JP2006126075A - Abnormality diagnosis method of bearing, and lubricating oil supply control method adopting the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an abnormality diagnosis method of a rotary bearing capable of detecting quickly an abnormal state caused by generation of a deformation or a crack in a preceding step of generation of a flaw or an impression on the rotary bearing regardless of the supply amount of a lubricating oil, and a constitution of a supply method of the lubricating oil based on the method. <P>SOLUTION: In this abnormality diagnosis method of the rotary bearing, sections by each numerical range are set respectively relative to the absolute value of the difference between an AE signal output and an AE signal output for realizing safe operation and the absolute value of the difference between a power consumption (W) and a power consumption for realizing the safe operation, and the kind of stage wherein a rotation is from the safe state to the dangerous state is displayed based on a numerical value by an overall rank showing the rotation state based on a rank corresponding to each section. In this supply control method of the lubricating oil, a supply time of the lubricating oil is shortened or extended respectively, in the case where the supplied lubricating oil is in a short or excessive state, determined based on the diagnosis method. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rotating bearing abnormality diagnosis method employed in a rotating device such as a machine tool, and a lubricant supply control method employing the method.

  When a bearing employed in a rotary bearing is damaged, the entire rotating device in which the rotary bearing is installed must be damaged greatly.

  In order to avoid such a state, various methods have been employed in order to detect abnormalities in the rotary bearing.

  However, as a simple method, there is a method for detecting abnormalities in a rotating bearing by listening to the abnormal sound of the bearing. It is impossible to retain records that support the accumulation of data that contributes to judgment, and there are many cases in which judgment of an appropriate lifetime is wrong.

  In the temperature sensor method by installing a thermometer on a rotary bearing, a limit temperature rise value is set for each rotary bearing, and an alarm is generated when the limit temperature rise value is exceeded.

  However, in the case of the temperature sensor method, the temperature rises after the bearing is in an abnormal state such as an overload, and it takes a certain time to detect the alarm. Then, the occurrence of an accident that the rotary bearing has already been damaged cannot be avoided.

  In the vibration sensor system by installing a vibration meter on the rotary bearing, an alarm is generated due to abnormal vibration of the rotary bearing.

  In the case of the vibration sensor method, it is possible to make a quicker situation determination than the temperature sensor method, and in the case of performing a spectrum analysis by the vibration frequency, the degree of scratches and indentations indicating the abnormality of the bearing Can be identified.

  However, in the case of the vibration sensor method, if there is no vibration, it is impossible to detect the abnormality of the rotating bearing. It cannot be generated as an alarm.

  In recent years, in an AE signal output method using an AE (Acoustic Emission) signal, a sound wave is generated when a local deformation or crack occurs in the state of the metal constituting the rotary bearing. This is superior to the vibration method in that an alarm can be generated at the stage before a scratch or indentation occurs.

  However, in the case of the AE signal method, it is very difficult to handle because the noise signal is likely to be mixed. On the other hand, when the amount of lubricating oil supplied increases, depending on how much Despite the fact that the temperature of the rotary bearing rises and the rotary bearing may be deformed or broken, the sound wave that is the premise of the alarm is caused by the viscous resistance of the lubricating oil as the lubricating oil amount increases. It has the disadvantage that it is hindered and the deformation or cracks are difficult to detect.

  As described above, the abnormality diagnosis method for the rotary bearing according to the prior art has advantages and disadvantages, and no all-round method has been proposed so far.

JP-A-9-147264 JP 2002-188411 A JP 2004-3891 A JP 2004-60457 A

  The present invention is based on the AE signal method, and immediately detects an abnormal state due to deformation or cracking in a stage before the rotary bearing generates scratches, traces, and the like. It is an object of the present invention to provide a rotating bearing abnormality diagnosis method capable of detecting an abnormal state of a rotating bearing and generating an alarm, and a configuration of a lubricating oil supply method employing the method. .

