JP2019184525A - Abnormality diagnosis method of machine device and abnormality diagnosis device - Google Patents

Abstract

To provide an abnormality diagnosis method of a machine device which suppresses an increase of a measurement equivalent cost, and can accurately diagnose an abnormality even if an influence is exerted to the measurement of an angular speed by a factor from the outside of the device, and an abnormality diagnosis device.SOLUTION: Angular speeds of a rotation part are detected in three of more measurement points Ma, Mb and Mc of the rotating part. Correction angular speeds which are corrected so that constant angular speed values of the measurement points Ma, Mb and Mc become the same are acquired from the detected angular speeds. A different of the correction angular speeds between the measurement points is acquired at each zone Wab, Wbc of the measurement points Ma, Mb and Mc, and a ratio of the difference of the correction angular speeds at each zone Wab, Wbc is relatively compared with a preset threshold, thus diagnosing an abnormality which occurs in a machine device.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an abnormality diagnosis method and an abnormality diagnosis device for a mechanical device.

  Mechanical devices such as windmills, railway vehicles, machine tools, etc. are regularly inspected to prevent problems caused by abnormalities in rotating parts. For example, wind power generators are installed in mountainous areas or on the ocean and are continuously operated over a long period of time, so the usage environment is severe. Moreover, wind power generators are often installed in places with poor traffic access, and once a failure occurs, there is a problem that requires a large amount of maintenance costs.

For this reason, various abnormality diagnosis systems for detecting an abnormality and monitoring a state by attaching a sensor to a mechanical device have been proposed (for example, Patent Documents 1 to 4).
In the abnormality diagnosis systems disclosed in Patent Documents 1 to 3, the angular velocity (rotational speed) of the input / output shaft or intermediate shaft of the mechanical device or the main shaft connected to the mechanical device is measured, and the angular velocity or each measured position of each measured position is measured. An abnormality in the mechanical device is detected from the angular velocity ratio between the two. In the abnormality diagnosis system of Patent Document 4, abnormality diagnosis is performed by vibration measurement using a vibration sensor, an ultrasonic sensor, or an AE (acoustic emission) sensor instead of the angular velocity described above.

Japanese Patent No. 5826866 Japanese Patent No. 5534875 US Patent No. 9810203 Japanese Patent No. 5419472

In general, in a mechanical device such as a transmission, when the angular velocity of the shaft changes due to a shift, the angular velocity at each measurement position temporarily varies, but converges constantly over time. However, when some abnormality occurs in the mechanical device, the torque (resistance force against rotation) in the mechanical device changes, and the time until the angular velocity fluctuation width and angular velocity become constant when the angular velocity changes compared to the normal case. The various characteristics such as change. Therefore, in the techniques of Patent Documents 1 and 2, when an angular diagnosis is made by detecting angular velocities of the input / output shafts, intermediate shafts, etc. of the mechanical device, when the input torque fluctuates due to an external factor, at each measurement position, The behavior of the angular velocity changes, causing a problem that the diagnostic accuracy is lowered.
In the technique of Patent Document 3, the time variation of the torque can be obtained by measuring the angular velocity at two positions of the mechanical device. However, from the angular speed at the two positions, the input torque is simply increased or the torque transmission is abnormal. I can't isolate it. For this reason, it may not be possible to properly diagnose the abnormality.

  Also, as in Patent Document 4, when abnormality diagnosis is performed by vibration measurement, unnecessary noise is superimposed on the measurement result because there are a large number of vibration, ultrasonic, and AE sources inside and around the mechanical device. Thus, accurate diagnosis becomes difficult. Moreover, the sensors used are expensive, and there is a disadvantage that the device cost increases.

  Therefore, the present invention provides an abnormality diagnosis method and an abnormality diagnosis device for a mechanical device that can suppress an increase in equipment cost for measurement and can diagnose an abnormality with high accuracy even if the measurement of the angular velocity is affected by an external factor. The purpose is to provide.

