CN206399999U - Can wireless, passive, noncontact, the device of multi-thread measurement DC current - Google Patents
Can wireless, passive, noncontact, the device of multi-thread measurement DC current Download PDFInfo
- Publication number
- CN206399999U CN206399999U CN201720043993.XU CN201720043993U CN206399999U CN 206399999 U CN206399999 U CN 206399999U CN 201720043993 U CN201720043993 U CN 201720043993U CN 206399999 U CN206399999 U CN 206399999U
- Authority
- CN
- China
- Prior art keywords
- fixture block
- type fixture
- sensor
- current
- fixed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The utility model be related to it is a kind of can wireless, passive, noncontact, the device and method of multi-thread measurement DC current, belong to fields of measurement.Fixed V-type fixture block bottom is fixedly connected with being oriented to feed rod one end, a pair of linear bearings are installed inside movable V-type fixture block, linear bearing is fixed in movable V-type fixture block by circlip for shaft, linear bearing is moved along feed rod progress low friction is oriented to, tensioner spring is inserted in guiding feed rod and is clipped between adjusting nut and movable V-type fixture block, adjusting nut is connected with being oriented to polished rod threaded one end, linear electric motors are fixedly connected by linear electric motors support base with fixed V-type fixture block, sensor assembly is positioned in sensor adjustment platform, tapped through hole is arranged at sensor adjustment platform bottom, the screw mandrel of linear electric motors is rotated with the tapped through hole inside adjustment platform and is connected.The utility model can realize wireless, passive, noncontact, multi-thread measurement, with small volume, it is simple in construction, have a wide range of application the features such as.
Description
Technical field
The utility model belongs to fields of measurement, is related to achievable wireless, passive, noncontact, multi-thread measurement DC current prison
Survey device and method.
Background technology
Along with scientific and technical fast-developing, electronic equipment, to be equipped in human society links performer irreplaceable
Effect, such as：Current electric automobile is fast-developing towards electrically actuatable direction, to the topmost part motor of electric automobile,
The closed-loop control of electrokinetic cell is realized by current detecting.And for example using wind energy, solar energy as representative clean energy resource of new generation
The electric energy of generation, accurately, is quickly incorporated in intelligent grid by the development of technology by the detection to electric current, therefore to electric current
Monitoring turn into and ensure product safety, the important guarantee that normally runs.Being currently available for the sensor main of monitoring current will include
Several classes below：Hall sensor is a kind of magnetic field sensor according to Hall effect.Hall current sensor is by semiconductor
What material was made, because of situations such as element material, spurious dc electromotive force, equipotential electromotive force, external electromagnetic wave interference can not
The measuring accuracy of hall sensor is had influence on, while being needed in measurement process because principle limitation can only measure a wire
Take packaged wire apart measurement, strong influence system safety increases measurement complexity.Mutual inductance type electric current is passed
Sensor enters in measuring circuit the measurement realized to electric current according to transformer principle by iron core and windings in series, but such is sensed
Device causes measurement inaccurate because its magnetic flux saturation is easily distorted measurement, while magnetic flux saturation, increases core loss, produces
High heat, which damages insulation, causes safety problem.Shunting sensor main will be according to ohm principle by connecting into the small resistor of circuit one
Survey both end voltage and realize current measurement, but direct current parameter can only be measured, seriously limit its application.Based on principles above, if
Wireless measurement is realized, wireless transmitter module, power module need to be added, complexity, the cost of current sensor is considerably increased.
The content of the invention
The utility model offer is a kind of can wireless, passive, noncontact, the device and method of multi-thread measurement DC current.
