CN102032242A - Method for monitoring running state of hydraulic system on line based on electrical parameter information fusion - Google Patents
Method for monitoring running state of hydraulic system on line based on electrical parameter information fusion Download PDFInfo
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Abstract
The invention discloses a method for monitoring running state of a motor-driven hydraulic system on line based on tri-phase electrical parameter information fusion. The method comprises the following steps of: generating a single-phase or tri-phase information fusion method from voltage and current signals of a stator of a driving motor by using a Lissajous figure through non-invasive measurement; drawing planar and three-dimensional Lissajous figures by fully utilizing amplitude, phase information, interphase and phase sequence information which are provided by electrical parameters; calculating a relationship between the electrical parameters and each characteristic quantity of an ellipse; and performing on-line monitoring on the running state, running condition, load power and power matching condition of a transmission device such as a motor, a hydraulic system, a machine and the like in a motor dragging system by observing area, shape, rotating direction and ratio changes of an ellipse graph. And the motor, the machine and hydraulic faults in the hydraulic system can be directly classified and differentiated to provide a reliable basis for accurate diagnosis and energy-saving control.
Description
Technical field
The invention belongs to hydraulic system condition monitoring and fault diagnosis field, relating to a kind of hydraulic system running state on-line monitoring method based on three-phase electricity parameter information fusion, is in the status monitoring and fault diagnosis of motor-driven all hydraulic equipment applicable to power source.
Background technique
Hydraulic system is with its fast response, high-power, high-performance and be easy to remote operation and characteristics such as control, is used as a kind of main transmission device and is widely used in the various machinery.Along with improving constantly of automaticity, the structure and the information exchanging process of hydraulic equipment become increasingly complex, become the Zong He Ti ﹑ automated information conglomerate of mechanical-electrical-hydraulic integration, the Energy Saving Control of hydraulic equipment and fault Zao phase Yu Fang ﹑ forecast and diagnosis become the technical barrier that needs to be resolved hurrily.
Hydraulic equipment is in running, and it is mechanical, electrical, liquid (fluid) parameter is dynamic change, and intercouples, and these parameters can be from different angle (information space) designing and manufacturing level and the running state of consersion unit to some extent.If will fully understand design of plant manufacture level and running state, must mostly adopt the embedded measurement method to the observation of these dynamic parameterss in conjunction with the change procedure of operating mode multianalysis mechanical electronic hydraulic parameter as electric current, voltage, vibration, power, moment of torsion, rotating speed, pressure, flow etc.Because these parameter measurement cost height, be difficult for obtaining, characteristic information is limited and easily disturbed, belongs to non-stationary signal again mostly, use to engineering and bring a lot of difficulties, and certain narrow limitation is arranged.
The claimant finds by long-term theory analysis and a large amount of test: in the hydraulic equipment that motor drags, because the coupling of rotor system, about characteristic informations such as hydraulic equipment situation, load variations and design deficiency can be coupled in the three phase electrical parameters of motor by machinery and fluid parameter, but the three phase current electrical quantity of motor all is a plural number, amplitude is not only arranged but also directive variation.Existingly utilize method that the method that the motor electrical quantity carries out equipment condition monitoring (comprise us before achievement in research) do not find a kind of practicality that the amplitude and the phase information of motor three phase electrical parameters are merged, running state that can not understanding hydraulic equipment directly perceived, comprehensive, reliable, online.
Summary of the invention
Above problem at the prior art existence, the objective of the invention is to, a kind of hydraulic system running state on-line monitoring method based on the electric parameter information fusion is provided, hydraulic equipment is carried out on-line condition monitoring, fault diagnosis and load character and performance analysis, and for the energy-saving design of research hydraulic system with optimize operating mode scientific basis is provided.
In order to realize above-mentioned task, the present invention takes following technical solution:
A kind of hydraulic system running state on-line monitoring method based on the electric parameter information fusion is characterized in that, this method adopts the non-intrusion measurement mode, uses Li Sa to produce single-phase and three-phase information fusion method as figure voltage, the current signal of drive motor stator; Make full use of amplitude that electric parameter provides, phase information, alternate and phase sequence information and draw plane and three-dimensional Lee's Sa as figure, calculate electric parameter and oval each characteristic quantity relation, variation by observation ellipse figure area, shape, sense of rotation and ratio realizes running state, operating conditions, bearing power and the power match situation of transmission devices such as motor, hydraulic pressure, machinery in the motor driving system are monitored in real time, and can carry out discriminant classification to the motor in the dragging system, machinery and hydraulic fault.
