CN109507475A - Wind power plant numerical indexes formula ammeter based on Zigbee WLAN - Google Patents
Wind power plant numerical indexes formula ammeter based on Zigbee WLAN Download PDFInfo
- Publication number
- CN109507475A CN109507475A CN201811577314.2A CN201811577314A CN109507475A CN 109507475 A CN109507475 A CN 109507475A CN 201811577314 A CN201811577314 A CN 201811577314A CN 109507475 A CN109507475 A CN 109507475A
- Authority
- CN
- China
- Prior art keywords
- stepper assemblies
- wind power
- power plant
- electric current
- preprocessing module
- 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.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
Abstract
Wind power plant numerical indexes formula ammeter based on Zigbee WLAN, it is characterized by: the present invention is by stepper assemblies, pointer, electric current preprocessing module and panel are encapsulated in by front frame, in the space that center and rear cover are surrounded, built-in electric current preprocessing module directly can convert stepping angle serial data required for numerical indexes driving assembly for current measurement value, amount of deflection needed for the serial data can be converted to drive indicators turn axis by built-in stepper assemblies, the current data currently indicated can also be uploaded to cloud data center by Zigbee WLAN by stepper assemblies simultaneously, its long working life, it is particularly suitable for distribution wind power plant, the inspection of the concentration of photovoltaic generating system and local Internet of Things, its unexpected effect is to have filled up the blank of networking pointer-type digital electronic ammeter , it is particularly suitable for the digitlization instruction of network instrument and high-end instrument, application prospect is quite wide.
Description
Technical field
The present invention relates to a wind power plant numerical indexes formula ammeter based on Zigbee WLAN, is mainly used in
Distributed wind power generation system, photovoltaic generating system, network digital instrument and field of industrial automation control.
Background technique
Convert wind energy into the distributed wind power generation system of electric energy, the method for operation mostly with user terminal generate power for their own use for
Main, remaining capacity online, and the power generating equipment being characterized in distribution network system balance adjustment or the energy synthesis for thering is electric power to export
Cascade utilization multiple-supplying facility.Distributed generation system usually requires that generated energy quality guarantee not less than 25 years, as attachment and inversion
Device is required to quality guarantee 5 years, and quality guarantee is protected by prolonging to 25 years again after expiring.
Ammeter is the real-time measurement instrument of distributed wind power generation system.Ammeter has indicator type current meter and LCD aobvious
Show table, LCD display small power consumption is radiationless, and shortcoming is that the core component of LCD display is by liquid crystal layer and upper and lower two
Piece polarizing film and backlight assembly composition, the main component of backlight assembly is two parts of backlight lamp tube and light guide plate, determines the longevity
In the service life of the mainly backlight lamp tube of life, reaching after a certain period of time, backlight lamp tube will appear aging naturally, and brightness is therewith
It reduces, is defined as lamp tube service life using the time when lighting tube brightness decays to 50%.The nominal service life of LCD is usually 2
It~3 ten thousand hours, if 24 hours one day are switched on, may only use 833~1250 days, only less than 3.5 years service life,
And in use, the brightness of LCD can gradually weaken.
It is all made of the milliampere gauge outfit or microampere gauge outfit of the driving of magneto-electric principle using conventional cursor formula DC ammeter, is commonly called as
Analog DC table.Tested electric current is after current divider, i.e., point gear generates Ampere force under current-carrying coil interaction
Square, after which overcomes the torsional moment of balance spring damped part, push pointer deflection, the size of torsional moment is by passing through gauge outfit line
The size of loop current determines that it is comprehensive that the deflection angle of pointer is particularly susceptible to material, environment temperature and humidity, manufacturing process etc.
The influence of conjunction factor.
