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.

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.

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 discloses a permanent magnet motor structure and method capable of detecting permanent magnet demagnetization and rotor eccentricity faults. The permanent magnet motor structure comprises fault detection windings and main armature windings which are arranged in a crossed mode. The fault detection winding of each phase is only composed of one coil, and the main armature winding can beformed by connecting one or more coils in series. When the motor operates normally, the fault detection winding and the main armature winding are connected in series to perform energy conversion together; when fault detection is carried out, the fault detection winding is disconnected from the main armature winding, the permanent magnet demagnetization and rotor eccentricity conditions of the permanent magnet motor are judged by observing the back electromotive force waveform of the fault detection winding, and the fault is accurately judged. The motor is simple in structure, the fault detection method is convenient to operate, and maintainers can be helped to quickly judge the motor fault type.

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 relates to a test method capable of realizing vibration characteristics physical separation of a stator and a rotor. A reduction sleeve is additionally arranged between a motor stator and an end cover fixed with a rotor base, after the reduction sleeve is detached, the vibration physical separation between the motor stator and the rotor can be realized, therefore, the decoupling between the stator and the rotor excitation can be realized, the electromagnetic excitation, the mechanical excitation and the vibration transmissibility of the motor can be obtained by arranging proper vibration acceleration sensor, and the test of the influence of the motor stator and rotor eccentricity on the motor vibration can be implemented. The method provides necessary original parameter and vibration and noise reduction measure for the analysis of motor vibration and the motor design and provides a technical support for the development of the low noise motor.

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 relates to a bearing-free flux-switching motor magnetic circuit analysis method considering rotor eccentricity. A magnetic circuit is segmented during rotor dynamic eccentricity, a motor magnetic circuit network with rotor dynamic eccentricity is built, and the magnetic circuit network is calculated to obtain torque characteristics and suspension force characteristics of a bearing-free flux-switching motor. By means of motor magnetic circuit segmentation considering rotor eccentricity and magnetic network calculation, the torque characteristics and the suspension force characteristics of the motor are quickly obtained, and a quick means is provided for design of the bearing-free flux-switching motor and verification of control strategies.

According to a rotor eccentricity preventing structure of the invention, on a motor which comprises a stator that includes a motor housing of which an iron core that is coiled by a coil is jointed, and a rotor which comprises a permanent magnet that rotates through an electromagnetic field generated by the coil and a rotating shaft, a bearing which supports the rotor to rotate is movably mounted on the motor housing. According to the rotor eccentricity preventing structure provided by the invention, eccentricity of the motor rotor can be prevented and a clearance between the rotor and the stator is kept even when thermal expansion occurs on the rotating shaft of an axial flux motor.

The invention discloses a corrugated elastic seal and a rotary air pre-heater sealing device, which belongs to the technical field of heat exchange equipment. The corrugated elastic seal comprises a wear-resistant end (13), an elastic element (14), a fixing end (15) and a bolt hole (16), wherein the elastic element is a corrugated elastic steel sheet; the wear-resistant end is formed by clamping the friction part of the elastic element by a heat-resistant steel plate; and the fixing end is formed by clamping the fixing part of the elastic element by the heat-resistant steel plate. The rotary air pre-heater sealing device is formed by respectively mounting the corrugated elastic seal in the radial direction of the cold / hot end of a bin clapboard, the axial direction of the bin clapboard, the annular direction for the inner edge of a rotor cold / hot end and the edge of a shell cold / hot end and then is cooperated with a sector plate, an arc plate and a rotor angle steel to realize sealing. Through using the elastic seal and the elastic sealing device, the sealing can meet the irregular change of the sealing gap caused by the mushroom deformation of the rotor, the rotor eccentricity, manufacturing errors and the like.

The invention discloses a dual-periodic adjustable variable-polarity square-wave voltage type rotor ground protection method, belonging to the technical field of generator rotor ground protection. The method is characterized by adjustable square-wave voltage polarity transformation period and adjustable window period calculated by direct current component sampling. Through detecting the charge-discharge time of a generator rotor winding ground capacitor, the polarity transformation period of the injection type square-wave voltage can be adjusted, thereby avoiding the interference caused by the charge-discharge transient state of the ground capacitor. Through detecting the period of low frequency component vibration caused by generator rotor eccentricity or magnetic pole asymmetry, the window period calculated by direct current component sampling can be adjusted, thus avoiding the interference from low frequency component caused by rotor eccentricity and magnetic poles asymmetry.

