Method for detecting reasonable health index of device

Abstract

The present invention relates to a method for detecting a reasonable health index of a device, the method comprising: classifying a device into an intermittent driving type and a continuous driving type according to a pattern of operation of the device; differently setting, according to the type of the device for which health is to be detected, a weight of a constant current item or a load time item for device health detection; and then applying the weight set for each of the items according to the type of the device, to health values of the intermittent driving type and the continuous driving type, which are detected based on the real-time current waveform of the device, to compensate for the types of the device according to various operation patterns, thereby detecting a very reasonable health index of the device.

Description

Method for detecting a reasonable health index of a device

[0001] The present invention relates to a method for detecting a reasonable health index of a device, and more particularly, to a method for detecting a reasonable health index of a device, which classifies devices into intermittent operation types and continuous operation types according to the operation pattern of the device, sets different weights for constant current items or load time items for detecting the health of the device according to the type of the device whose health is to be detected, and then applies the weights set for each item according to the type of the device to the health values ​​of the constant current and load time items detected based on the current waveform of the device in real time, thereby compensating for the type of the device according to various operation patterns, thereby detecting a very reasonable health index of the device.

[0002] In general, stable operation is very important for various devices used for automation processes of facilities.

[0003] For example, in the facilities of a large-scale production plant, tens or hundreds of devices are installed and operate in conjunction with each other to continuously produce products. If a single device among the many devices breaks down, a catastrophic situation can occur where the entire facility's operation comes to a halt.

[0004] At this time, downtime due to equipment failure inevitably leads to enormous losses not only in equipment repair costs but also in operating costs and business effects wasted while the equipment is down.

[0005] To avoid such unexpected downtime costs, the present applicant has developed and proposed a method for detecting the health index of a device that can provide information on the real-time status of the device to the manager, thereby enabling efficient management of the device by performing inspection and repair before the device malfunctions.

[0006] However, the health index detection methods of the device developed and proposed by the present applicant detected the health of the device by applying the current value consumed by the device to a specific detection method, and since such detection method is uniformly applied to all devices used in various operation patterns, there was a problem in that the reliability of the detected health of the device was somewhat low.

[0007] The present invention has been proposed to solve the above-mentioned problems, and its purpose is to provide a reasonable health index detection method of a device, which can detect a very reasonable health index of a device by classifying the device into an intermittent operation type and a continuous operation type according to the operation pattern of the device, and setting different weights of constant current items or load time items for detecting the health of the device according to the type of the device whose health is to be detected, and then applying the weights set for each item according to the type of the device to the health values ​​of the constant current and load time items detected based on the current waveform of the device in real time, thereby compensating for the type of the device according to various operation patterns.

[0008] In addition, in order to detect the health of the device, various detection items such as constant current items, load time items, starting current items, ground fault current items, and current unbalance rate items are presented, and the health of the device in real time is detected based on the weights assigned to each of the presented items according to the type of device, thereby providing a method for detecting a reasonable health index of the device that can secure excellent reliability for the reasonable health index of the device being detected.

[0009] In order to achieve the above object, the present invention provides a reasonable health index detection method of a device, comprising: a detection item classification step (S10) in which information on changes in the size of current consumed over time in a device driven to perform an operation is collected to construct a current waveform, and a constant current item for detecting the health of the device based on a current state in a constant speed section in which the current size is continuously maintained in a certain range; and a load time item for detecting the health of the device based on a time in which a current waveform measured and collected from the device within a set detection time exceeds a set reference value; a device type classification step (S20) in which the device is classified into an intermittent operation type and a continuous operation type based on the operation pattern of the device; a weight setting step (S30) in which the type of the device for which health is to be detected is selected from intermittent and continuous operation types, and weights for the constant current item and the load time item are set based on the selected type; and a constant speed section of a real-time current waveform measured and collected from a device performing a real-time operation is applied to the constant current item to detect the health of the device, and the real-time current waveform is applied to the load time item. It is characterized by including a detection step (S40) for detecting a reasonable health index of a real-time device by applying a weight set to each item after detecting the health of the device.

