CN102032242B - 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 State Monitoring System and fault diagnosis field, relating to a kind of operating status of hydraulic system on-line monitoring method based on the three-phase electrical 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 the 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, 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) to some extent designing and manufacturing level and the running state of consersion unit.If fully understand designing and manufacturing level and the running state of equipment, must in conjunction with the change procedure of operating mode multianalysis mechanical electronic hydraulic parameter such as electric current, voltage, vibration, power, moment of torsion, rotating speed, pressure, flow etc., mostly adopt the embedded measurement method to the observation of these dynamic parameterss.Because these parameter measurement costs are high, be difficult for obtaining, characteristic information is limited and easily disturbed, mostly belong to again non-stationary signal, use to engineering and bring a lot of difficulties, and certain limitation is arranged.
The claimant finds by long-term theory analysis and lot of experiments: in the hydraulic equipment that motor drags, because the coupling of rotor system, about the 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 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 amplitude and the phase information of motor three phase electrical parameters are merged, can not understand intuitively, comprehensively, reliably, online the running state of hydraulic equipment.
Summary of the invention
Above problem for the prior art existence, the object of the invention is to, a kind of operating status of hydraulic system on-line monitoring method based on electrical 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 operating status of hydraulic system on-line monitoring method based on electrical parameter information fusion is characterized in that, the method adopts the non-intrusion measurement mode, uses Li Sa to produce single-phase and three-phase information fusion method such as figure voltage, the current signal of drive motor stator; Take full advantage of amplitude that electric parameter provides, phase information, alternate and phase sequence information and draw plane and three-dimensional Lee's Sa such 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 the transmission devices such as motor, hydraulic pressure, machinery in the motor driving system are carried out Real-Time Monitoring, and can carry out discriminant classification to the motor in the dragging system, machinery and hydraulic fault.
Concrete steps are as follows:
1) obtains simultaneously motor stator three-phase voltage u, current i dynamic simulation electrical signal with Hall transducer, send into the A/D sampler after processing through conditioning circuit and obtain the three-phase digital electrical 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
, namely
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 such as figure thus;
3) three-phase electricity parameter Lee Sa such as figure fusion method
Equally spacedly be illustrated in the same coordinate system such as figure single-phase Lee's Sa of three-phase electricity a, b, c phase, successively point corresponding among three-phase Lee Sa such as the figure is linked to each other, simultaneously take the boundary rectangle of the maximum of three-phase ellipse as 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, be positive sequence, negative phase-sequence, zero-sequence component with three-phase voltage, Current Decomposition, when generator neutral point is ungrounded, zero-sequence current is zero, under normal circumstances, and motor three-phase power and electric machine structure almost symmetry, negative sequence component is very little, and Lee's Sa such as the figure that therefore are comprised of negative sequence voltage and negative-sequence current are almost a point;
Secondly, further the motor stator winding three phase circuit is decomposed under the two-phase rest frame, when three phase circuit was symmetrical, corresponding biphase current amplitude equated, 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 State Monitoring System 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 take the boundary rectangle of the maximum of three-phase ellipse as benchmark, draws the boundary rectangle of three-phase ellipse simultaneously;
2) three-phase voltage, electric current are carried out the symmetrical component method conversion, with single-phase fusion method negative sequence voltage, electric current are merged;
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 the 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 brings based on the motor driving hydraulic system running state on-line monitoring method of three-phase electrical parameter information fusion of the present invention is:
1, compares with Dynamic Signals such as mechanical vibration, hydrodynamic pressure and flows, amplitude and the phase place of motor stator three phase circuit and voltage signal are the most responsive to operating status of hydraulic system, contain the characteristic information that reflects motor, oil hydraulic pump and mechanical device running state, and having the 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 the transmission devices such as machinery, operating conditions, bearing power and power match situation are carried out Real-Time Monitoring, and can be to the motor in the dragging system, machinery and hydraulic fault carry out discriminant classification, for Precise Diagnosis and Energy Saving Control provide reliable basis.
3, the single-phase Lee's Sa such as the figure track rotation direction that form according to this method can be judged load characteristic, Li Sa such as the area of pictural surface be size and the Changing Pattern of reaction load power directly, according to rotation direction and the change of pitch angle rule of formed ellipse, but directly monitoring and judge the hydraulic system typical conditions such as loading, off-load, impact, overload; In addition, form Lee's Sa of three-phase voltage, electric current Lee Sa such as figure and negative sequence voltage and negative-sequence current according to this method such 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 respectively hydraulic equipment electrical failure and mechanical failure, for accurate diagnosis provides more reliably foundation.
