JP2017125691A - Bearing control device and bearing control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing control device that, before operation of a rotary machine including a bearing, acquires in advance a deterioration characteristic curve of the bearing in a short time, and can improve the accuracy of deterioration diagnosis of the bearing on the basis of the acquired deterioration characteristic curve of the bearing.SOLUTION: A bearing control device 1 comprises: a load generation part 18 that provides a load to a bearing 2 of a rotor being a measuring object; a deterioration characteristic information acquisition part 10 that acquires information on the characteristic of deterioration occurring with the lapse of time to the measuring object due to the load provided thereto; and a load generation part 18 that changes the load to be provided to the measuring object on the basis of the acquired deterioration characteristic information.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a bearing control device, and more particularly to a bearing control device and a bearing control system suitable for bearing deterioration control.

The bearing is a device for promoting the rotation of the rotating device. If the bearing breaks down, the operation of the rotating equipment may be stopped. Therefore, maintenance work is performed so as not to cause deterioration of the bearing.
As a technique for determining the state of the bearing, for example, a technique described in Patent Document 1 has been proposed. In Patent Document 1, an amplitude distribution waveform is obtained from a detection waveform for one rotation or one period (intermittent rotation) of measurement data obtained from a sensor (acoustic sensor, vibration sensor, ultrasonic sensor), and the amplitude distribution waveform is calculated from the amplitude distribution waveform. A configuration is disclosed in which a reference distribution waveform (estimated normalization waveform) is obtained and the state (normal / abnormal) of the bearing is determined based on the obtained reference distribution waveform and amplitude distribution waveform. A configuration in which an approximate curve is generated from the amplitude distribution waveform in a region where the amplitude is larger than the mode value Fmax, the gradient is compared with a threshold value, and the state of the bearing is determined. A configuration is described in which the area AR of a region where the frequency with the same amplitude as the waveform exceeds the predetermined reference frequency Fref is compared with a threshold to determine the state (normal / abnormal).

  Patent Document 2 discloses a ball bearing and a roller bearing. Based on measurement data from a sensor (position sensor) arranged in a radial direction orthogonal to the central axis of the rotor, the vibration vector of the rotor is calculated. An arrangement for calculating and generating a pressure vector in a direction opposite to the obtained vibration vector of the rotor is disclosed. And in patent document 2, in order to generate | occur | produce the vector of the said reverse direction, in the cross section of a bearing, the amount of lubricating oil supplied from the lubricating oil supply hole distribute | arranged to four places so that it may mutually orthogonally be controlled, A configuration for suppressing (vibrating) vibration is described.

JP 2011-252761 A Japanese Patent Laid-Open No. 2001-304342

However, Patent Document 1 merely discloses a configuration for easily determining the normality / abnormality of a bearing based on measurement data input from a sensor, and deterioration characteristic information including a change over time of a bearing to be measured. No consideration is given to (deterioration characteristic curve).
Further, Patent Document 2 only discloses a vibration damping device that suppresses vibration of the rotor, and does not take into account deterioration of the bearing that is a measurement target in the first place. No consideration is given to deterioration characteristic information (deterioration characteristic curve) including aging or aging.
Further, the deterioration characteristics of the bearing itself vary depending on the state of the lubricating oil or the operating state. Therefore, in order to estimate a highly accurate deterioration characteristic curve, it is necessary to measure operation data until failure occurs at the site where the bearing is installed. However, when the bearing is operated in a normal state without applying a load to the bearing, the bearing has a high safety factor and requires about 30 to 50 years until failure. Therefore, it is strongly desired to acquire a highly accurate deterioration characteristic curve in a short time.

  Therefore, the present invention acquires the deterioration characteristic curve of the bearing in advance in a short time before the operation of the rotating machine having the bearing, and based on the acquired deterioration characteristic curve of the bearing, improves the accuracy of the deterioration diagnosis of the bearing. Provided are a bearing control device and a bearing control system that enable the above.

In order to solve the above-described problems, a bearing control device according to the present invention includes a load generating unit that applies a load to a bearing of a rotating body that is a measurement target, and deterioration that occurs in the measurement target over time due to the given load. A deterioration characteristic information acquisition unit that acquires characteristic information, wherein the load generation unit changes a load applied to the measurement object based on the acquired deterioration characteristic information.
In addition, a bearing control system according to the present invention includes a rotating machine having at least a rotor, a bearing that rotatably supports the rotor, and a bearing control device that controls the bearing. A load generating unit that applies a load to the bearing of the rotating body that is a target, and a deterioration characteristic information acquiring unit that acquires deterioration characteristic information generated in the measurement target over time due to the applied load, and The load generation unit changes a load applied to the measurement target based on the acquired deterioration characteristic information.

According to the present invention, since the deterioration characteristic curve of the bearing can be obtained in advance in a short time before the operation of the rotating machine having the bearing, the bearing deterioration diagnosis can be performed based on the estimated deterioration characteristic curve of the bearing. It is possible to provide a bearing control device and a bearing control system that enable accuracy.
Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

1 is a schematic overall configuration diagram of a bearing control system of Embodiment 1 according to an embodiment of the present invention. It is an AA cross-sectional arrow view of the rotating apparatus having the bearing shown in FIG. It is a functional block diagram of the bearing control apparatus shown in FIG. It is explanatory drawing of the data structure of failure mode DB shown in FIG. It is explanatory drawing of the data structure of design information DB shown in FIG. FIG. 4 is a process flow diagram of the bearing control device shown in FIG. 3. It is a deterioration characteristic curve calculation flowchart by the deterioration characteristic curve estimation part shown in FIG. It is a deterioration characteristic curve figure which shows the relationship between accumulation rotation speed and a deterioration parameter | index (effective value). FIG. 4 is a load command generated by a load command generation unit shown in FIG. 3 and shows a vibration method. It is explanatory drawing of the determination process by the determination part using a degradation characteristic curve. It is explanatory drawing of the determination process by the determination part using a degradation characteristic curve. It is a figure which shows the example of a display screen structure of the display part shown in FIG. It is a figure which shows the example of a display screen structure of the display part shown in FIG. It is a figure which shows the example of attachment at the time of using a magnetic force generation part as a load generation part shown in FIG. It is a figure which shows the state at the time of applying a load by the magnetic force generation part shown in FIG. It is a schematic block diagram at the time of applying a bearing control system to a compressor. It is a figure which shows the example of attachment of the magnetic bearing which comprises the bearing control apparatus of Example 2 which concerns on the other Example of this invention. It is a figure which shows the state at the time of applying a load with the magnetic bearing shown in FIG. FIG. 17 is an AA cross-sectional arrow view of the first magnetic bearing shown in FIG. 16. It is explanatory drawing of the data structure of design information DB.

