CN106772041A - A kind of centrifugal pump motor state monitoring apparatus and monitoring method based on Android platform - Google Patents
A kind of centrifugal pump motor state monitoring apparatus and monitoring method based on Android platform Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 34
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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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
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Abstract
The invention discloses a kind of centrifugal pump motor state monitoring apparatus based on Android platform and monitoring method, including the centrifugal pump motor electric current based on ATT7022B chips, voltage signal acquisition module, based on the reception of STM32 micro controller datas, analysis and processing module, data communication and sharing module, Android client and the host computer under Labwindows environment.By the centrifugal pump motor electric current based on ATT7022B chips, voltage signal acquisition module, collection motor stator current signal, voltage signal, current signal, voltage signal are converted into the rotating speed and power signal of centrifugal pump again, then using the power and tach signal for obtaining, with reference to the characteristic curve and proportionality law of pump, converse the performance of pump, such as lift, efficiency equivalent, go to judge corresponding operating mode, information is sent to Android client and host computer by data communication and sharing module again, so as to the state to centrifugal pump carries out remote real time monitoring.The present invention realizes status predication and the monitoring of centrifugal pump merely with motor electrical parameter.
Description
Technical field
The invention belongs to data acquisition technology field, especially a kind of centrifugal pump motor status monitoring based on Android platform
Device and monitoring method.
Background technology
Parameter detecting on water pump, abroad, the correlative study starting of the developed country such as America and Europe it is universal relatively early, at some
The aspects such as the manufacture of field such as specific pump, the internal characteristic test of pump still lead over the country at present.To the external characteristics test device of pump
For, early in 1961, the state-run engineering test room (NEL) of Britain just established the water conservancy machinery testing stand of oneself, can be used for water
The performance test of pump and model turbine (maximum runner diameter 0.5m), can be imitated in two kinds of endless form of open type and enclosed
Rate and cavitation experiment, partial parameters realize semiautomatic control, and experimental data can be painted automatically by computer-automatic collection and treatment
Trial curve processed and printing result of the test.A large amount of Foreign Books and internet data show, at present external water pump testing system
The developed countries such as product comparative maturity, the U.S., Germany have generalized, and show highly integrated, small size, it is removable,
Multi-functional, equipment is complete, it is easy to operate the features such as, the Centrifugal Pump of such as U.S. TecQuipment Inc. productions
Test Set (GH5) be one be used for centrifugal pump test device, be research centrifugal pump under different lifts, flow and rotating speed
Characteristic provides a kind of new method of testing.Although this kind of parallel water pump device has highly integrated, small size, removable, many work(
Can, equipment it is complete, it is easy to operate the advantages of, but function is weak in terms of data processing, lacks Embedded Data Management Analysis system,
It is inefficient.
At home, what the development course of pump measuring technology can be brief is divided into two periods：20 century 70s, 20 generation
The eighties record so far.20 century 70s belong to pointer test system period, the test of pump use substantially discrete instrument and
Instrument measures various physical quantitys.For example, measuring pressure with mercury gage, spring pressure ga(u)ge etc., inner flowmeter, whirlpool are told with text
Flowmeters etc. measure flow, and parameters of electric power is measured with ammeter, voltmeter etc..Tester is bulky, high cost, reliable
Property it is poor, testing crew is more, and workload is big, and test error is big, and it is all asking of existing of this period water pump testing system that efficiency is low
Topic, in order to obtain the hydraulic model of function admirable, generally requires to be repeated a number of times model test, extremely inefficient.
The eighties in 20th century belongs to the automation period of test system so far.With product restructuring and the speed that updates
The quickening of degree, market proposes requirement higher to aspects such as product category, quality, performances, and traditional test method is in test
The aspect such as precision and speed has been difficult to meet the requirement of pump product development and technological transformation.
And the period of this period exactly computer technology, the communication technology and intelligent control technology high speed development, automatic control
Field processed make rapid progress, intelligence instrument, advanced control system etc. emerge in an endless stream, intelligent electromagnetic flowmeter, ultrasonic flowmeter,
Laser flowmeter, intelligent capacitance pressure transmitter, torque rotary speed sensor, Microcomputer Torque Instrument, electronic computer, single-chip microcomputer etc.
