KR20190100379A - Status analysis device, display method, and program - Google Patents

Abstract

The state analysis device 10 has a current acquiring unit 11 for acquiring a current signal flowing through the target device 30, and at the timing associated with a certain period, based on the current signal, according to the state of the target device. A parameter calculation unit 12 that calculates values of a plurality of parameters that vary and correlate with each other, and a predetermined threshold value as a criterion for determining the state of the target device in a coordinate space around each of the plurality of parameters. Generating display information on which a dividing line indicating a, a first figure indicating a value of the plurality of parameters associated with one timing, and a second figure indicating a change amount of values of the plurality of parameters calculated at different timings are generated; And a display information generating unit 17.

Description

Status analysis device, display method, and program

The present invention relates to a state analysis device, a display method, and a program.

This application claims priority about Japanese Patent Application No. 2017-019899 for which it applied to Japan on February 06, 2017, and uses the content here.

In facilities, such as a power plant, in order to monitor the state of the operation | movement of an apparatus, it inserts a current clamp in predetermined location of an apparatus, and measures a current signal. In this case, the monitoring device generates a frequency domain graph of the current by fast Fourier transforming the measured current signal and displays it on the screen (see Patent Document 1, for example). The inspector then observes the displayed frequency domain graph and performs abnormality detection and identification of the device. Specifically, the inspector specifies a parameter indicating a predetermined operation of the device from the observation result of the frequency domain graph, and specifies the state of the operation related to the parameter.

Prior Art Literature

[Patent Documents]

[Patent Document 1] Japanese Patent No. 5828948

However, reading of the frequency domain graph requires skill, and it is difficult for an inexperienced person to identify the state of the device from the frequency domain graph. The frequency domain graph represents the instantaneous state of the device but does not appear in the frequency domain graph how it is changing from the past state. Therefore, it is difficult to predict the state change of the apparatus only by observing the frequency domain graph. Furthermore, according to the parameter specified from the frequency domain graph, it is possible to specify the state of the operation related to the parameter, but it is difficult to specify the state not related to the individual parameter.

An object of the present invention is to provide a state analysis device, a display method, and a program that can easily identify a state and a change of state of a target device.

According to the first aspect of the present invention, a state analysis device includes a current acquisition unit for acquiring a current signal flowing through a target device, and the state of the target device based on the current signal at a timing associated with a predetermined period. A parameter calculator that calculates values of a plurality of parameters that vary and correlate with each other, and a dividing line indicating a predetermined threshold that is a criterion for determining the state of the target device in a coordinate space around each of the plurality of parameters; And display information for generating display information in which a first figure indicating a value of the plurality of parameters related to one timing and a second figure indicating a change amount of the value of the plurality of parameters calculated at different timings are arranged. It has a generation unit.

According to the second aspect of the present invention, in the state analysis device according to the first aspect, the display information generation unit is a predetermined method when at least one of the plurality of parameters related to different timings exceeds the threshold. The display information containing the message may be generated.

According to the third aspect of the present invention, in the state analysis device according to the first aspect, the display information generating unit includes a case in which at least one of the plurality of parameters related to different timings exceeds the threshold and the threshold value; In the case of not exceeding, the display form of the first figure may be different.

According to the fourth aspect of the present invention, in the state analysis device according to any one of the first to third aspects, the state of the target device includes a normal state in which the target device is normal, an abnormal state in which the target device is abnormal, And a caution state in which the state of the target device is capable of transitioning to an abnormal state, wherein the display information generation unit comprises: a first division line which distinguishes the normal state from the caution state as the division line; The display information including the second dividing line for dividing the abnormal state may be generated.

According to the fifth aspect of the present invention, in the state analysis device according to any one of the first to fourth aspects, the target device includes a motor that rotates around the rotor, and an auxiliary device that rotates with the rotor. And a plurality of parameters are parameters representing an overall state of the target device, a parameter representing a state of the rotor, a parameter representing a state of misalignment of the rotor and the auxiliary device, and an effective value of current flowing through the motor. It may be a some parameter selected from the group which consists of a parameter which shows, the parameter which shows the quality of the power supply related to the said electric current, and the parameter which shows the state of the said auxiliary apparatus.

According to the sixth aspect of the present invention, the display method varies in accordance with the state of the target device based on the current signal at a timing associated with acquiring a current signal flowing through the target device and correlates with each other. Calculating a value of a plurality of parameters having a relationship, calculating an amount of change of the values of the plurality of parameters calculated at different timings, and in a coordinate space around each of the plurality of parameters, And displaying display information in which a dividing line indicating a threshold used as a criterion for the state, a first figure indicating values of the plurality of parameters related to one timing, and a second figure indicating the change amount are arranged.