In this specification, the “rotating device having a bearing” includes a ball bearing or a roller bearing, and an inner ring that constitutes the ball bearing or the roller bearing rotates. In the present specification, the “rotating device having a bearing” may be simply referred to as a bearing.
In the present specification, the bearing includes a magnetic bearing in addition to the above-described ball bearing and roller bearing. Further, in the present specification, the “deterioration characteristic curve” includes deterioration characteristic information including a change with time of a rotating device having a bearing.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a schematic overall configuration diagram of a bearing control system according to a first embodiment of the present invention. As shown in FIG. 1, a bearing control system 100 includes a rotating machine 4 having a rotor 3, a rotating device 2 having a bearing that rotatably supports the rotor 3, a sensor 5 attached to the rotating device 2 having a bearing, and The bearing control device 1 that acquires at least the measurement value from the sensor 5 and controls the load applied (applied) to the rotating device 2 and / or the rotor 3 having the bearing is provided. Here, the rotary machine 4 is, for example, a turbine, a generator, an electric motor, or a compressor.

  FIG. 2 shows an AA cross-sectional arrow view of the rotating device 2 having the bearing shown in FIG. As shown in FIG. 2, the rotating device 2 having a bearing includes a cylindrical inner ring 21 disposed so as to cover the outer peripheral surface of the rotor 3, covers the outer peripheral surface of the cylindrical inner ring 21, and from the outer peripheral surface of the inner ring 21. A cylindrical outer ring 22 that is concentrically spaced apart at a predetermined interval on the outer side in the radial direction, and covers the outer peripheral surface of the outer ring 22 and is arranged with a slight gap in the radial direction from the outer peripheral surface of the outer ring 22. A cylindrical housing 24 is provided. A plurality of arc-shaped deep grooves are formed on the outer peripheral surface of the cylindrical inner ring 21 at predetermined intervals in the circumferential direction. On the other hand, an arc-shaped deep groove is formed on the inner peripheral surface of the cylindrical outer ring 22 at a position facing the deep groove formed on the outer peripheral surface of the inner ring 21. That is, the deep groove formed on the outer peripheral surface of the inner ring 21 and the deep groove formed on the inner peripheral surface of the outer ring 22 are arranged so as to be aligned in the radial direction. A ball 23 is disposed between the deep groove formed on the outer peripheral surface of the inner ring 21 and the deep groove formed on the inner peripheral surface of the outer ring 22. Thereby, it is possible to receive a combined load which is a radial load, an axial load, or a combination thereof.

In the example illustrated in FIG. 2, the number of balls 23 is ten, but the number of balls 23 is not limited to ten. 2 is a deep groove ball bearing, and includes at least a slight gap between the outer peripheral surface of the outer ring 22 and the inner peripheral surface of the housing 24, and the outer peripheral surface of the rotor 3 and the inner ring 21. Lubricating oil is filled between the inner peripheral surface. Although not shown in FIG. 2, the rotating device 2 having a bearing includes a lubricating oil supply path and an oil drain for discharging (removing) the lubricating oil to the outside of the rotating device 2 having the bearing.
Further, as shown in FIG. 2, the sensor 5 a and the sensor 5 b are attached to the outer peripheral surface of the cylindrical housing 24 at positions orthogonal to each other when viewed from the axis of the rotor 3. Here, for example, a vibration sensor (acceleration pickup), an acoustic sensor, a temperature sensor, or the like is used as the sensor 5a and the sensor 5b.

FIG. 3 is a functional block diagram of the bearing control device 1 shown in FIG. In FIG. 3, the signal lines are indicated by dotted arrows. Note that the signal line may be either wired or wireless, but it is preferable that the signal line be wireless in consideration of the routing of the signal line. As shown in FIG. 3, the bearing control device 1 includes an input I / F 6 that inputs measurement values measured by the sensors 5 a and 5 b, a measurement value acquisition unit 7 that acquires measurement values via the input I / F 6, Deterioration control command generation unit 8, load command generation unit 9, deterioration characteristic curve estimation unit 10, design information DB (database) 11, failure mode DB (database) 12, deterioration characteristic curve storage unit 13, determination unit 14, display control unit 15 and an output I / F 16 are connected to each other via an internal bus 17.
Further, the bearing control device 1 receives the load command generated by the load command generation unit 9 via the output I / F 16 and outputs a load corresponding to the received load command to the rotating device 2 having a bearing and The load generating unit 18 is applied (applied) to the rotor 3. The bearing control device 1 includes a display unit 19 that displays a degradation characteristic curve (degradation characteristic information), which will be described later in detail, calculated by the degradation characteristic curve estimation unit 10 on the screen via the display control unit 15 and the output I / F 16. Prepare.

  The deterioration control command generation unit 8, the load command generation unit 9, the deterioration characteristic curve estimation unit 10, the determination unit 14, and the display control unit 15 include, for example, a ROM that stores various programs, and an arithmetic process or a program execution process. Are realized by a storage device such as a RAM for temporarily storing data and a processor such as a CPU for executing various programs stored in the ROM.

