Condition monitoring device and condition monitoring method

Abstract

To enable accurate detection of abnormalities in railway equipment that is driven by motors and operates intermittently. [Solution] The condition monitoring device 1 acquires the current value of the motor 141 (motor current value) during one operating period of the movable platform gate 10, divides the operating period into a predetermined number of judgment periods, calculates an integrated current value by accumulating the motor current values ​​during each judgment period, evaluates the difference between the integrated current value and a given reference integrated current value for each judgment period, and determines an abnormality of the movable platform gate 10 based on whether the evaluation result for each judgment period satisfies predetermined approximation conditions.

Description

Technical Field

[0001] The present invention relates to a condition monitoring device and the like.

Background Art

[0002] In a movable home fence, a method is known for detecting an abnormality or its sign of the movable home fence from a motor current by utilizing the fact that the current of a motor driving a door portion varies according to the load applied to the motor, that is, the load accompanying the movement of the door portion (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the method of Patent Document 1 detects an abnormality by comparing motor current waveform signals related to each of a plurality of door portions, and it is not possible to detect an abnormality only from a motor current waveform signal related to one door portion.

[0005] In addition, lubricants such as grease applied between the door portion and the guide rail and to the motor to move the door portion smoothly have temperature characteristics. When the effect of the lubricant is reduced due to the temperature characteristics and the sliding resistance increases, the sliding resistance can become a dominant factor in the movement resistance of the door portion. Even if there is no abnormality in the mechanical parts such as the door portion including the motor, when the sliding resistance increases due to a change in the environmental temperature, the load applied to the motor increases. Therefore, when simply monitoring the abnormality of a movable home fence installed in an environment where the environmental temperature changes based only on the motor current, it becomes difficult to distinguish whether the increase in the motor current is due to an abnormality in the mechanical parts or an increase in the sliding resistance caused by the temperature characteristics of the lubricant, and the accuracy of abnormality detection may decrease.

[0006] The above problems could similarly occur in other railway equipment besides movable platform screen doors, such as points and barriers, which are operated intermittently by motors.

[0007] The problem that this invention aims to solve is to enable accurate detection of abnormalities in railway equipment that is driven by a motor and operates intermittently. [Means for solving the problem]

[0008] The first invention for solving the above problem is: An acquisition means (for example, the acquisition unit 202 in Figure 7) for acquiring the drive electrical characteristic value of a motor during one operating period of railway equipment (for example, the movable platform screen door 10 in Figure 1) that is driven by a motor and operates intermittently, The operating period is divided into a predetermined number of determination periods, and for each determination period, a calculation means (for example, the calculation unit 204 in Figure 7) performs a predetermined statistical calculation on the drive electrical characteristic value during that determination period to calculate an electrical characteristic statistical value, For each of the aforementioned determination periods, a difference evaluation means (for example, the difference evaluation unit 206 in Figure 7) evaluates the difference between the electrical characteristic statistical value and a given reference characteristic value for that determination period, A determination means (for example, the determination unit 208 in Figure 7) determines whether the evaluation results for each determination period by the difference evaluation means satisfy predetermined approximation conditions, and determines whether the railway equipment is abnormal. This is a condition monitoring device equipped with [a specific feature / feature].

[0009] As another invention, A condition monitoring method for monitoring the status of railway equipment that is driven by a motor and operates intermittently, Obtain the driving electrical characteristic values ​​of the motor during one operating period of the railway equipment (for example, step S1 in Figure 8), The operation period is divided into a predetermined number of determination periods, and for each determination period, a predetermined statistical calculation is performed on the drive electrical characteristic value during that determination period to calculate the electrical characteristic statistical value (for example, step S5 in Figure 8), For each of the aforementioned judgment periods, the difference between the electrical characteristic statistical value and a given reference characteristic value for that judgment period is evaluated (for example, step S7 in Figure 8), Based on whether the results of the evaluation for each of the aforementioned judgment periods satisfy predetermined approximate conditions, an abnormality in the railway equipment is determined (for example, step S9 in Figure 8), A status monitoring method including this may be configured.

[0010] According to the first invention, it becomes possible to accurately detect abnormalities in railway equipment that is driven by a motor and operates intermittently. In particular, it becomes possible to accurately detect abnormalities in railway equipment installed in environments where the ambient temperature changes.