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 certain margin of power, 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 at present visual monitoring technology can observe online the matching state of motor and load instantaneous power.Can in the hydraulic equipment running, carry out on-line monitoring and make it and motor realization Adaptive matching control strategy operating mode and load power according to this method, and then reach energy-conservation purpose, have important actual application value.
Description of drawings
Fig. 1 is based on the operating status of hydraulic system on-line monitoring method schematic diagram of electrical 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 lower negative sequence voltage electric current Lee Sa of normal operation is such as figure;
Fig. 5 is that the Lee Sa of three phase circuit under static two-dimensional coordinate system is such 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 is that hydraulic system adds the Feature change rule 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;
Lissajous figures characteristic quantity analysis result when Fig. 8 is hydraulic system generation overload overflow;
Fig. 9 is hydraulic system three-phase lissajous figures feature when repeatedly withstanding shocks load operation;
Figure 10 be 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, operating status of hydraulic system on-line monitoring method based on electrical parameter information fusion of the present invention adopts the non-intrusion measurement mode, voltage, the current signal (take no-load running voltage, current signal as reference value, getting 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 such as figure.Take full advantage of the amplitude that electric parameter provides, phase information, alternate and phase sequence information is drawn plane and three-dimensional Lee's Sa such 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 the transmission devices such as machinery, operating conditions, bearing power and power match situation are carried out Real-Time Monitoring, and can be to the motor in the hydraulic equipment, machinery and hydraulic fault carry out discriminant classification, for Precise Diagnosis and Energy Saving Control provide reliable basis.
Concrete steps are as follows:
1) sees Fig. 1, obtain simultaneously motor stator three-phase voltage u, current i analog electric signal (electric parameter) with Hall transducer, send into the six passage digital electric signals that the A/D sampler obtains three phase electrical parameters after processing through conditioning circuit
, 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
, namely
Order
,
, wherein
Be the phase difference of phase current and phase voltage, cos
Be power factor.
With in (2) formula
Cancellation obtains equation
(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 such 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 such as figure single-phase Lee's Sa of a, b, c phase, successively point corresponding among three-phase Lee Sa such as the figure is linked to each other, take the boundary rectangle of the maximum of three-phase ellipse as benchmark, draw the boundary rectangle of three-phase ellipse as shown in Figure 3 simultaneously.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, be positive sequence, negative phase-sequence, zero-sequence component with three-phase voltage, Current Decomposition, when generator neutral point was ungrounded, zero-sequence current was zero, under normal circumstances, motor three-phase power and electric machine structure almost symmetry, negative sequence component is very little, and Lee's Sa such as the figure that therefore are comprised of negative sequence voltage and negative-sequence current are 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, when three phase circuit was symmetrical, corresponding biphase current amplitude equated, 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 the optimum organization to information, reduce the uncertainty of information.
2, utilize Lee's Sa such as figure to carry out single-phase and the three-phase electrical 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, take the boundary rectangle of the maximum of three-phase ellipse as benchmark, draw the boundary rectangle of three-phase ellipse simultaneously.
2) three-phase voltage, electric current are carried out the symmetrical component method conversion, with single-phase fusion method negative sequence voltage, electric current are merged.
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 the 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 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) ellipse declining angle: can obtain ellipse declining angle by analyzing
, without electrical failure the time, load variations pair
Impact very remarkable.
4) oval boundary rectangle: half of the length of side of boundary rectangle represented respectively the maximum value of x axle and y axle, and the maximum value of y axle is current amplitude, and the maximum value of x axle is 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, namely the area change of boundary rectangle can directly reflect the variation of motor apparen power.
The above has provided motor stator three-phase voltage, the current information fusion method based on Li Sa such as figure, and has provided concrete fusion steps and computational methods, and operating status of hydraulic system and oval feature the relationship between quantities.Be applicable to on-line condition monitoring and fault diagnosis that all motors drag hydraulic system.Below provide a specific embodiment, this embodiment is the operating status of hydraulic system on-line monitoring that threephase asynchronous machine drags.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 respectively the hydraulic power system load increase and decrease that threephase asynchronous machine drags, overload overflow, impact load, 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 processed), during the hydraulic power system load increase and decrease, 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, the ellipse declining angle sense of rotation is arranged relevant with sensor, therefore sensor gain and wiring are arranged and will be immobilized in the implementation process), be that ellipse declining 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 ellipse declining 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 occured 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; so that pressure no longer continues to increase; this moment, motor load also no longer continued to increase; the also no longer notable change of corresponding 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.As shown in Figure 9 (measured data, non-filtered is processed), when hydraulic system repeatedly withstood shocks load, three-phase Lee Sa the violent dancing of ellipse declining angle occurred simultaneously such 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, dragging motor is when c phase non-full-phase state operation (c breaks mutually), and a phase voltage is maximum, and c is minimum mutually, and a phase equates that with the b phase current c phase current is zero.As seen this moment, a phase power is maximum, and 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 the b phase equates that with the c phase voltage all significantly greater than normal voltage, and a phase current is maximum, and the b phase equates with the c phase current, also much larger than normal current.