According to the seventh aspect of the present invention, the program varies with the computer depending on the state of the target device based on the current signal at the timing associated with acquiring a current signal flowing through the target device, and at a timing associated with a constant period. Calculating the values of a plurality of parameters having correlation with each other, calculating an amount of change of the values of the plurality of parameters calculated at different timings, and in a coordinate space with each of the plurality of parameters as an axis. Generating display information on which a dividing line indicating a threshold value, which is a criterion for determining the state of the apparatus, a first figure indicating a value of the plurality of parameters related to one timing, and a second figure indicating the change amount are arranged; Let's do it.

According to at least 1 aspect of the said aspect, a state analysis apparatus calculates a parameter from a current signal and produces | generates display information which displays this parameter with the division line which shows a threshold value. Thereby, based on the displayed information, the state of the target apparatus can be specified without requiring skill. In addition, the state analysis device generates display information for displaying a figure indicating the amount of change in the parameter. This makes it possible to recognize the transition of the state of the target device based on the displayed information. Moreover, the state analysis apparatus arrange | positions the figure which shows a parameter in the coordinate space which made the axis | shaft of each of the some parameter which has a mutual correlation. This makes it possible to identify a state not associated with an individual parameter by visually recognizing the deflection of the parameter or the amount of change in the parameter.

1 is a schematic diagram illustrating a configuration of a state analysis system according to the first embodiment.
2 is a schematic block diagram showing a configuration of a state analysis device according to the first embodiment.
3 is a diagram illustrating an example of information stored in a parameter storage unit according to the first embodiment.
4 is a diagram illustrating an example of information stored in a threshold storage unit according to the first embodiment.
FIG. 5 is a flowchart showing a current parameter calculation process by the state analysis device according to the first embodiment. FIG.
FIG. 6 is a flowchart showing current parameter display processing by the state analysis device according to the first embodiment. FIG.
7 is a diagram illustrating an example of a graph illustrating a relationship between a KI parameter and an Lpole parameter.
8 is a diagram illustrating an example of a graph illustrating a relationship between an IHD parameter and a THD parameter.
9 is a diagram illustrating an example of a graph illustrating a relationship between an Lpole parameter and an Lshaft parameter.
10 is a schematic block diagram showing a configuration of a computer according to at least one embodiment.

EMBODIMENT OF THE INVENTION Hereinafter, 1st Embodiment is described in detail, referring drawings.

1 is a schematic diagram illustrating a configuration of a state analysis system according to the first embodiment.

The state analysis system 1 which concerns on 1st Embodiment is the state analysis apparatus 10, the display apparatus 20, the target apparatus 30, the three-phase AC power supply 40, the power line 50, and the clamp ammeter 60 ).

The state analysis device 10 according to the first embodiment causes the display device 20 to display information indicating the state of the target device 30 to be inspected. The target device 30 according to the first embodiment is a rotary mechanical system including auxiliary motors such as a motor driven by a three-phase alternating current power source and a rotor provided with the motor, such as a pump or a fan that rotates. The target device 30 is connected to the three-phase AC power supply 40 via the power line 50. The power line 50 is fitted to the clamp ammeter 60. The state analysis system 1 is provided with three clamp ammeters 60, and each clamp ammeter 60 fits into a different power line, respectively. On the other hand, in another embodiment, the state analysis system 1 may be equipped with one or two clamp ammeters 60, and may not measure a part of electric current among three power lines 50. As shown in FIG. The clamp ammeter 60 measures the magnitude of the current flowing through the power line 50 and outputs it to the state analyzer 10 as a digital signal (current signal). The state analysis device 10 causes the display device 20 to display information indicating the state of the target device 30 based on the current signal received from the clamp ammeter 60.

2 is a schematic block diagram showing a configuration of a state analysis device according to the first embodiment.

The state analysis device 10 includes a current acquisition unit 11, a parameter calculation unit 12, a parameter storage unit 13, a threshold storage unit 14, a graph generator 15, a transition detection unit 16, and a display. The control unit 17 is provided.

The current acquisition unit 11 acquires a current signal flowing from the clamp ammeter 60 through the power line 50 to the target device 30.

The parameter calculating part 12 calculates the value of the some parameter which changes according to the state of the target apparatus 30 based on the current signal which the current acquisition part 11 acquired in the timing which concerns on a fixed period. Hereinafter, the parameter calculated by the parameter calculation part 12 is called a current parameter. Examples of specific current parameters will be described later. At least two of the plurality of current parameters calculated by the parameter calculator 12 are parameters having a correlation with each other.