[0010] In addition, the constant current item sets a constant speed reference value in consideration of the rated current of the device, and if the current value of the constant speed section in the current waveform of the device is less than the constant speed reference value, the device is detected as being in a stable state, and if the current value of the constant speed section exceeds the constant speed reference value, the device is detected as being in an unstable state, and the load time item sets a starting reference value of a peak section in which the current size is formed to a maximum in the current waveform of the device in consideration of the rated current of the device, and if the sum of the time during which the current value of the peak section in the current waveform of the device exceeds the starting reference value and the time during which the current value of the constant speed section exceeds the constant speed reference value within the set detection time is less than the load reference time, the device is detected as being in a stable state, and if the load reference time is exceeded, the device is detected as being in an unstable state.

[0011] In addition, in the device type classification step (S20), a device of a type having a pattern with a short operating time and a large number of operating times is classified as an intermittent operation type, and a device of a type having a pattern with a long operating time and a small number of operating times is classified as a continuous operation type. In the weight setting step (S30), if the device corresponds to the intermittent operation type, the weight of the load time item is set to be the same as or higher than the weight of the constant current item, and if the device corresponds to the continuous operation type, the weight of the constant current item is set to be the same as or higher than the weight of the load time item.

[0012] In addition, the constant current item sets a constant speed reference value that is smaller than the rated current of the device, and if the current value of the constant speed section in the current waveform of the device is less than the constant speed reference value, it is detected as a stable state, and if the current value of the constant speed section exceeds the constant speed reference value, it is detected as an unstable state to determine the health of the device, and if the device is in a stable state, a health value of 1 is assigned, and if the device is in an unstable state, a health value of less than 1 is assigned, and the load time item sets a start reference value that is larger than the rated current of the device, and if the sum of the time during which the current value of the peak section in the current waveform of the device exceeds the start reference value and the time during which the current value of the constant speed section exceeds the constant speed reference value within the set detection time is less than the load reference time, the device is detected as a stable state, and if the load reference time is exceeded, the device is detected as an unstable state, and if the device is in a stable state, a health value of 1 is assigned, and if the device is in an unstable state, a health value of less than 1 is assigned, and the weight setting step (S30) determines, for a total of 100% of the weights, the above according to the type of device for which health is to be detected. A weight % is set for each of the constant current item and the load time item, and the detection step (S40) detects a health index of the constant current item by multiplying the health value detected by applying the current state of the constant section of the real-time current waveform measured from the real-time device to the constant current item and the weight % set for the constant current item, and detects a health index of the constant current item by multiplying the health value detected by applying the current waveform measured and collected from the device within the set detection time to the load time item and the weight % set for the load time item, and then detects a reasonable health index by adding the health index of the constant current item and the health index of the load time item.

[0013] In addition, the detection item classification step (S10) further includes a starting current item that detects the health of the device based on the current state of the peak section in the current waveform measured and collected from the device, a ground fault current item that detects the difference value between the amount of power supplied to the device performing the operation and the amount of power consumed by the device and detects the health of the device based on the detected difference value, and a current unbalance rate item that detects the unbalance rate of the current value supplied to the three phases (R phase, S phase, T phase) of the device and detects the health of the device based on the unbalance rate of the three phases, and the weight setting step (S30) further selects one or more of the starting current item, the ground fault current item, and the current unbalance rate item, and sets weights for the selected item and the constant current item and the load time item, respectively, and the detection step (S40) further includes a constant current item and a load time item based on real-time current waveform information measured and collected from the device performing the real-time operation, and for the items selected in the weight setting step (S30), respectively. After detecting the health, it is characterized by applying a weight set for each item to detect a reasonable health index of the real-time device.

[0014] In addition, the device type classification step (S20) is characterized by further including an irregular operation type that distinguishes a device having an irregular pattern in operation time or number of operations.

[0015] As described above, according to the method for detecting a reasonable health index of a device according to the present invention, the device is divided into an intermittent operation type and a continuous operation type according to the operation pattern of the device, and the weights of the constant current item or the load time item for detecting the health of the device are set differently according to the type of the device whose health is to be detected, and then the health values ​​of the constant current and load time items detected based on the current waveform of the device in real time are applied with the weights set for each item according to the type of the device, thereby compensating for the type of the device according to various operation patterns, thereby having the effect of detecting a very reasonable health index of the device.