In order to solve the above problems, the basic configuration of the present invention is as follows.
(1) In the abnormality diagnosis method for rotating bearings, safe driving is realized by selecting the AE signal output (Acoustic Emission signal output) detected from the rotating bearings and the power consumption required for rotating the rotating bearings as diagnostic indicators. AE signal output (hereinafter abbreviated as “safety reference signal output”) and power consumption that can realize safe driving (hereinafter abbreviated as “safety reference power consumption”) as a reference, and a predetermined rotation The absolute value (| AW) of the difference (AE−AE ₀ : hereinafter referred to as “AE signal output difference”) between the AE signal output and the specific safety reference signal output (AE ₀ ) at the stage where the rotational operation is performed by the number. −AWE ₀ |) and the absolute value (| W−) of the difference between the power consumption (W) and the specific safety standard power consumption (W ₀ ) (W−W ₀ : hereinafter referred to as “power consumption difference”). W ₀ |) for, by the respective numerical ranges, respectively A numerical value representing the rank in which each numerical value range sequentially increases from the smaller side is set for the image and the section (however, the numerical value representing the smallest rank is the same numerical value for both AE signal output and power consumption). The absolute value of the AE signal output difference corresponding to the rank corresponding to the corresponding rank, and the numerical value indicating the rank corresponding to the absolute value of the power consumption difference corresponding to the overall rank in the rotating state In addition, the rotation based on generating a signal corresponding to a stage based on a numerical value representing a plurality of general ranks divided from the safe state to the dangerous state according to the numerical value representing the general rank. Bearing abnormality diagnosis method,
(2) After adopting the abnormality diagnosis method for the rotary bearing described in (1) above, the power consumption difference (W−W ₀ ) is positive, and as a result of diagnosis by the abnormality diagnosis method, safe operation of the rotary bearing is performed. The absolute value of the AE signal output difference (| AE−AE ₀ |) and the absolute value of the power consumption difference (| W−W ₀ |) are respectively safe driving when the vehicle does not correspond to a section that can perform the operation. The time interval for supplying the lubricating oil is expanded and the difference in power consumption (W−W ₀ ) is negative and the result of diagnosis by the abnormality diagnosis method is reached before reaching a state corresponding to a section that can be When the rotary bearing does not correspond to a section where safe operation is possible, the absolute value of the AE signal output difference and the absolute value of the power consumption difference correspond to sections where safe operation is possible. Until the above condition is reached, Supply control method of the lubricating oil which is based on small,
Consists of.

  Based on the configurations of (1) and (2), in the present invention, regardless of the amount of lubricating oil supplied, the state of safe operation is determined before the rotary bearing reaches an abnormal situation due to the occurrence of scratches or traces. It is possible to generate an alarm at a stage that exceeds, i.e., the stage of deformation or cracking of the rotary bearing, and the occurrence of an abnormal situation is detected in advance, and the supply amount of lubricating oil is reduced in response to the detection. It is possible to correct it to an appropriate amount.

  First, the technical background and basic principle of the present invention will be described.

  FIG. 3A is a graph showing the relationship between the amount of lubricating oil supplied to the rotary bearing at a predetermined rotational speed and the output of the AE signal from the rotary bearing. As shown in FIG. As the supply amount increases, the AE signal output indicating the variation state of the rotary bearing decreases due to the disturbance to the sound wave transmission due to the viscous resistance of the lubricant, and conversely, the AE signal output decreases as the lubricant supply amount decreases. Shows a tendency to grow.

  The AE signal output depends on the situation due to the deformation of the rotary bearing, the presence or absence of cracks, and the degree of noise. Therefore, as shown in FIG. It is not a one-to-one relationship.

  FIG. 3B shows the relationship between the lubricating oil supply amount and the power consumption. As shown in FIG. 3B, the viscosity resistance in the rotary bearing increases as the lubricating oil supply amount increases. Power consumption tends to increase.

  In addition, in the case of power consumption, since it is caused by a load of the rotary bearing and a friction factor other than the viscosity, there is not necessarily a one-to-one relationship with the amount of lubricating oil supplied. Since most of the electric power is consumed for rotational friction in the rotary bearing, there is a one-to-one relationship with the approximate amount of lubricating oil supplied.