The present invention has the following configuration.
(1) In a mechanical device having a rotating part that is driven to rotate, a step of detecting angular velocities of the rotating part at three or more measurement points of the rotating part,
From the angular velocities detected at the measurement points, corrected angular velocities corrected so that the steady angular velocity values at the respective measurement points are the same are obtained, and the difference between the corrected angular velocities between the measurement points is determined as a section of the measurement points. A step of diagnosing an abnormality occurring in the mechanical device by comparing the ratio of the corrected angular velocity difference for each of the sections with a predetermined threshold,
An abnormality diagnosis method for a mechanical device comprising:
(2) In a mechanical device having a rotating unit that is driven to rotate, an angular velocity detecting unit that is installed at three or more measurement points of the rotating unit and detects the angular velocity of the rotating unit;
From the angular velocities detected at the measurement points, corrected angular velocities corrected so that the steady angular velocity values at the respective measurement points are the same are obtained, and the difference between the corrected angular velocities between the measurement points is determined as a section of the measurement points. An abnormality diagnosing unit for diagnosing an abnormality occurring in the mechanical device by comparing each ratio of the corrected angular velocity difference for each of the sections and a predetermined threshold;
An abnormality diagnosis device comprising:

  According to the present invention, an increase in equipment cost for measurement can be suppressed, and abnormality can be diagnosed with high accuracy even if the measurement of angular velocity is affected by factors from the outside of the apparatus.

It is a schematic block diagram of a wind power generator provided with an abnormality diagnosis device. It is explanatory drawing which shows typically the correction | amendment angular velocity in each measurement point when there is no abnormality in a main axis | shaft and a gearbox, and angular velocity increases in the state where input torque is constant. It is explanatory drawing which shows typically the correction | amendment angular velocity in each measurement point when there is no abnormality in a main axis | shaft and a gearbox, and an angular velocity increases in the state with a torque fluctuation in input torque. It is explanatory drawing which shows typically the correction | amendment angular velocity in each measurement point when there is no abnormality in a gearbox, there is abnormality in a main shaft, and angular velocity increases in the state where input torque is constant. It is explanatory drawing which shows typically the correction | amendment angular velocity in each measurement point when there is no abnormality in a main axis | shaft, there is abnormality in a gearbox, and angular velocity increases in the state where input torque is constant.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Here, although it demonstrates using a wind power generator as an example of a mechanical apparatus, this invention is not restricted to this.

FIG. 1 is a schematic configuration diagram of a wind turbine generator provided with an abnormality diagnosis device.
The wind power generator 10 includes a main shaft (rotating part) 11, a blade 13, a speed increaser 15, and a generator 17. The main shaft 11, the speed increaser 15, and the generator 17 are stored in a nacelle supported by a tower, although illustration is omitted.

  The blade 13 provided at the tip of the main shaft 11 transmits rotational torque obtained by converting from wind power to the main shaft 11. The main shaft 11 is rotatably supported by a pair of main shaft bearings 19 </ b> A and 19 </ b> B, and transmits the rotational torque generated by the blade 13 receiving wind force to the input shaft 23 of the speed increaser 15. The speed increaser 15 speeds up the rotation of the input shaft 23 and transmits it to the output shaft 25 to rotate the generator 17 via the coupling 26. The speed increaser 15 is configured by, for example, a gear speed increasing mechanism having a plurality of intermediate shafts rotatably supported by bearings.

  The generator 17 is configured by, for example, an induction generator that generates electric power by rotational torque received from the output shaft 25 of the speed increaser 15.

  An abnormality diagnosis apparatus 100 that detects and diagnoses an abnormality of the wind power generator 10 having the above-described configuration includes a plurality of encoders 31A, 31B, and 31C that are angular velocity detection units, a corrected angular velocity difference detection unit 33, and an abnormality diagnosis unit 35. Is provided.

  The encoders 31A, 31B, and 31C are installed at mutually different measurement points Ma, Mb, and Mc of the rotating unit of the wind power generator 10, and detect angular velocities (rotational speeds) of the rotating unit at the respective measuring points Ma, Mb, and Mc.