[0016] In addition, in order to detect the health of the device, various detection items such as constant current items, load time items, starting current items, ground fault current items, and current unbalance rate items are presented, and the health of the device in real time is detected based on the weights assigned to each of the presented items according to the type of device, thereby securing excellent reliability for the reasonable health index of the detected device.

[0017] FIG. 1 is a block diagram of a method for detecting a reasonable health index of a device according to an embodiment of the present invention.

[0018] Figures 2 to 8 are drawings for explaining a reasonable health index detection method of the device shown in Figure 1.

[0019] A method for detecting a reasonable health index of a device according to a preferred embodiment of the present invention is described in detail with reference to the attached drawings. Detailed descriptions of known functions and configurations that may unnecessarily obscure the gist of the present invention are omitted.

[0020] FIGS. 1 to 8 illustrate a method for detecting a reasonable health index of a device according to an embodiment of the present invention. FIG. 1 is a block diagram of a method for detecting a reasonable health index of a device according to an embodiment of the present invention, and FIGS. 2 to 8 are drawings for explaining a method for detecting a reasonable health index of the device illustrated in FIG. 1.

[0021] As illustrated in FIG. 1, a method (100) for detecting a reasonable health index of a device according to an embodiment of the present invention includes a detection item classification step (S10), a device type classification step (S20), a weight setting step (S30), and a detection step (S40).

[0022] The above detection item classification step (S10) is a step of dividing the detection item into a constant current item that detects the health of the device based on the current state of the constant speed section in which the current size is continuously maintained within a certain range in the current waveform constructed by collecting information on changes in the current size consumed over time in the device driven to perform an operation, and a load time item that detects the health of the device based on the time during which the current waveform measured and collected from the device exceeds a set reference value within a set detection time.

[0023] Typically, a device that operates based on power, for example, a device that operates based on an electric motor, when the device is driven to perform an operation, as shown in Fig. 2, a high current is required at the time of starting the operation, so that the current size is formed to be large. After that, when the device is normally operated and stabilized, the current size is maintained within a certain range.

[0024] That is, in the detection item classification step (S10), information on the change in the current size consumed over time in the device being driven to perform an operation is collected to construct a current waveform, and in the constructed current waveform, a section in which the current size is formed high at the time when the driving starts is set as a peak section, and a section in which the driving is stabilized and the current size is maintained in a constant range is set as a constant speed section, and the constant speed current item detects the health of the device through the current state of the constant speed section, and a constant speed reference value is set in consideration of the rated current of the device, and if the current value of the constant speed section in the current waveform of the device is less than the constant speed reference value, the device is detected as a stable state, and if the current value of the constant speed section exceeds the constant speed reference value, the device is detected as an unstable state, and the load time item sets the start reference value of the peak section in which the current size is formed at the maximum in the current waveform of the device, considering the rated current of the device, and if the sum of the time during which the current value of the peak section in the current waveform of the device exceeds the constant speed reference value within the set detection time is less than the load reference time, the device is detected as a stable state, and the load If the standard time is exceeded, the device is detected as unstable.

[0025] In detail, the constant current item sets a constant speed reference value that is smaller than the rated current of the device, and if the current value of the constant speed section in the current waveform of the device is less than the constant speed reference value, it is detected as a stable state, and if the current value of the peak section exceeds the startup reference value, it is detected as an unstable state to determine the health of the device, and if the device is in a stable state, a health value of 1 is assigned, and if the device is in an unstable state, a health value of less than 1 is assigned, and the load time item sets a startup reference value that is larger than the rated current of the device, and if the sum of the time during which the current value of the peak section in the current waveform of the device exceeds the startup reference value and the time during which the current value of the constant speed section exceeds the constant speed reference value within the set detection time is less than the load reference time, the device is detected as a stable state, and if the load reference time is exceeded, the device is detected as an unstable state, and if the device is in a stable state, a health value of 1 is assigned, and if the device is in an unstable state, a health value of less than 1 is assigned, which will be described below.

[0026] The above device type classification step (S20) is a step for classifying the device into a single-drive type and a continuous-drive type based on the device's operating pattern.

[0027] Here, the above-mentioned single-drive type refers to a device having a pattern with a short operating time and a large number of operating times, and the above-mentioned continuous-drive type refers to a device having a pattern with a long operating time and a small number of operating times.