  Here, the outline | summary of operation | movement of the bearing control apparatus 1 is demonstrated. In the bearing control device 1, the load command generation unit 9 generates a load command based on the deterioration control command information issued by the deterioration control command generation unit 8, and the load corresponding to the load command is loaded by the load generation unit 18. It is applied (applied) to the rotating device 2 and / or the rotor 3 having the deterioration control of the rotating device 2 having a bearing. The state of the rotating device 2 having a bearing in a state where a load is applied (applied) is collected by the sensor 5a and the sensor 5b, and the deterioration characteristic curve estimation unit 10 measures the collected measurement values from the sensor 5a and the sensor 5b. The deterioration characteristic curve is calculated using the design information stored in the design information DB 11. The calculated deterioration characteristic curve is displayed on the screen of the display unit 19 via the display control unit 15, the internal bus 17, and the output I / F 16. Note that deterioration occurring during operation of the rotating device 2 having a bearing is assumed to be shaft misalignment, inner ring scratches, outer ring scratches, and seizure due to poor lubricating oil.

As for how to attach the load generating unit 18 to the rotating device 2 and / or the rotor 3 having a bearing, a contact type or a non-contact type can be mentioned. The bearing control device 1 can accelerate or accelerate the deterioration of the rotating device 2 having a bearing by actively applying a load to the rotating device 2 having the bearing, and can obtain a deterioration characteristic curve in a short time. Become.
Further, the determination unit 14 inputs the deterioration characteristic curve calculated in advance by the deterioration characteristic curve estimation unit 10 as described above and stored in the deterioration characteristic curve storage unit 13 and the measurement values from the sensors 5a and 5b. It is acquired via F6 and the measurement value acquisition unit 7, and the deterioration characteristic curve and the measurement value are compared, thereby diagnosing the rotating device 2 having a bearing (judgment of normality or abnormality). The determination result of the rotation unit 2 having a bearing by the determination unit 14 as normal or abnormal is, for example, notification that it is a maintenance time to be described later in detail, or when the determination result is abnormal, an abnormality has occurred. This is used for degeneration control or the like for performing control according to the state of the rotating machine 4 having the rotor 3 rotatably supported by the rotating device 2 having a bearing. Here, the degeneracy control is, for example, control for reducing the rotational speed of the rotor 3 when the rotating machine 4 is an electric motor, and when assuming a compressor connected to the rotating machine 4, the rotation control is performed. For example, the number is the same and the pressure is reduced (the amount of compression is reduced).

For example, a magnetic force generator, a heating wire, or an oil drain that removes lubricating oil is used as the load generator 18.
When a magnetic force generation unit is used as the load generation unit 18, the rotation of the rotor 3 can be nonuniformly rotated from a constant speed rotation using the property of magnetic force. As a result, a load can be applied to the rotating device 2 having a bearing, and the degree of acceleration of deterioration can be controlled. In addition, by using the magnetic force generation unit as the load generation unit 18, a failure mode load such as a misalignment of the rotor 3 with respect to the rotating device 2 having a bearing and a temperature increase due to non-uniform rotation of the rotor 3 may be given. It becomes possible. As a method of applying the load, by generating a magnetic force at the magnetic force generation unit, the load is applied so that the rotating device 2 having the bearing is burdened as compared with that during normal operation. Furthermore, by changing the magnetic force of attraction (0.0001T to 0.0002T) or alternately repeating the presence / absence of magnetic force generation, the rotating device 2 having a bearing vibrates. In other words, by using the magnetic force generation unit as the load generation unit 18, it functions as an excitation unit that applies vibration to the rotating device 2 having a bearing.

Moreover, when using a heating wire as the load generation part 18, the temperature rises by energizing the heating wire attached to the rotating device 2 having the bearing, thereby configuring the rotating device 2 having the bearing shown in FIG. Thus, a slight gap between the outer peripheral surface of the outer ring 22 and the inner peripheral surface of the housing 24 and the lubricating oil filled between the outer peripheral surface of the rotor 3 and the inner peripheral surface of the inner ring 21 are heated, and deterioration of the lubricating oil is caused. The degree of promotion can be controlled.
Further, when an oil drain is used as the load generating portion 18, a slight gap between the outer peripheral surface of the outer ring 22 and the inner peripheral surface of the housing 24 and the rotor 3 constituting the rotating device 2 having a bearing through the oil drain. Failure mode of seizure due to reduction (insufficiency) of lubricating oil by discharging (removing) lubricating oil filled between the outer peripheral surface and the inner peripheral surface of inner ring 21 to the outside of rotating device 2 having a bearing. Can be controlled.

  In addition to the above, the load generating unit 18 also has a function of changing the rotation speed of the rotating device 2 having a bearing in response to the load command from the load command generating unit 9. For example, when the rotational speed of the rotating device 2 having the current bearing is 950 rpm, when the load generating unit 18 receives a load command for increasing the rotational speed by 50 rpm from the load command generating unit 9, the rotating device 2 having the bearing is received. The number of rotations is controlled to be 1000 rpm. In this way, the failure mode of shaft misalignment can be controlled by increasing the rotational speed.

Next, the data structures of the failure mode DB 11 and the design information DB 12 will be described.
FIG. 4 is an explanatory diagram of the data structure of the failure mode DB. As illustrated in FIG. 4, the failure mode DB 11 has a data structure in which “failure mode”, “load generation unit type”, and “load command” are associated with each other and stored in a table format.
For example, when the “failure mode” is “axis deviation”, the “load generation unit type” is “rotational speed”, and the “load command” is stored in association with “+50 rpm”. In this case, the load command generation unit 9 (FIG. 3) notifies the load generation unit 18 via the internal bus 17 and the output I / F 16 as “load the rotation speed of the rotating device having the bearing by 50 rpm” as a load command. Outputs a command.

  When the “failure mode” is “inner ring flaw”, the “load generation part type” is “heating (heating wire)”, and the “load command” is stored in association with “+ 3 ° C.”. In this case, the load generating unit 18 is a heating wire attached to the rotating device 2 having a bearing, and the load command generating unit 9 is connected to the heating wire that is the load generating unit 18 via the internal bus 17 and the output I / F 16. Then, a heating wire temperature command (temperature rise control command information) that “increases by 3 ° C.” is output as a load command. As described above, due to the temperature rise of the rotating device 2 having a bearing, a small gap between the outer peripheral surface of the outer ring 22 and the inner peripheral surface of the housing 24 and the space between the outer peripheral surface of the rotor 3 and the inner peripheral surface of the inner ring 21 are filled. The applied lubricating oil is heated, and the lubricating oil is deteriorated, that is, the purity of the lubricating oil is lowered.