In order to improve electromagnetical analogies pointer gauge it is inherent there is be afraid of low scarce of vibration, high failure rate, pointing accuracy
Point, present invention employs " the numerical indexes driving assembly based on a Zigbee WLAN " technology, which will
ZigBee and instrument are combined together with stepper motor technology, built-in instrument stepper motor ontology, PCB circuit board, ARM chip, micro-
Step pitch Multi-level microstep chip, wireless signal interface chip, signal router, coordinator, external 2.4GHz antenna can will measure
Rear serial data is translates directly into the current angle of numerical indexes by the collected information of Zigbee wireless transmission method
Displacement, to indicate the physical quantity of measured object.
It, will although ZigBee and instrument stepper motor natively belong to two irrelated technologies and product
It is the innovation greatly of the present invention one that a kind of numerical indexes driving assembly based on Zigbee WLAN, which is applied to DC ammeter, this
It is meant that basic measuring instrument for direct current device in addition to have the function of measure and indicate other than, can also by wireless networking,
The mode of routing uploads the current data of real-time measurement to control centre, and is the Zigbee WLAN voluntarily built,
Exempt from network fee.Especially the most important thing is, the driving cog in order to meet the requirement of ammeter long-lived operation, in instrument stepper motor
Wheel group uses wear-resisting nylon 66 material.
In addition to this, the electric current preprocessing module built in the present invention is a high performance mixed signal module, it guarantees
The electric current preprocessing module can directly convert current current measurement value to required for numerical indexes driving assembly
Stepping angle serial data, after which is sent in the numerical indexes driving assembly based on Zigbee WLAN, i.e.,
For amount of deflection needed for driving indicators turn axis, while the current data currently indicated being uploaded by Zigbee WLAN
To cloud data center.
Summary of the invention
Accordingly, the present invention is off the beaten track, proposes and a kind of is totally different from the wireless based on Zigbee of traditional technology thinking
The wind power plant numerical indexes formula ammeter design scheme of local area network, it is for convenience, described " based on Zigbee WLAN
Numerical indexes driving assembly " is referred to as " stepper assemblies ", and particular content is as follows:
Wind power plant numerical indexes formula ammeter based on Zigbee WLAN, including front frame, center, rear cover, panel, stepping
Electric machine assembly, pointer, electric current preprocessing module, are characterized by: the wind-powered electricity generation number of fields based on Zigbee WLAN
Word indicator type current meter, by stepper assemblies, pointer, electric current preprocessing module and panel be encapsulated in by front frame, center and after
It covers in surrounded space；
There is a pillar in the quadrangle of the front frame respectively, and the quadrangle of the center has a mounting hole, the rear cover
Quadrangle has a rear cover screw hole, and when installation, screw is each passed through the pillar of rear cover screw hole, the mounting hole of center and front frame
It is connected；
Silk-screen has the indicating graduation of ammeter on the panel；
PCB circuit board built in the stepper assemblies, it is thin that a face Surface Mount of PCB circuit board is welded with ARM chip, micro-stepping
Divide driving chip, wireless signal interface chip, signal router, coordinator chip；The another side installation of PCB circuit board is cored
The pin of body, excitation wire packet, driving gear set, the excitation wire packet is welded in PCB circuit board；
An external 2.4GHz antenna, the output shaft of stepper assemblies on the antenna installation step of the stepper assemblies
After stretching out from the shaft step of shell, it is socketed pointer；
When the stepper assemblies assemble, PCB circuit board is placed on the arc steps of stepper assemblies shell, stepping
In four iron-core workpiece mounting holes on iron core pillar body insertion iron-core workpiece in electric machine assembly shell, six screws pass through stepping electricity
After the shell of thermomechanical components, the installation circular hole of PCB circuit board, it is connected with arc steps；
It is realized and is electrically connected by connecting cable between the electric current preprocessing module and stepper assemblies, connecting cable is
4 cored structures, one is positive pole, and one is power cathode, and in addition two are serial data out line, pre-processes mould from electric current
After the other end for the connecting cable that block stretches out passes through the cable aperture on antenna installation step, it is welded in PCB circuit board；
Flow distribution plate built in the electric current preprocessing module and current sampling circuit, switching power circuit, signal conditioning circuit and
Project amount translation circuit, being welded after element and lead-in clamp and connecting cable becomes a cuboid by encapsulating again；
There are three stepper assemblies fixation hole, screws to pass through center for the bottom surface of the antenna installation step of the stepper assemblies
On mounting hole be connected with stepper assemblies fixation hole；
It is covered out after described there are two wiring post holes, two lead-in clamps in the electric current preprocessing module, from rear
It is stretched out at two wiring post holes of lid.