[0011] In other words, even if there is no abnormality in the mechanism related to the motor drive, if the sliding resistance in the mechanism increases due to changes in ambient temperature, the load on the motor may increase. However, the change in motor current due to this increase will be a change that occurs throughout the entire operating period. Therefore, if we evaluate the difference between the electrical characteristic statistics based on the motor's driving electrical characteristics and the reference characteristic values ​​when the railway equipment is functioning normally, for each judgment period which is defined as a single operating period, the differences for each judgment period will be similar. From this, it becomes possible to distinguish whether the change in motor current is due to an abnormality in the mechanism or due to sliding resistance, and thus enable accurate detection of abnormalities in railway equipment.

[0012] Furthermore, even if the railway equipment is functioning correctly, the drive electrical characteristic values ​​may not perfectly match and may differ from one operating period to the next. Therefore, by performing statistical calculations on the drive electrical characteristic values ​​to obtain electrical characteristic statistics, it becomes possible to efficiently evaluate the differences from the reference characteristic values ​​for each judgment period.

[0013] The second invention is, in the above invention, An abnormal part estimation means (for example, the abnormal part estimation unit 210 in Figure 7) estimates the abnormal part of the mechanism driven by the motor based on the determination period among the plurality of determination periods that does not satisfy the approximation condition. It is a condition monitoring device further equipped with the following features.

[0014] When there is an abnormality in a specific part of the mechanism related to the drive by the motor, the load applied to the motor, that is, the motor current, temporarily increases at the timing related to that specific part during one operation period. Therefore, as in the second invention, by basing on the determination period in which the difference between the electrical characteristic statistical value and the reference characteristic value does not satisfy the approximation condition among the plurality of determination periods obtained by dividing the operation period, it becomes possible to estimate the abnormal part of the mechanism section.

[0015] The third invention is the above-described invention, a reference characteristic value setting means (for example, the reference characteristic value setting unit 212 in FIG. 7) for setting the reference characteristic value based on the drive electrical characteristic values for each of the determination periods in the past operation periods, is a state monitoring device further comprising.

[0016] The drive electrical characteristic values in one operation period can be different for each railway facility. Therefore, as in the third invention, by setting the reference characteristic value based on the drive electrical characteristic values for each of the determination periods in the past operation periods, it becomes possible to improve the accuracy of abnormality determination of railway facilities.

[0017] The fourth invention is the above-described invention, <OO00082>the calculation means calculates the integrated value obtained by integrating the drive electrical characteristic values during the determination period as the electrical characteristic statistical value, is a state monitoring device.

[0018] According to the fourth invention, it becomes possible to calculate the electrical characteristic statistical value by a simple method such as calculating the integrated value of the drive electrical characteristic values during the determination period.

[0019] The fifth invention is the above-described invention, a determination period setting means (for example, the determination period setting unit 214 in FIG. 7) for setting the plurality of determination periods by dividing the operation period according to the speed range of the motor, is a state monitoring device further comprising.

[0020] During one operation period, the motor performs operations such as starting from a stopped state, accelerating after starting to rotate, and then decelerating and stopping. Therefore, as in the fifth invention, by dividing the operation period according to the speed range of the motor and setting the determination period, it becomes possible to appropriately divide each operation period that is intermittently performed and set the determination period.

[0021] The sixth invention is the above-mentioned invention, in which the railway facility is a movable home gate in which a door portion is driven to open and close by the motor, a state monitoring device.

[0022] According to the sixth invention, it becomes possible to accurately detect an abnormality in the movable home gate.

Brief Description of the Drawings

[0023] [Figure 1] A configuration example of a movable home gate. [Figure 2] An example of a motor current waveform. [Figure 3] A schematic waveform of the driving frequency of the motor. [Figure 4] An example of calculating an integrated current value. [Figure 5] An example of the relationship between envelope detection of the motor current value and the ambient temperature. [Figure 6] An example of abnormality determination based on the change rate of the integrated current value. [Figure 7] A functional configuration example of the state monitoring device. [Figure 8] A flowchart of the state monitoring process.

Modes for Carrying Out the Invention

[0024] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Note that the form to which the present invention is applicable is not limited to the following embodiments. Also, in the description of the drawings, the same reference numerals are given to the same elements.

