2 is:
U2＝Ue×(1/C2f) ÷[(1/Cbf)＋(1/C2f)]；
Due to capacitor Ca, Cb, the dielectric of variable condenser C1, C2 is air, when temperature, the humidity of air change, the DIELECTRIC CONSTANT ε of air can change, the proportional relation of DIELECTRIC CONSTANT ε of capacitor C af, Cbf, C1f, C2f and air, from the expression formula of voltage U 1, U2, can find out that DIELECTRIC CONSTANT ε can be eliminated by division arithmetic, make the formation of voltage U 1, U2 not be subject to temperature, humidity to send out the impact of variation.
Use for convenience and prevent electromagnetic interference (EMI), described rotary angle transmitter 1, voltage follower A1, A2, bleeder circuit 2, be arranged in a metal shell 3.The output lead of the input lead of the input lead of excitation power supply E, amplifier power supply, voltage follower A1, A2 is drawn in housing 3.Now contrast Fig. 2 its structure is described.
The end cap 5 of metal material is equipped with at shell 3 its two ends of the sleeve-shaped of being made by metal material, and bearing 7 is equipped with at the position, the center of circle of end cap 5, and the rotating shaft 4 of moving plate 31,32 that variable condenser C1, variable condenser C2 are installed is protruding from bearing 7;
The stator 41 of the variable condenser C1 of rotary angle transmitter 1 and the stator 42 of variable condenser C2 are arranged on respectively on stator axle 6, and stator axle 6 is fastened on end cap 5 and with end cap 5 without electrically contacting (insulation).
Identical being symmetricly set on locating shaft 6 of structure of capacitor Ca, the Cb of rotary angle transmitter 1, the capacitor Ca of take illustrates its structure as example, right-hand member flange place at the locating shaft 6 of variable condenser C1 arranges a pole plate 8, pole plate 8 is by electrode plate insulation lining 65, electrode plate insulation packing ring 66 and locating shaft 6 insulation, and pole plate 8 forms capacitor Ca with adjacent stator 41; Pole plate 8 is as excitation power supply E input end S, the stator axle of variable condenser C1 is as the output terminal of voltage signal A, the stator axle of variable condenser C2 is as the output terminal of voltage signal B, rotating shaft 4 is with end cap 5 for electrically contacting, and end cap 5 is as the electric connection point of the moving plate 31,32 of variable condenser C1, C2 and the ground end D of excitation power supply E.
Described voltage follower A1, A2, the electronic component of bleeder circuit 2 are assembled on wiring board 9, and wiring board 9 is arranged on locating shaft 6, are positioned at the outside of capacitor Cb pole plate 8.The output lead of the input lead of the input lead of excitation power supply E, amplifier power supply, voltage follower A1, A2 is drawn from wiring board 9 by fairlead 91.
This corner measuring apparatus adopts said structure, can not disturbed by external electromagnetic signal rotary angle transmitter 1, voltage follower A1, A2, bleeder circuit 2 shieldings; Issuable electromagnetic coupled undesired signal on the very low absorbable guide line of internal resistance output impedance very little, voltage follower A1, A2 of excitation power supply E and amplifier power supply, therefore the analog to digital converter of this corner measuring apparatus rear class, data processor part can be separated with rotary angle transmitter 1, voltage follower A1, A2, bleeder circuit 2 parts of prime, be arranged on the good position of environment and avoid electromagnetic interference (EMI).Rotary angle transmitter 1, voltage follower A1, A2, bleeder circuit 2 concentrated settings in the enclosure, make compact conformation in addition, and lead-in wire is few easy to use.
Claims (5)
1. a corner measuring apparatus, comprise the excitation power supply E that pumping signal is provided to rotary angle transmitter (1), rotary angle transmitter (1) converts corner to voltage signal A, B, and it consists of capacitance variable variable condenser C1, C2 and fixing capacitor Ca, the Cb of capacitance;
Comprise the voltage follower A1, the A2 that voltage signal A, B are carried out to impedance transformation, the voltage signal of voltage follower A1, A2 output is converted to analog to digital converter M1, the M2 of digital signal, digital signal is carried out to the data processor of calculation process; And provide the amplifier power supply of working power for voltage follower;
It is upper that the moving plate of described variable condenser C1, C2 (31,32) is arranged on a rotating shaft (4), and rotating shaft (4) is connected with tested rotating object, moving plate (31,32) and rotating shaft (4) synchronous rotary; The stator (42) of the stator of variable condenser C1 (41) and variable condenser C2 maintains static; When moving plate rotates with rotating shaft (4), moving plate changes with the area generating period that overlaps of stator, and it is linear that its change curve is; The dielectric of described variable condenser is air;
One end of described capacitor Ca is electrically connected to the stator (41) of variable condenser C1, and its tie point is the output terminal of voltage signal A; One end of described capacitor Cb is electrically connected to the stator (42) of variable condenser C2, and its tie point is the output terminal of voltage signal B; The other end of capacitor Ca, Cb is connected, and its tie point is excitation power supply E input end S; The moving plate of variable condenser C1, C2 (31,32) is electrically connected to the ground end D of excitation power supply E;
It is characterized in that: described excitation power supply E is D.C. regulated power supply, described voltage follower A1, A2 consists of the operational amplifier of high input impedance, its inverting input is connected with output terminal, and its in-phase input end is connected with the output terminal of voltage signal A, B respectively.
