CN107906022A - A kind of online energy consumption testing analysis method of water pump based on wireless sensor network - Google Patents
A kind of online energy consumption testing analysis method of water pump based on wireless sensor network Download PDFInfo
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- CN107906022A CN107906022A CN201710970602.3A CN201710970602A CN107906022A CN 107906022 A CN107906022 A CN 107906022A CN 201710970602 A CN201710970602 A CN 201710970602A CN 107906022 A CN107906022 A CN 107906022A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
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Abstract
The invention discloses a kind of online energy consumption testing analysis method of water pump based on wireless sensor network, available for industry spot, quickly and accurately pumping system can be monitored, and performance report and the energy consumption analysis report of pump are provided, strategy is provided for unit safety reliability service.Comprise the following steps：S1, select electrical parameter instrument collection driving parameter of electric machine data；S2, collection motor current signal, and motor speed is calculated through signal condition；S3, select the collection water pump operation supplemental characteristic such as sensor, flowmeter；S4, realize communication between instrument and meter and host computer, and data acquisition；S5, design host computer procedure, complete pump performance test and status monitoring, test data are managed.The problem of present invention use wireless technology, solves monitoring system signal and easily disturbs, and wiring is inconvenient, easy for assemble or unload, and set of system can be applied to different monitoring objects, the universality of system, portability and economy are very high.
Description
Technical field
The present invention relates to a kind of online energy consumption testing analysis system of water pump based on wireless sensor network, and in particular to one
Kind can realize the online energy consumption testing of water pump and analysis method based on wireless sensor network.
Background technology
Pump is a kind of important energy conversion and fluid conveying equipment, its species is various, and yield is big, as a kind of universal machine
Tool has been widely used for each department of name of the country economy.And China's pump class product year power consumption accounts for the 1/3 of national power consumption,
Power consumption is huge, energy saving situation very severe.It is big to pump class product power consumption, energy consumption monitoring is carried out to it, obtains the operation work of pump
Condition, energy consumption index, provide strategy for later stage progress energy-saving safety operating and are of great significance, the premise of everything is to need one
Reliable energy-consumption monitoring system.
Current energy-consumption monitoring system is often made of motor speed regulation equipment and pressure, vibration, noise transducer, and these
The unit price that the cost of component is pumped considerably beyond the overwhelming majority, while general set of system is served only for a specific monitoring object,
This more exacerbates the rising of monitoring cost.The sensor majority of current monitoring system is output analog signal, in industry spot
Under complicated electromagnetic environment, signal is easily disturbed, and wiring wiring is cumbersome, so actual often only supervise critical workflow pump
Survey, other number pumps big absolutely in monitoring less or the state without monitoring.Do not conform to plus when the imperfection of front pump design method, type selecting
Reason, the various unreasonable factors such as operational efficiency is low, cause jointly at present pump consume energy big present situation.So develop a kind of cost performance
Height, portable row are strong, the convenient monitoring system of wiring is just particularly important.
In energy-consumption monitoring system is pumped, revolution speed and electric efficiency are relatively difficult to real-time online measuring.Current rotating speed is surveyed
Amount scheme majority universality it is not so good, it is necessary to pump or motor on be reserved with enough installation spaces, when test object cannot stop
Machine, the mechanical structure for being fitted without sensor, or in the case of external electromagnetic interference is stronger, these test methods cannot
Apply.And electric efficiency measurement needs to provide Rated motor loss and no-load loss data, and at present and pump supporting dispatch from the factory
Driving motor will not generally provide these data.It may be referred to standard electromotor relevant parameter in engineering real process, but due to
There is also difference for the difference of processing and manufacturing, actually every motor and standard electromotor parameter.And the two parameter direct relations are electric
Engine efficiency calculates, and needs during acquisition individually to carry out motor performance experiment, test in the case where needing non-shutdown status immediately or not
Possess motor performance experiment under conditions of, hence it is evident that cannot meet test request.
The content of the invention
In order to solve the above technical problems, the present invention provides a kind of online energy consumption testing of water pump based on wireless sensor network
Analysis system, mainly by pump performance and energy consumption of electrical machinery online data measurement acquisition system and data upload process analysis system group
Into available for industry spot, being quickly and accurately monitored to pumping system, and provide the performance report and energy consumption analysis of pump
Report, strategy is provided for unit safety reliability service.