[0025] Figure 1 is a front view showing the schematic configuration of the movable platform screen door that the status monitoring device 1 of this embodiment monitors. Figure 1 shows a pair of left and right movable platform screen doors 10 (10a, 10b) that open and close one opening. Multiple movable platform screen doors 10 are arranged and installed along the longitudinal direction of the platform 3 on the track side edge, separating the platform 3 from the track side. The movable platform screen door 10 has a configuration in which a door pocket section 11 fixedly installed on the platform 3 supports and drives the door sections 12, which are movable doors, to open and close. In accordance with the arrival of a train, the door sections 12 are moved forward and backward along the longitudinal direction of the platform 3, which is the opening and closing direction, thereby opening and closing the opening that serves as the boarding area for the train.

[0026] In other words, the movable platform screen door 10, for example, moves the door section 12 from a closed state to an open state to open the opening, and then stops moving the door section 12. Next, it moves the door section 12 in a closing state to close the opening, and then stops moving the door section 12. In this way, the movable platform screen door 10 performs intermittent operation to open and close the opening by driving the door section 12 with the motor 141.

[0027] Specifically, the movable platform screen door 10 includes a linear motion guide unit 13 that guides the door section 12 in the opening and closing direction, a door drive unit 14 that drives the door section 12 to move forward and backward, and a control device 20 that performs control related to the movable platform screen door 10, including driving the door drive unit 14, according to a control signal from an external device. The linear motion guide unit 13 and the door drive unit 14 are the mechanisms related to driving by a motor 141.

[0028] The linear guide section 13 is composed of blocks 132 and 133 provided in the door pocket section 11 and a guide rail 131 provided in the door section 12, and is a linear guide mechanism in which the guide rail 131 slides relative to the installation positions of the blocks 132 and 133. Furthermore, the load of the door section 12 is supported by this linear guide section 13, and the forward and backward movement of the door section 12 in the opening and closing direction is guided.

[0029] The guide rail 131 is slidably engaged with blocks 132 and 133. A linear guide of the rolling type can be used for the linear guide section 13. The two blocks 132 and 133 have ball bearings (not shown) interposed between them and the guide rail 131 that roll during sliding. In addition, a lubricant such as grease is applied to the blocks 132, 133 and / or the guide rail 131 to ensure smooth sliding.

[0030] The door drive unit 14 is implemented by, for example, a belt drive mechanism and comprises a motor 141 located inside the door pocket 11, a drive pulley 142 connected to the output shaft of the motor 141, a driven pulley 143 located near the entrance of the door 12, a timing belt 144 wound around these pulleys 142 and 143, and a belt clamp 145 provided at a predetermined position on the door 12 to connect and fix the timing belt 144 and the door 12.

[0031] The left and right pair of movable platform gates 10 (10a, 10b) related to a single opening are basically identical in their drive mechanism configuration, except that they are symmetrical. The door sections 12 (12a, 12b) are controlled to open and close simultaneously. The control device 20 that controls the left and right pair of movable platform gates 10 (10a, 10b) related to a single opening is provided in one of the movable platform gates 10 (10a, 10b) (movable platform gate 10a in Figure 1).

[0032] The control device 20 outputs a drive control signal to the drive circuit (not shown) of one motor 141a to drive one door section 12a in the opening or closing direction, in accordance with an opening / closing command from an external device, and outputs a drive control signal to the drive circuit (not shown) of the other motor 141b to drive the other door section 12b in the opening or closing direction. As a result, the doors 12a and 12b are controlled to open and close simultaneously.

[0033] The condition monitoring device 1 of this embodiment measures the motor current, which is the current supplied to the motor 141 and is an electrical characteristic value, to obtain the motor current value, and monitors the condition of the movable platform gate 10 based on the obtained motor current value. Specifically, the monitoring item is to determine any abnormalities or signs thereof related to the drive mechanism of the door section 12 (hereinafter simply referred to as "abnormalities").

[0034] Motor 141 is a three-phase AC motor. The power supply cable for the three-phase drive power supplied to motor 141 is equipped with a current sensor that measures the current (motor current). The current sensor measures the current of two of the three phases (for example, U-phase and V-phase). By measuring the current of two phases, it is also possible to determine the rotation direction of the motor, that is, whether the door section 12 is being driven to open or close.