The utility model is adopted the technical scheme that：Fixed V-type fixture block bottom is fixedly connected with being oriented to feed rod one end, movably
A pair of linear bearings are installed inside V-type fixture block, linear bearing is fixed in movable V-type fixture block by circlip for shaft,
Linear bearing is moved along feed rod progress low friction is oriented to, and tensioner spring is inserted in guiding feed rod and is clipped in adjusting nut and movable V
Between type fixture block, adjusting nut is connected with being oriented to polished rod threaded one end, and linear electric motors pass through linear electric motors support base and fixed V-type
Fixture block is fixedly connected, and sensor assembly is positioned in sensor adjustment platform, and fixed V-type fixture block, which includes, can make sensor adjust platform
Tapped through hole is arranged at the through hole passed through, sensor adjustment platform bottom, and screw mandrel and the tapped through hole inside adjustment platform of linear electric motors turn
Dynamic connection.
The structure of sensor assembly described in the utility model is：Piezoelectric cantilever one end connects firmly with support substrate, another
End surfaces bonding magnetic sensing unit, light in the middle part of one layer of interdigital electrode, cantilever beam is deposited in piezoelectric cantilever surface fixing end side
One layer of reflecting grating is carved, addressing antenna, echo antenna are connected with interdigital electrode busbar respectively, radio receiving transmitting module is to addressing antenna
The wireless signal of emission sensor design frequency, and it is received back to the wireless communication that the change of wave antenna feedback current causes frequency to change
Number, time addressing antenna, echo antenna are Nian Jie with support substrate respectively, and support substrate is Nian Jie with underlying support structure, lower layer support
Structure is Nian Jie with upper strata sheets of glass.
The beneficial effects of the utility model：
1st, the utility model is not directly connected to wire, by magnet sensor wire magnetic field, and then realizes contactless survey
Amount, reduces installing/dismounting complex operation degree；
2nd, the sensor such as Hall pattern can only measure the wire of single battery core, it is therefore desirable to cut off and lead due to principle limitation
Line outer jacket, destroys conductor structure, adds the measurement complexity of sensor, and the utility model is not destroying shield outside wire
On the premise of layer, it is fixed on outer jacket surface by positioning clamp module by sensor, realizes comprising two to multiple conducting wires electricity
The measurement of stream；
3rd, the utility model is wirelessly transmitted, and without arranging that signal wire reduces cost, improves system reliability,
It can be applied to multiple node monitorings；
4th, the utility model internal need not be implanted into power supply, and battery is changed for it without the tested electric equipment of dismounting.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model；
Fig. 2 is front view of the present utility model；
Fig. 3 is the axonometric drawing without encapsulating structure of the utility model sensor assembly；
Fig. 4 is the axonometric drawing of the utility model sensor assembly；
Fig. 5 is the sectional view that the utility model sensor assembly adjusts platform with sensor；
Fig. 6 is two wire magnetic fields gradient distribution maps of the utility model；
Fig. 7 is the utility model sensor assembly location diagram；
Fig. 8 is the utility model step current lower sensor output response curve；
Fig. 9 is the utility model slope current lower sensor output response curve；
Wherein：Movable V-type fixture block 1, fixed V-type fixture block 2, sensor assembly 3, magnet 301, piezoelectric cantilever 302, support
Pedestal 303, addressing antenna 304, echo antenna 305, interdigital electrode 306, reflecting grating 307, radio receiving transmitting module 308, sensor
Adjust platform 4, linear electric motors support base 5, linear electric motors 6, guiding polished rod 7, linear bearing 8, circlip for shaft 9, tensioner spring
10th, adjusting nut 11, two-wire system electric lead 12, tested electric lead outer jacket 1201；Tested electric lead battery core 1, tested electricity
Wire battery core 2 1203.