Concrete steps are as follows:
1) obtains motor stator three-phase voltage u, current i dynamic simulation electrical signal simultaneously with Hall transducer, send into the A/D sampler after handling through conditioning circuit and obtain the three-phase digital electric signal
With voltage
Be abscissa, electric current
Single-phase and the three-phase lissajous figures for the y coordinate real-time rendering;
2) single-phase electricity parameter Lee Sa such as figure fusion method:
If phase voltage, current signal are respectively
（1）
The voltage signal phase place of (1) formula is added
, promptly
Order
,
, wherein
Be the phase difference of phase current and phase voltage, cos
Be power factor;
With in (2) formula
Cancellation obtains following equation:
(4) formula track in the cartesian coordinate plane is one to be centered close to the ellipse of initial point, is called Lee's Sa such as the equation of voltage, electric current, and the planimetric map drawn of equation is called single-phase electricity parameter Lee Sa as figure thus;
3) three-phase electricity parameter Lee Sa such as figure fusion method
Equally spacedly be illustrated in the same coordinate system as figure single-phase Lee's Sa of three-phase electricity a, b, c phase, successively corresponding point among three-phase Lee Sa such as the figure is linked to each other, the boundary rectangle of while with the maximum of three-phase ellipse is benchmark, draw the boundary rectangle of three-phase ellipse, the variation of three-phase ellipse, boundary rectangle and line thereof can be monitored the running state of three phase electric machine and transmission system thereof;
Simultaneously, use symmetrical component method, with three-phase voltage, Current Decomposition is positive sequence, negative phase-sequence, zero-sequence component, during the non-ground connection of generator neutral point, zero-sequence current is zero, and under the normal condition, motor three-phase power and electric machine structure be symmetry substantially, negative sequence component is very little, and therefore Lee's Sa such as the figure that is made up of negative sequence voltage and negative-sequence current is almost a point;
Secondly, further the motor stator winding three phase circuit is decomposed under the two-phase rest frame, during the three phase circuit symmetry, pairing biphase current amplitude equates, phase phase difference 90 degree, so its Lee's Sa such as figure are the circle of a standard;
Fusion method comprehensive monitoring and analysis with above-mentioned three-phase electricity parameter obtain accurate and reliable hydraulic system status monitoring and failure diagnosis information.
Above-mentioned Lee's Sa such as figure carry out single-phase and three-phase electricity parameter information fusion method has following three kinds of modes:
1) a, b, c phase Lee's Sa such as the figure with three-phase electricity places under the same coordinate system, and corresponding point is connected, and the boundary rectangle of while with the maximum of three-phase ellipse is benchmark, draws the boundary rectangle of three-phase ellipse;
2) three-phase voltage, electric current are carried out the symmetrical component method conversion, negative sequence voltage, electric current are merged with single-phase fusion method;
3) three phase circuit is transformed under the two-phase rest frame, and merges with Li Sa such as method;
Comprised comprehensive, the effective information of running state, operating conditions, bearing power and the power match situation of transmission devices such as motor, hydraulic pressure, machinery in the hydraulic system in the figure after three kinds of fusion methods merge.
The technique effect that is brought based on the motor driving hydraulic system running state on-line monitoring method of three-phase electricity parameter information fusion of the present invention is:
1, compares with Dynamic Signals such as mechanical vibration, hydrodynamic pressure and flows, the amplitude of motor stator three phase circuit and voltage signal and phase place are the most responsive to the hydraulic system running state, contain the characteristic information that reflects motor, oil hydraulic pump and mechanical device running state, and having advantages such as steady, that signal to noise ratio is high, easily obtain.
