Life estimation device for winch and life estimation method for winch

Abstract

The invention provides a service life estimation device and a service life estimation method of a winch. The embodiment of the invention relates to a service life estimation device of a winch and a service life estimation method of the winch. And estimating the service life of the winch. According to the embodiment, the life estimation device of the winch applies a test voltage to a stator constituting the winch, measures a discharge level discharged from the stator to which the test voltage is applied, and estimates the change of the insulation degradation degree of the stator according to data indicating a plurality of discharge levels measured at predetermined intervals.

Description

This application is based on Japanese Patent Application No. 2023-199590 filed on November 27, 2023, and claims priority therefrom. This application incorporates the entire contents of that application by reference. Technical Field

[0001] An embodiment of the present invention relates to a life estimation device for a hoist and a method for estimating the life of a hoist. Background Art

[0002] The life of the motor of the hoist that constitutes the elevator equipment is about 20 years. Maintenance of the hoist is carried out based on this life.

[0003] However, the degree of deterioration of the hoist of the elevator device varies greatly depending on operating conditions such as the usage frequency of the elevator, the weight of the passengers, and the temperature of the place where the elevator is installed. Therefore, the life of the hoist is sometimes longer than the assumed 20 years. On the other hand, in the case of severe operating conditions, the life of the hoist is sometimes shorter than 20 years.

[0004] In order to maintain a large equipment such as a hoist, it becomes a large operation including the moving-in operation, so the time when the elevator device cannot be used becomes longer. Since it is rare to stock a spare hoist, if the hoist fails earlier than the expected life, the period during which the elevator device cannot be used, including the preparation time for the hoist, becomes longer.

[0005] Most of the failures of the hoist are caused by the deterioration of the insulation resistance of the stator of the motor that constitutes the hoist. Although a method for checking the degree of deterioration of the insulation resistance of the motor stator is disclosed, a method for estimating the life of the hoist is not disclosed. Summary of the Invention

[0006] The present invention has been made in view of the above circumstances, and an object thereof is to estimate the life of a hoist.

[0007] The life estimation device for a hoist according to an embodiment for solving the above problems applies a test voltage to the stator constituting the hoist, measures the discharge level of the stator to which the test voltage is applied, and estimates the transition of the insulation deterioration degree of the stator based on data representing a plurality of discharge levels measured at regular intervals. Thus, the life estimation device for a hoist according to the embodiment can estimate the life (replacement time) of the hoist. Brief Description of the Drawings

[0008] Figure 1 It is a perspective view of the elevator device of the present embodiment. Figure 2 It is a block diagram showing the control system of the elevator device of the present embodiment. Figure 3This is a diagram for explaining the measurement of the insulation resistance of the stator of the hoist constituting the present embodiment. Figure 4 This is a physical block diagram of the control unit of the present embodiment. Figure 5 This is a functional block diagram of the control unit of the present embodiment. Figure 6 This is a flowchart for explaining the operation status evaluation process of the present embodiment. Figure 7 This is a diagram for explaining the operation status evaluation process of the present embodiment. Figure 8 This is a diagram for explaining the operation status evaluation process of the present embodiment. Figure 9 This is a flowchart for explaining the life estimation process of the present embodiment. Figure 10 This is a diagram for explaining the life estimation process of the present embodiment. Detailed Embodiment

[0009] Hereinafter, the present embodiment will be described with reference to the drawings. In the description, the XYZ coordinate system composed of the mutually orthogonal X-axis, Y-axis, and Z-axis is appropriately used. The drawings and flowcharts used in the description of the present embodiment show an example.

[0010] Figure 1 This is a perspective view of the elevator device 10 of the present embodiment. The elevator device 10 is disposed inside a hoistway 100 provided in a building such as a commercial facility or a residential facility. As Figure 1 shown, the elevator device 10 includes a passenger car 31, a counterweight 45, a hoist 40, guide rails 21 to 24, and a control panel 90 (elevator control device).

[0011] The guide rails 21 to 24 are members whose longitudinal direction is the Z-axis direction. The guide rails 21 and 22 are a pair of members for guiding the passenger car 31 to move up and down freely. In addition, the guide rails 23 and 24 are a pair of members for guiding the counterweight 45 to move up and down freely. The guide rails 21 and 22 are arranged separately in the Y-axis direction. In addition, the guide rails 23 and 24 are also arranged separately from each other in the Y-axis direction. In Figure 1 the guide rails 23 and 24 of the counterweight 45 are arranged separately from the guide rails 21 and 22 of the passenger car 31 in the X-axis direction. In addition, the arrangement of the guide rails 21 to 24 is not limited to Figure 1 the arrangement shown.

[0012] The passenger car 31 is a unit that accommodates users and moves up and down in the hoistway 100. The passenger car 31 is disposed between the guide rails 21 and 22 and is mounted on the guide rails 21 and 22 so as to be movable in the vertical direction.