Advanced intelligent electronic device is promptly applied in the water pump testing system of a new generation, drastically increases parallel water pump system
The automaticity of system, measuring accuracy, response speed and man efficiency, even so, this test system is there are still some
Problem：
(1) instrument and meter is numerous, relatively costly, and system is huge；
(2) complex interfaces, connecting line is too many, and Computer Communications Interface resource is nervous, difficult in maintenance；
(3) test data analyzer software ease for use, friendly interface are not good enough；
(4) because each instrument employs different communication interfaces, agreement, the difficulty of programming is necessarily increased.In addition, by
In under the protected mode of Windows operating system, it is impossible to which direct access interface card hardware, their driver writes number
Tired, programming is difficult.
The content of the invention
The present invention is numerous for traditional monitoring system instrument instrument, high cost, and system is huge and test data analyzer software
A kind of the problems such as ease for use, friendly interface are not good enough, it is proposed that centrifugal pump motor status monitoring dress based on Android platform
Put and monitoring method, realize that technical scheme is as follows：
A kind of centrifugal pump motor state monitoring apparatus based on Android platform, including centrifugal pump motor signal acquisition mould
Block, message processing module, Android device, host computer；The centrifugal pump motor signal acquisition module connection described information treatment mould
Block, described information processing module connects the Android device and the host computer respectively
The centrifugal pump motor signal acquisition module is realized using current transformer, voltage transformer and electric energy chip；
The current transformer, the voltage transformer are used to gather three-phase electricity, using three-phase three-wire system connection, by the A of three-phase electricity, B,
C three-phases are each passed through current transformer, and using B phases as ground, current transformer can sense the electric current of each phase, and voltage transformer can
To sense the voltage between two-phase；When A, B, C three-phase are each passed through current transformer, voltage transformer and reach electric energy chip,
Electric energy chip stores in a register frequency information and power information；
The three-phase power information that on the one hand described information processing module gathers the current transformer, the voltage transformer
It is transmitted to the host computer；On the other hand described information processing module directly reads the frequency information of electric energy chip corresponding registers
And power information, the leakage field frequency sensed with reference to peripheral leakage field sensor circuit obtains the rotating speed of centrifugal pump, according to the work(for obtaining
Rate and rotary speed information, with reference to Q~P of the pump in the case where rotating speed is determined, the proportionality law of Q~H, Q~η pump characteristic curve and pump is conversed
The performance of pump, finally gives corresponding operating mode；
Three-phase power information of the host computer on the one hand to forwarding is done FFT spectrum and is analyzed by Hanning window, calculates voltage humorous
The ratio of ripple and current harmonics, obtains eccentric spectrum wave frequency rate, with reference to the rotor number of teeth, is calculated revolutional slip, by revolutional slip and
Power supply frequency is that can obtain corresponding rotating speed, then the power information of electric energy chip is read by described information processing module,
According to the power and rotary speed information that obtain, with reference to Q~P of the pump in the case where rotating speed is determined, the ratio of Q~H, Q~η pump characteristic curve and pump
Law, converses the performance of pump, finally gives corresponding operating mode；On the other hand the host computer is realized processing mould to described information
The centrifugation pump condition that block is obtained carries out real-time monitoring；
The Android device is provided with display option, and the centrifugation pump condition for being obtained to described information processing module carries out reality
When monitor.
Further, described information processing module is realized using STM32 controllers.
Further, the electric energy chip is realized using ATT7022B.
Further, the Android device is that bluetooth connection or GPRS connect with the connected mode of described information processing module
Connect.
Further, the connected mode of the host computer and described information processing module is connected or GPRS connects for modbus
Connect.
Further, also including the LCD display being connected with described information processing module, the performance parameter for showing pump.