[0035] The status monitoring device 1 determines whether the movable platform gate 10 (10a, 10b) is operating, that is, whether the door section 12 is being controlled to open or close, based on whether the measured motor current value exceeds a predetermined threshold for each movable platform gate 10 (10a, 10b). It also determines the direction of operation of the door section 12 (opening or closing). The device then acquires the motor current value during the operation period of one intermittent operation (opening or closing of the door section 12). Based on the acquired motor current value, it determines an abnormality in the movable platform gate 10 according to the direction of operation of the door section 12.

[0036] The operating direction of the door section 12 can be determined, for example, from the motor current waveform during the opening and closing operation of the door section 12. There are characteristic differences in the motor current waveform (more specifically, the detected motor current waveform shown in Figure 4, which will be described later) between the opening and closing operations of the door section 12. Therefore, by generating and preparing reference waveforms based on the motor current waveforms for the opening and closing operations of the door section 12 in advance, and comparing the motor current waveform acquired during the operating period with these reference waveforms, the operating direction of the door section 12 can be determined.

[0037] Alternatively, a drive control signal for driving the door section 12 in the opening or closing direction may be obtained from the control device 20 that controls the movable platform gate 10, and the presence or absence of opening / closing control for the door section 12 and the direction of operation may be determined from this drive control signal.

[0038] Figure 2 shows an example of a motor current waveform, which is represented by the motor current value during one operating period of the movable platform screen door 10. Figure 2 shows the motor current waveform for one phase. The horizontal axis represents time, and the vertical axis represents the current value. The motor current is a waveform that fluctuates according to the load on the motor 141, that is, the load associated with the movement of the door section 12. In addition, when the motor 141 is started, an inrush current corresponding to the starting torque is generated. The condition monitoring device 1 divides one operating period into multiple judgment periods. For each judgment period, it evaluates the difference between the motor current value and the reference current value for that period, and determines an abnormality in the movable platform screen door 10 based on whether the evaluation results of the judgment periods meet predetermined approximation conditions.

[0039] Specifically, as shown in Figure 2, the period of one operation cycle, excluding the motor 141 startup period, is divided into three parts according to the motor 141's speed range: acceleration range, constant speed range, and deceleration range, and these are set as judgment periods. The motor 141's speed range is determined by performing frequency analysis on the motor current waveform. For example, Fourier analysis or wavelet transform can be used for the frequency analysis. By performing frequency analysis on the motor current waveform, a waveform of the drive frequency, such as the schematic waveform shown in Figure 3, is obtained.

[0040] Figure 3 shows a schematic waveform of the motor's drive frequency during one operating period. In Figure 3, the horizontal axis represents time, and the vertical axis represents frequency. As shown in Figure 3, the drive frequency of the motor 141 during one operating period is divided into three speed regions: an acceleration region in which the frequency increases after the motor 141 is started, a constant speed region in which the frequency is kept approximately constant after reaching a predetermined frequency to become a steady-state frequency, and a deceleration region in which the frequency decreases to stop the motor 141.

[0041] The condition monitoring device 1 calculates an integrated current value by accumulating the current values ​​during each judgment period in the operation period of the movable platform gate 10. Figure 4 is a diagram illustrating an example of the calculation of the integrated current value. Figure 4 shows an example of calculating the integrated current value for the motor current waveform shown in Figure 2. As with Figure 2, the horizontal axis is time and the vertical axis is current value. Since the motor current value is the current value for one phase of a three-phase AC, envelope detection is performed for the positive value, and the motor current value after envelope detection is accumulated for each judgment period to calculate the integrated current value. In other words, the area between the horizontal axis (time axis) where the motor current value is 0 (zero) and the envelope in Figure 4 corresponds to the integrated current value.

[0042] Next, for each judgment period, the rate of change (increase / decrease) of the integrated current value is calculated relative to a reference integrated current value obtained by accumulating the motor current values ​​for the judgment period in the previous operating period. Then, an abnormality of the movable platform gate 10 is determined based on whether the rate of change of the integrated current value for each judgment period satisfies predetermined approximation conditions. The approximation conditions are conditions under which the rate of change can be considered to be approximate, and are defined, for example, that the difference in the rate of change is within a predetermined number of percent (for example, within ±10%).