  The encoder 31A at the measurement point Ma is provided on the main shaft 11 that is a rotating part, and the encoder 31B at the measurement point Mb is provided on the input shaft 23 of the speed increaser 15 that is a rotating part. The encoder 31C at the measurement point Mc is provided on the output shaft 25 of the speed increaser 14 that is a rotating part.

  Each of the encoders 31A, 31B, and 31C includes a ring-shaped member 37 having a large number of irregularities formed along the circumferential direction and a displacement sensor 39 that detects the irregularities, and detects the angular velocity of each rotating shaft. The encoders 31A, 31B, and 31C include, for example, a magnetic ring in which S and N poles are alternately magnetized in the circumferential direction, and a magnetic sensor that detects the magnetism of the magnetic ring. Not only the detection method but also other detection methods may be used as long as the rotational position can be detected.

  In order to detect the angular velocity with high accuracy, it is preferable that the number of concavities and convexities and the number of magnetic poles of the encoder (ring-shaped member 37) are larger. A plurality of displacement sensors 39 and magnetic sensors may be attached in the circumferential direction. The measurement accuracy can be improved as the number of each arrangement increases. Note that the encoder can correct the accuracy error of the interval by signal processing if the accuracy of the interval between the unevenness and the interval between the S pole and the N pole is measured in advance. Therefore, in that case, high mechanical accuracy is not required for the encoder itself, and a relatively inexpensive one can be appropriately employed.

  The corrected angular velocity difference detection unit 33 includes the corrected angular velocity difference ωab in the section Wab between the measurement points Ma and Mb of the angular velocity measured by the encoders 31A, 31B, and 31C at the measurement points Ma, Mb, and Mc, and the measurement points Mb and Mc. And the corrected angular velocity difference ωbc in the section Wbc between the two.

  The abnormality diagnosis unit 35 is configured by a computer device including a CPU, a memory, an interface, and the like. The abnormality diagnosis unit 35 obtains a corrected angular velocity difference ratio R (corrected angular velocity difference ratio R = ωab / ωbc) between the corrected angular velocity difference ωab calculated by the corrected angular velocity difference detection unit 33 and the corrected angular velocity difference ωbc. Then, the calculated corrected angular velocity difference ratio R is compared with a corrected angular velocity difference ratio Rc, which is a predetermined threshold value, and it is diagnosed that an abnormality has occurred in the wind turbine generator 10. The corrected angular velocity difference ratio Rc of the threshold value may be divided by a variable of the corrected angular velocity difference, and may be a different threshold value for each section depending on the structure of the mechanical device. In addition, the abnormality diagnosis unit 35 determines that an abnormality has occurred when it deviates from the threshold range by using the characteristic that changes in magnitude depending on the occurrence location of the abnormality, and estimates the occurrence location based on the direction of increase (decrease or decrease). It is also possible to do.

Next, the procedure of abnormality diagnosis by the abnormality diagnosis apparatus 100 having the above configuration will be described.
<Basic characteristics when there is no abnormality>
FIG. 2 shows the measurement of the angular velocity ωa at the measurement point Ma, the angular velocity ωb at the measurement point Mb, and the measurement when the input angular velocity is increased while the main shaft 11 and the speed increaser 15 shown in FIG. It is explanatory drawing which showed typically the time change of angular velocity (omega) c of the point Mc. In the figure, the angular velocities ωb and ωc are corrected to be the same as the angular velocities ωa with reference to the angular velocities ωa before the change. That is, correction is performed so that the angular velocities ωa, ωb, and ωc in the steady state in which the constant speed state is achieved are the same. Similarly in FIGS. 3 to 5 described below, the vertical axis indicates the corrected angular velocity.

  In the case shown in FIG. 2, with the increase in the angular velocity ωa at the measurement point Ma, the angular velocity ωb at the measurement point Mb has a slight delay ΔTab1 from the angular velocity ωa. Further, the angular velocity ωc at the measurement point Mc has a slight delay ΔTbc1 from the angular velocity ωb. That is, as the angular velocity ωa increases, the angular velocities ωb and ωc have a slight delay and increase almost without delay.

