62 results about "Rotor eccentricity" patented technology

A wind generating set fault prediction method based on D-S evidence fusion is disclosed. In the method, for two kinds of signals, two support vector machines after parameter optimization are constructed, the two support vector machines are taken as two evidences, and after D-S fusion, a final prediction fault type is given. The method has advantages that (1) in a traditional vibration method, only a vibration signal is analyzed, and a neural network, a decision tree and other machine learning algorithm models are constructed according to a vibration energy characteristic vector; but the vibration signal is only observed so that some fault states can be misclassified, for instance, a bearing damage and rotor eccentricity can cause a vibration signal abnormity, and at this time, a current signal can be used to distinguish two kinds of fault states; and (2) a prediction model established in the method can be stored, historical data does not need to be repeatedly extracted and trained, and under a real-time prediction environment of a wind field, a prediction result can be quickly provided.

The invention relates to a device and a method for monitoring slow-speed and over-load rotor eccentricity image. The device consists of a standard circular component, a high-resolution camera, an image capture card and an image processing system, wherein, the standard circular component is arranged on the revolving shaft of a rotor to be tested, and the image processing system outputs a processed result. The method comprises the following steps: the standard circular component is arranged at the revolving shaft of the rotor to be tested; the high-resolution camera is arranged in the right front of the sectional plane of the standard circular component; the high-resolution camera shoots the turning standard circular component; the image capture card captures image transmitted by the high-resolution camera; and the image processing system compares the image captured by the image capture card with the image of the built-in standard component without eccentric position and counts the eccentricity of the tested rotor and the maximal eccentricity during around-turning. The device is simple in structure, the method is convenient, and the eccentricity at different positions during the around-turning of the rotor can be monitored and counted.

The invention provides a motor rotor eccentricity fault diagnosis method based on a completely self-adaptive matrix pencil, solves the defects of a conventional matrix pencil algorithm on the aspect of motor rotor eccentricity fault diagnosis, and has double effects of self-adaptive threshold truncation and self-adaptive fundamental wave trap filtering. The singular value truncation threshold of the matrix pencil is self-adaptively adjusted by calculating the maximum likelihood estimation of a singular value matrix; meanwhile, a completely self-adaptive trap fundamental wave current component can be realized by utilizing the singular value matrix in the matrix pencil. The required current acquisition time length is quite low and is less than 1 second (10kHz sampling frequency) so that the method is suitable for the application occasion of slow changing of motor loads; and self-adaptability to the trap current fundamental wave component can be realized, and precision of eccentricity fault diagnosis characteristics is high without possibility of misjudgment basically. The truncation threshold of the singular value matrix is self-adaptively set according to different rotating speed and different loads of a motor without possibility of failure of the diagnosis method.

A method to determine eccentricity of a rotor in a turbine including: collecting sensor data of rotor eccentricity for a plurality of startup operations; establishing a baseline eccentricity value using the sensor data corresponding to a selected startup operation; determining an eccentricity value using the filtered sensor data for each of a plurality of startup operations subsequent to the selected startup operation; determining a rotor eccentricity difference between the baseline eccentricity value and each of the eccentricity values for the plurality of startup operations subsequent to the selected startup operation, and reporting a rotor eccentricity condition based on the rotor eccentricity difference.

A disclosed displacement-variable impeller pump comprises an eccentric ring (2), a rotor (3) and an adjusting mechanism used for adjusting the eccentric distance between the eccentric ring (2) and the rotor (3), and is characterized in that the displacement-variable impeller pump also comprises a pilot valve (4) used for driving the adjusting mechanism to change the eccentric distance between the eccentric ring (2) and the rotor (3), and the pilot valve (4) is communicated with an oil pipe (5) via the adjusting mechanism. According to the structure of the displacement-variable impeller pump, because of the control of the pilot valve, oil pressure information is avoided from feeding back from the pump chamber, therefore the hysteresis and the error of displacement adjusting are avoided, and also the interference of the pressure dropping phenomenon at a high speed to a control system is avoided, and thus the high-speed safe pressure value cannot be improved manually and the best energy utilization rate is realized.