  FIG. 3C shows the relationship between the AE signal output in the rotary bearing and the power consumption based on the lubricant supply amount based on the relationship between both FIG. 3A and FIG. Although the relationship is shown, the degree of AE signal output tends to decrease as the power consumption increases.

However, as is clear from FIG. 3C, it corresponds to a specific safety standard AE signal output AE ₀ corresponding to an appropriate amount of lubricating oil supply, and to the appropriate amount of lubricating oil supply. If you are certain safety standards power W ₀ is set to each outline central position, if AE signal output is greater than the AE _0, it does not mean that less than the power consumption is always the W _0, similarly AE When the signal output is smaller than the AE ₀ , the power consumption is not larger than the W ₀ , and the AE signal output and the power consumption are both larger or smaller than the AE ₀ and W ₀ , respectively. Can exist.

The specific safety standard AE signal output (AE ₀ ) and the specific safety standard power consumption (W ₀ ) can be arbitrarily selected from the safety standard AE output signal and each quantity capable of realizing the safe power consumption. However, in order to perform a relatively accurate selection, it is preferable to specify the average value of the safety standard AE signal output and the average value of the safety standard power consumption.

In the present invention, as shown in FIG. 4, the difference (AE−AE ₀ ) between the AE signal output (AE) and the specific safety standard AE signal output (AE ₀ ) at the time of a rotating operation at a predetermined number of revolutions, For the absolute value (| AE-AE ₀ |) of the absolute value (| AE signal output difference)), each section is set for each range of a predetermined size, and a numerical value according to the rank (order) for each section is set. The numerical value indicating the rank increases, for example, as 0, 1, 2,..., M, as the absolute value becomes a large range (distance away from the safety standard AE signal output (AE ₀ )). As a result, the higher the numerical value representing the rank, the greater the degree of abnormality based on the AE signal output.

That is, as shown in FIG.
α _i−1 ≦ | AE−AE ₀ | ≦ α _i (a)
For the absolute value of the AE signal output difference, the section width α _i corresponding to the numerical value i representing each rank is set, and as the numerical value i representing the rank increases, the appropriate lubricating oil This indicates that the required degree of attention or the degree of danger of the rotary bearing increases stepwise due to the distance from the quantity (the upper limit value of i is n and i = 0) In this case, the left side of the equation (a) does not exist and corresponds to a section in a normal safe state.)

Similarly, the absolute value (| W−) of the difference (W−W ₀ : hereinafter referred to as “power consumption difference”) between the power consumption (W) and the specific safety standard power consumption (W ₀ ) in the rotation operation stage. For W ₀ |), each section is set for each range of a predetermined size, the numerical value of the rank is set according to the order of each section, and the section having a large absolute value (power consumption is safety standard power consumption ( The number of ranks is increased to 0, 1, 2,..., N, for example, as the section is separated from W ₀ ). The degree of doing more will increase.

That is, as shown in FIG.
β _j−1 ≦ | W−W ₀ | ≦ β _j (b)
As for the absolute value of the power consumption difference, the partition width β _j corresponding to the numerical value j representing each rank is set, and the larger the numerical value j representing the rank, the more necessary attention based on the power consumption Or the degree of danger increases stepwise (when j = 0, there is no left side of the rank based on the equation (b), and the AE signal output is in a normal safe state. Applies to a parcel.)

  In the present invention, the AE signal output and the power consumption during the rotation operation are measured, the absolute values of the AE signal output difference and the power consumption difference are calculated, and then based on the equations (a) and (b). The numerical values i and j representing the corresponding rank are discriminated, and the smaller numerical value (equal or larger numerical value) of the i and j is used as the numerical value representing the overall rank in the rotational motion state of the rotary bearing. Set, based on the numerical value representing the overall rank, whether or not the rotating bearing is in an abnormal state (for example, whether i and j are 0) and the degree of the abnormal state (i and j are not smaller) The basic feature is that the presence or absence of a necessary caution signal or danger signal and the degree of necessary caution or danger based on the signal are clarified.