  FIG. 3 shows the angular velocity ωa at the measurement point Ma, the angular velocity ωb at the measurement point Mb, and the measurement point Mc when the input angular velocity increases in a state where the main shaft 11 and the speed increaser 15 are not abnormal and there is torque fluctuation (increase). It is explanatory drawing which showed typically the time change of angular velocity (omega) c.

  In the case shown in FIG. 3, as the angular velocity ωa at the measurement point Ma increases, the measurement point Mb has a delay ΔTab2 from the timing at which the angular velocity ωa reaches a steady state due to torsion of the main shaft 11 accompanying torque fluctuation. As a result, the angular velocity ωb reaches a steady state. At the measurement point Mc, the angular velocity ωc reaches the steady state with a delay ΔTbc2 from the timing at which the angular velocity ωb reaches the steady state due to the twist of the shaft in the gearbox 15 or the deformation of the gear.

  The delay ΔTab2 is larger than the delay ΔTab1 when there is no torque fluctuation described above (ΔTab2> ΔTab1). Similarly, the delay ΔTbc2 is larger than the delay ΔTbc1 when there is no torque fluctuation described above (ΔTbc2> ΔTbc1). It is.

  In this configuration, the corrected angular velocity difference between the angular velocities is calculated by the encoders 31A, 31B, and 31C. However, in order to simplify the description, here, the illustrated delays ΔTab1 and ΔTab2 are parameters corresponding to the corrected angular velocity difference ωab, and The delays ΔTbc1 and ΔTbc2 will be described as parameters corresponding to the corrected angular velocity difference ωbc.

  As described above, when there is no abnormality in both the main shaft 11 and the speed increaser 15, the relationship between the delays ΔTab1 and ΔTbc1 of the angular velocities ωb and ωc is constant, and even when there is the torque fluctuation described above, the delay ΔTab2 The relationship with ΔTbc2 is constant. That is, the relationship between the corrected angular velocity difference ωab and the corrected angular velocity difference ωbc is constant.

  The delays ΔTab2 and ΔTbc2 when there is torque fluctuation are larger than the delays ΔTab1 and ΔTbc1 when there is no fluctuation, but in this case, the relationship of ΔTab1: ΔTbc1 = ΔTab2: ΔTbc2 is maintained in any section. That is, the relationship between the corrected angular velocity difference ωab and the corrected angular velocity difference ωbc is constant.

Here, the diagnosis procedure will be described in the case where there is no torque fluctuation shown in FIG.
The corrected angular velocity difference detection unit 33 calculates the corrected angular velocity differences ωab and ωbc in the sections of the measurement points Ma and Mb and the sections of the measurement points Mb and Mc, as indicated by the delays ΔTab1 and ΔTbc1.

  Then, the abnormality diagnosis unit 35 obtains a ratio R (= θab / θbc) between the corrected angular velocity difference ωab calculated by the corrected angular velocity difference detector 33 and the corrected angular velocity difference ωbc. Then, the obtained corrected angular velocity difference ratio R is set to a predetermined threshold corrected angular velocity difference ratio Rc (specifically, an upper limit and a lower limit of a predetermined range of the corrected angular velocity difference ratio R are set to an appropriate range in which the machine is normal). Compare with the limit value). If the corrected angular velocity difference ratio R is within a predetermined corrected angular velocity difference ratio Rc, as shown in FIG. 3, it is determined that the corrected angular velocity difference due to the generated angular velocity delay is caused by the fluctuation of the input torque. On the other hand, if the corrected angular velocity difference ratio R is outside the range of the corrected angular velocity difference ratio Rc, it is determined that the corrected angular velocity difference due to the generated angular velocity delay is caused by an abnormality in a machine such as a bearing or a gear.

<Change characteristics of angular velocity when abnormality occurs>
Next, a case where an abnormality occurs in the machine will be described.
FIG. 4 shows the angular velocity ωa at the measurement point Ma when the input angular velocity increases in the state where the speed increaser 15 shown in FIG. 1 is normal and the main shaft 11 is abnormal and there is no fluctuation (increase) in input torque. It is explanatory drawing which showed typically the time change of angular velocity (omega) b of the point Mb, and angular velocity (omega) c of the measurement point Mc.