The parameter storage unit 13 stores the value of the current parameter calculated by the parameter calculation unit 12 in association with the calculation time.

The threshold storage unit 14 stores, for each current parameter, a threshold that serves as a criterion for determining the state of the target device 30. The classification of the state of the target apparatus 30 which concerns on 1st Embodiment is made into the normal state in which the target apparatus 30 is normal, the abnormal state in which the target apparatus 30 is abnormal, and the state of the target apparatus 30 in an abnormal state. A state of caution that can transition. In other words, the threshold storage unit 14 stores, for each current parameter, a first threshold value that distinguishes the steady state from the attention state, and a second threshold value that distinguishes the attention state from the abnormal state.

The graph generating unit 15 generates a graph image indicating the amount of change from the value of the current parameter calculated by the parameter calculating unit 12 and the value of the previous current parameter to the value of the current current parameter. The graph image is a graph in which two current parameters correlated with each other are taken as the vertical axis and the horizontal axis. In the graph image, a dividing line indicating a threshold value associated with each current parameter, a plot (first figure) indicating a value of two current parameters and an arrow (second figure) indicating a change amount are arranged.

The transition detection unit 16 detects that the value of each current parameter has changed beyond the threshold stored by the threshold storage unit 14.

The display control unit 17 generates display information output to the display device 20 based on the graph screen generated by the graph generating unit and the detection result by the transition detecting unit 16. The display control unit 17 is an example of the display information generation unit.

Here, the current parameter calculated by the parameter calculating unit 12 according to the first embodiment will be described.

The parameter calculator 12 according to the first embodiment calculates a KI parameter, an Lpole parameter, an Lshaft parameter, an Irms parameter, a THD parameter, an IHD parameter, an Lx parameter, and an Iub parameter.

The KI parameter is a parameter representing the overall state of the target device 30. The KI parameter is the amount of Culbleible information on the reference amplitude probability density variable fr (x) of the reference sinusoidal signal waveform representing the rated amplitude probability density function ft (x) and the rated current of the motor obtained from the current signal. Specifically, the KI parameter is obtained by the following equation (1).

The Lpole parameter is a parameter representing the state of the rotor of the target device 30. The Lpole parameter is the magnitude of the peak of the sideband of the current spectrum at a frequency position separated by a predetermined frequency from the current spectrum peak in the frequency spectrum obtained by converting the current signal into the frequency domain. The sideband associated with the Lpole parameter is a sideband that varies due to the pole pass frequency of the motor.

The Lshaft parameter is a parameter indicating a state of misalignment between the rotor of the target device 30 and the auxiliary device. Lshaft parameter is calculated | required by the magnitude | size of the peak of the side band of the current spectrum in the frequency position obtained by converting a current signal into a frequency domain by the predetermined frequency centered on a current spectrum peak. The sidebands related to the Lshaft parameter are sidebands that vary due to the actual rotation frequency of the motor.

The Irms parameter is a parameter for monitoring the rotational mechanical load and state variation of the target device 30. The Irms parameter is a current effective value obtained by dividing the sum of squares of the current values at each sampling timing by the sampling timing number and finding the square root.

The IHD parameter is the ratio of the maximum harmonic component and the power supply frequency component of the current signal. The IHD parameter can be obtained by extracting harmonic components from the current signal and dividing the maximum value within a predetermined order of the harmonic components by the power source frequency effective value.

The THD parameter is the ratio of all harmonic components and power supply frequency components of the current signal. The THD parameter can be obtained by extracting harmonic components from the current signal and dividing the square root of the sum of squares of each harmonic component in a predetermined order by the power source frequency effective value of the current signal. Both the IHD parameter and the THD parameter are parameters representing the quality of the three-phase AC power supply 40.

The Lx parameter is a parameter representing the state of the auxiliary device of the target device 30. Lx parameter is the magnitude | size of the peak of the side band of the current spectrum in the frequency position separated by predetermined frequency centering on the current spectrum peak among the frequency spectrum obtained by converting a current signal into a frequency domain. The sidebands related to the Lx parameter are the sidebands fluctuating due to the blade passing frequency of the pump or blower, the sidebands fluctuating due to the fitting frequency of the gear arrangement, and the sidebands fluctuating due to the rotational frequency of the pulley belt. , Or is a side wave that fluctuates because of a side wave that fluctuates due to the sliding frequency of the rotor bar.