  As in (1) above, the numerical value representing the rank in the AE signal output and the minimum value of the numerical value representing the rank in power consumption are the same, but the basis for this is to calculate the numerical value representing the overall rank. This is because, in order to select a numerical value that is not smaller among the numerical values representing the ranks, the magnitude relationship cannot be compared unless the minimum values of the numerical values representing the two ranks are the same.

  As a numerical value that represents the overall rank of the rotation state, selecting a numerical value that is not smaller among the numerical values of both ranks, conversely, by selecting a numerical value that is not large, it is necessary to be careful or dangerous. While a certain rotational state can be missed, when a smaller numerical value is selected, such a miss can be avoided.

  As described above, in the present invention, not only the numerical value representing the rank of each section in the AE signal output but also the numerical value representing the rank of each section in the power consumption is used in combination, so that it is difficult to detect in the AE signal output. When the supply amount of lubricating oil is larger than the appropriate supply amount and abnormalities are likely to occur in the rotary bearing, by indicating a numerical value indicating the rank in which the applicable section in the power consumption corresponds to a caution or dangerous state As a result, regardless of the amount of lubricating oil, it is possible to reliably detect and diagnose the caution state or the dangerous state.

  The number of partitions set in accordance with the absolute value range of the AE signal output difference (m, which is the upper limit value of the numerical value i representing the rank of the equation (a)) and the number of partition regions of power consumption (of the equation (b) In many cases, n), which is the upper limit value of the numerical value j representing the rank, is the same number (when m = n), but it is not always necessary to have the same number.

  For example, in the case where there is a dangerous rotation state that cannot be detected in power consumption even though it is a dangerous state that can be detected in the AE signal output, the number of sections related to the absolute value of the AE signal output difference is the power consumption difference. It is also possible to set more than the number of partitions based on the absolute value of (m> n).

  In general, when m = n = 3 is set, it is possible to achieve both distinction of the level of caution or danger and simplicity of control.

  When each section is located on the outermost side due to the AE signal output difference and the power consumption difference, that is, the numerical value i representing the rank of the equation (a) corresponds to the absolute value m, and the numerical value j representing the rank of the equation (b). Is a stage where the probability that the rotary bearing will break is high when the rank is exceeded by selecting the case where scratches or indentations have occurred in the rotary bearing. This means that by replacing the rotary bearing before the destruction, the entire device can be prevented from being damaged due to the destruction.

The number of each section due to AE signal output difference and power consumption difference, and the width of each section, that is, the maximum value of the numerical value representing each rank and the standard value for dividing the section, use conventional rotary bearings. Based on the experience, the level of caution or the level of danger is set appropriately and recorded in the control device (actually stored in the computer memory).
In addition, since the number of each section and the width of each section may differ depending on the number of rotations of the rotary bearing, the diagnosis method of (1) described above is based on the number of rotations. It should be set for each section.

  The process of calculating the overall rank of the rotation state from the rank corresponding to each section and generating a signal at the corresponding stage is as shown in the flowchart of FIG. 5 (in FIG. 5, In the embodiment, the number of partitions related to the absolute value of the AE signal output difference is set to be larger than the number of partitions based on the absolute value of the power consumption difference, that is, an embodiment where m> n is set.

  The control method for the lubricating oil of (2) is applicable to the case where the power consumption difference is positive and the case where the power consumption difference is negative after adopting the abnormality diagnosis method for the rotary bearing of (1). In the former case, the supply amount is increased by increasing the time interval for supplying the lubricating oil, and the reduced state of the time interval is expressed as the absolute value of the AE signal output difference and the absolute value of the power consumption difference. In FIG. 4, the operation is continued until it reaches a zone where safe driving is possible (i = 0 in the equation (a) and j = 0 in the equation (b)). In the latter case, the amount of lubricating oil supplied is reduced by reducing the time interval for supplying the lubricating oil, and the expanded state of the time interval is set to the absolute value of the AE signal output difference and the absolute value of the power consumption difference. Value until reaching the safety zone (the above formula (a) Oite i = 0, and becomes to continue until the corresponding to the (b) compartments such that j = 0 in the formula).