[0028] For example, the above-mentioned single-speed drive type device may be a device that constitutes equipment that assembles products while performing repetitive operations, and the above-mentioned continuous-drive type device may be a device such as a conveyor or pump that operates for a long time.

[0029] The above weight setting step (S30) is a step of selecting the type of device for which soundness is to be detected from among the intermittent and continuous operation types, and setting weights for the constant current item and the load time item based on the selected type.

[0030] In detail, in the weight setting step (S30), if the device corresponds to the intermittent driving type, the weight of the load time item is set to be equal to or higher than the weight of the constant current item, and if the device corresponds to the continuous driving type, the weight of the constant current item is set to be equal to or higher than the weight of the load time item.

[0031] Here, the reason why the weights of the items are set differently according to the intermittent and continuous operation types as described above is that, as shown in FIG. 3, the intermittent operation type device has the characteristic of repeatedly performing operations in a short period of time, and therefore, the current waveform having peak and constant speed sections is repeatedly collected, and therefore, the weight of the load time item that can detect the peak and constant speed sections of the current waveform as a whole is set high, and as shown in FIG. 4, the continuous operation type device has the characteristic of continuously performing operations for a long time once it is operated, and therefore, the constant speed section of the current waveform is formed longer than the peak section, and therefore, the weight of the constant speed current item that can intensively monitor the current status of the constant speed section is set high.

[0032] For example, the above weight setting step (S30) can appropriately set a weight % numerically for each of the constant current item and the load time item according to the type of device for which soundness is to be detected, with respect to the total weight of 100%.

[0033] Of course, the weight of the load time item set high in the above-mentioned intermittent drive type or the weight of the constant current item set high in the above-mentioned continuous drive type can be set to various values ​​in consideration of the environment and conditions in which the device is actually used.

[0034] The above detection step (S40) is a step of detecting the health of the device by applying the constant speed section of the real-time current waveform measured and collected from the device performing real-time operation to the constant speed current item, detecting the health of the device by applying the real-time current waveform to the load time item, and then detecting a reasonable health index of the real-time device by applying a weight set to each item.

[0035] That is, the detection step (S40) detects a health index of the constant current item by applying the current state of the constant section of the real-time current waveform measured from the real-time device to the constant current item and multiplying the detected health value by a weight % set for the constant current item, and detects a health index of the constant current item by applying the current waveform measured and collected from the device within the set detection time to the load time item and multiplying the detected health value by a weight % set for the load time item, and then adding the health index of the constant current item and the health index of the load time item to detect a reasonable health index.

[0036] Through a method (100) for detecting a reasonable health index of a device according to an embodiment of the present invention consisting of the steps described above, a reasonable health index of a device (pump) that is installed in a water purification plant and operates for a long time once it is operated, and has a rated current of 17 A, is detected as follows.

[0037] First, based on the operating pattern of the device whose health is to be detected, it is classified as a single-drive type or a continuous-drive type. Since the device has a pattern with a long operating time and a small number of operations, it is classified as a continuous-drive type.

[0038] Then, considering the environment and conditions in which the device is used and the device information corresponding to the continuous operation type, weights are set for the detection items that can detect the health of the device. Based on the information collected as above, it is assumed that a weight of 70% is set for the constant current item and a weight of 30% is set for the load time item out of the total 100% of the weights.

[0039] Then, as shown in Fig. 5, the health value of the device is continuously detected through the constant speed reference value set by applying the current value of the constant speed section from the real-time current waveform measured and collected from the device that operates repeatedly in real time to the constant speed current item.

[0040] Here, the constant speed reference value is set to a current value corresponding to 60% of the rated current, and if the current value of the constant speed section is less than the constant speed reference value, the health value is detected as 1, and if the current value of the constant speed section is greater than the constant speed reference value, the health value is formed to be less than 1, and the health value gradually decreases in proportion to the size of the current value of the constant speed section exceeding the constant speed reference value. For example, if the current value of the constant speed section corresponds to 60 to 70% of the rated current, the health value is set to 0.9, if the current value of the constant speed section corresponds to 70 to 80% of the rated current, the health value is set to 0.8, if the current value of the constant speed section corresponds to 80 to 100% of the rated current, the health value is set to 0.7, and if the current value of the constant speed section exceeds 100% of the rated current, the health value is set to 0.5.