Embodiment
The fixed bottom of V-type fixture block 2 is fixedly connected with guiding feed rod 7 one end, be provided with inside movable V-type fixture block 1 a pair it is straight
Bobbin holds 8, and linear bearing 8 is fixed in movable V-type fixture block 1 by circlip for shaft 9, linear bearing 8 along be oriented to light
Thick stick 7 carries out low friction movement, and tensioner spring 10 is inserted in guiding feed rod 7 and is clipped between adjusting nut 11 and movable V-type fixture block 1,
Adjusting nut 11 is connected with being oriented to the threaded one end of polished rod 7, and tensioner spring 10 promotes movable V-type fixture block 1 and fixed 2 pairs of V-type fixture block
Electric lead 12 comprising two battery cores, which is realized, to be clamped, and linear electric motors 6 are fixed by linear electric motors support base 5 with fixed V-type fixture block 2
Connection, sensor assembly 3 is positioned in sensor adjustment platform 4, and fixed V-type fixture block 2, which includes, can pass through sensor adjustment platform 4
Through hole, tapped through hole, screw mandrel and the tapped through hole rotation inside adjustment platform 4 of linear electric motors 6 are arranged at sensor adjustment platform 4 bottom
Connection, to realize that sensor assembly 3 and the adjustment of the position of electric lead 12 are positioned.
Sensor assembly 3 described in the utility model includes magnet 301, piezoelectric cantilever 302, support substrate 303, addressing
Antenna 304, echo antenna 305, interdigital electrode 306, reflecting grating 307, radio receiving transmitting module 308, wherein：Piezoelectric cantilever 302
One end is connected firmly with support substrate 303, another end surfaces bonding magnetic sensing unit 301, in the surface fixing end one of piezoelectric cantilever 302
Side deposits one layer of reflecting grating 307 of photoetching in the middle part of one layer of interdigital electrode 306, cantilever beam, and addressing antenna 304, echo antenna 305 are distinguished
It is connected with the busbar of interdigital electrode 306, radio receiving transmitting module 308 is wireless to the addressing emission sensor design frequency of antenna 304
Signal, and the wireless signal that the change of the feedback current of wave antenna 305 causes frequency to change is received back to, return addressing antenna 304, echo day
Line 305 is be bonded with support substrate 303 respectively, and support substrate 303 is be bonded with underlying support structure 310, underlying support structure 310 with
Upper strata sheets of glass 309 is bonded, and prevents that internal measurement element from being influenceed by external environment.
Using measuring method of the present utility model, comprise the following steps：
Movable V-type fixture block 1 is pushed open and reserves clamp distance by step (1) towards the opposite direction of fixed V-type fixture block 2,
Clamp distance is greater than conductance linear diameter；
Tested electric lead 12 is positioned over fixed V-type fixture block 2, at the V shaped hole of movable V-type fixture block 1 by step (2), and release can
Dynamic V-type fixture block 1, the tensioner spring 10 in compressive state promotes movable V-type fixture block 1 to be moved along feed rod is oriented to, with fixed V-type
Fixture block is by conductor clamping；
Tested electric lead is accessed standard DC current I by step (3)0；
Step (4) drives sensor to adjust platform 4 and moved by linear electric motors 6, when sensor obtains maximum output frequency,
It can determine that, necessarily deposited when sensor assembly passes through opposite side by wire side by the double battery core magnetic field gradient center maximums of wire
In a crest, as anchor point and fixed sensor assembly 3；
Tested electric lead is passed through tested electric current I and carries out actual measurement by step (5), and tested current value I can pass through sensor
Module output frequency changes delta f and sensor parameter value K is obtained, and formula is as follows
Wherein：zmFor magnet 301 and the center coordinate of electric lead 12, x1,x2It is surface acoustic wave interdigital electrode 306 in coordinate
Coordinate under system, a is the single battery core 1 of tested electric lead, the radius of single battery core 2 1203, BrFor magnet remanence flux,
rx、rzIt is Poisson's ratio, f for the piezoelectric coefficient of strain, μ0It is piezoelectric cantilever cantilever thickness for the centre frequency of interdigital electrode 306, h
302、IyFor the moment of inertia of piezoelectric cantilever 302, E is that the modulus of elasticity of piezoelectric cantilever 302, V are magnet volume.