Based on said apparatus, the invention allows for a kind of centrifugal pump motor status monitoring side based on Android platform
Method：
Step 1, the centrifugal pump motor information gathering based on ATT7022B chips：Use current transformer, voltage transformer
Collection three-phase electricity, using three-phase three-wire system connection, A, B, C three-phase of three-phase electricity are each passed through current transformer, using B phases as
Ground, current transformer can sense the electric current of each phase, and voltage transformer can sense the voltage between two-phase, when A, B, C three-phase
When being each passed through current transformer, voltage transformer and reaching ATT7022B, ATT7022B by calculating by electricity power information and
Frequency information is stored in the corresponding register of chip；
Step 2, the data receiver based on STM32, analyzing and processing：Using STM32 microcontrollers as carrier, connection electric current is mutual
Sensor, voltage transformer and ATT7022B and leakage field frequency sensor circuit；The leakage field frequency sensor circuit utilizes the line of induction
Frequency signal during circle sensing pump operation, is filtered power frequency by low-pass filter circuit, then the low frequency leakage field frequency letter that will be obtained
Number carry out by shaping circuit, signal is become frequency identical square-wave signal, the square-wave signal for obtaining is needed due to relatively fainter
Signal to be amplified by integrated operational amplifier circuit again, STM32 microcontrollers are given by the signal after amplification；
The STM32 directly reads the frequency signal and power signal of ATT7022B computation chip corresponding registers, knot
The leakage field frequency that peripheral leakage field sensation of frequency answers circuit inductance is closed, by power frequency and leakage field frequency formulaObtain pump
Rotating speed, wherein f1It is power frequency, f2For leakage field frequently, p represents number of pole-pairs, and n represents the rotating speed of pump；
According to power and rotary speed information, with reference to Q~P of the pump in the case where rotating speed is determined, the ratio of Q~H, Q~η pump characteristic curve and pump
Example law, converses the performance of pump, so as to obtain corresponding operating mode；
Step 3, the STM32 is communicated with cell-phone customer terminal and host computer respectively, and the operating mode of pump is sent respectively into mobile phone
Client and host computer, realize real-time monitoring.
Further, step 2 also includes：Electric current, voltage letter that the STM32 gathers current transformer, voltage transformer
Breath and power information are transmitted to host computer, and in labview, host computer is to the voltage, the current signal that gather by Hanning window
FFT spectrum analysis is done, the ratio of voltage harmonic and current harmonics is calculated, eccentric spectrum wave frequency rate, is obtained, with reference to the rotor number of teeth, calculated
Revolutional slip is obtained, the rotating speed of pump is obtained by revolutional slip and power supply frequency；
Host computer according to the power and rotating speed for obtaining, with reference to Q~P of the pump in the case where rotating speed is determined, Q~H, Q~η pump characteristic curve
With the proportionality law of pump, the performance of pump is conversed, so as to obtain corresponding operating mode, the state to centrifugal pump is supervised in real time
Survey.
Further, in the step 3, the STM32 is bluetooth or GPRS with the connected mode of the cell-phone customer terminal；Institute
It is modbus or GPRS that STM32 is stated with the connected mode of the host computer.
The beneficial effects of the invention are as follows：
1st, in the case where traditional vibration and pressure sensor is not installed, merely with the electrical parameter of motor, realize
The status predication of centrifugal pump and monitoring.
2nd, the feature of pump power frequency in the case of frequency conversion can be detected using ATT7022B computation chips, with reference to STM32 micro-controls
Device processed can measure rotating speed of the pump under the conditions of frequency conversion.
The 3rd, two kinds of power, measurement schemes of rotating speed are provided, and are shown in same set of system, can mutually check, from
And make the result of measurement more accurate；
Brief description of the drawings
Fig. 1 is a kind of centrifugal pump motor state monitoring apparatus schematic diagram based on Android platform；
Fig. 2 is the first measurement rotating speed scheme；
Fig. 3 is second measurement rotating speed scheme；
Fig. 4 is measurement three-phase electricity, speed-frequency complex chart；
Fig. 5 is condition conversion flow chart.
Specific embodiment
The present invention is numerous for traditional monitoring system instrument instrument, high cost, and system is huge and test data analyzer software
A kind of the problems such as ease for use, friendly interface are not good enough, it is proposed that centrifugal pump motor status monitoring dress based on Android platform
Put and monitoring method, as shown in figure 1, including the centrifugal pump motor electric current based on ATT7022B chips, voltage signal acquisition module,
Based on STM32 data receivers, analysis and processing module, data communication and sharing module, Android client and host computer and aobvious
Display screen.Motor stator electric current is obtained by the centrifugal pump motor electric current based on ATT7022B chips, voltage signal acquisition module to believe
Number, voltage signal, be converted into the rotating speed and power signal of centrifugal pump, power and tach signal that recycling is obtained, with reference to pump
Characteristic curve and proportionality law, converse the performance of pump, such as lift, efficiency equivalent, so as to go to judge corresponding operating mode, to from
The state of heart pump is monitored in real time.