  When the “failure mode” is “outer ring flaw”, the “load generation unit type” is “magnetic force generation”, and the “load command” is stored in association with “+ 0.0001T”. In this case, the load generator 18 is a magnetic force generator, and the load command generator 9 sends “0.0001T” as a load command to the magnetic force generator that is the load generator 18 via the internal bus 17 and the output I / F 16. Command to increase. Similarly, when the “failure mode” is “burn-in”, the “load generation unit type” is “magnetic force generation”, the “load command” is stored in association with “+ 0.0001T”, and the load command The generation unit 9 outputs a command “increase 0.0001 T” as a load command to the magnetic force generation unit that is the load generation unit 18 via the internal bus 17 and the output I / F 16.

FIG. 5 is an explanatory diagram of the data structure of the design information DB 11. As shown in FIG. 5, the design information DB 11 stores “equipment”, “type”, and “number of balls” in a table format in association with each other as information at the time of designing the rotating device 2 having a bearing. Data structure.
For example, when “equipment” is “bearing A”, “type” is “deep groove bearing”, and “ten” is stored in association with “10”. In this case, the bearing A is a deep groove bearing, and shows that the rotating device 2 has a bearing in which ten balls are arranged between the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring. The configuration of the bearing A corresponds to the structure shown in FIG. Further, when “equipment” is “bearing B”, “type” is “slide bearing” and “number of balls” is stored in association with “8”. That is, in the design information DB 11, the type of bearing and the number of balls are registered for each type of bearing. In the case of the rotating device 2 having a plurality of bearings, the type of bearing and the number of balls are stored for each type of bearing.

FIG. 6 shows a process flow diagram of the bearing control device 1.
As shown in FIG. 6, first, in step S11, the deterioration control command generator 8 shown in FIG. 3 accesses the design information DB 11 via the internal bus 17, and the rotating device 2 (actual machine) having the bearing is Specify the model, bearing type and number of balls. Here, it is assumed that the deep groove bearing shown in FIG. 2 is a bearing A having 10 balls. Thereafter, the degradation control command generation unit 8 accesses the failure mode DB 12 via the internal bus 17 and takes in the “failure mode”. Here, as an example, a case where the “failure mode” is “burn-in” will be described as an example.

  In step S <b> 12, the deterioration control command generation unit 8 takes in the “load generation unit type” (load mode) when the “failure mode” is “burn-in” from the failure mode DB 12. Here, “magnetic force generation”, that is, the fact that the load generating unit 18 is a magnetic force generating unit is extracted, and the deterioration control command generating unit 8 has a burn-in failure in the magnetic force generating unit as the load generating unit 18 as a deterioration control command. Output to the load command generator 9 via the internal bus 17 so as to execute the mode control. When receiving the deterioration control command, the load command generation unit 9 accesses the failure mode DB 12 via the internal bus 17, the “failure mode” is “burn-in”, and the “load generation unit type” is “magnetic force generation”. In this case, “+ 0.0001T” is extracted as the “load command”. Thereafter, the load command generation unit 9 outputs a command “increase 0.0001 T” as a load command to the magnetic force generation unit that is the load generation unit 18 via the internal bus 17 and the output I / F 16. Subsequently, measurement values are taken in at predetermined intervals from the sensor 5a and the sensor 5b attached to the rotating device 2 having a bearing via the input I / F 6 and the internal bus 17. Here, the sensor 5a and the sensor 5b are vibration sensors, and take in the acceleration amplitude value of the rotating device 2 having a bearing as a measured value. The load command generation unit 8 outputs the acceleration amplitude value captured as the measurement value to the deterioration characteristic music estimation unit 10 via the internal bus 17 together with time information.

In step S <b> 13, the deterioration characteristic curve estimation unit 10 takes in operating time information. That is, the cumulative rotational speed is acquired based on the acceleration amplitude value and time information received from the load command generation unit 8 and the rotational speed per minute of the rotating device 2 having a bearing.
In step S14, for example, the deterioration characteristic curve generation unit 10 plots an acceleration amplitude value for each constant rotation speed, and calculates a deterioration characteristic curve by connecting the plotted measurement points with a line.

  In step S <b> 15, the deterioration characteristic curve estimation unit 10 determines whether or not the equipment configured by the rotating machine 4 having the rotor 3 and the rotating device 2 having a bearing that rotatably supports the rotor 3 is stopped. As a result of the determination, if the device is stopped, the process ends. On the other hand, if the result of determination is that the device is in operation, processing returns to step S12 again, and processing from step S12 to step S15 is executed.

Next, details of the deterioration characteristic curve calculation in step S14 will be described. FIG. 7 shows a flowchart of calculating the deterioration characteristic curve by the deterioration characteristic curve estimation unit.
In step S141, the deterioration characteristic curve estimation unit 10 acquires the measurement values from the sensors 5a and 5b from the load command generation unit 8 through the internal bus 17 as described above.
In step S142, the deterioration characteristic curve estimation unit 10 extracts features from the acquired measurement values. Here, the extracted feature is, for example, the above-described acceleration amplitude value, effective value (root mean value: RMS), Mahalanobis distance obtained by performing various processes on the acceleration amplitude value, or the like.

  In step S143, the deterioration characteristic curve estimation unit 10 takes in the operation time information, obtains a distribution or arrangement having the horizontal axis as the operation time and the vertical axis as a characteristic, and stores the deterioration characteristic curve through the internal bus 17 as the deterioration characteristic curve. The data is stored in the unit 13 (S144). Note that, as described above, the cumulative rotation number may be used instead of the operation time information.

In this embodiment, the measurement is performed by the two sensors 5a and 5b. However, the present invention is not limited to this, and the number of sensors may be set as appropriate.
In addition, in step S12 of FIG. 6, the load mode may be captured by the deterioration control command generation unit 8 instead of the load command generation unit 9. Further, in step S141 in FIG. 7, the deterioration characteristic curve estimation unit 10 is configured to acquire the measurement values from the sensors 5a and 5b from the load command generation unit 8 via the internal bus 17, but the present invention is not limited thereto. It is not something that can be done. For example, the deterioration characteristic curve estimation unit 8 may be configured to acquire the sensor 5a and the measurement value by the sensor 5a via the input I / F 6 and the internal bus 17.