[0043] The motor current fluctuates according to the load on the motor 141, which is mainly the load related to the movement of the door section 12. The linear motion guide section 13 is coated with a lubricant such as grease to ensure the smooth movement of the door section 12, but this lubricant has temperature characteristics. Therefore, depending on the ambient temperature, such as low temperatures, the sliding resistance related to the movement of the door section 12 increases, and this sliding resistance places a large load on the motor 141, meaning the motor current value increases.

[0044] Figure 5 illustrates the relationship between the waveform obtained by envelope detection of the motor current value during a single operation and the ambient temperature. In Figure 5, the horizontal axis represents time and the vertical axis represents the current value, showing the waveform obtained by envelope detection of the motor current value during multiple operation periods with different ambient temperatures. As shown in Figure 5, there is almost no difference in the inrush current at startup due to differences in ambient temperature during the operation period, but for periods other than startup (acceleration, constant speed, and deceleration), it can be seen that the motor current value tends to increase as the ambient temperature decreases. This increase in the motor current value is such that the waveform shape is stretched in the increasing direction throughout the acceleration, constant speed, and deceleration regions. From this, if the rate of change when comparing the integrated current value obtained by integrating the motor current values ​​over different judgment periods satisfies the approximation condition, the movable platform screen door 10 can be determined to be normal.

[0045] On the other hand, if some abnormality occurs in the mechanism related to the drive of the motor 141, such as sand adhering to a part of the guide rail 131, and the sliding resistance related to the movement of the door section 12 increases significantly, the load on the motor 141 will also increase significantly. However, this increase in load occurs at a specific point in the operation period, such as when the part of the guide rail 131 with sand adhering to it comes into contact with the blocks 132 and 133. In other words, only the cumulative current value changes (increases) significantly during a portion of the judgment period into which the operation period is divided.

[0046] Therefore, by comparing and evaluating the rate of change of the cumulative current value during each judgment period for each operating direction of the door section 12, it becomes possible to distinguish and determine whether the change (increase) in motor current is due to a change in the sliding characteristics related to the movement of the door section 12 due to ambient temperature, or due to a malfunction of the movable platform gate 10.

[0047] Furthermore, the timing of the operation of each part of the mechanism differs within a single operating period. Therefore, when an abnormality is detected in the movable platform screen door 10, the abnormal part of the mechanism can be estimated based on which timing within the operating period corresponds to the period during which the abnormality was determined.

[0048] Figure 6 illustrates the abnormality detection of the movable platform screen door 10 based on the rate of change of the cumulative current value for multiple opening and closing operations of the door section 12 in the same direction. In Figure 6, the horizontal axis represents the passage of time, and the vertical axis represents the cumulative current value. In Figure 5, for each of three operation periods in chronological order under conditions where the temperature is gradually decreasing, the cumulative current value for each of the three judgment periods—acceleration, constant speed, and deceleration—is shown as a bar graph.

[0049] In the example shown in Figure 6, evaluating the difference in the cumulative current values ​​between the same judgment periods in the Xth and Yth operating periods, the rate of change of the cumulative current value in the Yth period relative to the cumulative current value in the Xth period is +10% (10% increase) in both judgment periods, satisfying the approximation condition. Therefore, the change (increase) in motor current is estimated to be due to a change (decrease) in ambient temperature, and the movable platform screen door 10 is judged to be normal.

[0050] Furthermore, evaluating the difference in the cumulative current values ​​between the same judgment periods in the Yth and Zth operating periods, the rate of change of the cumulative current value in the Zth operating period relative to the cumulative current value in the Yth operating period is +3% (3% increase) in the acceleration and deceleration regions, but +15% (15% increase) in the constant speed region, which does not satisfy the approximation condition. Therefore, the movable platform screen door 10 is determined to be abnormal. Moreover, while the rate of change in the acceleration and deceleration regions satisfies the approximation condition, the rate of change in the constant speed region is larger than that in the acceleration and deceleration regions. Therefore, it is presumed that some kind of abnormality has occurred in a part related to the constant speed region. For example, it can be estimated that there is a possibility that the cause of the abnormality lies in the central part of the guide rail 131.

[0051] Figure 7 is a block diagram showing an example of the functional configuration of the status monitoring device 1. As shown in Figure 7, the status monitoring device 1 comprises an operation unit 102, a display unit 104, a communication unit 106, a processing unit 200, and a storage unit 300, and is configured as a type of computer system.