Further, the front frame, center, rear cover are all made of heat-resisting engineering plastics and are molded.
Further, the output shaft of the stepper assemblies is using stainless pin.
Further, the iron-core workpiece uses permalloy material.
Detailed description of the invention
In order to clearly demonstrate the technical solution of the embodiment of the present invention, attached drawing needed in the embodiment is made below
Simply introduce.Obviously, drawings discussed below is only some embodiments of the present invention, is come for those skilled in the art
It says, without creative efforts, can also draw inferences about other cases from one instance, obtain other similar attached drawings according to these attached drawings.
In particular, the meter full scale on panel is one embodiment, change the range that meter full scale is changeable ammeter.
Wind power plant numerical indexes formula ammeter outline drawing one of the Fig. 1 based on Zigbee WLAN；
Wind power plant numerical indexes formula ammeter outline drawing two of the Fig. 2 based on Zigbee WLAN；
Wind power plant numerical indexes formula ammeter outline drawing three of the Fig. 3 based on Zigbee WLAN；
Wind power plant numerical indexes formula ammeter exploded view one of the Fig. 4 based on Zigbee WLAN；
Wind power plant numerical indexes formula ammeter exploded view two of the Fig. 5 based on Zigbee WLAN；
Wind power plant numerical indexes formula ammeter exploded view three of the Fig. 6 based on Zigbee WLAN；
Wind power plant numerical indexes formula ammeter exploded view four of the Fig. 7 based on Zigbee WLAN；
Wind power plant numerical indexes formula ammeter exploded view five of the Fig. 8 based on Zigbee WLAN；
Fig. 9 stepper assemblies and electric current preprocessing module connection figure one；
Figure 10 stepper assemblies and electric current preprocessing module connection figure two；
Figure 11 stepper assemblies and electric current preprocessing module connection figure three；
Figure 12 stepper assemblies and electric current preprocessing module connection figure four；
Figure 13 stepper assemblies, electric current preprocessing module and center, rear cover connection figure one；
Figure 14 stepper assemblies, electric current preprocessing module and center, rear cover connection figure two；
Figure 15 stepper assemblies exploded view one；
Figure 16 stepper assemblies exploded view two.
Label declaration:
1 front frame
11 pillars
2 centers
21 mounting holes
3 rear covers
31 wiring post holes
32 rear cover screw holes
4 panels
41 scales
5 stepper assemblies
50 cable aperture
51 pointers
52 2.4GHz antennas
53 stepper assemblies fixation holes
54 PCB circuit boards
55 arc steps
56 iron core pillar bodies
57 driving gear sets
58 iron-core workpieces
59 excitation wire packets
60 iron-core workpiece mounting holes
6 electric current preprocessing modules
61 lead-in clamps
62 connecting cables
Specific embodiment
Specific embodiments of the present invention will be described below with reference to the accompanying drawings:
The wind power plant numerical indexes formula ammeter based on Zigbee WLAN, including front frame (1), center (2), after
Cover (3), panel (4), stepper assemblies (5), pointer (51), electric current preprocessing module (6), it is characterised in that:
The wind power plant numerical indexes formula ammeter based on Zigbee WLAN, by stepper assemblies (5), pointer
(51), electric current preprocessing module (6) and panel (4) are encapsulated in the space surrounded by front frame (1), center (2) and rear cover (3)
In；
There is a pillar (11) in the quadrangle of the front frame (1) respectively, and the quadrangle of the center (2) has a mounting hole
(21), the quadrangle of the rear cover (3) has rear cover screw hole (32), and when installation, screw is each passed through rear cover screw hole
(32), the mounting hole (21) of center (2) is connected with the pillar (11) of front frame (1)；
Silk-screen has the indicating graduation (41) of ammeter on the panel (4)；
One face Surface Mount of PCB circuit board (54) built in the stepper assemblies (5), PCB circuit board (54) is welded with ARM core