Hereinafter, a deterioration characteristic curve indicated by the relationship between the cumulative rotation speed and the deterioration index (effective value: RMS) will be described as an example.
FIG. 8 is a deterioration characteristic curve diagram showing the relationship between the accumulated rotational speed and the deterioration index (effective value). FIG. 8 is a deterioration characteristic curve diagram in which the horizontal axis represents the cumulative number of rotations and the vertical axis represents the deterioration index (effective value). For example, the cumulative number of rotations on the horizontal axis is 100,000 when the operation is performed for 1000 minutes at a rotation speed of 100 rpm, and is 200,000 when the operation is performed for 2000 minutes. The deterioration index (effective value) shown on the vertical axis is the effective value of the amplitude value measured by the sensors 5a and 5b, and the relationship between the calculated effective value and the deterioration index is an international standard (International Standard values are used. The degradation index is classified into three stages according to the value of the effective value. “Normal” indicates a degradation index of “1” or less, “Caution” indicates that the degradation index is greater than “1” and “2” or less, “Danger” is defined as a range where the degradation index is greater than “2”. In addition, since it depends on the cumulative rotational speed, it is necessary to consider the cumulative rotational speed. For example, it is assumed that the rotating device 2 itself having a bearing changes with time or changes with time as the cumulative number of rotations increases. When the secular change or the secular change occurs, the effective value increases. Therefore, it is necessary to take into account the cumulative rotational speed when comparing the effective values. FIG. 8 shows the result of classification into three stages of “normal”, “caution”, and “danger” in consideration of these factors.

Further, it is classified into three stages according to the cumulative number of revolutions. When the cumulative number of revolutions is “100,000 times” or less, “No Visible Image”, that is, an abnormality cannot be visually recognized, the cumulative number of revolutions is larger than “100000 times” and “200000 times”. In the following, “Visible Image”, that is, in a state where the abnormality is visible, and when the cumulative rotation number is greater than “200000 times”, “Severe Image”, that is, immediately stop the device and replace the component or replace the device itself. It is defined as a state that requires work.
By obtaining the deterioration characteristic curve shown in FIG. 8, it is possible to easily grasp the deterioration tendency of the rotating device 2 having a bearing.

In the present embodiment, the effective value of the measured amplitude value is used as the degradation index, but the present invention is not necessarily limited to this. For example, acoustic sensors may be used as the sensor 5a and the sensor 5b, and the effective value of sound pressure (db) measured by the acoustic sensor may be used as the deterioration index. Alternatively, a deterioration index may be set based on the temperature measured by the temperature sensor using a temperature sensor.
The degree of acceleration of deterioration depends on the amount of load applied to the rotating device 2 having a bearing. Therefore, it is expected that the acceleration of deterioration will be accelerated about 10 times by increasing the amount of load, and a deterioration characteristic curve is acquired in a short time. It becomes possible to do.

  FIG. 9 shows a load command generated by the load command generator 9 (FIG. 3) and shows a vibration method. For example, when a magnetic force generation unit is used as the load generation unit 18, the vibration is performed by sweeping as shown in FIG. In this case, control regarding the frequency of the magnetic force is performed so that the natural rotational frequency (natural frequency) of the rotating device 2 having a bearing is allowed to pass. For example, when the natural frequency is 1000 rpm, the magnitude of the magnetic force is controlled by performing sweep control between 980 rpm and 1020 rpm so as to pass 1000 rpm. By performing the sweep control, it is possible to apply a load to the rotating device 2 having a bearing, and to simulate “burning” or the like in the failure mode.

  FIG. 10 is an explanatory diagram of determination processing by the determination unit 14 (FIG. 3) using the deterioration characteristic curve. As shown in FIG. 10, the determination unit 14 first accesses the deterioration characteristic curve storage unit via the internal bus 17 and acquires the deterioration characteristic curve. Further, the determination unit 14 acquires measurement values obtained by the sensors 5 a and 5 b via the input I / F 6, the measurement value acquisition unit 7, and the internal bus 17. The sensor 5a and the sensor 5b here are vibration sensors, and the measurement value acquired is an amplitude value. The determination unit 14 collates the acquired measurement value with the deterioration characteristic curve. In FIG. 10, the measurement values are plotted with black circles, but the measurement values here are effective values of the amplitude values. The measured value, which is the effective value of the amplitude value, is a value when the cumulative number of revolutions is 100,000, and is a value less than “1” that is a deterioration index (effective value) of the deterioration characteristic curve without exceeding the deterioration characteristic curve. For this reason, the determination unit 14 determines “normal”.

If the measured value that is the effective value of the amplitude value is between 100,000 and 200,000 accumulated rotations and exceeds the deterioration characteristic curve, the determination unit 14 determines that “Visible Image” (abnormality is detected). It is determined that it is in a visually recognizable state and requires “Caution”. In addition, for example, the measured value that is the effective value of the amplitude value is in a zone where the cumulative number of rotations is between 100,000 and 200,000 and is in a “Visible Damage” (state in which an abnormality can be visually recognized). However, when the deterioration index (effective value) is “1” or less, it is appropriate for the determination unit 14 to determine “normal”. When the measured value that is the effective value of the amplitude value is a value that exceeds the deterioration characteristic curve, it is desirable to determine that the deterioration state of the rotating device 2 having the bearing is the state of the corresponding zone.
As described above, the determination result by the determination unit 14 is effective in determining whether maintenance (maintenance inspection) is necessary or not.

  Further, if the accumulated rotational speed is 100,000 times and the measured value that is the effective value of the amplitude value is smaller than the deterioration index (effective value) of the deterioration characteristic curve, the cumulative rotational speed is further 100,000 to 200,000 times. When calculating the deterioration characteristic curve during the period, the following process may be performed. When a magnetic force generation unit is used as the load generation unit 18, a deterioration characteristic curve is calculated after once increasing the deterioration index (effective value). Specifically, the load command generation unit 9 outputs, for example, a load command that increases from 0.001T to 0.002T to the magnetic force generation unit that is the load generation unit 18. 6 and FIG. 7 is executed by the deterioration characteristic curve estimation unit 10, the deterioration characteristic curve can be calculated when the cumulative rotational speed is between 100,000 and 200,000 times.