The Lx parameter indicated by the magnitude of the peak of the sideband wave fluctuating due to the blade pass frequency of the pump or blower is called an Lbp parameter. The Lx parameter indicated by the magnitude of the peak of the sideband wave fluctuating due to the engagement frequency of the gear device is referred to as an Lgz parameter. The Lx parameter indicated by the magnitude of the peak of the sideband wave fluctuating due to the rotational frequency of the pulley belt is called an Lbr parameter. In addition, the Lx parameter represented by the magnitude | size of the peak of the sideband which fluctuates attributable to any one of the sidebands which fluctuates because of the sliding frequency of a rotor bar is called Lrs parameter. A pump, a blower, a gear, a pulley belt, and a rotor bar are examples of auxiliary equipment of the target device 30.

The Iub parameter is a parameter indicating the power quality or the deterioration status of the stator of the motor and the inverter. The Iub parameter can be obtained by dividing the difference between the maximum value and the minimum value among the current effective values of the three-phase current signal by the sum of the maximum value and the minimum value. In other words, the Iub parameter is a parameter representing the three-phase current balance of the current signal.

The KI parameter increases when the rotor deteriorates, and the Lpole parameter decreases when the rotor deteriorates. That is, the KI parameter and the Lpole parameter have a correlation with the state of the rotor of the target device 30.

The KI parameter increases when the unbalanced state of the motor shaft system deteriorates, and the Lshaft parameter and various Lx parameters decrease when the unbalanced state of the motor shaft system deteriorates. That is, the KI parameter, the Lshaft parameter, and the various Lx parameters have a correlation with the unbalanced state of the shaft system of the motor of the target device 30. Moreover, KI parameter increases when the misalignment state of the motor shaft system deteriorates, and Lshaft parameter decreases when the state of misalignment of the motor shaft system deteriorates. That is, the KI parameter and the Lshaft parameter have a correlation with the misalignment state of the shaft system of the motor of the target device 30.

Both the KI parameter and the Irms parameter increase when the load fluctuation condition worsens. In other words, the KI parameter and the Irms parameter have a correlation with respect to the load fluctuation state of the target device 30.

The KI parameters, the THD parameters, the IHD parameters, and the Iub parameters all increase when the stator of the motor or power quality deteriorates. That is, the KI parameter, the THD parameter, the IHD parameter, and the Iub parameter have a correlation with the state or power quality of the stator of the target device 30.

The Lpole and Lshaft parameters both decrease when the motor deteriorates. That is, the Lpole parameter and the Lshaft parameter have a correlation with the state of the rotor of the target device 30.

3 is a diagram illustrating an example of information stored in the parameter storage unit according to the first embodiment. As shown in Fig. 3, the parameter storage unit 13 includes the measurement time, the KI parameter, the Lpole parameter, the Lshaft parameter, for each measurement time that is a timing associated with a fixed period (for example, half a day or every day). The Irms parameter, the THD parameter, the IHD parameter, the Lx parameter, and the Iub parameter are stored in association with each other.

4 is a diagram illustrating an example of information stored in the threshold storage unit according to the first embodiment.

As shown in FIG. 4, the threshold storage unit 14 is configured to determine the values of the steady state values for each of the KI parameter, Lpole parameter, Lshaft parameter, Irms parameter, THD parameter, IHD parameter, Lx parameter, and Iub parameter. The range, the range of values for the attention state, and the range of values for the abnormal state are stored. Here, the threshold which distinguishes the range of the value which becomes a steady state and the range of the value which becomes a attention state is a 1st threshold value, and the threshold which distinguishes the range of the value which becomes a attention state and the range of the value which becomes an abnormal state is a 1st threshold value. 2 threshold. That is, storing the range of values to be in the steady state, the range of values to be in the attention state, and the range of values to be in the abnormal state are equivalent to storing the first threshold and the second threshold.

In 1st Embodiment, the range of the value which becomes a steady state, the range of the value which becomes a attention state, and the range of the value which becomes an abnormal state with respect to each current parameter are as follows. In addition, the range shown below is an example to the last, and is not limited to this about other embodiment.

The range of the value of the KI parameter to be in a steady state is less than 1.0. The range of values of the KI parameter to be in the attention state is 1.0 or more and less than 1.5. The range of the value of the KI parameter in an abnormal state is 1.5 or more. That is, the first threshold associated with the KI parameter is 1.0 and the second threshold associated with the KI parameter is 1.5.

The range of the value of the Lpole parameter to be in a steady state is more than 50 dB. The range of values of the Lpole parameter to be in the attention state is more than 40 dB and 50 dB or less. The range of the value of the Lpole parameter in an abnormal state is 40 dB or less. That is, the first threshold associated with the Lpole parameter is 50 dB and the second threshold associated with the Lpole parameter is 40 dB.