Piece, micro-stepping Multi-level microstep chip, wireless signal interface chip, signal router, coordinator chip；PCB circuit board (50)
Another side is equipped with iron-core workpiece (58), excitation wire packet (59), driving gear set (57), the pin weldering of the excitation wire packet (59)
It connects on PCB circuit board (54)；
An external 2.4GHz antenna (52), stepper assemblies on the antenna installation step of the stepper assemblies (5)
(5) it after output shaft stretches out from the shaft step of shell, is socketed pointer (51)；
When the stepper assemblies (5) assemble, PCB circuit board (54) places the circular arc in stepper assemblies (5) shell
Four iron-core workpieces in iron core pillar body (56) insertion iron-core workpiece (58) on step (55), in stepper assemblies (5) shell
In mounting hole (60), six screws are after the shell of stepper assemblies (5), the installation circular hole of PCB circuit board (54), with circle
Arc step (55) is connected；
Electrical connection is realized by connecting cable (62) between the electric current preprocessing module (6) and stepper assemblies (5),
Connecting cable (62) is 4 cored structures, and one is positive pole, and one is power cathode, and in addition two are serial data out line,
The other end of the connecting cable (62) stretched out from electric current preprocessing module (6) passes through the cable aperture (50) on antenna installation step
Afterwards, it is welded on PCB circuit board (54)；
Flow distribution plate and current sampling circuit, switching power circuit, signal conditioning circuit built in the electric current preprocessing module (6)
With project amount translation circuit, being welded after element and lead-in clamp and connecting cable (62) becomes a rectangle by encapsulating again
Body；
There are three stepper assemblies fixation hole (53) for the bottom surface of the antenna installation step of the stepper assemblies, and screw passes through
Mounting hole (21) on center (2) is connected with stepper assemblies fixation hole (53)；
There are two opening on the rear cover (3) wiring post holes (31), two inputs in the electric current preprocessing module (6) are connect
Terminal (61) stretches out at two wiring post holes (31) of rear cover (3).
The front frame (1), center (2), rear cover (3) are all made of heat-resisting engineering plastics and are molded.
The output shaft of the stepper assemblies (5) is using stainless pin.
The iron-core workpiece (58) uses permalloy material, because permalloy material is compared with there is higher magnetic under low-intensity magnetic field
Conductance.
Stepper assemblies of the present invention use 5V operating voltage, 0.3333 ° of intrinsic step angle, after Multi-level microstep
Step angle can be reduced to 0.0833 °, and the pointer on axis can be made smoothly to move, and Static output torque actual measurement is 4mNm.
It should be pointed out that the wind power plant numerical indexes formula ammeter based on Zigbee WLAN is to open in this way
Beginning work: built-in electric current preprocessing module is directly by current current measurement value by being converted into step after engineering change of variable
Into stepping angle serial data required for electric machine assembly；Then, which is converted to drive again and referred to by stepper assemblies
The deflection data of needle rotation axis, meanwhile, the current data currently indicated is passed through Zigbee WLAN by stepper assemblies
Local cloud control data corporation is uploaded to, the centralized management of distributed data is completed.
The invention has the following beneficial effects:
1. the present invention is a wind power plant numerical indexes formula ammeter based on Zigbee WLAN, system engineering is used
Design philosophy dexterously data acquisition and data are shown and are separated by component and modularized design, mutual electricity
Magnetic disturbance is minimum, changes the traditional circuit drives mode of numerical indexes ammeter and old stuff road at one stroke, tends to flat in structure
Change, assembly is simple, to provide a kind of low cost, can be mass-produced with convenient for safeguarding based on Zigbee WLAN
Wind power plant numerical indexes formula ammeter solution.