Centrifugal pump motor electric current, voltage signal acquisition module based on ATT7022B chips, Current Transformer, voltage are mutual
Sensor gathers three-phase electricity, using three-phase three-wire system connection, A, B, C three-phase of three-phase electricity is each passed through into current transformer, with B phases
Used as ground, current transformer can sense the electric current of each phase, and voltage transformer can sense the voltage between two-phase, as A, B, C
When three-phase is each passed through current transformer, voltage transformer arrival ATT7022B, ATT7022B is stored up information about power by calculating
In there is the corresponding register of chip, therefore corresponding power signal and frequency letter are read in the corresponding registers of ATT7022B
Number.
It is using STM32 microcontrollers as carrier, by STM32's based on STM32 data receivers, analysis and processing module
Pin connection is electric quantity signal Acquisition Circuit, the leakage field frequency sensor circuit of core by ATT7022B, and wherein leakage field sensation of frequency should
Circuit, frequency signal during pump operation is sensed using induction coil, due to needing rejecting power frequency high-frequency signal to first pass through low pass
Filter circuit filters power frequency, then the low frequency leakage field frequency signal that will be obtained is carried out by shaping circuit, signal is become frequency
Identical square-wave signal, the square-wave signal for obtaining is due to comparing faint, it is necessary to again be amplified signal by integrated operational amplifier circuit, just
In the collection of STM32 microcontrollers.As shown in Figure 4.
Collection with reference to the Acquisition Circuit with ATT7022B as core to tach signal provides two schemes.Scheme one, general
Current transformer, electric current, the voltage signal of voltage transformer collection, are sent to based on Labview environment by the serial ports of STM32
Lower host computer, in labview, host computer to gather voltage, current signal by Hanning window do FFT spectrum analyze, calculate
The ratio of voltage harmonic and current harmonics, obtains eccentric spectrum wave frequency rate, with reference to the rotor number of teeth, revolutional slip is calculated, by turning
Rate and power supply frequency are the rotating speed that can obtain pump, corresponding flow chart such as Fig. 2.Scheme two, STM32 directly reads
The frequency signal and power signal of ATT7022B computation chip corresponding registers, with reference to the leakage that peripheral leakage field sensor circuit senses
Magnet rate, by power frequency and leakage field frequency formulaObtain the rotating speed of pump, wherein f1It is power frequency, f2For leakage field frequently, p
Number of pole-pairs is represented, n represents the rotating speed of pump.Corresponding flow chart such as Fig. 3.
According to the power and tach signal that obtain, with reference to Q~P of the pump in the case where rotating speed is determined, Q~H, Q~η pump characteristic curve and
The proportionality law of pump, converses other performances of pump, such as lift, efficiency equivalent, so as to go to judge corresponding operating mode, to centrifugation
The state of pump is monitored in real time, such as accompanying drawing 5.
According to centrifugal pump actual operating mode and physical fault, such as impeller of pump is stuck, cavitation, water shortage failure when, therefore
Hinder the time-frequency characteristics and fault distinguishing index of corresponding current signal, develop corresponding Android client, corresponding display is set
Option, Android client and the data receiver based on STM32 controllers, the communication between analysis and processing module take two kinds
Mode：1st, bluetooth local area network：Suitable for manager in factory building with centrifugal pump motor apart from relative close when situation；2、GPRS
Wide area network：Suitable for manager and the far situation of centrifugal pump motor respective distance, long-range real-time monitoring is realized.Host computer with
Modbus agreements are taken to pass through Serial Port Transmission data in STM32 controllers, it is also possible to realize long-range reality by GPRS wide area networks
When monitor.