A kind of online energy consumption testing analysis method of water pump based on wireless sensor network, comprises the following steps：
S1, motor electric parameter measurement unit collection water pump driving motor electrical parameter, including voltage, electric current, supply frequency,
Active power, reactive power, power factor；Using motor input and output energy relationship expression formula, therefrom isolated motor
No-load loss, the power input to machine and running current obtained with reference to load-rate of motor calculation formula and intelligent electric meter measurement, obtains
To the efficiency of motor；
S2, motor speed collecting unit select Hall current sensor to be acquired motor current signal, and will collection
To information be input to after signal condition in microcontroller STM32F103, ZoomFFT algorithms are taken in microcontroller, are obtained
Rotor current signal frequency, is calculated motor speed, and it is sent to screen display；
S3, water pump operation measuring unit select monocrystalline silicon formula pressure sensor to be acquired pump import and export pressure, select
Electromagnetic flowmeter and ultrasonic flowmeter are acquired pump discharge；
S4, networking connection communication unit select wireless transmitter by above-mentioned sensor, flowmeter, tachometer and electrical parameter
The RS232/485 physical interfaces of instrument and the physical interface of host computer link together, and form a sensor network, realize instrument
Communication between instrument and host computer, and data acquisition；
S5, upper computer software development block divide into sequence of having the records of distance by the log in development environment Labwindows/CVI, to realize that data are adopted
Collection, complete pump performance test and status monitoring, be managed function to test data.
Further, motor electric parameter measurement unit, its incoming frequency：45~65Hz, rated voltage：AC100V, 400V, volume
Constant current：AC1A、5A.
Further, the Hall current sensor, its specification are：3 μ s of response time, 0~30A of output area, precision
0.2%.
Further, pressure sensor, its specification are：Range -100kPa~100kPa, precision 0.5%, exports RS485, electricity
Source 24VDC.
Further, in the step 2, the supply frequency f of motor operation is obtained from motor electric parameter measurement unit1, should
With the DSP storehouses of STM32, the local spectrum refinement in the range of 0~5Hz of current signal is carried out, analysis draws slip frequency f2, root
According to the rotating speed calculation formula of motor, rotating speed is calculated in host computer.
Further, in the step 1,
In motor operation course, inputting the energy relationship of each several part with exporting can be expressed as
P1=P2+ ∑ P=P2+ΔP0+β2(ΔPe-ΔP0) (1)
In formula, P1Represent power input to a machine；P2Represent the output power of motor；∑ P represents motor total losses；ΔP0
Represent empty load of motor loss；β represents the load factor of motor；ΔPeRepresent loss of electric machine during nominal load；
Wherein, P2Relation with β is
P2=β Pe (2)
In formula, PeFor the rated power of motor, it is η to define Rated motor efficiencye, then have
Variables separation obtains
In formula, empty load of motor loss Δ P0It is input power P1With the function of load factor β；
The load factor of motor is calculated by following empirical equation
In formula, I represents motor operating current；IeRepresent rated current of motor；I0Represent empty load of motor electric current.No-load current
The reference no-load current value of size normative reference motor；
Formula (2) and (3) are substituted into (1), obtain motor operation efficiency calculation formula：
Further, the detailed process of the step 2 is：
Current signal is gathered using Hall current sensor, since rotor current signal is smaller, it is necessary to amplify to it, herein
Using INA128 as pre-low-noise amplifier, it is filtered using OP27 active devices, wherein, two Rg ends of INA128
Between connect the slide rheostat of resistance value 50k, the Vin- ends of INA128 are connected with current sensor port, the Vin+ of INA128,
Ref ends are grounded, the V- of INA128, V+ ends connection 12V power ends, the V0 ends of INA128 by the resistance of connect resistance value 2K and 1K with
OP27 input terminals are connected, and further according to electrically needing to connect some resistance, capacity cell obtains signal conditioning circuit；Signal passes through A/
D is changed, and is sent into microcontroller, and ZoomFFT algorithm calculating is carried out inside microcontroller, therefrom obtains rotor current f2With excitation electric power
Signal frequency f1, according to formulaRotating speed is calculated, and it is sent to screen display.