[0052] The operation unit 102 is implemented by an input device such as a button switch or a touch panel, and outputs an operation signal to the processing unit 200 according to the operation performed. The display unit 104 is implemented by a display device such as an LCD (Liquid Crystal Display) or a touch panel, and displays various information according to the display signal from the processing unit 200. The communication unit 106 is implemented by a wireless or wired communication device, and communicates with external devices such as the control device 20 of the movable platform screen door 10 via a given communication network.

[0053] The processing unit 200 is implemented by an arithmetic unit such as a CPU (Central Processing Unit), and based on programs and data stored in the storage unit 300, it issues instructions and transfers data to each part that makes up the status monitoring device 1, thereby performing overall control of the status monitoring device 1.

[0054] Furthermore, the processing unit 200 performs a process to monitor the state of the movable platform gate 10, which is a railway facility that operates intermittently driven by the motor 141, by executing a state monitoring program 302 stored in the storage unit 300 (see Figure 8). The processing unit 200 has, as functional processing blocks, an acquisition unit 202, a calculation unit 204, a difference evaluation unit 206, a determination unit 208, an abnormality location estimation unit 210, a reference characteristic value setting unit 212, and a determination period setting unit 214. Each of these functional units of the processing unit 200 can be implemented in software by the processing unit 200 executing a program, or by a dedicated calculation circuit. In this embodiment, the former, software implementation, will be described.

[0055] The acquisition unit 202 acquires the motor current value, which is the driving electrical characteristic value of the motor 141 during one operating period of the movable platform gate 10.

[0056] Specifically, via the communication unit 106, the current values ​​(two of the three phases) measured by a current sensor installed on the power supply cable of the three-phase drive power supplied to the motor 141 from the control device 20 of the movable platform screen door 10, or by a current sensor installed on the power supply line on the printed circuit board, are acquired. Then, based on whether the acquired motor current value exceeds a predetermined threshold, it is determined whether the movable platform screen door 10 is operating, that is, whether the door section 12 is being controlled to open or close. The motor current value for the duration of one intermittent operation (opening or closing of the door section 12) is acquired (see Figure 2). The acquired motor current values ​​are stored in the storage unit 300 as motor current value data 310, associated with an identification ID and the operating direction of the door section 12 for each operating period.

[0057] The calculation unit 204 calculates electrical characteristic statistics by performing predetermined statistical calculations on the motor current, which is the driving electrical characteristic value during each of the predetermined judgment periods obtained by dividing the operating period into a plurality of predetermined judgment periods. Specifically, it calculates the integrated current value obtained by accumulating the motor current during the judgment period as the electrical characteristic statistics (see Figure 4).

[0058] The difference evaluation unit 206 evaluates the difference between the integrated current value, which is an electrical characteristic statistical value, and the reference integrated current value, which is a given reference characteristic value for the judgment period, for each judgment period.

[0059] Specifically, for each judgment period, the rate of change (increase / decrease rate) of the integrated current value relative to the standard integrated current value is calculated (see Figure 5).

[0060] The determination unit 208 determines an abnormality in the movable platform gate 10 based on whether the evaluation results for each determination period performed by the difference evaluation unit 206 satisfy predetermined approximation conditions.

[0061] Specifically, for each operating direction of the door section 12, an abnormality in the movable platform screen door 10 is determined based on whether the rate of change of the accumulated current value for each judgment period satisfies predetermined approximation conditions. That is, if the approximation conditions are met, it is determined that there is no abnormality, and if the approximation conditions are not met, it is determined that there is an abnormality. The approximation conditions are conditions under which the rate of change can be considered to be approximate, and can be defined as, for example, that the difference in the rate of change is within a predetermined number of percent (for example, within ±10%) (see Figure 5). The calculated rate of change for each judgment period may also be output externally via the display unit 104 or the communication unit 106 to be presented to the user.

[0062] The abnormal part estimation unit 210 estimates the abnormal part of the mechanism based on the judgment period that does not satisfy the approximation conditions among a plurality of judgment periods.

[0063] Specifically, for each judgment period, which is a division of a single operating period, the working / operating parts of the mechanism are predetermined, and the part corresponding to the judgment period that was determined to be abnormal is estimated to be the abnormal part.