The range of the Lshaft parameter value to be in a steady state is more than 50 dB. The range of the Lshaft parameter value to be in the attention state is more than 40 dB and less than 50 dB. The range of the Lshaft parameter value in an abnormal state is 40 dB or less. That is, the first threshold associated with the Lshaft parameter is 50 dB and the second threshold associated with the Lshaft parameter is 40 dB.

The range of the value of the Irms parameter to be in a steady state is less than ± 10% of variation. The range of the value of the Irms parameter to be in the attention state is not less than ± 10% of variation at the same time. The range of the value of the Irms parameter in an abnormal state is more than ± 20% of variation. That is, the first threshold associated with the Irms parameter is ± 10% of variation, and the second threshold associated with the Irms parameter is ± 20% of variation.

The range of the value of the THD parameter to be in a steady state is less than 5%. The range of values of the THD parameter to be in the attention state is 5% or more and less than 10% at the same time. The range of the value of the THD parameter in an abnormal state is 10% or more. That is, the first threshold associated with the THD parameter is 5% and the second threshold associated with the THD parameter is 10%.

The range of the value of the IHD parameter to be in a steady state is less than 3%. The range of the value of the IHD parameter to the attention state is 3% or more and less than 5% at the same time. The range of the value of the IHD parameter in an abnormal state is 5% or more. That is, the first threshold associated with the IHD parameter is 3% and the second threshold associated with the IHD parameter is 5%.

The range of the value of the Lx parameter to be in a steady state is more than 50 dB. The range of the value of the Lx parameter to be in the attention state is more than 40 dB and 50 dB or less. The range of the value of the Lx parameter in an abnormal state is 40 dB or less. That is, the first threshold associated with the Lx parameter is 50 dB and the second threshold associated with the Lx parameter is 40 dB.

The range of the value of the Iub parameter to be in a steady state is less than 3%. The range of values of the Iub parameter to be in the attention state is 3% or more and less than 5% at the same time. The range of the value of the Iub parameter which turns into an abnormal state is 5% or more. That is, the first threshold associated with the Iub parameter is 3% and the second threshold associated with the Iub parameter is 5%.

Here, the operation of the state analysis device 10 according to the first embodiment will be described.

5 is a flowchart showing a current parameter calculation process by the state analysis device according to the first embodiment.

The state analysis apparatus 10 performs a current parameter calculation process for every timing which concerns on a fixed period. The current acquisition unit 11 of the state analyzer 10 acquires a current signal from the clamp ammeter 60 (step S1). In addition, since the current acquisition unit 11 acquires a current signal for each sampling timing, the current signal acquired by the current acquisition unit 11 represents a change in the magnitude of the current in a predetermined period. Next, the parameter calculator 12 converts the current signal into the frequency domain and generates a frequency domain waveform (step S2). An FFT is mentioned as a method of frequency domain conversion.

The parameter calculator 12 calculates a current parameter based on the current signal acquired in step S1 and the frequency domain waveform generated in step S2 (step S3). The parameter calculating unit 12 records the calculated current parameter in the parameter storage unit 13 in association with the current time (step S4).

The state analysis device 10 executes the above-described current parameter calculation process for each timing associated with a constant cycle, and thus can record the time series of the current parameters in the parameter storage unit 13.

FIG. 6 is a flowchart showing current parameter display processing by the state analysis device according to the first embodiment. FIG.

The state analysis device 10 receives an input of a set of current parameters to be displayed when a display instruction of a current parameter is made by a user's operation (step S11). The input of the set of current parameters may be a parameter pair (e.g., a pair of Lshaft parameters and an Lpole parameter, a pair of THD parameters and an IHD parameter, a KI parameter and an Lx parameter) having a correlation with each other set in advance in the state analyzer 10. And a selection by the user from a list of pairs). In another embodiment, input of a set of current parameters may be made by input of arbitrary two parameters by a user.

Next, the graph generating unit 15 of the state analysis device 10 draws a coordinate space in which each current parameter associated with the selected pair is the axis G1 (step S12). In other words, the graph generating unit 15 draws orthogonal axes G1 representing paired current parameters. In this embodiment, "drawing" means arrange | positioning a figure in a virtual space (virtual plane). Next, the graph generating unit 15 reads out the first threshold value and the second threshold value associated with each current parameter associated with the pair selected from the threshold storage unit 14, and divides the line G2 (first) indicating the first threshold value. The division line G2 (2nd division line) which shows a division line) and a 2nd threshold value is drawn (step S13). The dividing line G2 indicating the threshold value associated with one current parameter is a line parallel to the axis G1 indicating the one current parameter. Next, the graph generating unit 15 draws a plot G3 on the coordinate space indicating the last recorded value (the value after the change) as the value of each current parameter associated with the pair selected from the parameter storage unit 13. (Step S14).