  In the case shown in FIG. 4, as the angular velocity ωa at the measurement point Ma increases, the angular velocity ωb increases at the measurement point Mb with a larger delay ΔTab3 than when there is no abnormality. On the other hand, at the measurement point Mc, the angular velocity ωc increases with a delay ΔTbc3 (ΔTab3> ΔTbc3) when there is no abnormality as the angular velocity ωb increases.

  The abnormality diagnosing unit 35 obtains a corrected angular velocity difference ratio R of delay due to the delays ΔTab3 and ΔTbc3 and compares it with a predetermined corrected angular velocity difference ratio Rc. The abnormality diagnosing unit 35 determines, based on a relative comparison between the corrected angular velocity difference ratio R and a predetermined corrected angular velocity difference ratio Rc, whether the error has occurred due to fluctuations in the input torque or a mechanical abnormality. Here, the delay ΔTab3 (corrected angular velocity difference ωab) between the measurement points Ma and Mb is larger than the delay ΔTbc3 (corrected angular velocity difference ωbc) between the measurement points Mb and Mc, and the corrected angular velocity difference ratio R is an upper limit. The corrected angular velocity difference ratio Rc is greater than or equal to. Therefore, the abnormality diagnosing unit 35 diagnoses that an abnormality of the machine, that is, an abnormality has occurred in the main shaft 11 in the section of the measurement points Ma and Mb in which a correction angular velocity difference larger than the correction angular velocity difference when there is no abnormality is generated. Further, it is diagnosed that the section between the measurement points Mb and Mc is normal.

  In this way, by comparing the obtained corrected angular velocity difference ratio R with the corrected angular velocity difference ratio Rc that is a threshold value, whether the corrected angular velocity difference due to the angular velocity delay is caused by torque fluctuations, or whether the machine is a bearing or a gear. It is possible to determine whether it was caused by an abnormality. In addition, by providing three measurement points, it is possible to specify the cause of the abnormality and the location of the occurrence, and the diagnostic accuracy can be improved.

  FIG. 5 shows the measurement of the angular velocity ωa at the measurement point Ma when the input angular velocity is increased in the state where the main shaft 11 shown in FIG. 1 is not abnormal and the speed increaser 15 is abnormal and there is no fluctuation (increase) in the input torque. It is explanatory drawing which showed typically the time change of angular velocity (omega) b of the point Mb, and angular velocity (omega) c of the measurement point Mc.

  In the case shown in FIG. 5, when the angular velocity ωa at the measurement point Ma increases, the angular velocity ωb increases at a slight delay ΔTab4 at the measurement point Mb, but at the measurement point Mc, the delay ΔTab4 increases as the angular velocity ωb increases. The angular velocity ωc increases with a larger delay ΔTbc4 (ΔTab4 <ΔTbc4).

  The abnormality diagnosing unit 35 obtains a corrected angular velocity difference ratio R of delay due to the delays ΔTab4 and ΔTbc4 and compares it with a predetermined corrected angular velocity difference ratio Rc. Here, the corrected angular velocity difference ωbc in the interval between the measurement points Mb and Mc is larger than the corrected angular velocity difference ωab in the interval between the measurement points Ma and Mb, and the corrected angular velocity difference ratio R is equal to or less than the lower limit corrected angular velocity difference ratio Rc, which is a threshold value. It becomes. Therefore, the abnormality diagnosis unit 35 diagnoses that an abnormality of the machine, that is, an abnormality has occurred in the speed increaser 15 in the section of the measurement points Mb and Mc having the larger corrected angular velocity difference. Further, it is diagnosed that the interval between the measurement points Ma and Mb is normal.