[0041] At the same time, the current waveform measured and collected from the device within the set detection time is applied to the load time item, and the health value of the device is detected through the time exceeding the set starting and constant speed reference values.

[0042] Here, the start-up reference value is set to 300% of the rated current, the constant-speed reference value is set to a current value corresponding to 60% of the rated current, the detection time is set to 24 hours, and the load reference time is set to 10% (2.4 hours) of the set detection time. If the sum of the time during which the current value of the peak section of the real-time current waveform of the device exceeds the start-up reference value and the time during which the current value of the constant-speed section exceeds the constant-speed reference value within the set detection time of 24 hours is less than 10% of the set 24 hours, the health value is detected as 1, and if it corresponds to 10 to 20%, the health value is detected as 0.9, if it corresponds to 20 to 30%, the health value is detected as 0.8, and if it exceeds 30%, the health value is detected as 0.6.

[0043] Of course, the settings of the constant speed and starting reference values ​​and the load reference time for detecting the health value in the above constant speed current and load time items can be set in various ways by taking into consideration the rated current of the device, usage environment, conditions, etc.

[0044] Then, as shown in FIG. 6, the health value of the constant current item detected based on the real-time current waveform measured from the real-time device is multiplied by a 70% weight set for the constant current item to detect the health index of the real-time device for the constant current item, and at the same time, the health value of the load time item detected based on the current waveform of the real-time device is multiplied by a 30% weight set for the load time item to detect the health index of the real-time device for the load time item, and then the health indices are added up to detect and provide a reasonable health index of the real-time device.

[0045] Here, the above embodiment has set a high weight to the constant current item that detects the health of the constant speed section due to the characteristic of detecting a reasonable health index of a device corresponding to a continuous operation type, but in the case of detecting the health of a device corresponding to an intermittent operation type with a pattern of short operation time and many operation times, it is of course possible to detect a reasonable health index of the device by setting a high weight to the load time item that can detect the health of the device by monitoring the peak section together.

[0046] Meanwhile, the detection item classification step (S10) further includes a starting current item that detects the health of the device based on the current state of the peak section in the current waveform measured and collected from the device, a ground fault current item that detects the difference value between the amount of power supplied to the device performing the operation and the amount of power consumed by the device, and detects the health of the device based on the detected difference value, and a current unbalance rate item that detects the unbalance rate of the current value supplied to the three phases (R phase, S phase, T phase) of the device, and detects the health of the device based on the unbalance rate of the three phases.

[0047] The above weight setting step (S30) further selects one or more of the above starting current items, ground fault current items, and current unbalance rate items, and sets weights for the selected items and the constant current items and load time items, respectively, and the above detection step (S40) detects the health of the device for each of the items selected in the above weight setting step (S30) together with the constant current items and load time items based on real-time current waveform information measured and collected from a device performing real-time operation, and then applies the weights set for each item to detect a reasonable health index of the device in real time.

[0048] For example, in order to detect a reasonable health index of a device, in the weight setting step (S30), the constant current item and the load time item, as well as the starting current item, the ground fault current item, and the current unbalance rate item are further selected to detect the health of the device from a total of five items. However, considering the type of the device, the rated current, the usage environment and conditions, etc., it is assumed that the weight of the constant current item is set to 25%, the weight of the load time item is set to 20%, the weight of the starting current item is set to 20%, the weight of the ground fault current item is set to 20%, and the weight of the current unbalance rate item is set to 15%, thereby detecting a reasonable health index of the device in real time.

[0049] Here, the constant current item and the load time item were set to the constant speed and start reference values ​​and the load reference time as described above to detect the health dimension, and the start current item was set so that if the current value of the peak section in the current waveform of the real-time device is less than 300% of the rated current (17A) of the device, the health value is detected as 1, and if it corresponds to 300 to 400% of the rated current, the health value is 0.9, if it corresponds to 400 to 500% of the rated current, the health value is 0.8, and if it exceeds 500% of the rated current, the health value is detected as 0.7, and the ground fault current item was set so that if the difference (ground fault current) value between the amount of power supplied to the real-time device and the amount of power consumed by the device based on the rated current of 17A of the device is less than 0.1A, the health value is detected as 1, and if it corresponds to 0.1 to 0.29A, the health value is detected as 1. The current unbalance rate item is set to detect the health value as 0.7 when the value is 0.9, 0.3 to 0.49A, and 0.5A when the value exceeds 0.5A, and the health value is set to detect the health value as 0.5. The current unbalance rate item is set to detect the health value as 1 when the unbalance rate for the three-phase current value supplied to the real-time device is less than 5%, and the health value is set to detect the health value as 0.9 when the value is 5 to 10%, 0.7 when the value is 10 to 20%, and 0.5 when the value exceeds 20%.