Next, the graph generating unit 15 changes the value after the change from the coordinates indicating the second value (the value before the change) that is recorded from the last to the value of each current parameter associated with the pair selected from the parameter storage unit 13. An arrow G4 extending to the coordinates indicating is drawn on the coordinate space (step S15). At this time, the difference between the measurement time associated with the value before the change and the measurement time associated with the value after the change is equal to the time associated with the constant period. In addition, arrow G4 becomes long, so that the difference of the value before a change and the value after a change is large. In other words, the arrow G4 is as long as the amount of change in the current parameter is large.

Next, the transition detection unit 16 determines that at least one of the current parameters associated with the selected pair is the first threshold or the second based on the first threshold value and the second threshold value stored in the threshold storage unit 14. It is determined whether or not it has changed beyond the threshold (step S16). When the value of the current parameter changes beyond the first threshold value or the second threshold value (step S16: YES), the graph generating unit 15 displays a predetermined message (for example, "The state of the target device 30 is attentive." And the like ”(step S17). In addition, the message continues to be displayed until a predetermined time elapses from the timing when the value of the current parameter exceeds the threshold. On the other hand, in another embodiment, a predetermined message may be drawn only when the value of the current parameter changes in a direction deteriorating beyond the first threshold value or the second threshold value. In another embodiment, the display form of the plot G3 may be changed in place of the writing of a predetermined message. As an example of the display form of the plot G3, the color of the plot G3, the magnitude | size of the plot G3, the presence or absence of flickering of the plot G3, etc. are mentioned.

On the other hand, when the value of the current parameter does not exceed the first threshold value and the second threshold value (step S16: NO), the graph generator 15 does not draw a predetermined message.

And the display control part 17 produces | generates display information based on the figure drawn by the graph generation part 15, and outputs this display information to the display apparatus 20 (step S18). As a result, the display device 20 includes a dividing line G2 indicating the threshold of the current parameter, a plot G3 indicating the value of the pair of current parameters, and an arrow G4 indicating the amount of change of the value of the current parameter calculated at different timings. Display the graph on which is placed.

7 is a diagram illustrating an example of a graph illustrating a relationship between a KI parameter and an Lpole parameter.

When the user selects a pair of the KI parameter and the Lpole parameter in step S11, the graph as shown in FIG. 7 is displayed on the display device 20. According to the graph shown in FIG. 7, the state of the target device 30 can be determined based on the KI parameter and the Lpole parameter. The KI parameter and the Lpole parameter are correlated with the rotor state of the target device 30. Therefore, the user can easily confirm the state of the rotor of the target apparatus 30 by the graph shown in FIG. Specifically, the KI parameter increases when the rotor deteriorates, and the Lpole parameter decreases when the rotor deteriorates. That is, when the state of the rotor deteriorates, the position of the plot G3 usually moves in the lower right direction. On the other hand, when the moving direction of the plot G3 is not the lower right direction, it can be judged that an event different from the normal rotor deterioration has occurred. When the user selects a pair of KI parameter and Lshaft parameter, even when the user selects a pair of KI parameter and Lx parameter, a graph similar to FIG. 7 is displayed on the display device 20.

8 is a diagram illustrating an example of a graph illustrating a relationship between an IHD parameter and a THD parameter.

When the user selects a pair of the IHD parameter and the THD parameter in step S11, the graph as shown in FIG. 8 is displayed on the display device 20. According to the graph shown in FIG. 8, the state of the target device 30 can be determined based on the IHD parameter and the THD parameter. The IHD parameter and the THD parameter correlate to the state or power quality of the stator of the motor of the target device 30. Therefore, the user can easily confirm the state or power supply quality of the stator of the motor of the target device 30 by the graph shown in FIG. Specifically, the IHD parameter and the THD parameter increase when the state of the stator of the motor or the power supply quality deteriorate. In other words, when the state of the stator of the motor or the power supply quality deteriorate, the position of the plot G3 usually moves in the upper right direction. On the other hand, when the moving direction of the plot G3 is not the upper right direction, it can be judged that an event different from the state of the stator of the normal motor or the deterioration of the power supply quality occurs.

9 is a diagram illustrating an example of a graph illustrating a relationship between an Lpole parameter and an Lshaft parameter.