The invention provides a water-turbine generator-set magnetic pull force imbalance fault analysis method based on online data. The method comprises the following steps of according to an unexcited time 1X component vibration vector and an idle condition 1X component vibration vector, calculating vibration and swing variations caused by stator and rotor eccentricity before and after excitation; according to unexcited time 2X-8X component vibration vector and an idle condition 2X-8X component vibration vector, calculating vibration and swing variations generated because a rotor is not round before and after excitation; according to an unexcited time swing gap value and an idle condition swing gap value, calculating a swing gap variation generated because a stator is not round before and after excitation; according to the swing gap variation, calculating an axis offset orientation delta phi ave generated because the stator is not round before and after excitation; if deltaA1x is greater than or equal to deltaA1_1x, determining that a stator and rotor eccentricity fault exists; if deltaA2x_8x is greater than or equal to deltaA1_2x_8x, determining that an out-of-round rotor fault exists; and if delta Save is greater than or equal to deltaS1_ave, determining an out-of-round stator fault exists, wherein an out-of-round most prominent orientation of the stator is located at the delta phi ave. In the invention, according to the online data, a magnetic pull force imbalance fault can be automatically analyzed and determined in real time and an analysis and diagnosis report can be automatically generated.

The invention provides a multi-parameter regulation and control-based eccentric data processing and run-out tolerance distribution method for a single-stage part of large-scale high-speed rotary equipment. Sampling angle distribution characteristics and measurement errors of rotor circle contour measurement are analyzed, and collected circle contour data are subjected to functional filtering through a non-equal interval morphological filter; three parameter components of rotor eccentricity, sensor measuring head deviation and sensor measuring ball radius in circular contour measurement are considered, and a three-parameter circular contour measurement model is established; according to the measurement data with high filtering precision and the circular contour measurement model, the eccentric error can be accurately estimated, the objective function of the eccentric error of the measurement surface of the rotor is obtained, the probability density of the eccentric error is further obtained, the probability relation between the contact surface runout information and the eccentric error is obtained, and rotor tolerance distribution is achieved.

The invention introduces a generalized protection measurement and control device aiming at a 380V-10kV asynchronous motor, providing an integral solution integrating electromotor state monitoring, electromotor fault protection and electromotor measurement and control from the intelligent angle of the equipment. The invention provides a method for identifying the operation state of the electromotor by a conjugate character signal filter. On the basis of the infinite impulse response (IIR) filter of a sequence, the current signal of the electromotor is measured in real time, thus the variation situation of the conjugate character signal is monitored in the electromotor starting process. According to the comparison of the output conjugate character signals, faults such as broken electromotor rotor bars, rotor eccentricity and the like, can be identified, and the electromotor state is monitored in an online mode, thereby providing a preventative protection function for the electromotor. The criterion is simple to calculate and is easy to realize and has the advantage of high precision. The digital protection measurement and control function of the electromotor which is widely used at present serves as the basis, the state monitoring function can be integrated without additional external signals, and comprehensive protection is further provided for the electromotor.

The invention provides a rotor variable pump. The rotor variable pump comprises a pump body, a pump cover, an inner rotor, an outer rotor, an adjusting ring and a force application device; the adjusting ring is provided with pitch circle arc segments; matching arc segments corresponding to the pitch circle arc segments are arranged on the pump body; when the pressure in the pump body is increased, the adjusting ring rolls on the matching arc segments under the limit of the engagement relation between adjusting teeth segments and fixed teeth segments and the limit of the pitch circle arc segments and the matching arc segments of the pump body, and the adjusting ring is made to move towards an oil inlet area; when the pressure in the pump body is deceased, under the action force of the force application device, the adjusting ring rolls on the matching arc segments of the pump body under the limit of the engagement relation between the adjusting teeth segments and the fixed teeth segments and the limit of the pitch circle arc segments and the matching arc segments of the pump body, the adjusting ring is made to move towards an oil outlet area, and therefore the moving track of the adjusting ring is limited; accordingly, under the condition of certain eccentric distance of the inner and outer rotors, the eccentric position of rotation by the outer rotor around the center of the inner rotor can be changed, and the purpose of adjusting displacement of a fuel pump is achieved.