Further, motor electric parameter measurement unit is using intelligent electrical measuring meter.
The problem of being not easy to industry spot test and poor universality for current revolution speed, proposes to test system from motor side
The no sensor method of system rotating speed；Hardware circuit and single chip processing module are designed, is obtained from motor electric parameter measurement unit
The supply frequency f of motor operation1, using the DSP storehouses of STM32, the local spectrum carried out in the range of 0~5Hz of current signal is thin
Change, analysis draws slip frequency f2, according to the rotating speed calculation formula of motor, rotating speed is calculated in host computer.
Implement the present invention, have the advantages that：
1st, the present invention uses virtual instrument, develops the online energy consumption testing analysis system of water pump based on wireless sensor network
System host computer main program, with reference to serial ports exploitation, multithreading, signal acquisition process and database technology, realizes test number
According to storage, the function such as the management of test record and testing journal sheet；
2nd, each sensor is formed a wireless sensor network by the present invention with wireless technology, by sensor test number
According to computer is sent into, performance monitoring and the energy consumption analysis of pump group are realized, can be to centrifugal pump on-line measurement；
3rd, the present invention can Real time displaying water pump assembly energy consumption and efficiency, the energy consumption and efficiency of water pump assembly can be made point
Analysis, reliable reducing energy consumption suggestion is proposed according to unit actual operating state；
4th, the present invention proposes a kind of test of universal efficient for current rotating speed and the limitation of electric efficiency test method
Scheme, and provide corresponding test philosophy and hardware design, it can be achieved that industry spot on-line testing；
5th, the present invention uses the wireless technology of current mature and reliable, and sensor output signal is transmitted, solved in the wireless network
Monitoring system signal of having determined easily is disturbed, wiring inconvenience the problem of, it is easy for assemble or unload, and set of system can be applied to it is different
Monitoring object, universality, portability and the economy of system greatly improve.
Brief description of the drawings
Fig. 1 is system sensor and instrument disposition figure provided in an embodiment of the present invention；
Fig. 2 is each hardware composition figure of system provided in an embodiment of the present invention；
Fig. 3 is system measurement of rotating speed scheme hardware structure diagram provided in an embodiment of the present invention；
Fig. 4 is system measurement of rotating speed scheme signal modulate circuit figure provided in an embodiment of the present invention；
Fig. 5 is system measurement of rotating speed option A DC7606 interface circuit figures provided in an embodiment of the present invention；
Fig. 6 is system upper computer software programming flowchart provided in an embodiment of the present invention；
In figure, 1, vacuum pump；2nd, pressurized tank；3rd, wireless transmitter；4th, host computer；5th, pressure sensor；6th, test pump；7、
Electrical parameter instrument；8th, ultrasonic flowmeter；9th, motor；10th, vacuum tank；11st, ball valve.
Embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention is further illustrated, but protection scope of the present invention is simultaneously
Not limited to this.
Water pump online energy consumption testing analysis system of the invention based on wireless sensor network includes motor electric parameter measurement
Unit, motor speed collecting unit, water pump operation measuring unit, networking connection communication unit, upper computer software development block；Institute
The motor electric parameter measurement unit stated includes intelligent electrical measuring meter 7；The motor speed collecting unit is sensed including Hall current
Device, single chip processing module；The water pump operation measuring unit includes monocrystalline silicon formula pressure sensor 5, electromagnetic flowmeter, surpasses
Acoustic wave flow meter 8；The networking connection communication unit includes wireless transmitter 3；Wireless transmitter 3 is connected with host computer 4, on
Position machine 4 is built-in with upper computer software development block, and the upper computer software development block includes being based on Labwindows/CVI
The programming of development environment.
As shown in Figure 1, the experimental rig to be analyzed includes vacuum pump 1, pressurized tank 2, test pump 6, motor 9, vacuum tank
10 and ball valve 11；Vacuum pump 1 is connected with the top port of pressurized tank 2；The tank body of pressurized tank 2 is connected by a middle part pipeline
Test pump 6,6 upper end port of test pump connect vacuum tank 10 by pipeline；Another lower channel connection of the tank body of pressurized tank 2
Vacuum tank 10, the top of vacuum tank 10 are connected with ball valve 11.