Above current sensor model machine measurement frequency Δ f and current relationship are as follows：
Tested current value can be tried to achieve by the following method：
The current sensor induced magnet is arranged in the neighbouring position of double joint wire 12 or center in measurement process, obtained
Wire nearby magnetic field force or the magnetic field force of center are obtained, drives cantilever beam to deform by magnetic field force, and then change cantilever beam sound table
Face wave frequency rate, detected current value
Magnetic field gradient, magnetic field force size, wire optional position or center magnetic field gradient are can obtain according to below equation.Such as
When sensor-magnet is in center, magnetic field gradient is maximum shown in Fig. 6, and transducer sensitivity is maximum, double joint Distribution of Magnetic Field and
Gradient distribution is as follows：
Magnetic field intensity formula around solid conductor
Left lead magnetic field intensity is
Right side wire magnetic fields intensity is
Left lead magnetic field intensity is in z-axis durection component
Right side wire magnetic fields intensity is in z-axis durection component
Two wires are strong in the resultant magnetic field in z-axis direction
Wherein：X, z are any point coordinate in the coordinate system set up with double joint wire center, and a is single battery core radius, I
To be tested current in wire.
Resultant magnetic field derivation to left side, right side battery core in z-axis direction magnetic field intensity and z-axis direction can obtain corresponding magnetic field
Gradient magnetic power formula is as follows：
Left lead is in z-axis direction magnetic field gradient
Right side wire is in z-axis direction magnetic field gradient
Two wires are superimposed magnetic field gradient in z-axis direction
Magnet is in magnetic field stress
Magnet is in two magnetic field superposition situation lower stress
Magnet is in two center magnetic field superposition situation lower stress
Wherein BrIt is magnet volume, F for permanent magnet remanence flux, VzFor optional position magnetic field force general formula, Fz(0,
Z) it is magnetic field force at two battery core center z locations；
Double joint battery core, magnet, piezoelectric cantilever, interdigital electrode coordinate position relation are illustrated in figure 7, under magnetic field force effect
The strain stress relation of cantilever beam upper surface is as follows, the frequency that can be changed based on strain stress relation；
It is as follows that cantilever beam strains formula along the x-axis direction：
Z-axis direction is strained：
The mean strain formula of x-axis direction interdigital electrode is
The mean strain of x-axis direction interdigital electrode is
It is ε that z-axis direction, which is strained with x-axis direction strain stress relation,sz=-μ εsx
Z-axis direction is strained
Wherein εxStrained for cantilever beam length direction x-axis direction, εzStrained for cantilever beam z-axis direction optional position, εsxFor
Interdigital electrode resonance portion length direction is strained, εszFor interdigital electrode resonance portion thickness strain, x1,x2It is resonance portion in length
Direction coordinate is spent, h is cantilever cantilever thickness, and F is the electromagnetic force between current field and cantilever beam magnetic field, and μ is Poisson's ratio, IzFor cantilever
Beam the moment of inertia, E is cantilever beam modulus of elasticity；
The described cantilever beam surface applied to current sensor first deposits layer of metal, is being obtained by way of photoetching
Required metal interdigital electrode；
Frequency shift (FS) magnitude relation caused by cantilever beam strain is as follows caused by the magnetic field force that magnet is produced by electric current
It is as follows that velocity of wave produces strain stress relation with current field power
It is as follows that wavelength produces strain with current field power
Frequency and the strain that current field power is produced are as follows
Frequency shift (FS) caused by current electromagnetic power is as follows
It is simplified as △ f=f (ε)-f0=[(rx-1)εsx+rzεsz]f0
Rectangular cantilever beam is as follows in the effect lower frequency skew of double joint battery core wire：
In the magnetic field lower magnet stress of double joint battery core：
For
When electrical current is I, current sensor measurement frequency change is：
Wherein：xm,zmFor coordinate, x at magnet and wire center1,x2For seat of the surface acoustic wave resonance part under coordinate system
Mark, a is solid conductor radius, BrFor magnet remanence flux, rx、rzIt is Poisson's ratio, f for the piezoelectric coefficient of strain, μ0For fork
Refer to the centre frequency of electrode.