2. corner measuring apparatus according to claim 1, is characterized in that this corner measuring apparatus also comprises a bleeder circuit (2), and described bleeder circuit is by resistance R 1, R2, R3, potentiometer RW, and stabilivolt DW, capacitor C 3, triode T1 form; Resistance R 1 is connected with stabilivolt DW; Potentiometer RW connects with resistance R 3; The cursor slide end of potentiometer RW is connected with the base stage of triode T1 by resistance R 2, and the emitter of triode T1 is received the tie point of resistance R 1 and stabilivolt DW; The collector of one end of one end of resistance R 1, potentiometer RW and triode T1 meets excitation power supply E input end S; One end of the anode of stabilivolt DW, resistance R 3 is received and is held D; The positive pole of capacitor C 3 meets excitation power supply E input end S, and the negative pole of capacitor C 3 is received and held D.
3. corner measuring apparatus according to claim 1 and 2, is characterized in that described capacitor Ca, Cb, is air dielectric capacitor.
4. corner measuring apparatus according to claim 2, it is characterized in that described rotary angle transmitter (1), voltage follower A1, A2, bleeder circuit (2), be arranged in a shell (3), the input lead of the input lead of excitation power supply E, amplifier power supply, the output lead of voltage follower A1, A2 are drawn in shell (3).
5. corner measuring apparatus according to claim 4, the end cap (5) of metal material is equipped with at its two ends of shell (3) described in it is characterized in that, bearing (7) is equipped with at the position, the center of circle of end cap (5), and the rotating shaft (4) that the variable condenser C1 of rotary angle transmitter (1), the moving plate of variable condenser C2 (31,32) are installed is protruding from bearing (7);
It is upper that the stator (42) of the stator of variable condenser C1 (41) and variable condenser C2 is arranged on respectively stator axle (6), and stator axle (6) is fastened on end cap (5) above and electrically contacts with end cap (5) nothing;
The capacitor Ca of rotary angle transmitter (1) is such formation, right-hand member flange place at the locating shaft (6) of variable condenser C1 arranges a pole plate (8), pole plate (8) is by electrode plate insulation lining (65), electrode plate insulation packing ring (66) and locating shaft (6) insulation, and pole plate (8) forms capacitor Ca with adjacent stator (41); The capacitor Cb of rotary angle transmitter (1) is identical with capacitor Ca structure, is symmetricly set on locating shaft (6); Pole plate (8) is as excitation power supply E input end S, the stator axle of variable condenser C1 is as the output terminal of voltage signal A, the stator axle of variable condenser C2 is as the output terminal of voltage signal B, rotating shaft (4) is with end cap (5) for electrically contacting, and end cap (5) is as the electric connection point of the moving plate (31,32) of variable condenser C1, C2 and the ground end D of excitation power supply E;
It is upper that the electronic component of described voltage follower A1, A2, bleeder circuit (2) is assembled in wiring board (9), and it is upper that wiring board 9 is arranged on locating shaft (6), is positioned at the outside of capacitor Cb pole plate (8).
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| CN201210288155.0A CN102818518B (en) | 2012-08-15 | 2012-08-15 | Rotary-angle measuring device |
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| CN201210288155.0A CN102818518B (en) | 2012-08-15 | 2012-08-15 | Rotary-angle measuring device |
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| CN102818518B true CN102818518B (en) | 2014-09-03 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1463889A (en) * | 2002-06-10 | 2003-12-31 | 中国科学院声学研究所 | Distance variable condenser type analog modulation output type angular displacement sensor |
| CN2881649Y (en) * | 2005-09-30 | 2007-03-21 | 中北大学 | Micro-mechanical angle acceleration sensor |
| US7436203B1 (en) * | 2007-04-18 | 2008-10-14 | National Semiconductor Corporation | On-chip transformer arrangement |
| CN202692936U (en) * | 2012-08-15 | 2013-01-23 | 高玉琴 | Rotation angle measuring device |
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2012
- 2012-08-15 CN CN201210288155.0A patent/CN102818518B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1463889A (en) * | 2002-06-10 | 2003-12-31 | 中国科学院声学研究所 | Distance variable condenser type analog modulation output type angular displacement sensor |
| CN2881649Y (en) * | 2005-09-30 | 2007-03-21 | 中北大学 | Micro-mechanical angle acceleration sensor |
| US7436203B1 (en) * | 2007-04-18 | 2008-10-14 | National Semiconductor Corporation | On-chip transformer arrangement |
| CN202692936U (en) * | 2012-08-15 | 2013-01-23 | 高玉琴 | Rotation angle measuring device |
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