  FIG. 11 is an explanatory diagram of determination processing by the determination unit 14 using the deterioration characteristic curve. The example shown in FIG. 11 represents the case where the measured value, which is the effective value of the amplitude value when the cumulative number of revolutions is 100,000, exceeds the deterioration characteristic curve. In this case, the determination unit 14 determines that it is not necessary to immediately stop the rotating device 2 having the bearing, although it is described as “Caution” and “No Visible Damage” (a state in which an abnormality cannot be visually recognized). . In the example shown in FIG. 11, the measured value that is the effective value of the amplitude value at the time when the cumulative number of revolutions is 100,000 is the same as the deterioration index (effective value) as in the case of the cumulative number of revolutions of 150,000 in the deterioration characteristic curve. is there. In this situation, when calculating the deterioration characteristic curve when the cumulative rotational speed is between 100,000 times and 200,000 times, first, the load is reduced by using the magnetic force generation part which is the load generation part 18, and the rotation having the bearing is performed. The apparatus 2 is rotated until the cumulative number of revolutions reaches 150,000 times. Then, deterioration is accelerated using a magnetic force generation part. Here, as a method of reducing the load than usual, the magnetic force from the magnetic force generator is applied in the direction of repulsion so that the load is reduced when the rotating device 2 having the bearing is rotated, and the deterioration index (effective value) is constant. When this value is exceeded, the magnetic force generator is controlled to accelerate the deterioration of the rotating device 2 having a bearing.

  FIG. 12 is a diagram showing a display screen configuration example of the display unit 19, and is a display screen example in the state shown in FIG. As shown in FIG. 12, the display screen 30 of the display unit 19 does not display a measured value that is an effective value of an amplitude value together with a deterioration characteristic curve that indicates a relationship between the accumulated rotational speed and the deterioration index (effective value). A display area 31, a second display area 32 for displaying a determination result by the determination unit 14, and an area for displaying a “read” button 33 and a “determination” button 34 for inputting various commands (hereinafter, command input) (Referred to as a region). In the uppermost area on the display screen 30, the entire window in which the first display area 31 and the second display area 32 are displayed is closed, reduced / enlarged, and displayed on the control bar of the display unit 19. A button for designating movement or the like is displayed.

As shown in FIG. 12, the cursor is moved onto a “read” button 33 by an input unit such as a mouse (not shown) by the user, and when clicked, the “read” button 33 is activated. In response to this, the display control unit 15 (FIG. 3) accesses the deterioration characteristic curve storage unit 13 via the internal bus to acquire the deterioration characteristic curve, and the amplitude value that is a measurement value by the sensor 5a and the sensor 5b is obtained. The deterioration characteristic curve acquired together with the effective value is displayed in the first display area 31.
In addition, when the user moves the cursor onto the “determination” button 34 by an input unit such as a mouse and clicks the “determination” button 34, the “determination” button 34 becomes active. Corresponding to this, as described in FIG. 10, the determination unit 14 executes the determination process, and the display control unit 15 indicates that the determination result by the determination unit 14 is “normal, especially, there is no need for maintenance at present”. Is displayed in the second display area 32. Thereby, the user can easily grasp the deterioration state of the rotating device 2 having the bearing.

  FIG. 13 is a diagram showing a display screen configuration example of the display unit 19, and is a display screen example in the state shown in FIG. 11. As shown in FIG. 13, the display screen 30 of the display unit 19 does not display the measurement value that is the effective value of the amplitude value together with the deterioration characteristic curve that indicates the relationship between the accumulated rotational speed and the deterioration index (effective value). A display area 31, a second display area 32 for displaying a determination result by the determination unit 14, and an area for displaying a “read” button 33 and a “determination” button 34 for inputting various commands (hereinafter, command input) (Referred to as a region). In the uppermost area on the display screen 30, the entire window in which the first display area 31 and the second display area 32 are displayed is closed, reduced / enlarged, and displayed on the control bar of the display unit 19. A button for designating movement or the like is displayed.

As shown in FIG. 13, the cursor is moved onto a “read” button 33 by an input unit such as a mouse (not shown) by the user, and when clicked, the “read” button 33 becomes active. In response to this, the display control unit 15 (FIG. 3) accesses the deterioration characteristic curve storage unit 13 via the internal bus to acquire the deterioration characteristic curve, and the amplitude value that is a measurement value by the sensor 5a and the sensor 5b is obtained. The deterioration characteristic curve acquired together with the effective value is displayed in the first display area 31.
In addition, when the user moves the cursor onto the “determination” button 34 by an input unit such as a mouse and clicks the “determination” button 34, the “determination” button 34 becomes active. In response to this, the determination unit 14 executes the determination process as described in FIG. 11, and the display control unit 15 displays the message “abnormal maintenance is necessary” as the determination result by the determination unit 14. 2 is displayed in the display area 32. Thus, the user can easily grasp the deterioration state of the rotating device 2 having the bearing, and can recognize the necessity of maintenance and the maintenance time.

  12 and 13, the second display area 32 for displaying the determination result by the determination unit 14 is displayed. However, the present invention is not limited to this. For example, it is good also as a structure which has only the 1st display area 31 which displays the degradation characteristic curve and the effective value of the amplitude value which is a measured value. Even in this case, the user can easily grasp the deterioration state of the rotating device 2 having the bearing.

  FIG. 14 is a diagram illustrating an example of attachment when a magnetic force generation unit is used as the load generation unit 18. As shown in FIG. 14, four magnetic force generators 18 a are arranged on one end side of the rotor 3 with respect to the rotating device 2 having a bearing that rotatably supports the rotor 3. FIG. 15 is a diagram showing a state in which a load is applied by the magnetic force generator 18a shown in FIG. As shown in FIG. 15, for example, by generating a magnetic force from only one magnetic force generation unit 18 a among the four magnetic force generation units 18 a, an unbalance is generated in the magnetic force acting on the rotor 3, and the failure mode Of these, a state of simulating the axis deviation is assumed. This makes it possible to calculate a deterioration characteristic curve after occurrence of unbalance.