As shown in Fig. 2, the online energy consumption testing analysis method of water pump based on wireless sensor network comprises the following steps：
S1, the motor electric parameter measurement unit select the electrical parameter of electrical parameter instrument collection water pump driving motor, including electricity
Pressure, electric current, supply frequency, active power, reactive power, power factor etc.；Using motor input and output energy relationship expression formula,
The therefrom no-load loss of isolated motor, the motor input obtained with reference to load-rate of motor calculation formula and intelligent electric meter measurement
Power and running current, obtain the efficiency of motor.
Wherein, in motor operation course, inputting the energy relationship of each several part with exporting can be expressed as
P1=P2+ ∑ P=P2+ΔP0+β2(ΔPe-ΔP0) (1)
In formula, P1Represent power input to a machine；P2Represent the output power (i.e. shaft power) of motor；∑ P represents that motor is total
Loss；ΔP0Represent empty load of motor loss (i.e. fixed loss)；β represents the load factor of motor；ΔPeRepresent electricity during nominal load
Machine is lost.
Wherein, P2Relation with β is
P2=β Pe (2)
In formula, PeFor the rated power of motor.It is η to define Rated motor efficiencye, then have
Variables separation obtains
In formula, empty load of motor loss Δ P0It is input power P1With the function of load factor β.Parameter PeAnd ηeCan be from electricity
Machine dispatches from the factory and obtains on nameplate.In the general power consumption parameter instrument monitoring power input to a machine of industry spot, then determine the negative of motor
Load rate, this provides possibility further to calculate electric efficiency.
The load factor of motor is calculated by following empirical equation
In formula, I represents motor operating current；IeRepresent rated current of motor；I0Represent empty load of motor electric current.No-load current
The reference no-load current value of size normative reference motor.
Formula (2) and (3) are substituted into (1), obtain motor operation efficiency calculation formula
S2, the motor speed collecting unit select Hall current sensor to be acquired motor current signal, and will
It is input to after the signal condition collected in microcontroller, ZoomFFT algorithmic procedures is carried out in microcontroller, you can obtains rotor electricity
Signal frequency is flowed, motor speed is calculated, and it is sent to screen display；
Wherein, the cellular system hardware configuration is as shown in Figure 3；
S3, the water pump operation measuring unit select monocrystalline silicon formula pressure sensor to be acquired pump import and export pressure,
Electromagnetic flowmeter and ultrasonic flowmeter is selected to be acquired pump discharge；
S4, the networking connection communication unit select wireless transmitter by above-mentioned sensor, flowmeter, tachometer and electricity
The RS232/485 physical interfaces of the instruments such as Parameters Instrument and the physical interface of host computer link together, and form a sensor network
Network, realizes the communication between instrument and meter and host computer, and data acquisition；
S5, the upper computer software development block divide into sequence of having the records of distance by the log in development environment Labwindows/CVI, to realize number
According to collection, complete pump performance test and status monitoring, the function such as be managed to test data.
Wherein, the unit program design flow diagram is as shown in Figure 6.
Wherein, the step S1 specifically includes step：Using the electrical parameter of intelligent electrical measuring meter measurement water pump driving motor, bag
Include voltage, electric current, supply frequency, active power, reactive power and power factor etc..Wherein incoming frequency：45~65Hz, it is specified
Voltage：AC100V, 400V, rated current：AC1A、5A.