  Even in this case, as in the case shown in FIG. 4, by determining the corrected angular velocity difference ratio of the angular velocity delay in the two sections, whether the corrected angular velocity difference due to the angular velocity delay is caused by the fluctuation of the input torque, It is possible to accurately determine whether it is caused by an abnormality in a machine such as a gear. In addition, it can be reliably determined in which of the two sections the abnormality has occurred. Therefore, an accurate abnormality diagnosis can be performed.

  Especially in wind turbine generators, the angular speed and rotational torque of the rotating part vary depending on the air volume, and the diagnosis with less than two measurement points is not accurate, but there are more than three measurement points. By doing so, an accurate abnormality diagnosis becomes possible. According to this, even when rotation fluctuation or load fluctuation occurs, it is possible to accurately specify the location where the abnormality has occurred. That is, even when the input is disturbed such as torque fluctuation from the outside, the influence can be eliminated, stable and accurate diagnosis can be performed, and more accurate diagnosis can be performed.

  Further, according to this configuration, it is only necessary to use a relatively inexpensive encoder as the angular velocity detection unit, and an increase in equipment cost of the abnormality diagnosis apparatus 100 can be suppressed. For example, compared with the case of using relatively expensive detection means such as a vibration sensor, an ultrasonic sensor, and an AE sensor, a complicated signal processing technique for removing noise is not required, and the cost of the abnormality diagnosis apparatus 100 is reduced. Can be suppressed. Compared with a method of diagnosing an abnormality based on detection signals from two or less measurement points, in this configuration in which a diagnosis is made from a corrected angular velocity difference of at least two sections, it is less affected by external noise, and diagnosis The result is more reliable.

  The present invention is not limited to the above-described embodiments, and the configurations of the embodiments may be combined with each other, or may be modified or applied by those skilled in the art based on the description of the specification and well-known techniques. The invention is intended and is within the scope of seeking protection.

For example, in the above description, the measurement location is the main axis, the input axis, and the output axis, but may be the input axis, the intermediate axis, and the output axis as shown in FIG.
In the above description, the angular velocity is measured at three measurement points, and the abnormality diagnosis is performed by comparing the ratio of the corrected angular velocity difference due to the angular velocity delay in the two sections with the threshold value. That is, the abnormality diagnosis may be performed using the corrected angular velocity difference in each of three or more sections at the four abnormal measurement points.

  For example, when an abnormality diagnosis is performed by measuring angular velocities at four measurement points, an encoder 31D may be installed on an intermediate shaft (not shown) in the gearbox 15 as shown in FIG. In this case, the corrected angular velocity difference due to the angular velocity delay in the total three sections between the measurement points Ma and Mb, between the measurement points Mb and Md, and between the measurement points Md and Mc calculated by the corrected angular velocity difference detection unit 33 is obtained. By comparing the corrected angular velocity difference ratio of the corrected angular velocity difference with a predetermined threshold value, the abnormality of the wind power generator 10 can be subdivided and diagnosed in more detail.

As described above, the following items are disclosed in this specification.
(1) In a mechanical device having a rotating part that is driven to rotate, a step of detecting angular velocities of the rotating part at three or more measurement points of the rotating part,
From the angular velocities detected at the measurement points, corrected angular velocities corrected so that the steady angular velocity values at the respective measurement points are the same are obtained, and the difference between the corrected angular velocities between the measurement points is determined as a section of the measurement points. A step of diagnosing an abnormality occurring in the mechanical device by comparing the ratio of the corrected angular velocity difference for each of the sections with a predetermined threshold,
An abnormality diagnosis method for a mechanical device comprising:
According to this abnormality diagnosis method for a mechanical device, the ratio of the corrected angular velocity difference between a plurality of measurement points is relatively compared with a predetermined threshold value, thereby suppressing an increase in equipment cost for measurement from the outside of the device. Even if the measurement of the angular velocity is affected by these factors, the abnormality can be diagnosed with high accuracy.

(2) In the step of diagnosing the abnormality, when it is determined that an abnormality has occurred, it is determined that an abnormality has occurred in a section on the larger side as compared with the case where the corrected angular velocity difference is not abnormal (1). An abnormality diagnosis method for a mechanical device according to claim 1.
According to this abnormality diagnosis method for a mechanical device, since a section where an abnormality has occurred can be identified, a repair location can be identified, and maintainability can be improved.