The invention discloses a fuzzy neural network decoupling controller for a bearing-free permanent magnet synchronous motor. The decoupling controller is composed of a feedback linear controller and a fuzzy neural network inverse controller connected in series. The fuzzy neural network inverse controller is connected with the bearing-free permanent magnet synchronous motor in series. The input of the feedback linear controller is radial displacement specific rate [x*, y*], rotation specific rate omega*, radial displacement x, y and rotation speed omega while the output is eccentric displacement controlled quantity r and rotation speed control quantity omega c. The input of the fuzzy neural network inverse controller is eccentric angle theta, eccentric displacement control quantity r and rotation control quantity omega c while the output is torque winding three-phase current signals [ila, ilb, ilc] and suspension winding three-phase current signal [i2a, i2b, i2c]. The invention directly adopts the rotor eccentric quantity as control signals and directly adopts the eccentric displacement quantity, the rotation speed and the rotation angle as the input quantity, direct control over rotor eccentricity can be realized; a suspension force control structure is simplified; good rotor radio position and motor speed control performance can be obtained; and control efficiency is improved.

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 discloses an eccentric connecting rod type radial variable plunger pump. According to the eccentric connecting rod type radial variable plunger pump, the displacement change of the plunger pump is controlled by using an eccentric column and a connecting rod assembly, compared with a traditional radial variable plunger pump, the eccentric connecting rod type radial variable plunger pump has the advantage that the energy loss caused by friction generated by using a sliding shoe and a stator is avoided; the displacement of the plunger pump is changed by changing the pressure of external hydraulic oil, and the compression amount and elongation of the plunger pump on a rotor core are both controlled through a plunger core, so that a reset spring does not need to be placed in the plunger pump, the structure of the plunger pump is simplified, and energy consumption in the spring deformation process is avoided; and the displacement is changed by changing the eccentric distance between the eccentric column and the rotor core, and compared with a method for changing the displacement by changing the eccentric distance between the stator and a rotor in the traditional radial variable plunger pump, so that a displacement adjusting mechanism is simpler and more compact; and a special coupling capable of adapting to eccentric distance change does not need to be used between a rotor rotating shaft and a prime mover.

The invention discloses a fault monitoring method of an explosion-proof motor, which is characterized in that a light-emitting diode of a photoelectric sensor is installed on a front end cover of theexplosion-proof motor, a phototriode of the photoelectric sensor is installed on a rear end cover of the explosion-proof motor, and a light beam emitted by the light-emitting diode penetrates throughan air gap between a stator and a rotor to reach the phototriode; a detection device is adopted to judge the state signal of the phototriode and the tube voltage drop signal of the light emitting diode, and when the phototriode is in a cut-off state, the detection device outputs a rotor eccentricity early warning signal; and when the tube voltage of the light emitting diode is reduced to a specified value, the detection device outputs a high-temperature early warning signal. The method is advantaged in that the eccentric condition of the rotor is detected through light beams, the anti-interference performance is high, and when the anti-explosion motor has mechanical faults or the temperature is too high, an early warning signal can be reliably output; the fault judgment method is simple and convenient, the structure of the detection device can be greatly simplified, and popularization and application are facilitated.

The invention discloses a variable-pitch co-rotating meshing double-screw compressor rotor and a compressor. The compressor rotor comprises two rotor bodies, wherein molded lines of the two rotor bodies are of eccentric circular structures; the eccentric distances e are equal; the molded lines of the two rotor bodies are the same and are tangent; the pitch radiuses rp1 and rp2 of the two rotor bodies are equal to the radius r of the molded lines; the appearances of the two rotor bodies are formed by guiding the molded lines of the two rotor bodies through variable-pitch spiral lines; and the two rotor bodies always keep a meshing relationship when simultaneously rotating clockwise or anticlockwise around respective pitch centers at the same angular speed. The double-screw compressor comprises a machine shell and the rotor arranged in the machine shell, wherein the rotor adopts the variable-pitch co-rotating meshing double-screw compressor rotor. According to the variable-pitch co-rotating meshing double-screw compressor rotor and the compressor, the two screw rotor bodies rotate cooperatively, so that the periodic volume change of an internal working cavity can be realized, the design requirement of the internal compression ratio is met, and conveying and compression of gas are realized. The variable-pitch co-rotating meshing double-screw compressor rotor and the compressor have the advantages of being easy in processing, few in quick-wear parts, good in meshing, less in wear, low in noise, low in cost, long in service life and the like.

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.

The invention provides a motor rotor eccentric fault diagnosis method based on a fully adaptive matrix beam, which solves the shortcomings of the traditional matrix beam algorithm in the motor rotor eccentric fault diagnosis, and has dual functions of adaptive threshold truncation and adaptive fundamental wave notch filtering Effect. By calculating the maximum likelihood estimation of the singular value matrix, the singular value truncation threshold of the matrix bundle is adaptively adjusted; at the same time, the present invention utilizes the singular value matrix inside the matrix bundle to realize fully self-adaptive trapping of the fundamental wave current component. The time length of the current collected by the present invention is very short and does not need to exceed 1 second (10kHz sampling frequency), so it is suitable for applications where the motor load changes slowly; the self-adaptive notch current fundamental wave component, and the eccentricity fault diagnosis characteristic accuracy is high , there is basically no possibility of misjudgment. According to the different rotation speeds and different loads of the motor, the threshold value of the singular value matrix truncation is adaptively set, and there is no possibility of failure of the diagnosis method.