Wherein, the step S2 specifically includes step：Motor current signal is acquired using Hall current sensor,
And will be input to after the signal condition collected in microcontroller, ZoomFFT algorithmic procedures are carried out in microcontroller, you can turned
Electron current signal frequency, is calculated motor speed, and it is sent to screen display.Wherein Hall current senses, its specification is：
3 μ s of response time, 0~30A of output area, precision 0.2%.Need to carry out anti-aliasing filter, this process bag after signal acquisition
Containing two parts of amplification and filtering.Since rotor current signal is smaller, it is necessary to be amplified to it, herein using INA128 conducts
Pre-low-noise amplifier, it forms differential amplification structure by three operational amplifiers, has that precision is high, the suppression of low in energy consumption, common mode
The advantages that system is wider than high and working band.Filtering uses OP27 active devices, it is that a kind of second order Infinite gain multichannel is anti-
Active low-pass filter is presented, there is low maladjustment voltage and drift characteristic.Main Analysis rotor current signal herein, but it is electric
The frequency of the excitation electric power signal of machine is equally indispensable, while rotor current signal frequency is in the range of 0~5Hz, institute
To set the cutoff frequency of wave filter as 100Hz.Signal conditioning circuit is as shown in Figure 4.A/D transfer processes use 7606 cores of ADC
Piece, the signal changed by 7606 chips of ADC all into 16, can with PA, PB in STM32F103ZET6 microcontrollers in scheme,
PC, PD port parallel port connect, with reference to the signal conditioning circuit of front end, you can realize high-speed sampling.7606 chips of ADC support 16
Position multi-channel synchronous bipolarity sampling, all passages can be sampled with being up to the speed of 200kSPS, this and STM32 are done
The requirement of high-speed dsp is consistent.Integrated chip simulation input clamping protection, tracking hold amplifier and speed buffering are parallel
Interface.General Approach by inchmeal (SAR) type ADC, its equivalent input impedance is related to sample frequency, in some high-speed sampling fields
Close, the selection of sampling capacitance front-end driven amplifier is very harsh, and 7606 chip internal signal conditioning circuits of ADC contain it is low
The signal conditioning circuit of noise, high input impedance, its equivalent input impedance are totally independent of sample rate and are fixed as 1M Ω, are adapted to
In high speed acquisition occasion.So 7606 chips of ADC are a kind of more satisfactory A/D conversion chips, turn by 7606 chips of ADC
The signal changed is all 16, can be connected with PA, PB, PC, PD port parallel port of STM32F103ZET6 microcontrollers in scheme, is tied
Close the signal conditioning circuit of front end, it is possible to realize high-speed sampling.Circuit diagram is as shown in Figure 5.Signal is changed by A/D, is sent into
Microcontroller, ZoomFFT algorithm calculating is carried out inside microcontroller, therefrom obtains rotor current f2With excitation frequency power signal f1,
According to formulaRotating speed is calculated, and it is sent to screen display.
Wherein, the step S3 specifically includes step：Pump import and export pressure is carried out using monocrystalline silicon formula pressure sensor
Collection, is acquired pump discharge using electromagnetic flowmeter and ultrasonic flowmeter.As shown in Figure 1, experiment passes through control valve
Aperture controls pump inlet flow, thus obtain under each operating mode pump discharge with into and out of pressure data.Wherein inlet pressure senses
Device, its specification are：Range -100kPa~100kPa, precision 0.5%, exports RS485, power supply 24VDC；Outlet pressure sensor,
Its specification is：0~1Mpa of range, precision 0.5%, exports RS485, power supply 24VDC.
Wherein, the step S4 specifically includes step：Using DTK wireless transmitters by above-mentioned sensor, flowmeter, turn
The RS232/485 physical interfaces of instrument such as speed meter and electrical parameter instrument and the physical interface of host computer link together, and form one
Sensor network, realizes the communication between instrument and meter and host computer, and data acquisition.It is currently based on the wireless of ZigBee
Transmitter technology maturation, supports to connect by RS485/232 interfaces between instrument and meter, even if the sensor that system is related to
It is relatively more with instrument, merely with a physical interface on host computer, it can also realize that networking measures.Will be with sensor and instrument
Connected transmitter is arranged to from node, and the transmitter being connected with host computer is arranged to host node, is advised according to the networking of transmitter
Then automatic network-building, the communication pattern of point-to-point is supported between main and subordinate node, can send test parameter to host computer after networking,
Realize the wireless measurement of parameter.
Wherein, the step S5 specifically includes step：Sequence of having the records of distance by the log is divided into development environment Labwindows/CVI, to realize
Data acquisition, complete pump performance test and status monitoring, the function such as be managed to test data.The wireless transmitter of host node
The request for reading data is sent to each hardware, is converted to from node response and return measurement data, test data by processing
The performance data of pump, it is theoretical with reference to pump energy consumption analysis, the performance of pump is converted into energy consumption index, most monitoring result reflection is arrived at last
In test report.