2, adopt the method for measurement of non-intrusion type, with electric moter voltage, the amplitude of current signal and phase information are carried out single-phase and the three-phase convergence analysis with Li Sa such as figure, calculate electric parameter and oval each characteristic quantity relation, by calculating the ellipse figure area, shape, sense of rotation, the variation of angle of swing and ratio realizes motor in the hydraulic system, hydraulic pressure, the running state of transmission devices such as machinery, operating conditions, bearing power and power match situation are monitored in real time, and can be to the motor in the dragging system, machinery and hydraulic fault carry out discriminant classification, for accurately diagnosis and Energy Saving Control provide reliable basis.
3, single-phase Lee's Sa such as the figure track rotation direction decidable load characteristic that forms according to this method, the Li Sa such as the area of pictural surface be the size and the Changing Pattern of reaction load power directly, according to the rotation direction and the inclination angle Changing Pattern of formed ellipse, but directly monitoring and judge hydraulic system typical conditions such as loading, off-load, impact, overload; In addition, Lee's Sa that forms three-phase voltage, electric current Lee Sa such as figure and negative sequence voltage and negative-sequence current according to this method is as figure, the threephase stator electric current combines corresponding to electric current Lee Sa such as figure under the static two-dimensional coordinate system, can extract more characteristic information, not only can intuitively reflect system running state, and can directly make preliminary judgement to typical electrical failure, also can differentiate hydraulic equipment electrical failure and mechanical failure respectively, for accurate diagnosis provides foundation more reliably.
4, common, system has peak efficiency when the rated operation point smooth running, therefore the hydraulic power system design is often as starting point, and power output device left the certain power deposit, but the load of hydraulic equipment is with the operating mode transient change, the power control strategy of motor is the variation of adaptation condition and load how, does not have the visual monitoring technology can online observation motor and the matching state of load instantaneous power at present.Can in the hydraulic equipment running, carry out on-line monitoring and make it and motor realization Adaptive matching control strategy according to this method, and then reach energy-conservation purpose, have important application value operating mode and load power.
Description of drawings
Fig. 1 is based on the hydraulic system running state on-line monitoring method schematic diagram of electric parameter information fusion;
Fig. 2 be electric parameter single-phase Lee's Sa as figure;
Fig. 3 be electric parameter three-phase Lee Sa as figure;
Fig. 4 is that the following negative sequence voltage electric current Lee Sa of normal operation is as figure;
Fig. 5 is that the Lee Sa of three phase circuit under static two-dimensional coordinate system is as figure;
Fig. 6 (a+) loads 0～15M, motor a phase voltage electric current Lee's Sa such as figure Changing Pattern for hydraulic system;
Fig. 6 (a-) loads 15Mpa～0 overall process, motor a phase voltage electric current Lee's Sa such as figure Changing Pattern for hydraulic system;
Fig. 6 (b+) loads 0～15Mpa overall process, motor b phase voltage electric current Lee's Sa such as figure Changing Pattern for hydraulic system;
Fig. 6 (b-) is hydraulic system unloading 15Mpa～0 overall process, motor b phase voltage electric current Lee's Sa such as figure Changing Pattern;
Fig. 6 (c+) loads 15Mpa～0 overall process, motor c phase voltage electric current Lee's Sa such as figure Changing Pattern for hydraulic system;
Fig. 6 (c-) is hydraulic system unloading 15Mpa～0 overall process, motor c phase voltage electric current Lee's Sa such as figure Changing Pattern;
Fig. 7 adds characteristic quantity Changing Pattern such as Li Sa such as the area of pictural surface, angle of swing and direction, boundary rectangle area and power factor under the off-load operating mode for hydraulic system;
Lissajous figures characteristic quantity analysis result when Fig. 8 for hydraulic system the overload overflow takes place;
Three-phase lissajous figures feature when Fig. 9 repeatedly withstands shocks load operation for hydraulic system;
Figure 10 for the hydraulic system motor when phase shortage (c breaks mutually) state moves, three-phase Lee Sa such as figure feature;
Figure 11 be the hydraulic system motor when short circuit (short circuit of a phase) state moves, three-phase Lee Sa such as figure feature.
The present invention is described in further detail below in conjunction with drawings and Examples.