  FIG. 16 is a schematic configuration diagram when the bearing control system is applied to a compressor. As shown in FIG. 16, the rotating machine 4 which is an electric motor includes a rotating device 2 having a bearing embedded in the rotating machine 4, a rotor 3 rotatably supported by the rotating device 2 having a bearing, and an outer periphery of the rotor 3. A magnetic force generator 18a and a sensor 5 are provided on the surface spaced apart from each other at a predetermined interval. A belt 41 that transmits the rotational driving force of the rotor 3 of the rotating machine 4 that is an electric motor to the compressor 40 is provided. The measurement value from the sensor 5 is input to the bearing control device 1, and a load command is transmitted from the bearing control device 1 to the magnetic force generation unit 18a. The magnetic force generator 18a generates a magnetic force in response to the load command, thereby accelerating the deterioration of the rotating device 2 having the bearing and obtaining the deterioration characteristic curve of the rotating device 2 having the bearing as described above. It becomes possible.

According to this embodiment, since the deterioration characteristic curve of the bearing can be obtained in a short time before the operation of the rotary machine having the bearing, the deterioration diagnosis of the bearing is performed based on the estimated deterioration characteristic curve of the bearing. It is possible to provide a bearing control device and a bearing control system that enable high accuracy.
In addition, according to the present embodiment, since the deterioration related to the bearing can be accelerated in a short time, a deterioration characteristic curve can be obtained before the product is operated. Further, the time for measuring the bearing data can be shortened, and the deterioration diagnosis can be performed using the deterioration characteristic curve calculated based on the measured data.

  Further, according to the present embodiment, the determination unit constituting the bearing control device displays a message indicating whether the bearing is normal or abnormal and whether maintenance is necessary based on the deterioration characteristic curve and the measured bearing data. Therefore, the user can easily grasp the deterioration state of the rotating device 2 having the bearing, and can recognize the necessity of maintenance and the maintenance time.

  FIG. 17 is a diagram showing an example of mounting a magnetic bearing constituting the bearing control device of the second embodiment according to another embodiment of the present invention. In the present embodiment, the first magnetic bearing and the second magnetic bearing that rotatably support the rotor 3 are provided, and at least one of the magnetic bearings functions as a load generating unit that promotes deterioration of the magnetic bearing. And different. Other configurations are the same as those of the first embodiment, and the same reference numerals are given to the same components as those of the first embodiment, and the description overlapping with the first embodiment is omitted.

As shown in FIG. 17, the bearing control device of this embodiment includes a first magnetic bearing 2 a and a second magnetic bearing 2 b that are arranged on both sides in the longitudinal direction of the rotor 3 provided in the rotating machine 4. A sensor 5 is attached to each of the first magnetic bearing 2a and the second magnetic bearing 2b. Here, as the sensor 5, for example, a vibration sensor (acceleration pickup), an acoustic sensor, a temperature sensor, or the like is used.
18 is a diagram showing a state when a load is applied by the magnetic bearing shown in FIG. In FIG. 18, by controlling the current value applied to a coil (not shown) of the first magnetic bearing 2 a and / or the second magnetic bearing 2 b, the magnetic force acting on the rotor 3 is unbalanced, A state in which an axis deviation has occurred is shown. As a result, for the first magnetic bearing 2a and the second magnetic bearing 2b, for example, the degree of acceleration of deterioration corresponding to “burn-in” of the “failure mode” stored in the failure mode DB 12 described in the first embodiment is set. Can be controlled.

FIG. 19 is an AA cross-sectional arrow view of the first magnetic bearing 2a shown in FIG. As shown in FIG. 19, the first magnetic bearing 2a has a coil 51a wound around, an iron core extending from the inner peripheral surface of the cylindrical housing 24 toward the rotor 3 arranged in the center, and a coil 51ba. A first pole formed by a pair of iron cores wound and extending toward the inner peripheral rotor of the housing 24 is provided. Similarly, the second pole formed by a pair of an iron core around which the coil 52a is wound and an iron core around which the coil 52b is wound, and an iron core around which the coil 53a is wound and the coil 53b are wound. And a fourth pole formed by a pair of an iron core around which the coil 54a is wound and an iron core around which the coil 54b is wound. When the current I _A is supplied to the first pole coil 51a and the coil 51b, a magnetic path through which the magnetic flux passes through the housing 24, the two iron cores, the air gap, and the rotor 3 is formed as indicated by dotted lines. It magnetic path is formed by passing a current I _B to similarly coil 52a and the coil 52b for the second pole, the magnetic path by energizing the electric current I _C into Likewise coil 53a and the coil 53b is also the third pole There is formed, a magnetic path is formed by passing a current I _D to similarly coil 54a and the coil 54b goes for the quadrupole. The first magnetic bearing 2a and the second magnetic bearing 2b are radial magnetic bearings.

Further, as shown in FIG. 19, the sensor 5 a and the sensor 5 b are attached to the outer peripheral surface of the cylindrical housing 24 at positions orthogonal to each other when viewed from the axial center of the rotor 3.
The load command generator 9 constituting the bearing control device 1 shown in FIG. 3 generates a load via the internal bus 17 and the output I / F 16 using, for example, the current command values of the currents I _{A to ID} as load commands. It outputs to the 1st magnetic bearing 2a which also has a function as the part 18. FIG. As a result, an unbalance of the magnetic force acting on the rotor 3 is generated, and the rotor 3 is inclined, so that the state shown in FIG.

FIG. 20 is an explanatory diagram of the data structure of the design information DB. As shown in FIG. 20, the design information DB 11 has a data structure in which “device”, “type”, and “number of poles” are associated with each other and stored in a table format as information at the time of designing a magnetic bearing. Have.
For example, when “equipment” is “bearing C”, “type” is “suction”, and “number of poles” is stored in association with “8” poles. When “device” is “bearing D”, “type” is “magnetic force generation”, and “number of poles” is stored in association with “4” poles.