Above parameter is that known quantity simplification formula is as follows：△ f=KI
Wherein K distance parameters between cantilever beam structure and material parameter, wire and magnet are determined, are known quantity
When sensor is in double joint battery core center：xm=0
Therefore known coefficient K values and frequency change f are that can obtain current value size,
The described microstrip antenna applied to current sensor is tapped into by electric lead with being connected with interdigital electrode busbar
And changing the frequency of surface acoustic wave, the difference on the frequency △ f for measuring change can determine that tested electric current；
As shown in figure 8, measuring step form electric current using rectangular cantilever beam, rectangular magnet form, magnet is placed in double joint and led to
Electric lead center, step current produces half-sine pulse impact, and cantilever beam vibrates
Current sensor output frequency is
When step current input as shown in Figure 8 is in the ascent stage, cantilever beam is impacted by half-sine pulse, moves downward pair
The sensor answered is output as 1. frequency band；Reach that first bottom peak swing is output as 2. Frequency point；Step current reaches surely
During state value, cantilever beam is decayed by exponential form, and sensor is exported as shown in 3. frequency band, and equilibrium-like is decayed to rear suspension beam
State, sensor output such as 4. frequency band；When step current input is in descending branch, cantilever beam moves respective sensor output upwards
For 5. frequency band, the sensor for the peak swing that outreaches is output as 6. Frequency point.
] as shown in figure 9, measuring slope current using rectangular cantilever beam, rectangular magnet form, cantilever beam occurs unidirectional curved
Song, current sensor output frequency is：
Electric current as shown in Figure 8 is with certain slope by 0 positive rising, and electric current reaches maximum from 0, and electric current value changes are on 1.
Rise to and 2. arrive maximum 3., 2. 1. cantilever beam is dropped to least significant end 3. position, sensor frequency output by horizontal force position
1. risen to by fundamental frequency 2. until 3. Frequency point, when electric current is declined by positive maximum with certain slope, electric current by maximum to
0,5. 4. electric current value changes by maximum 3. to being dropped to, and 3. cantilever beam is risen to 4. to horizontal force by horizontal force position
5. position, when electric current is reversely risen with certain slope by 0, electric current reaches maximum from 0, electric current value changes by 5. rise to 6. to
7., 5. cantilever beam is risen to 6. to top 7. position maximum by horizontal force position, sensor frequency output by fundamental frequency 5.
Drop to 6. to 7. Frequency point, when electric current is declined by reverse maximum with certain slope, electric current value changes by 7. rise to 8. to
9., 8. 7. cantilever beam dropped to extremely minimum end position by topmost position, and 9., sensor frequency is exported by 7. rising to maximum
8. until 9. Frequency point.
Claims (2)
1. a kind of can wireless, passive, noncontact, the device of multi-thread measurement DC current, it is characterised in that：Under fixed V-type fixture block
Portion is fixedly connected with being oriented to feed rod one end, and a pair of linear bearings are provided with inside movable V-type fixture block, will by circlip for shaft
Linear bearing is fixed in movable V-type fixture block, and linear bearing is moved along feed rod progress low friction is oriented to, and tensioner spring, which is inserted in, leads
To feed rod and it is clipped between adjusting nut and movable V-type fixture block, adjusting nut is connected with being oriented to polished rod threaded one end, linear electric motors
It is fixedly connected by linear electric motors support base with fixed V-type fixture block, sensor assembly is positioned in sensor adjustment platform, fixed V
Type fixture block, which includes, can make sensor adjust the through hole that platform passes through, and tapped through hole is arranged at sensor adjustment platform bottom, linear electric motors
Screw mandrel is rotated with the tapped through hole inside adjustment platform and is connected.