[0064] The reference characteristic value setting unit 212 sets the reference integrated current value based on the motor current for each judgment period during past operating periods.

[0065] Specifically, for each operating direction of the door section 12, a reference integrated current value, which is the cumulative value of the motor current value during the corresponding determination period in the previous operating period, is set as a reference characteristic value (see Figure 5). For example, after the determination unit 208 determines that the movable platform gate 10 is normal based on the motor current during one operating period, the integrated current value based on the motor current value during that operating period is updated and set as a new reference characteristic value for the corresponding operating direction. The set reference integrated current value is stored in the storage unit 300 as reference integrated current value data 320.

[0066] Furthermore, the reference characteristic value may be a statistically calculated value such as the average of the cumulative current values ​​for the corresponding judgment period in each of the past multiple operating periods, or the reference characteristic value may be the cumulative current value for the corresponding judgment period during the operating period when the device is tested during maintenance or daily pre-operation checks. In addition, each time the movable platform screen door 10 operates multiple times, the reference characteristic value may be the cumulative current value for the corresponding judgment period in the last operating period.

[0067] The judgment period setting unit 214 sets multiple judgment periods by dividing the operating period according to the speed range of the motor 141.

[0068] Specifically, the period excluding the start-up time of the motor 141 is divided into three zones corresponding to the speed range of the motor 141: an acceleration zone, a constant speed zone, and a deceleration zone, and these zones are set as judgment periods. The acceleration zone is the speed range in which the rotational speed of the motor 141 is gradually increased after it starts up; the constant speed zone is the speed range in which the motor 141 maintains a predetermined rotational speed after it reaches that speed; and the deceleration zone is the speed range in which the rotational speed is gradually decreased to stop the motor 141 (see Figure 3).

[0069] The storage unit 300 is implemented using a storage device such as a hard disk, ROM (Read Only Memory), or RAM (Random Access Memory). It stores programs and data for the processing unit 200 to comprehensively control the status monitoring device 1, and is also used as a workspace for the processing unit 200. Calculation results performed by the processing unit 200 according to various programs are temporarily stored there. In this embodiment, the status monitoring program 302, motor current value data 310, and reference integrated current value data 320 are stored.

[0070] Figure 8 is a flowchart illustrating the flow of the status monitoring process for monitoring the status of the movable platform gate 10. This process is executed by the processing unit 200 of the status monitoring device 1 and is performed for each operation of the movable platform gate 10 (opening or closing of the door section 12).

[0071] As shown in Figure 8, first, the acquisition unit 202 acquires the current value of the motor 141 (motor current value) during one operation period of the movable platform gate 10 from the control device 20 of the movable platform gate 10 (step S1). Next, the determination period setting unit 214 sets multiple determination periods by dividing the operation period according to the speed range of the motor 141 based on the acquired motor current value (step S3).

[0072] Next, the calculation unit 204 calculates an integrated current value by accumulating the motor current values ​​during each judgment period (step S5). Then, the difference evaluation unit 206 calculates the rate of change by comparing the integrated current value with the corresponding reference integrated current value for each judgment period (step S7). The rate of change is an example of a difference. Then, the determination unit 208 determines an abnormality in the movable platform gate 10 based on whether or not predetermined approximation conditions are met by comparing the rate of change of the integrated current value for each judgment period (step S9). After performing the above processing, the status monitoring process is completed.

[0073] According to this embodiment, it is possible to accurately detect abnormalities in the movable platform screen door 10, which operates intermittently by the opening and closing of the door section 12 driven by the motor 141. In particular, it is possible to accurately detect abnormalities in railway equipment installed in environments where the ambient temperature changes.

[0074] Even if there is no abnormality in the door drive unit 14 that drives the door section 12, if the sliding resistance related to the movement of the door section 12 increases due to changes in ambient temperature, the load on the motor 141 may increase. However, the change in motor current due to this increase will be a change that occurs throughout the entire operating period. Therefore, if we evaluate the difference between the cumulative current value obtained by accumulating the motor current values ​​for each judgment period, which is defined as one operating period, and the reference cumulative current value obtained by accumulating the motor current values ​​when the movable platform screen door 10 is functioning normally, the differences for each judgment period will be approximate. From this, it becomes possible to distinguish whether the change (increase) in the motor current value is due to an abnormality in the door drive unit 14 or due to the temperature characteristics of the sliding resistance related to the movement of the door section 12, and it becomes possible to detect abnormalities in the movable platform screen door 10 with high accuracy.