2. in order to meet the requirement of stepper assemblies long-life, driving gear set uses wear-resisting nylon 66 material.
3. progress of the invention substantive includes three parts, first is that built-in electric current preprocessing module can directly by
Current measurement value is converted into stepping angle serial data required for stepper assemblies, and handling the interface of its data becomes very
Simply, accomplish that system saves, is whole excellent；Pointer is driven to turn second is that built-in stepper assemblies can be converted to the serial data
Amount of deflection needed for moving axis；Third is that the current data currently indicated can also be passed through Zigbee wireless local area by stepper assemblies
Cloud data center is passed on the net, the concentration for being particularly suitable for distribution wind-powered electricity generation, photovoltaic generating system and local Internet of Things, which is patrolled, to be managed,
Its unexpected effect is to have filled up the blank of network digital ammeter, is particularly suitable for network instrument and the high-end instrument of wind-powered electricity generation
Digitlization instruction, application prospect is quite wide.
Above-mentioned is the preferred embodiments of the invention.In this specification, apply specific case to the principle of the present invention and
Embodiment is expounded, and is only used for helping to understand core concept of the present invention, be should not be construed as limiting the invention.Institute
The technical staff in category field understands, is not departing from the spirit and scope of the present invention defined by appended claims,
The various change to made by the present invention in form and details, belongs to protection scope of the present invention.
Claims (4)
1. a kind of wind power plant numerical indexes formula ammeter based on Zigbee WLAN, including front frame (1), center (2), after
Cover (3), panel (4), stepper assemblies (5), pointer (51), electric current preprocessing module (6), it is characterised in that:
The wind power plant numerical indexes formula ammeter based on Zigbee WLAN, by stepper assemblies (5), pointer
(51), electric current preprocessing module (6) and panel (4) are encapsulated in the space surrounded by front frame (1), center (2) and rear cover (3)
In；
There is a pillar (11) in the quadrangle of the front frame (1) respectively, and the quadrangle of the center (2) has a mounting hole
(21), the quadrangle of the rear cover (3) has rear cover screw hole (32), and when installation, screw is each passed through rear cover screw hole
(32), the mounting hole (21) of center (2) is connected with the pillar (11) of front frame (1)；
Silk-screen has the indicating graduation (41) of ammeter on the panel (4)；
One face Surface Mount of PCB circuit board (54) built in the stepper assemblies (5), PCB circuit board (54) is welded with ARM core
Piece, micro-stepping Multi-level microstep chip, wireless signal interface chip, signal router, coordinator chip；PCB circuit board (50)
Another side is equipped with iron-core workpiece (58), excitation wire packet (59), driving gear set (57), the pin weldering of the excitation wire packet (59)
It connects on PCB circuit board (54)；
An external 2.4GHz antenna (52), stepper assemblies on the antenna installation step of the stepper assemblies (5)
(5) it after output shaft stretches out from the shaft step of shell, is socketed pointer (51)；
When the stepper assemblies (5) assemble, PCB circuit board (54) places the circular arc in stepper assemblies (5) shell
Four iron-core workpieces in iron core pillar body (56) insertion iron-core workpiece (58) on step (55), in stepper assemblies (5) shell
In mounting hole (60), six screws are after the shell of stepper assemblies (5), the installation circular hole of PCB circuit board (54), with circle
Arc step (55) is connected；
Electrical connection is realized by connecting cable (62) between the electric current preprocessing module (6) and stepper assemblies (5),
Connecting cable (62) is 4 cored structures, and one is positive pole, and one is power cathode, and in addition two are serial data out line,
The other end of the connecting cable (62) stretched out from electric current preprocessing module (6) passes through the cable aperture (50) on antenna installation step
Afterwards, it is welded on PCB circuit board (54)；
Flow distribution plate and current sampling circuit, switching power circuit, signal conditioning circuit built in the electric current preprocessing module (6)
With project amount translation circuit, being welded after element and lead-in clamp and connecting cable (62) becomes a rectangle by encapsulating again
Body；
There are three stepper assemblies fixation hole (53) for the bottom surface of the antenna installation step of the stepper assemblies, and screw passes through
Mounting hole (21) on center (2) is connected with stepper assemblies fixation hole (53)；
There are two opening on the rear cover (3) wiring post holes (31), two inputs in the electric current preprocessing module (6) are connect
Terminal (61) stretches out at two wiring post holes (31) of rear cover (3).