The specific implementation of two of which measurement rotating speed scheme is as follows：
The first measurement rotating speed scheme：
A, B, C three-phase of three-phase electricity are each passed through current transformer, using B phases as ground, current transformer sensing is each
The electric current of phase, the voltage between voltage transformer sensing two-phase, when A, B, C three-phase are each passed through current-voltage transformer, signal
When reaching ATT7022B, corresponding current signal and voltage signal can be read in the corresponding registers of ATT7022B.Collection
Current and voltage signals, sent to based on host computer under Labview environment by the serial ports of STM32, it is upper in labview
Machine does FFT spectrum and analyzes to the signal for gathering by Hanning window, calculates the ratio of voltage harmonic and current harmonics, obtains eccentric spectrum
Wave frequency rate, with reference to the rotor number of teeth, is calculated revolutional slip, is that can obtain corresponding turning by revolutional slip and power supply frequency
Speed, corresponding flow chart such as Fig. 2, according to the power and tach signal that obtain, with reference to Q~P of the pump in the case where rotating speed is determined, Q~H, Q~
The proportionality law of η pump characteristic curves and pump, converses other performances of pump, such as lift, efficiency equivalent, so as to go to judge corresponding
Operating mode, the state to centrifugal pump monitored in real time, such as accompanying drawing 5.
Second measurement rotating speed scheme：
A, B, C three-phase of three-phase electricity are each passed through current transformer, using B phases as ground, current transformer sensing is each
The electric current of phase, the voltage between voltage transformer sensing two-phase, when A, B, C three-phase are each passed through current-voltage transformer signal,
When reaching ATT7022B, corresponding frequency signal and power signal are read in the corresponding registers of ATT7022B.Directly read
The frequency signal and power signal of ATT7022B computation chip corresponding registers, with reference to the leakage that peripheral leakage field sensor circuit senses
Magnet rate, by power frequency and leakage field frequency respective formulaObtain the rotating speed of pump, wherein f1It is power frequency, f2It is leakage field
Frequently corresponding flow chart such as Fig. 3.
Those listed above is a series of to be described in detail only for feasibility implementation method of the invention specifically
Bright, they simultaneously are not used to limit the scope of the invention, all equivalent implementations made without departing from skill spirit of the present invention
Or change should be included within the scope of the present invention.
Claims (9)
1. a kind of centrifugal pump motor state monitoring apparatus based on Android platform, it is characterised in that including centrifugal pump motor letter
Number acquisition module, message processing module, Android device, host computer；The centrifugal pump motor signal acquisition module connects the letter
Breath processing module, described information processing module connects the Android device and the host computer respectively
The centrifugal pump motor signal acquisition module is realized using current transformer, voltage transformer and electric energy chip；It is described
Current transformer, the voltage transformer are used to gather three-phase electricity, using three-phase three-wire system connection, by A, B, C tri- of three-phase electricity
Current transformer is mutually each passed through, using B phases as ground, current transformer can sense the electric current of each phase, voltage transformer can be with
Voltage between sensing two-phase；When A, B, C three-phase are each passed through current transformer, voltage transformer and reach electric energy chip, electricity
Energy chip stores in a register frequency information and power information；
The three-phase power information forwarding that on the one hand described information processing module gathers the current transformer, the voltage transformer
To the host computer；Described information processing module on the other hand directly read electric energy chip corresponding registers frequency information and
Power information, the leakage field frequency sensed with reference to peripheral leakage field sensor circuit obtains the rotating speed of centrifugal pump, according to the power for obtaining and
Rotary speed information, with reference to Q~P of the pump in the case where rotating speed is determined, the proportionality law of Q~H, Q~η pump characteristic curve and pump converses pump
Performance, finally gives corresponding operating mode；
The three-phase power information of the host computer on the one hand to forwarding is done FFT spectrum and is analyzed by Hanning window, calculate voltage harmonic and
The ratio of current harmonics, obtains eccentric spectrum wave frequency rate, with reference to the rotor number of teeth, revolutional slip is calculated, by revolutional slip and power supply
Supply frequency is that can obtain corresponding rotating speed, then the power information of electric energy chip is read by described information processing module, according to
The power and rotary speed information for obtaining, with reference to Q~P of the pump in the case where rotating speed is determined, the ratio of Q~H, Q~η pump characteristic curve and pump is determined
Rule, converses the performance of pump, finally gives corresponding operating mode；On the other hand the host computer is realized to described information processing module
The centrifugation pump condition for obtaining carries out real-time monitoring；
The Android device is provided with display option, and the centrifugation pump condition for being obtained to described information processing module is supervised in real time
Survey.