When the user selects the pair of the Lpole parameter and the Lshaft parameter in step S11, the display device 20 displays a graph as shown in FIG. According to the graph shown in FIG. 9, the state of the target device 30 can be determined based on the Lpole parameter and the Lshaft. The Lpole parameter and the Lshaft parameter are correlated with the state of the rotor of the target device 30. Therefore, the user can easily confirm the state of the rotor of the target apparatus 30 by the graph shown in FIG. Specifically, the Lpole parameter and the Lshaft parameter decrease when the motor state deteriorates. Here, the Lpole parameter and the Lshaft parameter are parameters in which the motor changes in response to deterioration of different parts. Therefore, the user can guess the location where the abnormality has occurred in the motor by observing the inclination of the movement direction of the plot G3.

On the other hand, when the user wants to confirm the state of the target device 30 indicated by each current parameter, the user can select a graph related to the pair of KI parameters and Lpole parameters, a graph related to the pair of KI parameters and Lshaft parameters, and a KI parameter. It is sufficient to check the graph associated with the pair of Lx parameters and the graph associated with the pair of IHD parameters and THD parameters. Alternatively, the user may check a graph relating to the pair of Lpole parameters and Lshaft parameters, a graph related to the pair of KI parameters and Lx parameters, and a graph related to the pair of IHD parameters and THD parameters.

Thus, according to 1st Embodiment, the state analyzer 10 shows the division line G2 which shows a threshold value, and the value of a current parameter in the coordinate space which made the axis | shaft of each of the some current parameter correlated with each other. Plot G3 and the display information which arrange | positioned the arrow G4 which show the amount of change of the value of a current parameter are produced | generated. Thereby, the user can recognize how the state of the target device 30 is changing even if he is not experienced in reading the frequency domain graph. In addition, as described above, according to the first embodiment, the user can also recognize a state other than the state associated with the individual current parameter. In addition, as another embodiment, the value of a current parameter may be shown by figures other than plot G3. For example, although arrow G4 of 1st Embodiment is a figure which shows the amount of change of a current parameter, since the arrowhead shows the value of the current parameter which concerns on one timing, the arrow G4 also shows the value of a current parameter. It can be referred to as a figure representing. In addition, as another embodiment, the amount of change in the current parameter may be represented by a figure other than arrow G4. For example, the magnitude of the change amount of the current parameter may be displayed in a chart or may be indicated by the color of the plot G3.

Moreover, according to 1st Embodiment, the state analysis apparatus 10 produces | generates the display information containing a predetermined message, when the value of at least 1 of the some parameter related to another timing exceeds a threshold. As a result, the user can quickly recognize that the state of the target device 30 has changed. On the other hand, in another embodiment, the state analysis device 10 may change the display form of the plot G3 even when at least one of a plurality of parameters related to different timings exceeds the threshold and does not exceed the threshold. good. By this, similarly to the first embodiment, the user can quickly recognize that the state of the target device 30 has changed.

As mentioned above, although one Embodiment was described in detail with reference to drawings, a specific structure is not limited to the above-mentioned thing, Various design changes, etc. are possible.

For example, although the state analysis apparatus 10 which concerns on embodiment mentioned above displays the graph which concerns on a pair of current parameter on the display apparatus 20, it is not limited to this. For example, the state analysis device 10 according to another embodiment may cause the display device 20 to display a high-dimensional graph relating to a set of three or more current parameters.

Moreover, the state analysis apparatus 10 which concerns on the above-mentioned embodiment is the plot which shows the division line G2 which shows a threshold value, and the value of a current parameter in the coordinate space which made the axis | shaft of each of the some current parameter which has a mutual correlation as an axis. Although the display information which arrange | positioned G3 is produced | generated, it is not limited to this. For example, the state analysis device 10 according to another embodiment may generate a value of one current parameter related to one time and display information indicating the amount of change. Even in such an embodiment, the user can recognize how the state of the target device 30 is changing.

In addition, although the state analysis apparatus 10 which concerns on embodiment mentioned above performs display control by outputting display information to the display apparatus 20 directly connected to it, it is not limited to this. For example, the state analysis device 10 according to another embodiment may record display information in a storage medium or transmit display information to another display device 20 connected via a network without performing display control. good.

Moreover, although the target apparatus 30 which concerns on embodiment mentioned above is a rotating mechanical system in which a motor and an auxiliary device rotate about the same axis, it is not limited to this. For example, the target device 30 according to another embodiment may be connected to a motor and an auxiliary device via a mechanical system such as a gear device.

Moreover, although the state analysis apparatus 10 which concerns on embodiment mentioned above classifies the state of the target apparatus 30 into three divisions, a normal state, an abnormal state, and a attention state, it is not limited to this. For example, the state analysis device 10 according to another embodiment may be classified into two divisions of a steady state and an abnormal state, or may be classified into four or more divisions.

10 is a schematic block diagram showing a configuration of a computer according to at least one embodiment.