[0075] Furthermore, even if the movable platform screen door 10 is functioning correctly, the waveform of the motor current value may not be perfectly consistent and may differ from one operating period to the next. Therefore, by using the accumulated current value obtained by accumulating the motor current values ​​for the judgment process, it becomes possible to efficiently evaluate the difference from the reference accumulated current value for each judgment period.

[0076] It should be noted that the applicable embodiments of the present invention are not limited to those described above, and can be modified as appropriate without departing from the spirit of the invention.

[0077] (A) Judgment period In the above embodiment, the operation period was divided into three judgment periods: an acceleration period, a constant speed period, and a deceleration period. However, the number of judgment periods is not limited to these; there may be two, four or more, or any number of judgment periods. Alternatively, the judgment periods may be set in correspondence with speed regions that are divided into stages based on the rotational speed (frequency) of the motor 141.

[0078] (B) Drive electrical characteristics Furthermore, in the above embodiment, the driving electrical characteristic value of the motor 141 was used as the motor current value, but it may also be used as the motor power value or motor torque value.

[0079] (C) Railway equipment under surveillance In the above-described embodiment, a condition monitoring device 1 was described for monitoring the movable platform screen door 10. However, the railway equipment to be monitored is not limited to the movable platform screen door 10. For example, it is also possible to configure a condition monitoring device 1 to monitor other railway equipment such as a switch that intermittently performs normal position switching / reverse position switching operations by motor drive, or a barrier that intermittently performs raising / lowering operations of the barrier arm by motor drive. [Explanation of Symbols]

[0080] 1...Condition monitoring device 200... Processing Unit 202…Acquisition Department 204...Calculation section 206...Difference Evaluation Department 208...Judgment section 210…Abnormal region estimation unit 212...Reference characteristic value setting unit 214... Judgment period setting section 300...Storage section 302...Status monitoring program 310…Motor current value data 320…Reference integrated current value data

Claims

1. An acquisition means for acquiring the driving electrical characteristic value of a motor during a single operating period of railway equipment that is driven by a motor and operates intermittently, A calculation means that divides the operating period into a predetermined number of determination periods, and for each determination period, performs a predetermined statistical calculation on the drive electrical characteristic value during that determination period to calculate an electrical characteristic statistical value, Difference evaluation means for evaluating the difference between the electrical characteristic statistical value and a given reference characteristic value for each of the aforementioned determination periods, A determination means for determining abnormalities in the railway equipment based on whether the evaluation results for each determination period by the difference evaluation means satisfy predetermined approximation conditions, A condition monitoring device equipped with the following features.

2. An abnormal part estimation means for estimating an abnormal part of a mechanism driven by the motor based on the determination period among the plurality of determination periods that does not satisfy the approximation condition, The condition monitoring device according to claim 1, further comprising:

3. Reference characteristic value setting means for setting the reference characteristic value based on the drive electrical characteristic value for each determination period in the past operating period, The condition monitoring device according to claim 1, further comprising:

4. The calculation means calculates the integrated value obtained by accumulating the drive electrical characteristic values ​​during the determination period as the electrical characteristic statistical value. The status monitoring device according to claim 1.

5. A determination period setting means for setting the plurality of determination periods by dividing the operation period according to the speed range of the motor, The condition monitoring device according to claim 1, further comprising:

6. The aforementioned railway equipment is a movable platform screen door whose door section is driven to open and close by the motor. A condition monitoring device according to any one of claims 1 to 5.

7. A condition monitoring method for monitoring the status of railway equipment that is driven by a motor and operates intermittently, To obtain the driving electrical characteristic values ​​of the motor during one operating period of the aforementioned railway equipment, The operating period is divided into a predetermined number of determination periods, and for each determination period, a predetermined statistical calculation is performed on the drive electrical characteristic value during that determination period to calculate the electrical characteristic statistical value. For each of the aforementioned judgment periods, the difference between the electrical characteristic statistical value and a given reference characteristic value for that judgment period is evaluated. An abnormality in the railway equipment is determined based on whether the results of the evaluation for each of the aforementioned determination periods satisfy predetermined approximate conditions. A status monitoring method that includes this.

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