[0050] Of course, the various values ​​set to detect the health value in the above constant current items, load time items, starting current items, ground fault current items, and current unbalance rate items can be set to various sizes in consideration of the rated current of the device, usage environment, conditions, etc.

[0051] Then, as shown in Fig. 7, the real-time current waveform measured and collected from the real-time operating device is applied to the constant current item, load time item, starting current item, ground fault current item, and current unbalance rate item to detect the health value for each item.

[0052] As described above, based on the current waveform measured and collected from the real-time device, the constant current item, the load time item, the starting current item, the ground fault current item, and the current unbalance rate item are applied to the detected health value and multiplied by each set weighting % to detect the health index of each item. As summarized in Fig. 8, the constant current item detects the health index by multiplying the detected health value by the set weighting of 25%, the load time item detects the health index by multiplying the detected health value by the set weighting of 20%, the starting current item detects the health index by multiplying the detected health value by the set weighting of 20%, the ground fault current item detects the health index by multiplying the detected health value by the set weighting of 20%, and the current unbalance rate item detects the health index by multiplying the detected health value by the set weighting of 15%, and then adding up the health indices of each item. Detects a reasonable health index of real-time devices.

[0053] Here, it goes without saying that the weights set for the constant current item, load time item, starting current item, ground fault current item, and current unbalance rate item can be freely set for each item by considering the type of device, the environment in which the device is used, conditions, etc.

[0054] Meanwhile, the device type classification step (S20) may further include an irregular operation type that distinguishes devices having an irregular pattern of operation time or number of operations.

[0055] If the type of device for which soundness is to be detected corresponds to the irregular operation type, the weights for the constant current and load time items are appropriately (freely) set by collecting and considering information such as the pattern, time, environment, and conditions under which the device actually operates in the field, so that the soundness index for devices that operate somewhat irregularly can also be reasonably detected.

[0056] Here, the irregularly driven device may be a device such as an elevator.

[0057] The method (100) for detecting a reasonable health index of a device of the present invention, which is composed of the steps described above, divides the device into an intermittent operation type and a continuous operation type according to the operation pattern of the device, and sets different weights for constant current items or load time items for detecting the health of the device according to the type of the device whose health is to be detected, and then applies the weights set for each item according to the type of the device to the health values ​​of the constant current and load time items detected based on the current waveform of the device in real time, thereby compensating for the type of the device according to various operation patterns, thereby having the effect of detecting a very reasonable health index of the device.

[0058] In addition, in order to detect the health of the device, various detection items such as constant current items, load time items, starting current items, ground fault current items, and current unbalance rate items are presented, and the health of the device in real time is detected based on the weights assigned to each of the presented items according to the type of device, thereby securing excellent reliability for the reasonable health index of the detected device.

[0059] While the present invention has been described with reference to the embodiments illustrated in the accompanying drawings, these are merely illustrative and are not limited to the above-described embodiments. Those skilled in the art will readily appreciate that various modifications and equivalent embodiments are possible. Furthermore, it should be understood that modifications are possible by those skilled in the art without departing from the spirit and scope of the present invention. Therefore, the scope of the claims in the present invention is not limited to the detailed description, but rather by the claims set forth below and their technical spirit.

[0060] The present invention can be used in the device health industry.

Claims

1. A detection item classification step in which a constant current item detects the health of a device based on the current status of a constant speed section in which the current size is continuously maintained within a certain range in a current waveform constructed by collecting information on changes in the size of current consumed over time in a device driven to perform an operation, and a load time item detects the health of a device based on the time during which the current waveform measured and collected from the device exceeds a set reference value within a set detection time; A device type classification step that classifies the device into a single-action type and a continuous-action type based on the device's operating pattern; A weight setting step in which the type of the device to be detected for soundness is selected from among the single-speed and continuous-drive types, and weights for the constant-speed current item and the load time item are set based on the selected type; and A method for detecting a reasonable health index of a device, characterized by including a detection step of detecting a reasonable health index of the device in real time by applying a constant speed section of a real-time current waveform measured and collected from a device performing real-time operation to the constant speed current item to detect the health of the device, and applying the real-time current waveform to the load time item to detect the health of the device, and then applying a set weight to each item.