Embodiment
As shown in Figure 1, hydraulic system running state on-line monitoring method based on the electric parameter information fusion of the present invention adopts the non-intrusion measurement mode, voltage, the current signal (with no-load running voltage, current signal is reference value, gets the ratio of working voltage, current signal and reference value) of drive motor stator are produced single-phase and three-phase information fusion method with Li Sa as figure.Make full use of the amplitude that electric parameter provides, phase information, alternate and phase sequence information is drawn plane and three-dimensional Lee's Sa as figure, calculate electric parameter and oval each characteristic quantity relation, by calculating Lee's Sa such as figure graphics area, shape, sense of rotation, the variation of angle of swing and ratio realizes motor in the hydraulic equipment, hydraulic pressure, the running state of transmission devices such as machinery, operating conditions, bearing power and power match situation are monitored in real time, and can be to the motor in the hydraulic equipment, machinery and hydraulic fault carry out discriminant classification, for accurately diagnosis and Energy Saving Control provide reliable basis.
Concrete steps are as follows:
1) sees Fig. 1, obtain motor stator three-phase voltage u, current i analog electric signal (electric parameter) simultaneously, send into the six passage digital electric signals that the A/D sampler obtains three phase electrical parameters after handling through conditioning circuit with Hall transducer
, with voltage
Be abscissa, electric current
Single-phase and the three-phase lissajous figures for the y coordinate real-time rendering.
2) single-phase electricity parameter Lee Sa such as figure fusion method
If phase current, voltage signal are respectively
The voltage signal phase place of (1) formula is added
, promptly
Order
,
, wherein
Be the phase difference of phase current and phase voltage, cos
Be power factor.
With in (2) formula
Cancellation obtains equation
（4）
(4) formula track in the cartesian coordinate plane is one to be centered close to the ellipse of initial point, as shown in Figure 2, can be described as Lee's Sa such as the equation of voltage, electric current, and the planimetric map drawn of equation is called single-phase electricity parameter Lee Sa as figure thus.
3) three-phase electricity parameter Lee Sa such as figure fusion method
As shown in Figure 3, equally spacedly be illustrated in the same coordinate system as figure single-phase Lee's Sa of a, b, c phase, successively corresponding point among three-phase Lee Sa such as the figure is linked to each other, the boundary rectangle of while with the maximum of three-phase ellipse is benchmark, draws the boundary rectangle of three-phase ellipse as shown in Figure 3.The variation of three-phase ellipse, boundary rectangle and line thereof can be monitored the running state of three phase electric machine and transmission system thereof.Simultaneously, use symmetrical component method, with three-phase voltage, Current Decomposition is positive sequence, negative phase-sequence, zero-sequence component, during the non-ground connection of generator neutral point, zero-sequence current is zero, under the normal condition, motor three-phase power and electric machine structure be symmetry substantially, negative sequence component is very little, and therefore Lee's Sa such as the figure that is made up of negative sequence voltage and negative-sequence current is almost a point, as shown in Figure 4.Secondly, further the motor stator winding three phase circuit is decomposed under the two-phase rest frame, during the three phase circuit symmetry, pairing biphase current amplitude equates, phase phase difference 90 degree, so its Lee's Sa such as figure be the circle of a standard, as shown in Figure 4.
Fusion method comprehensive monitoring and analysis with above-mentioned three-phase electricity parameter, with single-phase electricity parameter fusion ratio, the fusion of three-phase electricity parameter is because comprised more fully electrical quantity quantity of information of operation motor, can derive more effective information by optimum organization, reduce the uncertainty of information information.
2, utilize Lee's Sa such as figure to carry out single-phase and three-phase electricity parameter information fusion has three kinds of modes:
1) a, b, c phase Lee's Sa such as figure are placed under the same coordinate system, and corresponding point is connected, the boundary rectangle of while with the maximum of three-phase ellipse is benchmark, draws the boundary rectangle of three-phase ellipse.
2) three-phase voltage, electric current are carried out the symmetrical component method conversion, negative sequence voltage, electric current are merged with single-phase fusion method.
3) three phase circuit is transformed under the two-phase rest frame, and merges with Li Sa such as method.
Comprised comprehensive, the effective characteristic information of running state, operating conditions, bearing power and the power match situation of transmission devices such as motor, hydraulic pressure, machinery in the motor driving system in the figure after three kinds of methods merge.