2. a kind of centrifugal pump motor state monitoring apparatus based on Android platform according to claim 1, its feature exists
In described information processing module is realized using STM32 controllers.
3. a kind of centrifugal pump motor state monitoring apparatus based on Android platform according to claim 1, its feature exists
In the electric energy chip is realized using ATT7022B.
4. a kind of centrifugal pump motor state monitoring apparatus based on Android platform according to claim 1, its feature exists
In the Android device is that bluetooth connection or GPRS are connected with the connected mode of described information processing module.
5. a kind of centrifugal pump motor state monitoring apparatus based on Android platform according to claim 1, its feature exists
It is connected or GPRS is connected for modbus in the connected mode of, the host computer and described information processing module.
6. a kind of centrifugal pump motor state monitoring apparatus based on Android platform according to claim 1, its feature exists
In, also including the LCD display being connected with described information processing module, the performance parameter for showing pump.
7. a kind of centrifugal pump motor state monitoring method based on Android platform, it is characterised in that
Step 1, the centrifugal pump motor information gathering based on ATT7022B chips：Gathered using current transformer, voltage transformer
Three-phase electricity, using three-phase three-wire system connection, current transformer is each passed through by A, B, C three-phase of three-phase electricity, using B phases as ground,
Current transformer can sense the electric current of each phase, and voltage transformer can sense the voltage between two-phase, when A, B, C three-phase difference
When reaching ATT7022B through current transformer, voltage transformer, ATT7022B is by calculating electricity power information and frequency
Information is stored in the corresponding register of chip；
Step 2, the data receiver based on STM32, analyzing and processing：Using STM32 microcontrollers as carrier, Current Mutual Inductance is connected
Device, voltage transformer and ATT7022B and leakage field frequency sensor circuit；The leakage field frequency sensor circuit utilizes induction coil
Frequency signal during sensing pump operation, is filtered power frequency by low-pass filter circuit, then the low frequency leakage field frequency signal that will be obtained
Carry out by shaping circuit, signal is become frequency identical square-wave signal, the square-wave signal for obtaining due to relatively fainter, it is necessary to
Signal is amplified by integrated operational amplifier circuit again, STM32 microcontrollers are given by the signal after amplification；
The STM32 directly reads the frequency signal and power signal of ATT7022B computation chip corresponding registers, with reference to outer
The leakage field frequency that leakage field sensation of frequency answers circuit inductance is enclosed, by power frequency and leakage field frequency formulaObtain turning for pump
Speed, wherein f1It is power frequency, f2For leakage field frequently, p represents number of pole-pairs, and n represents the rotating speed of pump；
According to power and rotary speed information, with reference to Q~P of the pump in the case where rotating speed is determined, the ratio of Q~H, Q~η pump characteristic curve and pump is determined
Rule, converses the performance of pump, so as to obtain corresponding operating mode；
Step 3, the STM32 is communicated with cell-phone customer terminal and host computer respectively, and the operating mode of pump is sent respectively into cell phone customer
End and host computer, realize real-time monitoring.
8. a kind of centrifugal pump motor state monitoring method based on Android platform according to claim 7, its feature exists
In step 2 also includes：Electric current, information of voltage and power letter that the STM32 gathers current transformer, voltage transformer
Breath is transmitted to host computer, and in labview, host computer does FFT spectrum point to the voltage that gathers, current signal by Hanning window
Analysis, calculates the ratio of voltage harmonic and current harmonics, obtains eccentric spectrum wave frequency rate, with reference to the rotor number of teeth, is calculated revolutional slip,
The rotating speed of pump is obtained by revolutional slip and power supply frequency；
Host computer according to the power and rotating speed for obtaining, with reference to Q~P of the pump in the case where rotating speed is determined, Q~H, Q~η pump characteristic curve and pump
Proportionality law, converse the performance of pump, so as to obtain corresponding operating mode, the state to centrifugal pump is monitored in real time.
9. a kind of centrifugal pump motor state monitoring method based on Android platform according to claim 7, its feature exists
In in the step 3, the STM32 is bluetooth or GPRS with the connected mode of the cell-phone customer terminal；The STM32 and institute
The connected mode for stating host computer is modbus or GPRS.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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