Implement the embodiment of the present invention, have the following advantages that：
1st, the present invention uses virtual instrument, develops the online energy consumption testing analysis system of water pump based on wireless sensor network
System host computer main program, with reference to serial ports exploitation, multithreading, signal acquisition process and database technology, realizes test number
According to storage, the function such as the management of test record and testing journal sheet；
2nd, each sensor is formed a wireless sensor network by the present invention with wireless technology, by sensor test number
According to computer is sent into, performance monitoring and the energy consumption analysis of pump group are realized, can be to centrifugal pump on-line measurement；
3rd, the present invention can Real time displaying water pump assembly energy consumption and efficiency, the energy consumption and efficiency of water pump assembly can be made point
Analysis, reliable reducing energy consumption suggestion is proposed according to unit actual operating state；
4th, the present invention proposes a kind of test of universal efficient for current rotating speed and the limitation of electric efficiency test method
Scheme, and provide corresponding test philosophy and hardware design, it can be achieved that industry spot on-line testing；
5th, the present invention uses the wireless technology of current mature and reliable, and sensor output signal is transmitted, solved in the wireless network
Monitoring system signal of having determined easily is disturbed, wiring inconvenience the problem of, it is easy for assemble or unload, and set of system can be applied to it is different
Monitoring object, universality, portability and the economy of system greatly improve.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ",
The description of " example ", " specific example " or " some examples " etc. means to combine specific features, the knot that the embodiment or example describe
Structure, material or feature are contained at least one embodiment of the present invention or example.In the present specification, to above-mentioned term
Schematic representation may not refer to the same embodiment or example.Moreover, specific features, structure, material or the spy of description
Point can combine in an appropriate manner in any one or more embodiments or example.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
In the case of departing from the principle of the present invention and objective a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The scope of invention is limited by claim and its equivalent.
Claims (8)
1. the online energy consumption testing analysis method of a kind of water pump based on wireless sensor network, it is characterised in that including following step
Suddenly：
The electrical parameter of S1, motor electric parameter measurement unit collection water pump driving motor, including it is voltage, electric current, supply frequency, active
Power, reactive power, power factor；Using motor input and output energy relationship expression formula, the therefrom zero load of isolated motor
Loss, the power input to machine and running current obtained with reference to load-rate of motor calculation formula and intelligent electric meter measurement, obtains electricity
The efficiency of machine；
S2, motor speed collecting unit select Hall current sensor to be acquired motor current signal, and will collect
Information is input to after signal condition in microcontroller STM32F103, and ZoomFFT algorithms are taken in microcontroller, obtain rotor
Current signal frequency, is calculated motor speed, and it is sent to screen display；
S3, water pump operation measuring unit select monocrystalline silicon formula pressure sensor to be acquired pump import and export pressure, select electromagnetism
Flowmeter and ultrasonic flowmeter are acquired pump discharge；
S4, networking connection communication unit select wireless transmitter by above-mentioned sensor, flowmeter, tachometer and electrical parameter instrument
The physical interface of RS232/485 physical interfaces and host computer links together, and forms a sensor network, realizes instrument and meter
Communication between host computer, and data acquisition；
S5, upper computer software development block divide into sequence of having the records of distance by the log in development environment Labwindows/CVI, to realize data acquisition, complete
Into pump performance test and status monitoring, function is managed to test data.
2. the online energy consumption testing analysis method of a kind of water pump based on wireless sensor network according to claim 1, its
It is characterized in that, motor electric parameter measurement unit, its incoming frequency：45~65Hz, rated voltage：AC100V, 400V, specified electricity
Stream：AC1A、5A.
3. the online energy consumption testing analysis method of a kind of water pump based on wireless sensor network according to claim 1, its
It is characterized in that, the Hall current sensor, its specification is：3 μ s of response time, 0~30A of output area, precision 0.2%.
4. the online energy consumption testing analysis method of a kind of water pump based on wireless sensor network according to claim 1, its
It is characterized in that, pressure sensor, its specification is：Range -100kPa~100kPa, precision 0.5%, exports RS485, power supply
24VDC。
5. the online energy consumption testing analysis method of a kind of water pump based on wireless sensor network according to claim 1, its
It is characterized in that, in the step 2, the supply frequency f of motor operation is obtained from motor electric parameter measurement unit1, using STM32
DSP storehouses, carry out in the range of 0~5Hz of current signal local spectrum refinement, analysis draw slip frequency f2, according to motor
Rotating speed calculation formula, rotating speed is calculated in host computer.