2. it is according to claim 1 it is a kind of can wireless, passive, noncontact, the device of multi-thread measurement DC current, its feature
It is：The structure of the sensor assembly is：Piezoelectric cantilever one end is connected firmly with support substrate, another end surfaces bonding magnetic senses
Unit, one layer of reflecting grating of photoetching in the middle part of one layer of interdigital electrode, cantilever beam, addressing are deposited in piezoelectric cantilever surface fixing end side
Antenna, echo antenna are connected with interdigital electrode busbar respectively, and radio receiving transmitting module designs frequency to addressing antenna emission sensor
The wireless signal of rate, and the wireless signal that the change of wave antenna feedback current causes frequency to change is received back to, return addressing antenna, echo
Antenna is Nian Jie with support substrate respectively, and support substrate is Nian Jie with underlying support structure, underlying support structure and upper strata sheets of glass
Bonding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720043993.XU CN206399999U (en) | 2017-01-16 | 2017-01-16 | Can wireless, passive, noncontact, the device of multi-thread measurement DC current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720043993.XU CN206399999U (en) | 2017-01-16 | 2017-01-16 | Can wireless, passive, noncontact, the device of multi-thread measurement DC current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206399999U true CN206399999U (en) | 2017-08-11 |
Family
ID=59518315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720043993.XU Withdrawn - After Issue CN206399999U (en) | 2017-01-16 | 2017-01-16 | Can wireless, passive, noncontact, the device of multi-thread measurement DC current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206399999U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107453649A (en) * | 2017-08-17 | 2017-12-08 | 浙江师范大学 | A kind of vehicle-mounted energy accumulator of piezoelectric vibrator bend in one direction |
-
2017
- 2017-01-16 CN CN201720043993.XU patent/CN206399999U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107453649A (en) * | 2017-08-17 | 2017-12-08 | 浙江师范大学 | A kind of vehicle-mounted energy accumulator of piezoelectric vibrator bend in one direction |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106771498B (en) | Can wireless, passive, non-contact, the multi-thread device and method for measuring DC current | |
| CN101627311B (en) | High bandwidth open-loop current sensor | |
| CN105612404B (en) | Sensor with sensor element and the technique for manufacturing sensor element | |
| CN110333378B (en) | Magnetoelectric laminated material current sensing device based on magnetic convergence effect | |
| CN106018917B (en) | A kind of passive Current Voltage integrated sensor | |
| CN104101899B (en) | Multi-coil multi-terminal closed loop geophone accelerometer | |
| CN103439034B (en) | Multifunctional force cell sensor | |
| CN108414819B (en) | Piezoelectric passive current detection device and method for double-core wire | |
| CN104006909A (en) | Cable force detecting method and cable force sensor using same | |
| CN112327225A (en) | Magnetic field detection method based on magneto-dielectric effect, test device and working method thereof | |
| CN206399999U (en) | Can wireless, passive, noncontact, the device of multi-thread measurement DC current | |
| CN107765058A (en) | A kind of current measuring device and method towards three-phase four-wire system balanced load | |
| CN103176031A (en) | Rogowski-coil-based piezoelectric drive fiber Bragg grating current sensor and application method thereof | |
| CN101251409A (en) | Vibration sensor with InSb-NiSb magnet sensitive resistor | |
| CN101887106A (en) | Hall chip magnetic flux test device | |
| CN212229142U (en) | Two-dimensional magnetic characteristic measuring device and system under three-dimensional stress loading condition | |
| CN106123967B (en) | acceleration, amplitude detection system | |
| CN108152556B (en) | Passive excitation self-powered wireless non-contact current sensing measurement device and measurement method | |
| CN202057292U (en) | Piezoelectric current sensor | |
| CN110530501A (en) | Vibrating sensor | |
| CN106270283A (en) | A kind of forcing press punching press tonnage monitoring device | |
| CN103645447B (en) | Electrostrictive effect based fiber bragg grating magnetic field sensor and application method thereof | |
| CN202915880U (en) | Non-contact displacement sensor | |
| JP3401436B2 (en) | Magnetic field detection device | |
| CN207440158U (en) | A kind of current measuring device towards three-phase four-wire system balanced load |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170811 Effective date of abandoning: 20171110 |
|
| AV01 | Patent right actively abandoned |