  Therefore, in the lubricating oil supply control of (2), after a predetermined time, the absolute value of the AE signal output difference and the absolute value of the power consumption difference are calculated, and the magnitude of each absolute value is calculated. On the basis of this, the section to which the absolute value belongs is determined, and if necessary, a numerical value indicating the rank corresponding to the section is determined, and a section that allows safe driving based on the determination (the above (a It is further determined whether or not this corresponds to a section in which i = 0 in the equation (i) and j = 0 in the equation (b).

  In the method (2), the difference in power consumption, not the AE signal output difference, was selected as a criterion for determining whether to reduce or increase the time interval for supplying the lubricating oil. As is clear from the comparison with 3 (b), the power consumption reflects the lubricating oil supply amount more faithfully than the AE signal output.

As a specific method for realizing the reduction situation or the enlargement situation of (2),
(B) A method characterized by setting a specific time interval in each case where the lubricating oil supply time is extended and when the lubricating oil supply time is reduced,
(B) When extending the lubricating oil supply time, set the coefficient (c) greater than 1 and adjust the supply time by multiplying the time interval for supplying the lubricating oil in the rotational operation stage. When reducing the supply time of the lubricating oil, the coefficient (c) smaller than 1 is selected, and the supply time is adjusted by multiplying the supply time of the lubricating oil during the rotation operation. Featured methods,
Exists.

  The method (a) is characterized in that the time interval in the reduction stage and the time interval in the enlargement stage are specified, and the control when the computer is employed is simple. Is characterized in that it can be appropriately enlarged or reduced corresponding to the time interval during the rotation operation.

  In the rotational operation stage, the time interval for supplying the lubricant is digitally specified by an integer based on the number of pulses normally generated by a computer, and this point is a reduced time based on multiplying by the coefficient (c). The same is true for intervals or extended time intervals.

  Therefore, when the number of pulses corresponding to the time interval for supplying the lubricant in the previous stage where adjustment is performed is P, the coefficient c is added to the number of pulses P for the time interval corresponding to the reduced or expanded time interval. It is preferable to take measures in the computer so as to calculate an integer [Pc] (where [] represents a Gaussian symbol for representing an integer) based on the numerical value Pc obtained by multiplication.

  In the case of the method (b), a different coefficient is set for each stage corresponding to the overall rank of the rotation state determined based on the diagnosis of (1), It is also possible to adjust the time interval.

  FIG. 6 is a flowchart showing a process by the method (2) of lubricating oil supply control by the method (b), and FIG. 7 shows a process by the method (2) by the lubricating oil control method by the method (b). In the method (b), when different coefficients are set for each stage corresponding to the overall rank of the rotation state, a different coefficient (c) is set for each stage. become.

  In the lubricating oil control method of (2), the abnormal condition of the rotary bearing is detected promptly and appropriately based on the diagnostic method of (1), and the lubricating oil supply state is also promptly and appropriately determined. It becomes possible to control to.

  However, in spite of the control method of (2) above, if the rotation state is not corrected so as to correspond to a section that enables safe operation, the abnormal condition of the rotary bearing has already been corrected by the supply control of the lubricating oil. This means that it is not possible, and it is necessary to promptly replace the rotary bearing.

  Hereinafter, the lubricating oil supply control method (2) will be described with reference to examples.

  In Example 1, after adopting the method (b) shown in the flowchart of FIG. 7, as shown in FIG. 1, the rotational speed of the rotary bearing is divided into predetermined ranges according to the size, and After setting the supply time interval of the lubricating oil corresponding to the section, the lubricant is supplied so as to set the supply time interval shorter as the rotation speed of the section becomes larger.

  That is, in the first embodiment, an appropriate amount of lubricating oil is selected in accordance with each speed range, and further, appropriate lubricating oil is supplied based on the abnormality diagnosis of the rotary bearing (1). be able to.