The invention discloses a method and equipment for high polymer material slope pin roller size extensional rheology plasticization transportation. By means of a stator inner hole and rotor eccentricity, pin rollers are arranged in a plurality of slope grooves distributed uniformly in a rotor along the circumference, axes of the pin rollers are parallel with the axis of the rotor, surfaces of the pin rollers are tangent to the slopes of the slope grooves, the rotor rotates under resistance of materials and slope reaction thrust of the slope groves, the pin rollers roll in a planet mode and are tangent to the inner surface of a stator, and the materials in a space defined by the stator, the rotor and the pin rollers in an enclosing mode are politicized and transported under size extensional rheology due to the fact that the size of the materials change along with the periodical change of rotation of the rotor. An equipment structural unit for achieving the method is a slope pin roller plasticization transportation unit, and the slope pin roller plasticization transportation unit can be combined with various screw rod extrusion units or various plunger injection units to form a slope pin plasticization injection device of an extruder or an injector.

The invention provides a flat wire motor stator and a flat wire motor, and the flat wire motor stator is characterized in that a plurality of stator grooves are uniformly distributed in the circumferential direction of a stator core, a stator winding is provided with three phases of windings, and each phase of winding is provided with four branches which are connected in parallel; each phase of winding is correspondingly provided with an embedding groove, the embedding groove is a part of a stator groove, and the branch winding of each phase is embedded into all the embedding grooves corresponding to each phase; each branch winding is formed by connecting a plurality of coils in series, the coils of the same branch winding correspond to different cross winding areas, overlapping areas exist among the cross winding areas corresponding to different branch windings, the spans of the coils located in the overlapping areas are different, and the coils are sleeved with one another. In the invention, the branch windings cross over all layers and all slots of a single phase, different potential differences among layers, slots and poles are avoided, circumferential and radial phase balance among multiple branches is fully realized, and branch balance and no circulating current are still ensured even under the condition of rotor eccentricity.

The invention discloses an accurate conformal mapping-based rotor eccentric analysis method. The rotor eccentric analysis method comprises the following steps of mapping a rotor eccentric surface-mounted motor air gap region to a stator and rotor concentric annular air gap region with a tooth groove by dual-linear mapping, mapping the annular air gap region with the tooth groove to a polygonal airgap region by logarithmic mapping, mapping the polygonal air gap to a rectangular air gap region by Schwarz-Christoffel, and finally, mapping the rectangular air gap region to two groove-less concentric circle air gap regions by index mapping. The electromagnetic field distribution of the groove-less concentric circle air gap regions can be calculated by black square equation, the motor air gap magnetic field distribution under original rotor eccentricity can be obtained by inverse transformation of four conformal mapping, an induction voltage and electromagnetic torque of a rotor eccentric motor are further solved, the calculation time of movable eccentricity and static eccentricity is shorter than finite element calculation time, and a forecast result is completely consistent with a finite element result.

The invention discloses an intelligent motor protection system. The intelligent motor protection system comprises a controller, an A/D module, a switching value input module, a switch-in isolation module, an isolation module, a communication module and a liquid crystal display screen, wherein the controller is connected with the A/D module, the switching value input module, the switch-in isolationmodule, the isolation module, the communication module and the liquid crystal display screen; an output voltage or current of a motor needing to be protected is connected with the A/D module; and theisolation module is connected with the current input end of the motor needing to be protected. The system provided by the invention can provide comprehensive protection control for the motor; when the motor has the problem of over-current, under-current, phase failure, stalling, short circuit, overvoltage, under-voltage, electric leakage, three-phase imbalance, overheating, grounding, bear abrasion, stator and rotor eccentricity or winding aging, an alarm is given or protection control is carried out; and the system has the advantages of being energy-saving, sensitive in action, high in accuracy, resistant to impact vibration, good in repeatability, complete in protection function, low in power consumption and the like.

The invention discloses a steam turbine generator unit rotor eccentricity and phase measuring device and method. The device comprises a key phase sensor and a shaft displacement sensor, wherein the key phase sensor and the shaft displacement sensor are respectively connected with two preposed device; the output ends of the two preposed devices are connected with data acquisition equipment, the data acquisition equipment is connected with a computer, the key phase sensor is installed beside a measuring groove in the circumferential surface of a rotor or a rotor extension shaft, a probe of the key phase sensor directly faces the measuring groove, and the shaft displacement sensor directly faces the rotor end surface of the steam turbine generator unit and is perpendicular to the rotor end surface. According to the invention, the eccentricity and phase of the rotor of the steam turbine generator can be measured, the bending condition of the rotor is mastered, and the steam turbine generator unit is guided to perform operations such as cylinder holding, unit turning and impulse starting; the rotor bending state caused by turbine water inflow, turbine generator unit shafting friction and the like can be judged, and qualitative judgment of the rotor bending degree and quantitative judgment of the circumferential position of shaft bending are achieved through accurate measurement of rotor eccentricity.