(3) In a mechanical device having a rotating unit that is driven to rotate, an angular velocity detecting unit that is installed at three or more measurement points of the rotating unit and detects the angular velocity of the rotating unit, and
From the angular velocities detected at the measurement points, corrected angular velocities corrected so that the steady angular velocity values at the respective measurement points are the same are obtained, and the difference between the corrected angular velocities between the measurement points is determined as a section of the measurement points. An abnormality diagnosing unit for diagnosing an abnormality occurring in the mechanical device by comparing each ratio of the corrected angular velocity difference for each of the sections and a predetermined threshold;
An abnormality diagnosis device comprising:
According to this abnormality diagnosis apparatus, the ratio of the corrected angular velocity difference between a plurality of measurement points is relatively compared with a predetermined threshold value, thereby suppressing an increase in equipment cost for measurement, and by factors from the outside of the apparatus. Even when the measurement of the angular velocity is affected, the abnormality can be diagnosed with high accuracy.

(4) The abnormality diagnosis device according to (3), wherein the angular velocity detection unit includes an encoder.
According to this abnormality diagnosis apparatus, since the encoder is used as the angular velocity detection unit, the abnormality diagnosis apparatus can be configured at low cost.

(5) The mechanical device is a wind power generator,
The rotating part is
A spindle to which the blade is connected;
An input shaft of a gearbox connected to the main shaft;
An output shaft of the speed increaser;
The abnormality diagnosis apparatus according to (3) or (4).
According to this abnormality diagnosis device, it is possible to diagnose the abnormality of the wind power generator with high accuracy at a low cost, hardly affected by the outside.

10 Wind power generator (mechanical device)
11 Spindle (Rotating part)
13 Blade 15 Speed increaser 23 Input shaft (rotating part)
25 Output shaft (rotating part)
31A, 31B, 31C Encoder (Angular velocity detector)
33 Correction Angular Velocity Difference Detection Unit 35 Abnormality Diagnosis Unit 100 Abnormality Diagnosis Device Ma, Mb, Mc, Md Measurement Point

Claims (5)

In a mechanical device having a rotating part that is rotationally driven, a step of detecting angular velocities of the rotating part at three or more measurement points of the rotating part,
From the angular velocities detected at the measurement points, corrected angular velocities corrected so that the steady angular velocity values at the respective measurement points are the same are obtained, and the difference between the corrected angular velocities between the measurement points is determined as a section of the measurement points. A step of diagnosing an abnormality occurring in the mechanical device by comparing the ratio of the corrected angular velocity difference for each of the sections with a predetermined threshold,
An abnormality diagnosis method for a mechanical device comprising:   2. The method according to claim 1, wherein in the step of diagnosing the abnormality, when it is determined that an abnormality has occurred, it is determined that an abnormality has occurred in a section on a larger side as compared with a case where the correction angular velocity difference is not abnormal. An abnormality diagnosis method for a mechanical device. In a mechanical device having a rotating unit that is rotationally driven, an angular velocity detecting unit that is installed at three or more measurement points of the rotating unit and detects the angular velocity of the rotating unit, and
From the angular velocities detected at the measurement points, corrected angular velocities corrected so that the steady angular velocity values at the respective measurement points are the same are obtained, and the difference between the corrected angular velocities between the measurement points is determined as a section of the measurement points. An abnormality diagnosing unit for diagnosing an abnormality occurring in the mechanical device by comparing each ratio of the corrected angular velocity difference for each of the sections and a predetermined threshold;
An abnormality diagnosis device comprising:   The abnormality diagnosis device according to claim 3, wherein the angular velocity detection unit is configured by an encoder. The mechanical device is a wind power generator,
The rotating part is
A spindle to which the blade is connected;
An input shaft of a gearbox connected to the main shaft;
An output shaft of the speed increaser;
The abnormality diagnosis apparatus according to claim 3 or claim 4 including:

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