  As shown in FIG. 1, in the first embodiment, the flowchart of FIG. 7 is adopted as a part of the process, and as shown in FIG. 7, it corresponds to a section in which a safe state of the rotary bearing is possible. Whether or not is determined is sequentially performed after a predetermined time interval, and the time interval is preferably set to an interval longer than the lubricant supply time interval at the stage where the determination is performed ( In the case of a short time interval, the same determination is made unless lubrication oil is supplied.)

  In the second embodiment, the method (b) shown in the flowchart of FIG. 7 is adopted, and as shown in FIG. 2, the average rotational speed of the rotating shaft in a predetermined unit time is changed from the lowest rotational speed to the highest rotational speed. In the range up to, a plurality of average speed areas are set, and the speed coefficient corresponding to each average speed area is set so that the absolute value sequentially increases from the low-speed average speed area to the high-speed average speed area. When the rotation axis is stationary for a unit time, the speed coefficient is set to 0, and the speed coefficient corresponding to the average rotation speed per unit time is sequentially integrated as the rotation time of the rotation axis elapses. In addition, the lubricating oil is supplied when the integrated value is equal to or greater than a preset limit number (L).

  That is, in the case of the embodiment of FIG. 2, after setting an appropriate amount of lubricating oil discharge by integrating the speed change up to the time of the rotation operation, it is further based on the abnormality diagnosis of the rotary bearing (1). Therefore, an appropriate lubricating oil can be supplied.

  As shown in FIG. 2, also in the second embodiment, the flowchart of FIG. 7 is adopted as a part of the process, and as shown in FIG. 7, it corresponds to a section where a safe state of the rotary bearing is possible. Whether or not is determined is sequentially performed after a predetermined time interval, and the time interval is preferably set to an interval longer than the lubricant supply time interval at the stage where the determination is performed ( In the case of a short time interval, the same determination is made unless lubrication oil is supplied.)

  The present invention realizes not only rotating bearings in the field of machine tools but also rotating bearings in other rotating devices as a whole, and it is possible to set appropriate lubricating oil based on the diagnosis. It can be applied to all fields in the industry that employ rotating bearings.

It is a flowchart which sets and adjusts the time interval which supplies the lubricating oil in Example 1. FIG. It is a flowchart which sets and adjusts the time interval which supplies the lubricating oil in Example 2. FIG. It is a graph which shows each relationship between lubricating oil, AE signal output, and power consumption, Comprising: (a) has shown the relationship between lubricating oil supply amount and AE signal output, (b) is lubricating oil supply amount and consumption. The relationship with electric power is shown, (c) has shown the relationship between power consumption and AE signal output. It is a graph which shows each division by which the numerical value showing each rank is displayed based on the absolute value of AE signal output difference and the absolute value of power consumption difference. It is a flowchart which shows the process of the method of said (1). It is a flowchart which shows the process which employ | adopted the method of said (a) among the methods of said (2). It is a flowchart which shows the process which employ | adopted the method of said (B) among the methods of said (2).

Claims (10)