3, each characteristic quantity relation of three-phase electricity parameter and ellipse and hydraulic equipment running state and oval feature magnitude relation are as follows:
1) elliptical orbit rotation direction: when the elliptical orbit rotation direction was counterclockwise, voltage delay was in electric current; When the elliptical orbit rotation direction was clockwise, voltage was ahead of electric current.For variable working condition load, when elliptical orbit rotation direction when being clockwise, asynchronous motor is electronic operating mode; When elliptical orbit rotation direction when being counterclockwise, asynchronous motor is a generating operation mode.Therefore can judge load character and energy-storage travelling wave tube characteristic according to the elliptical orbit rotation direction.
2) ellipse area: can obtain ellipse area by analyzing
, wherein
Be single-phase average active power,
Be three phases active power, visible ellipse area is with the proportional variation of motor active power.
3) oval inclination angle: can obtain oval inclination angle by analyzing
, when no electrical failure, load variations is right
Influence very remarkable.
4) oval boundary rectangle: half of the length of side of boundary rectangle represented the maximum value of x axle and y axle respectively, and the maximum value of y axle is a current amplitude, and the maximum value of x axle is a voltage magnitude; Parameter by oval boundary rectangle changes the intuitively Changing Pattern of reflecting voltage, current signal amplitude.Also can obtain by analyzing
, wherein
Be the motor apparen power, i.e. capacity, the area of visible boundary rectangle is 2 times of the input apparen power, promptly the area change of boundary rectangle can directly reflect the variation of motor apparen power.
Provided motor stator three-phase voltage, current information fusion method above, and provided concrete fusion steps and computational methods based on Li Sa such as figure, and the relation of hydraulic system running state and oval feature amount.Be applicable to that all motors drag the on-line condition monitoring and the fault diagnosis of hydraulic system.Below provide a specific embodiment, the hydraulic system running state on-line monitoring that this embodiment drags for threephase asynchronous machine.This hydraulic system experimental setup principle and experimental technique are referring to the number of patent application 200810232493.6 of Patent Office of State Intellectual Property Office in January, 2010 issue, and name is called " multi-source diagnostic information of hydraulic equipment obtains experimental setup and experimental technique thereof " patent of invention specification.
On this experimental setup, the claimant utilizes method of the present invention to carry out the hydraulic power system that threephase asynchronous machine drags respectively to add load shedding, overload overflow, impact load, the motor phase failure and short circuit experiment, and result of implementation is as follows:
1) motor driving system increases and during the operation of minimizing state at load, three-phase Lee Sa such as figure feature.(measured data as shown in Figure 6, non-filtered is handled), when hydraulic power system adds load shedding, can see by the formed drive motor a of the inventive method, b, c three phase electrical parameters Lee's Sa such as figure variation situation: oval area progressively increases when loading, simultaneously ellipse is rotated counterclockwise that (annotate: oval initial area is determined by sensor gain, oval inclination angle sense of rotation is relevant with transducer arrangements, therefore sensor gain and wiring are arranged and will be immobilized in the implementation process), be that oval inclination angle increases, it is very little simultaneously can to find out that also oval x axle maximum value (voltage magnitude) changes in loading procedure, and y axle maximum value (current amplitude) progressively increases along with loading; Keep 15MP when being loaded on 15MP(at 50.4s～51.2s time period pressure) time, system begins off-load, can see that this moment, ellipse area progressively reduced, ellipse turns clockwise simultaneously, be that oval inclination angle progressively reduces, and x axle maximum value is constant, y axle maximum value is along with off-load progressively reduces.By forming oval continuous differentiation at 3, the elliptical orbit rotation direction is clockwise as can be known, i.e. voltage-phase leading current phase place simultaneously.
By regulate the hydraulic power system relief valve make system loading by
Continuous stepless changes, to behind the voltage and current signal sampling with method disclosed by the invention in line computation ellipse figure area, angle of swing and direction, boundary rectangle area and power factor, as shown in Figure 7.