Claims (3)
1. based on the operating status of hydraulic system on-line monitoring method of electrical parameter information fusion, it is characterized in that the method adopts the non-intrusion measurement mode, use Li Sa to produce single-phase and three-phase information fusion method such as figure voltage, the current signal of drive motor stator; Take full advantage of amplitude that electric parameter provides, phase information, alternate and phase sequence information and draw plane and three-dimensional Lee's Sa such 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 motor, hydraulic pressure, mechanical transmission in the motor driving system are carried out Real-Time Monitoring, and can carry out discriminant classification to the motor in the dragging system, machinery and hydraulic fault; Concrete steps are as follows:
1) obtains simultaneously motor stator three-phase voltage u, current i dynamic simulation electrical signal with Hall transducer, send into the A/D sampler after processing through conditioning circuit and obtain three-phase digital electrical signal { u
j(n), i
j(n), (j=a, b, c; N=0,1,2...N) }, with voltage u
j(n) be abscissa, current i
j(n) be the single-phase and three-phase lissajous figures of 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
Namely
Order
Wherein
Be the phase difference of phase current and phase voltage,
Be power factor;
With the ω t cancellation in (2) formula, obtain 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 such as figure thus;
3) three-phase electricity parameter Lee Sa such as figure fusion method
Equally spacedly be illustrated in the same coordinate system such as figure single-phase Lee's Sa of three-phase electricity a, b, c phase, successively point corresponding among three-phase Lee Sa such as the figure is linked to each other, simultaneously take the boundary rectangle of the maximum of three-phase ellipse as 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, be positive sequence, negative phase-sequence, zero-sequence component with three-phase voltage, Current Decomposition, when generator neutral point is ungrounded, zero-sequence current is zero, under normal circumstances, and motor three-phase power and electric machine structure almost symmetry, negative sequence component is very little, and Lee's Sa such as the figure that therefore are comprised of negative sequence voltage and negative-sequence current are almost a point;
Secondly, further the motor stator winding three phase circuit is decomposed under the two-phase rest frame, when three phase circuit was symmetrical, corresponding biphase current amplitude equated, phase phase difference 90 degree, so its Lee's Sa such as figure are the circle of a standard;
With above-mentioned three-phase electricity parameter Lee's Sa such as figure fusion method comprehensive monitoring and analysis, obtain accurate and reliable hydraulic system state-detection and failure diagnosis information.
2. the method for claim 1 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, take the boundary rectangle of the maximum of three-phase ellipse as benchmark, draw the boundary rectangle of three-phase ellipse simultaneously;
2) three-phase voltage, electric current are carried out the symmetrical component method conversion, with single-phase fusion method negative sequence voltage, electric current are merged;
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 the running state of motor, hydraulic pressure, mechanical transmission, operating conditions, bearing power and power match situation in the motor driving system in the figure after three kinds of fusion methods merge.
3. 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 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
P wherein
pBe single-phase average active power, P is three phases active power, and visible ellipse area is with the proportional variation of motor active power;
3) ellipse declining angle: can obtain ellipse declining angle by analyzing
Without electrical failure the time, load variations is very remarkable on the impact of θ;
4) oval boundary rectangle: half of the length of side of boundary rectangle represented respectively the maximum value of x axle and y axle, and the maximum value of y axle is current amplitude, and the maximum value of x axle is 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, S
Boundary rectangleArea for oval boundary rectangle; As seen the area of boundary rectangle is 2 times of the input apparen power, and namely the area change of boundary rectangle can directly reflect the Changing Pattern of motor apparen power.
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| 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 |
| CN105927614B (en) * | 2016-06-01 | 2017-09-15 | 西安建筑科技大学 | Hydraulic test kinetic energy rigidity detection system and graphic 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 |
| 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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| US7183952B1 (en) * | 2005-10-07 | 2007-02-27 | Mitsubishi Denki Kabushiki Kaisha | Resolver |
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