In an abnormality diagnosis method for a rotary bearing, an AE signal output (Acoustic Emission signal output) detected from the rotary bearing and power consumption required for the rotation of the rotary bearing are selected as diagnostic indicators, and an AE that can realize safe driving. Based on the signal output (hereinafter abbreviated as “safety reference signal output”) and power consumption that can realize safe driving (hereinafter abbreviated as “safety reference power consumption”), the motor rotates at a predetermined rotational speed. The absolute value (| AW-AWE ₀ ) of the difference (AE−AE ₀ : hereinafter referred to as “AE signal output difference”) between the AE signal output and the specific safety reference signal output (AE ₀ ) at the stage of operation. |), And the absolute value (| W−W ₀ |) of the difference (W−W ₀ : hereinafter referred to as “power consumption difference”) between the power consumption (W) and the specific safety standard power consumption (W ₀ ). ), Each division by each numerical range, For each section, a numerical value representing a rank in which each numerical value range sequentially increases from the smaller side is set (however, the numerical value representing the smallest rank is set to the same numerical value for both AE signal output and power consumption). ), The numerical value representing the rank corresponding to the absolute value of the AE signal output difference, and the numerical value representing the rank corresponding to the absolute value of the power consumption difference, the smaller one being the overall rank in the rotation state. Then, according to the numerical value representing the overall rank, the rotation bearing based on generating a signal corresponding to the stage based on the numerical value representing the plurality of overall ranks divided from the safe state to the dangerous state. Abnormal diagnosis method. Each block based on the upper limit (m) of the numerical value representing the rank corresponding to each block by the absolute value of the AE signal output difference (| AE−AE ₀ |) and the absolute value (| W−W ₀ |) of the power consumption difference The abnormality diagnosis method for a rotary bearing according to claim 1, wherein an upper limit value (n) of a numerical value representing a rank corresponding to is equal (m = n). Each block based on the upper limit (m) of the numerical value representing the rank corresponding to each block by the absolute value of the AE signal output difference (| AE−AE ₀ |) and the absolute value (| W−W ₀ |) of the power consumption difference 2. The rotary bearing according to claim 1, wherein the upper limit value of the former is larger than the upper limit value of the latter (m> n) between the upper limit value (n) of the numerical values corresponding to the ranks. Abnormal diagnosis method. Scratches or indentations occur in the rotary bearing in each of the sections based on the absolute value of the AE signal output difference corresponding to the upper limit value of the numerical value representing the rank and each section based on the absolute value of the power consumption difference (| W−W ₀ |). 2. The method for diagnosing abnormality of a rotary bearing according to claim 1, wherein the abnormality diagnosis method corresponds to a stage in which the rotating bearing is in operation. After adopting the abnormality diagnosis method for a rotary bearing according to claim 1, the power consumption difference (W−W ₀ ) is positive, and as a result of diagnosis by the abnormality diagnosis method, safe operation of the rotary bearing becomes possible. When it does not correspond to such a section, the absolute value of the AE signal output difference (| AE−AE ₀ |) and the absolute value of the power consumption difference (| W−W ₀ |) can each be safely operated. Until the state corresponding to such a section is reached, the lubricating oil supply time interval is expanded, the power consumption difference (W−W ₀ ) is negative, and the rotating bearing is installed as a diagnosis result by the abnormality diagnosis method. When it does not correspond to a section where safe driving is possible, the absolute value of the AE signal output difference and the absolute value of the power consumption difference are in a state corresponding to a section where safe driving is possible. To reduce the lubricant supply time interval Supply control method of the lubricating oil based on and.   6. The lubricating oil supply control method according to claim 5, wherein a specific time interval is set when the lubricating oil supply time is expanded and when the lubricating oil supply time is reduced.   When expanding the supply time of the lubricating oil, the coefficient (c) larger than 1 is set, and then the supply time is adjusted by multiplying the time interval for supplying the lubricating oil in the rotational operation stage, and lubrication is performed. When reducing the oil supply time, the coefficient (c) smaller than 1 is selected, and the supply time is adjusted by multiplying the supply time of the lubricating oil during the rotation operation. The lubricating oil supply control method according to claim 5.   8. The lubricating oil supply control method according to claim 7, wherein a coefficient (c) to be multiplied is different for each stage according to the overall rank of the rotation state.   The rotation speed of the rotary bearing is divided into predetermined ranges according to the size, and the supply time interval of the lubricating oil is set corresponding to each division. The lubricating oil supply control method according to claim 5, wherein the lubricating oil is supplied so as to be set short. For the average rotation speed of the rotating shaft in a predetermined unit time, set a plurality of average speed areas in the range from the minimum rotation speed to the maximum rotation speed, and set the speed coefficient corresponding to each average speed area to a low speed. When the speed coefficient whose absolute value increases sequentially from the average speed area to the high-speed average speed area is set and the rotating shaft is stationary in unit time, the speed coefficient is set to 0, and the rotation time of the rotating shaft As the time elapses, the speed coefficients corresponding to the average rotational speed per unit time are sequentially integrated, and the lubricating oil is supplied when the integrated value is equal to or greater than the preset limit value (L). The lubricating oil supply control method according to claim 5, 6, or 7.

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