2) motor driving system is in overload overflow situation when operation, three-phase Lee Sa such as figure feature.When the overload overflow took place hydraulic system, Lee's Sa that obtains with this fusion method such as figure signature analysis result were as shown in Figure 8.The data analysis of overload test loading procedure is consistent with adding the off-load test; when arriving pressure maximum; system's generation overflow protection; make that pressure no longer continues to increase; this moment, motor load also no longer continued to increase; the also no longer notable change of pairing ellipse figure area, angle of swing and direction, boundary rectangle area and power factor, as shown in Figure 8.
3) motor driving system is when the impact load state moves, three-phase Lee Sa such as figure feature.(measured data, non-filtered is handled) as shown in Figure 9, when hydraulic system repeatedly withstood shocks load, three-phase Lee Sa the violent dancing in oval inclination angle occurred simultaneously as figure.
4) motor driving system is when phase shortage (c breaks mutually) state moves, three-phase Lee Sa such as figure feature.As shown in figure 10, when dragging motor moves (c breaks mutually) at c phase non-full-phase state, a phase voltage maximum, c is minimum mutually, and a equates that with the b phase current c phase current is zero.As seen at this moment, a phase power maximum, b takes second place mutually.
5) motor driving system is when short circuit (short circuit of a phase) state moves, three-phase Lee Sa such as figure feature.As shown in figure 11, during motor a phase short circuit operation, a phase voltage is zero, and b equates with the c phase voltage, all significantly greater than normal voltage, and a phase current maximum, b equates with the c phase current, also much larger than normal current.
Claims (4)
1. based on the hydraulic system running state on-line monitoring method of electric parameter information fusion, it is characterized in that this method adopts the non-intrusion measurement mode, use Li Sa to produce single-phase and three-phase information fusion method voltage, the current signal of drive motor stator as figure; Make full use of amplitude that electric parameter provides, phase information, alternate and phase sequence information and draw plane and three-dimensional Lee's Sa as figure, calculate electric parameter and oval each characteristic quantity relation, variation by observation ellipse figure area, shape, sense of rotation and ratio realizes running state, operating conditions, bearing power and the power match situation of transmission devices such as motor, hydraulic pressure, machinery in the motor driving system are monitored in real time, and can carry out discriminant classification to the motor in the dragging system, machinery and hydraulic fault.
2. the method for claim 1 is characterized in that, concrete steps are as follows:
1) obtains motor stator three-phase voltage u, current i dynamic simulation electrical signal simultaneously with Hall transducer, send into the A/D sampler after handling through conditioning circuit and obtain the three-phase digital electric signal
, with voltage
Be abscissa, electric current
Single-phase and the three-phase lissajous figures for the y coordinate real-time rendering;
2) single-phase electricity parameter Lee Sa such as figure fusion method:
If phase voltage, current signal are respectively
The voltage signal phase place of (1) formula is added
, promptly
Order
,
, wherein
Be the phase difference of phase current and phase voltage, cos
Be power factor;
With in (2) formula
Cancellation obtains following equation:
（3）
(4) formula track in the cartesian coordinate plane is one to be centered close to the ellipse of initial point, is called Lee's Sa such as the equation of voltage, electric current, and the planimetric map drawn of equation is called single-phase electricity parameter Lee Sa as figure thus;
3) three-phase electricity parameter Lee Sa such as figure fusion method
Equally spacedly be illustrated in the same coordinate system as figure single-phase Lee's Sa of three-phase electricity a, b, c phase, successively corresponding point among three-phase Lee Sa such as the figure is linked to each other, the boundary rectangle of while with the maximum of three-phase ellipse is benchmark, draw the boundary rectangle of three-phase ellipse, the variation of three-phase ellipse, boundary rectangle and line thereof can be monitored the running state of three phase electric machine and transmission system thereof;
Simultaneously, use symmetrical component method, with three-phase voltage, Current Decomposition is positive sequence, negative phase-sequence, zero-sequence component, during the non-ground connection of generator neutral point, zero-sequence current is zero, and under the normal condition, motor three-phase power and electric machine structure be symmetry substantially, negative sequence component is very little, and therefore Lee's Sa such as the figure that is made up of negative sequence voltage and negative-sequence current is almost a point;
Secondly, further the motor stator winding three phase circuit is decomposed under the two-phase rest frame, during the three phase circuit symmetry, pairing biphase current amplitude equates, phase phase difference 90 degree, so its Lee's Sa such as figure are the circle of a standard;
Fusion method comprehensive monitoring and analysis with above-mentioned three-phase electricity parameter obtain accurate and reliable hydraulic system state-detection and failure diagnosis information.