2. In paragraph 1, The above constant current items are: Considering the rated current of the device, a constant speed reference value is set, and if the current value of the constant speed section in the current waveform of the device is less than the constant speed reference value, the device is detected as a stable state, and if the current value of the constant speed section exceeds the constant speed reference value, the device is detected as an unstable state. The above load time items are: A method for detecting a reasonable health index of a device, characterized in that the device is detected as being in a stable state if the sum of the time during which the current value of the peak section of the device's current waveform exceeds the startup reference value and the time during which the current value of the constant speed section exceeds the constant speed reference value is less than the load reference time, and the device is detected as being in an unstable state if the load reference time is exceeded, after setting the startup reference value of the peak section in the device's current waveform in consideration of the rated current of the device.

3. In paragraph 1 or 2, In the above device type classification step, a device type with a pattern of short operation time and many operation counts is classified as a single-action type, and a device type with a pattern of long operation time and few operation counts is classified as a continuous-action type. A method for detecting a reasonable health index of a device, characterized in that in the weight setting step, if the device corresponds to the intermittent driving type, the weight of the load time item is set to be the same as or higher than the weight of the constant current item, and if the device corresponds to the continuous driving type, the weight of the constant current item is set to be the same as or higher than the weight of the load time item.

4. In paragraph 3, The above constant current item sets a constant speed reference value that is smaller than the rated current of the device, and if the current value of the constant speed section in the current waveform of the device is less than the constant speed reference value, it is detected as a stable state, and if the current value of the constant speed section exceeds the constant speed reference value, it is detected as an unstable state to determine the health of the device. If the device is in a stable state, it is given a health value of 1, and if the device is in an unstable state, it is given a health value of less than 1. The above load time item sets a starting reference value that is higher than the rated current of the device, and if the sum of the time during which the current value of the peak section of the device's current waveform exceeds the starting reference value and the time during which the current value of the constant speed section exceeds the constant speed reference value within the set detection time is less than the load reference time, the device is detected as being in a stable state, and if the load reference time is exceeded, the device is detected as being in an unstable state. If the device is in a stable state, a health value of 1 is given, and if the device is in an unstable state, a health value of less than 1 is given. The above weight setting step is for 100% of the total weight. Depending on the type of device for which soundness is to be detected, a weighting percentage is set for each of the above constant current items and the above load time items. The above detection step detects the health index of the constant current item by applying the current status of the constant current section of the real-time current waveform measured from the real-time device to the constant current item and multiplying the detected health value by the weight % set for the constant current item. The health index of the load time item is detected by applying the current waveform measured and collected from the device within the set detection time to the load time item and multiplying the detected health value by the weight % set for the load time item. A method for detecting a reasonable health index of a device, characterized in that a reasonable health index is detected by adding the health index of the constant current item and the health index of the load time item.

5. In paragraph 2, The above detection item classification step further includes a starting current item that detects the health of the device based on the current status of the peak section in the current waveform measured and collected from the device, a ground fault current item that detects the difference value between the amount of power supplied to the device performing the operation and the amount of power consumed by the device, and detects the health of the device based on the detected difference value, and a current unbalance rate item that detects the unbalance rate of the current value supplied to the three phases (R phase, S phase, T phase) of the device, and detects the health of the device based on the unbalance rate of the three phases. The above weight setting step further selects one or more of the above starting current items, ground fault current items, and current unbalance rate items, and sets weights for the selected items and the above constant current items and load time items, respectively. The above detection step detects the health of the device for each item selected in the weight setting step together with the constant current item and the load time item based on real-time current waveform information measured and collected from a device performing real-time operation, and then applies the set weight to each item to detect a reasonable health index of the device in real time. A method for detecting a reasonable health index of a device.

6. In paragraph 3, A method for detecting a reasonable health index of a device, characterized in that the above device type classification step further includes an irregular operation type for distinguishing devices having an irregular pattern of operation time or number of operations.

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