2. the wind power plant numerical indexes formula ammeter according to claim 1 based on Zigbee WLAN, feature
Be: the front frame (1), center (2), rear cover (3) are all made of heat-resisting engineering plastics and are molded.
3. the wind power plant numerical indexes formula ammeter according to claim 1 based on Zigbee WLAN, feature
Be: the output shaft of the stepper assemblies (5) is using stainless pin.
4. the wind power plant numerical indexes formula ammeter according to claim 1 based on Zigbee WLAN, feature
Be: the iron-core workpiece (58) uses permalloy material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811577314.2A CN109507475A (en) | 2018-12-24 | 2018-12-24 | Wind power plant numerical indexes formula ammeter based on Zigbee WLAN |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811577314.2A CN109507475A (en) | 2018-12-24 | 2018-12-24 | Wind power plant numerical indexes formula ammeter based on Zigbee WLAN |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109507475A true CN109507475A (en) | 2019-03-22 |
Family
ID=65754263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811577314.2A Pending CN109507475A (en) | 2018-12-24 | 2018-12-24 | Wind power plant numerical indexes formula ammeter based on Zigbee WLAN |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109507475A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147384A (en) * | 2020-09-28 | 2020-12-29 | 广州市鼎隆机电安装有限公司 | Magnetoelectric ammeter termination |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201450440U (en) * | 2009-05-18 | 2010-05-05 | 彭希南 | Double-sided symmetrical shaft micro-step motor |
| CN101728926A (en) * | 2008-10-14 | 2010-06-09 | 彭希南 | Micro step motor with double driving shafts |
| CN201548613U (en) * | 2009-12-08 | 2010-08-11 | 彭希南 | Universal digital DC voltmeter |
| CN201562009U (en) * | 2009-12-08 | 2010-08-25 | 彭希南 | Universal panel type digital alternating current voltmeter |
| CN204028200U (en) * | 2014-07-22 | 2014-12-17 | 温州市天齐电器有限公司 | A kind of indicator type current meter |
| CN204832319U (en) * | 2015-08-25 | 2015-12-02 | 薛纯良 | Multi -functional pointer ampere meter |
-
2018
- 2018-12-24 CN CN201811577314.2A patent/CN109507475A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101728926A (en) * | 2008-10-14 | 2010-06-09 | 彭希南 | Micro step motor with double driving shafts |
| CN201450440U (en) * | 2009-05-18 | 2010-05-05 | 彭希南 | Double-sided symmetrical shaft micro-step motor |
| CN201548613U (en) * | 2009-12-08 | 2010-08-11 | 彭希南 | Universal digital DC voltmeter |
| CN201562009U (en) * | 2009-12-08 | 2010-08-25 | 彭希南 | Universal panel type digital alternating current voltmeter |
| CN204028200U (en) * | 2014-07-22 | 2014-12-17 | 温州市天齐电器有限公司 | A kind of indicator type current meter |
| CN204832319U (en) * | 2015-08-25 | 2015-12-02 | 薛纯良 | Multi -functional pointer ampere meter |
Non-Patent Citations (1)
| Title |
|---|
| 任益芳等: "《感知层组建综合实训》", 30 June 2013 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147384A (en) * | 2020-09-28 | 2020-12-29 | 广州市鼎隆机电安装有限公司 | Magnetoelectric ammeter termination |
| CN112147384B (en) * | 2020-09-28 | 2021-06-15 | 广州市鼎隆机电安装有限公司 | Magnetoelectric ammeter termination |
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Application publication date: 20190322 |