3. method as claimed in claim 1 or 2 is characterized in that, described Lee's Sa such as figure carry out single-phase and three-phase electricity parameter information fusion method has following three kinds of modes:
1) three-phase electricity a, b, c phase Lee's Sa such as figure are placed under the same coordinate system, and corresponding point is connected, the boundary rectangle of while with the maximum of three-phase ellipse is benchmark, draws the boundary rectangle of three-phase ellipse;
2) three-phase voltage, electric current are carried out the symmetrical component method conversion, negative sequence voltage, electric current are merged with single-phase fusion method;
3) three phase circuit is transformed under the two-phase rest frame, and merges with Li Sa such as method;
Comprised comprehensive, the effective information of running state, operating conditions, bearing power and the power match situation of transmission devices such as motor, hydraulic pressure, machinery in the motor driving system in the figure after three kinds of fusion methods merge.
4. the method for claim 1 is characterized in that, each characteristic quantity relation of described electric parameter and ellipse and motor driving system running state and oval feature magnitude relation are as follows:
1) elliptical orbit rotation direction: when the elliptical orbit rotation direction was clockwise, voltage delay was in electric current; When the elliptical orbit rotation direction was counterclockwise, voltage was ahead of electric current; For variable working condition load, when elliptical orbit rotation direction when being clockwise, asynchronous motor is a generating operation mode; When elliptical orbit rotation direction when being counterclockwise, asynchronous motor is electronic operating mode; Therefore can judge load character according to the elliptical orbit rotation direction;
2) ellipse area: can obtain ellipse area by analyzing
, wherein
Be single-phase average active power,
Be three phases active power, visible ellipse area is with the proportional variation of motor active power;
3) oval inclination angle: can obtain oval inclination angle by analyzing
, when no electrical failure, load variations is right
Influence very remarkable;
4) oval boundary rectangle: half of the length of side of boundary rectangle represented the maximum value of x axle and y axle respectively, and the maximum value of y axle is a current amplitude, and the maximum value of x axle is a voltage magnitude; Parameter by oval boundary rectangle changes the intuitively Changing Pattern of reflecting voltage, current signal amplitude; Also can obtain by analyzing
, wherein S is the motor apparen power, i.e. capacity,
Area for oval boundary rectangle; As seen the area of boundary rectangle is 2 times of the input apparen power, and promptly the area change of boundary rectangle can directly reflect the Changing Pattern of motor apparen power.
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| CN102095998A (en) * | 2010-12-14 | 2011-06-15 | 西安建筑科技大学 | Operating state online monitoring method for motor towing system based on electricity parameter information fusion |
| CN102095998B (en) * | 2010-12-14 | 2013-05-22 | 西安建筑科技大学 | Operating state online monitoring method for motor towing system based on electricity parameter information fusion |
| CN105927614A (en) * | 2016-06-01 | 2016-09-07 | 西安建筑科技大学 | Kinetic energy rigidity detection system for hydraulic equipment and graphic displaying type monitoring method |
| CN107764316A (en) * | 2016-08-23 | 2018-03-06 | Abb 瑞士有限公司 | For the system for the situation for monitoring multiple motors |
| CN111337121A (en) * | 2020-03-13 | 2020-06-26 | 沈阳科网通信息技术有限公司 | Vibration signal deviation soft measurement and correction method for motor rotating equipment |
| CN116597167A (en) * | 2023-06-06 | 2023-08-15 | 中国人民解放军92942部队 | Permanent magnet synchronous motor small sample demagnetization fault diagnosis method, storage medium and system |
| CN116597167B (en) * | 2023-06-06 | 2024-02-27 | 中国人民解放军92942部队 | Permanent magnet synchronous motor small sample demagnetization fault diagnosis method, storage medium and system |
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| CN102032242B (en) | 2013-02-20 |
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