The invention provides a separated motor testing device capable of adjusting rotor eccentricity. The separated motor testing device comprises a stator supporting shell, a stator supporting base, two groups of rotor supporting assemblies, a testing assembly and a device base; the stator supporting base is fixed on the device base, a stator fixing groove is formed in the upper end part of the stator supporting base, and the stator supporting shell is detachably fixed at the groove opening of the stator fixing groove through a bolt; the left and right ends of the stator supporting base are respectively provided with a rotor supporting assembly; each rotor supporting assembly comprises an X-axis moving assembly, a Y-axis moving assembly and a rotor supporting frame; each rotor supporting frame is in transmission connection with the corresponding X-axis moving assembly and the Y-axis moving assembly, and horizontal displacement of the rotor supporting frame along the X axis and the Y axis is achieved; the testing assembly is in sensing connection with a tested motor. The invention further provides an eccentricity testing device which is flexible in eccentricity adjustment mode, high in positioning accuracy and suitable for detection of motors of various specifications.

The invention provides a large-scale high-speed rotary equipment multi-stage part rigidity prediction method based on contact area maximization testing and adjustment. According to the method, the three parameter components of the rotor eccentricity error, the sensor measuring head offset and the sensor measuring ball radius in the circular profile measurement are considered, a three-parameter circular profile measurement model is established, and the eccentricity error can be accurately estimated; according to the multistage rotor transfer relation, the offset of the contact surface between the rotors at all stages is obtained, the sectional area of the contact surface is calculated, an objective function of tensile rigidity is obtained according to a tensile rigidity formula, and multistage rotor assembly rigidity prediction of the aero-engine is achieved.

The invention discloses a linear Hall-based permanent magnet motor eccentricity diagnosis method and a detection system thereof, and belongs to the technical field of power generation, power transformation or power distribution. The method comprises the following steps: firstly, installing three linear Hall elements in a stator slot at the same space interval; secondly, converting analog signals outputted by the three-phase linear Hall element into digital signals through a digital signal processor, and converting the digital signals into orthogonal signals through linear combination; further, adopting a complex factor filter with harmonic selection capability to extract a negative sequence signal and a sideband signal from the orthogonal signal; then, adopting a synchronous reference system phase-locked loop to extract the amplitude of the negative sequence signal and the amplitude of the sideband signal as a static eccentricity indication quantity and a dynamic eccentricity indication quantity; and finally, calculating the indication quantity as a percentage representing the eccentricity degree in a digital signal processor. According to the invention, low-cost, high-compactness and high-precision rotor eccentricity detection is realized, the static eccentricity degree and the dynamic eccentricity degree are effectively distinguished, and the method can be applied to motors with various topological structures.

The invention discloses an eccentric ring, an aero-engine and an aero-engine rotor eccentricity adjusting method, relates to the field of aero-engines, and aims to improve the phenomenon of eccentricity of an extrusion oil film damper of the aero-engine. The eccentric ring comprises a wedge-shaped part and a positioning part. The wedge-shaped part is provided with a first through hole, a first surface facing a casing and a second surface facing an elastic support; and in the axial direction of the wedge-shaped part, the distances between the two ends of the first surface and the central axis of the eccentric ring are variable, and the second surface is a cylindrical surface. The wall thicknesses corresponding to different positions of the first surface are changed in the circumferential direction of the wedge-shaped part. The positioning part is provided with a second through hole and is fixedly connected or integrated with the wedge-shaped part; and the positioning part is positioned at the axial end part of the wedge-shaped part. According to the technical scheme, the eccentric phenomenon, caused by the gravity effect, of the extrusion oil film damper is reduced or even eliminated, and the extrusion oil film damper obtains an optimal vibration reduction effect.