  The operations of the deterioration control command generation unit 8, the deterioration characteristic curve estimation unit 10, the determination unit 14, and the like are the same as those in the first embodiment.

  In the present embodiment, the shape of the housing 24 is a cylindrical shape, but is not limited thereto, and may be a rectangular tube or the like. Although the first magnetic bearing 2a and the second magnetic bearing 2b of this embodiment are radial magnetic bearings, they may be replaced by thrust magnetic bearings.

  In the present embodiment, the first magnetic bearing 2a is configured to have a function as the load generating unit 18. However, the present invention is not limited to this, and only the second magnetic bearing 2b has a function as the load generating unit 18. It is good also as a structure to have, and it is good also as a structure to function as the load generation part 18 by cooperation of the 1st magnetic bearing 2a and the 2nd magnetic bearing 2b.

  According to the present embodiment, in addition to the effects of the first embodiment, the first magnetic bearing and the second magnetic bearing perform the function of the bearing, and the energization amount to the coil constituting at least one of the magnetic bearings is reduced. By changing, for example, the rotor can be inclined. That is, since the magnetic bearing also functions as a load generating unit, the number of parts and the size of the apparatus can be reduced compared to the configuration of the ball bearing or roller bearing and the magnetic force generating unit as the load generating unit in Example 1. It becomes possible.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.

DESCRIPTION OF SYMBOLS 1 ... Bearing control apparatus 2 ... Rotating apparatus 2a which has a bearing ... 1st magnetic bearing 2b ... 2nd magnetic bearing 3 ... Rotor 4 ... Rotary machine 5, 5a, 5b ... Sensor 6 ... Input I / F
7 ... Measured value acquisition unit 8 ... Deterioration control command generation unit 9 ... Load command generation unit 10 ... Deterioration characteristic curve estimation unit 11 ... Design information DB
12 ... Failure mode DB
13 ... Deterioration characteristic curve storage unit 14 ... Determination unit 15 ... Display control unit 16 ... Output I / F
17 ... Internal bus 18 ... Load generator 18a ... Magnetic force generator 19 ... Display 21 ... Inner ring 22 ... Outer ring 23 ... Ball 24 ... Housing 30 ... Display screen 31 ... 1st display area 32 ... 2nd display area 33 ... Read button 34 ... Determination button 40 ... Compressor 41 ... Belt 51a, 51b ... Coil 52a, 52b ... Coils 53a, 53b ... Coils 53a, 53b ... Coil 100 ... Bearing control system

Claims (14)

A load generator that applies a load to the bearing of the rotating body to be measured;
A deterioration characteristic information acquisition unit that acquires deterioration characteristic information generated in the measurement object over time due to the given load, and
The load control unit changes a load applied to the measurement object based on the acquired deterioration characteristic information. The bearing control device according to claim 1,
A measurement unit that measures the state of the measurement target to which a load is applied by the load generation unit;
A bearing control device comprising: a deterioration characteristic curve generation unit that generates a deterioration characteristic curve of the measurement object based on a time-series measurement value obtained by the measurement unit. The bearing control device according to claim 2,
A deterioration characteristic curve storage unit for storing the deterioration characteristic curve;
A bearing control device comprising: a determination unit that determines presence / absence and / or degree of abnormality of the measurement target based on a measurement value from the measurement unit and the deterioration characteristic curve. In the bearing control device according to claim 3,
A display unit;
A bearing control device comprising: a display control unit that outputs a deterioration characteristic curve stored in the deterioration characteristic curve storage unit and a current measurement value from the measurement unit to the display unit. In the bearing control device according to claim 4,
When the determination result by the determination unit is abnormal, the display control unit outputs message information indicating whether maintenance of the measurement target is necessary or not to the display unit. In the bearing control device according to claim 5,
A design information database for storing design information of the measurement object;
A failure mode database that stores at least a mode of a failure to be measured and a load command in association with each other, and
The load generation unit determines a load change amount to be applied to the measurement target with reference to the design information database and the failure mode database. The bearing control device according to claim 6, wherein
The display screen of the display unit includes a first display area for displaying a deterioration characteristic curve stored in the deterioration characteristic curve storage unit and a current measurement value from the measurement unit, a determination result by the determination unit, and the measurement target A bearing control device having a second display area for displaying message information indicating whether maintenance is required. The bearing control device according to claim 7,
The bearing control device according to claim 1, wherein the load generating unit is at least one of a magnetic force generating unit, a heating wire, and an oil drain for discharging lubricating oil. The bearing control device according to claim 7,
The measurement object and the load generating unit are magnetic bearings. A rotating machine having at least a rotor;
A bearing that rotatably supports the rotor;
A bearing control system for controlling the bearing, comprising:
The bearing control device includes:
A load generator that applies a load to the bearing of the rotating body to be measured;
A deterioration characteristic information acquisition unit that acquires deterioration characteristic information generated in the measurement object over time due to the given load,
The load generation unit changes a load applied to the measurement object based on the acquired deterioration characteristic information. The bearing control system according to claim 10,
The bearing control device includes:
A measurement unit that measures the state of the measurement target to which a load is applied by the load generation unit;
A bearing control system comprising: a deterioration characteristic curve generation unit that generates a deterioration characteristic curve of the measurement object based on a time-series measurement value obtained by the measurement unit. The bearing control system according to claim 11,
The bearing control device includes:
A deterioration characteristic curve storage unit for storing the deterioration characteristic curve;
A bearing control system comprising: a determination unit that determines presence / absence and / or degree of abnormality of the measurement target based on a measurement value from the measurement unit and the deterioration characteristic curve. The bearing control system according to claim 12,
The bearing control device includes:
A design information database for storing design information of the measurement object;
A failure mode database that stores at least a mode of a failure to be measured and a load command in association with each other, and
The load generating unit refers to the design information database and the failure mode database, and determines a change amount of a load applied to the measurement object. The bearing control system according to claim 13,
Having a display,
The display screen of the display unit includes a first display area for displaying a deterioration characteristic curve stored in the deterioration characteristic curve storage unit and a current measurement value from the measurement unit, a determination result by the determination unit, and the measurement target A bearing control system comprising a second display area for displaying message information indicating whether maintenance is required.

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