6. a kind of online energy consumption testing analysis system of water pump based on wireless sensor network as claimed in claim 1, it is special
Sign is, in the step 1,
In motor operation course, inputting the energy relationship of each several part with exporting can be expressed as
P1=P2+ ∑ P=P2+ΔP0+β2(ΔPe-ΔP0) (1)
In formula, P1Represent power input to a machine；P2Represent the output power of motor；∑ P represents motor total losses；ΔP0Represent
Empty load of motor is lost；β represents the load factor of motor；ΔPeRepresent loss of electric machine during nominal load；
Wherein, P2Relation with β is
P2=β Pe (2)
In formula, PeFor the rated power of motor, it is η to define Rated motor efficiencye, then have
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<mn>2</mn>
</msup>
</mrow>
</mfrac>
</msqrt>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>5</mn>
<mo>)</mo>
</mrow>
</mrow>
In formula, I represents motor operating current；IeRepresent rated current of motor；I0Represent empty load of motor electric current.No-load current size
The reference no-load current value of normative reference motor；
Formula (2) and (3) are substituted into (1), obtain motor operation efficiency calculation formula：
<mrow>
<msub>
<mi>&eta;</mi>
<mi>m</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>&beta;P</mi>
<mi>e</mi>
</msub>
</mrow>
<mrow>
<msub>
<mi>&beta;P</mi>
<mi>e</mi>
</msub>
<mo>+</mo>
<msub>
<mi>&Delta;P</mi>
<mn>0</mn>
</msub>
<mo>+</mo>
<msup>
<mi>&beta;</mi>
<mn>2</mn>
</msup>
<mo>&lsqb;</mo>
<mrow>
<mo>(</mo>
<mfrac>
<mn>1</mn>
<msub>
<mi>&eta;</mi>
<mi>e</mi>
</msub>
</mfrac>
<mo>-</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
<msub>
<mi>P</mi>
<mi>e</mi>
</msub>
<mo>-</mo>
<msub>
<mi>&Delta;P</mi>
<mn>0</mn>
</msub>
<mo>&rsqb;</mo>
</mrow>
</mfrac>
<mo>&times;</mo>
<mn>100</mn>
<mi>%</mi>
<mo>.</mo>
</mrow>
7. the online energy consumption testing analysis method of a kind of water pump based on wireless sensor network according to claim 1, its
It is characterized in that, the detailed process of the step 2 is：
Current signal is gathered using Hall current sensor, since rotor current signal is smaller, it is necessary to amplify to it, is used herein
INA128 is filtered using OP27 active devices as pre-low-noise amplifier, wherein, between two Rg ends of INA128
The slide rheostat of resistance value of connecting 50k, the Vin- ends of INA128 are connected with current sensor port, the Vin+ of INA128, Ref ends
Ground connection, the V- of INA128, V+ ends connection 12V power ends, the resistance and OP27 that the V0 ends of INA128 pass through connect resistance value 2K and 1K
Input terminal is connected, and further according to electrically needing to connect some resistance, capacity cell obtains signal conditioning circuit；Signal turns by A/D
Change, be sent into microcontroller, ZoomFFT algorithm calculating is carried out inside microcontroller, therefrom obtains rotor current f2With excitation electric power letter
Number frequency f1, according to formulaRotating speed is calculated, and it is sent to screen display.
8. the online energy consumption testing analysis method of a kind of water pump based on wireless sensor network according to claim 1, its
It is characterized in that, motor electric parameter measurement unit is using intelligent electrical measuring meter.
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| CN110345085A (en) * | 2019-07-02 | 2019-10-18 | 上海景能电气有限公司 | It is a kind of applied to without sensing shielding pump discharge lift control method |
| CN110486264A (en) * | 2019-07-24 | 2019-11-22 | 嘉兴市澳优节能评估服务有限公司 | Infusion pipe network energy-saving monitoring method |
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| CN110486264A (en) * | 2019-07-24 | 2019-11-22 | 嘉兴市澳优节能评估服务有限公司 | Infusion pipe network energy-saving monitoring method |
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