The computer 90 includes a CPU 91, a main memory device 92, an auxiliary memory device 93, and an interface 94.

The state analysis apparatus 10 mentioned above is mounted in the computer 90. The operation of each processing unit described above is stored in the auxiliary storage device 93 in the form of a program. The CPU 91 reads out the program from the auxiliary storage device 93 and expands it to the main memory device 92, and executes the above process according to the program. In addition, the CPU 91 secures the main storage device 92 to a storage area corresponding to each of the storage units described above in accordance with the program.

Examples of the auxiliary storage device 93 include a hard disk drive (HDD), a solid state drive (SSD), a magnetic disk, a magneto-optical disk, a compact disc read only memory (CD-ROM), and a digital versatile disc read only (DVD-ROM). Memory), semiconductor memory, and the like. The auxiliary storage device 93 may be internal media directly connected to the bus of the computer 90, or may be external MIDI connected to the computer 90 via the interface 94 or a communication line. In addition, when this program is delivered to the computer 90 by a communication line, the computer 90 that has received the delivery may deploy the program to the main storage device 92 to execute the above process. In at least one embodiment, the auxiliary storage device 93 is a non-transitory tangible storage medium.

The program may be for realizing some of the functions described above. The program may be implemented by combining the above-described function with another program already stored in the auxiliary storage device 93, or a so-called difference file (differential program).

(Industrial availability)

According to the state analysis device, the display method, and the program which concern on this application, the state of a target apparatus and a change of state can be identified easily.

1: condition analysis system
10: health analysis device
11: current acquisition unit
12: parameter calculation unit
13: Parameter memory
14: threshold memory
15: graph generator
16: Transition Detector
17: display control unit
20: display device
30: Target device
40: three phase AC power
50: power line
60: clamp ammeter
G1: shaft
G2: Divider
G3: Plot
G4: arrow

Claims (7)

A current acquisition unit for acquiring a current signal flowing through the target device;
A parameter calculator that calculates values of a plurality of parameters that vary according to the state of the target device and correlate with each other, based on the current signal, at a timing associated with a predetermined period;
A division line indicating a predetermined threshold value, which is a criterion for determining the state of the target device, in a coordinate space around each of the plurality of parameters, a first figure indicating values of the plurality of parameters related to one timing; And a display information generation unit for generating display information in which a second figure indicating an amount of change in the value of the plurality of parameters calculated at different timings is arranged.
Condition analysis device provided with.
The method of claim 1,
And the display information generating unit generates the display information including a predetermined message when at least one of the plurality of parameters related to another timing exceeds the threshold.
The method according to claim 1 or 2,
And the display information generation unit changes the display form of the first figure when the value of at least one of the plurality of parameters related to different timings exceeds the threshold and does not exceed the threshold.
The method according to any one of claims 1 to 3,
The state of the target device includes a normal state in which the target device is normal, an abnormal state in which the target device is abnormal, and a caution state in which the state of the target device can transition to an abnormal state,
The display information generation unit may generate the display information including the first division line for dividing the normal state and the attention state and the second division line for dividing the attention state and the abnormal state as the dividing line.
Health analysis device.
The method according to any one of claims 1 to 4,
The target device is a device having a motor that rotates around the rotor, and an auxiliary device that rotates with the rotor,
The plurality of parameters may include a parameter representing an overall state of the target device, a parameter representing a state of the rotor, a parameter representing a state of misalignment of the rotor and the auxiliary device, a parameter representing an effective value of current flowing through the motor, And a plurality of parameters selected from the group consisting of a parameter representing a quality of a power source related to the current, and a parameter representing a state of the auxiliary device.
Health analysis device.
Acquiring a current signal flowing through the target device;
Calculating a value of a plurality of parameters that vary according to the state of the target device and correlate with each other, based on the current signal, at a timing associated with a constant period;
Calculating a change amount of the values of the plurality of parameters calculated at different timings,
A division line indicating a threshold value as a criterion for determining the state of the target device in a coordinate space around each of the plurality of parameters, a first figure indicating values of the plurality of parameters related to one timing, and the Displaying display information in which a second figure representing a change amount is arranged
Display method comprising a.
To the computer,
Acquiring a current signal flowing through the target device;
Calculating a value of a plurality of parameters that vary according to the state of the target device and correlate with each other, based on the current signal, at a timing associated with a constant period;
Calculating a change amount of the values of the plurality of parameters calculated at different timings,
A division line indicating a threshold value as a criterion for determining the state of the target device in a coordinate space around each of the plurality of parameters, a first figure indicating values of the plurality of parameters related to one timing, and the Generating display information in which a second figure representing a change amount is arranged
Program to run.

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