[0013] On the side of the +X side of the passenger car 31, an opening 31a for entering and exiting the interior is formed. The opening 31a is closed or opened by a pair of doors 32 that move along the side of the passenger car 31. The doors 32 are opened and closed by an opening and closing motor (not shown in Figure 1 the figure).

[0014] The counterweight 45 is mounted on the guide rails 23 and 24 so as to be movable in the vertical direction. The weight of the counterweight 45 is adjusted to a specified ratio with respect to the weight of the passenger car 31.

[0015] The hoist 40 is a motor for raising and lowering the passenger car 31. The hoist 40 is arranged at the upper part of the hoistway 100 with its rotation axis parallel to the Y-axis. A pulley 42 is fixed to the rotation axis of the hoist 40.

[0016] A cable 43 is wound around the pulley 42 of the hoist 40. One end of the cable 43 is fixed to the passenger car 31, and the other end is fixed to the counterweight 45.

[0017] The control panel 90 is arranged on the hoistway 100. A control device for controlling the hoist 40, the equipment provided on the passenger car 31, etc. is accommodated in the control panel 90.

[0018] Figure 2 is a block diagram showing the control system of the elevator device 10. The control system is configured to include a control unit 80 and a drive unit 91 accommodated in the control panel 90, an operation panel 36 and a load sensor 39 provided in the passenger car 31.

[0019] The operation panel 36 is provided on the inner wall surface of the passenger car 31. The operation panel 36 is an interface for receiving the destination floor, etc. from the user of the passenger car 31. By operating the operation panel 36, the user can register the destination floor, etc. of the passenger car 31 and open and close the doors 32. The load sensor 39 is a device for measuring the load of the passenger car 31. The above operation panel 36 and load sensor 39 are connected to the control unit 80 accommodated in the control panel 90 via Figure 1 the cable 44 shown.

[0020] Figure 2 The drive unit 91 shown supplies power to the hoist 40 and the opening and closing motor 41 for driving the doors 32 of the passenger car 31 (not shown in Figure 1 the figure), thereby driving the hoist 40 and the opening and closing motor 41. The drive unit 91 drives the hoist 40 according to an instruction from the control unit 80. In addition, the drive unit 91 drives the opening and closing motor 41 according to an instruction from the control unit 80.

[0021] Here, a device for measuring the insulation resistance of the stator 60 that constitutes the hoist 40 will be described. Figure 3 This is a diagram for explaining the measurement of the insulation resistance of the stator 60 that constitutes the hoist 40. For example, when the hoist 40 is composed of a three-phase motor, the number of stators 60 of the hoist 40 is 3 or an even multiple of 3. In Figure 3 one of the multiple stators 60 that constitute the hoist 40 is described. In the measurement of the insulation resistance of the stator 60, a signal generation device 51 and a measurement device 52 are used. In addition, a temperature measurement device 53 and a current measurement device 54 are arranged on the hoist 40. The temperature measurement device 53 is used to measure the temperature of the stator 60 that constitutes the hoist 40, and the current measurement device 54 measures the current supplied to the hoist 40. When measuring the insulation resistance of the stator 60 of the opening and closing motor 41, the signal generation device 51, the measurement device 52, the temperature measurement device 53, and the current measurement device 54 are also arranged on the opening and closing motor 41.

[0022] The signal generation device 51 is a device for applying a test voltage to the stator 60. The test voltage is, for example, a pulse voltage. The signal generation device 51 can change the output voltage level. In Figure 3 it is described that a test voltage is applied between one end 61 of the stator 60 and the ground, but there are also cases where a test voltage is applied between one end 61 and the other end 62 of the stator 60, and there are also cases where a test voltage is applied between multiple stators that constitute the hoist 40.

[0023] The measurement device 52 is a device for measuring the discharge level discharged from the stator 60. The measurement device 52 has an antenna unit 521 and a processing unit 522. The antenna unit 521 is arranged near the stator 60 to be measured and receives the discharge level (electromagnetic wave) discharged from the stator 60. The processing unit 522 digitizes the discharge level received by the antenna unit 521 and notifies it to the control unit 80. The processing unit 522 is configured to include an A / D converter.

[0024] Figure 4is a physical block diagram of the control unit 80. The control unit 80 is a computer having a CPU (Central Processing Unit) 81, a main storage unit 82, an auxiliary storage unit 83, and an interface unit 84 that are interconnected via a bus 85. The CPU 81 executes the processes described later according to the programs stored in the auxiliary storage unit 83. The main storage unit 82 includes a RAM (Random Access Memory) and the like. The main storage unit 82 serves as the working area for the CPU 81. The auxiliary storage unit 83 includes non-volatile memories such as a ROM (Read Only Memory) and a semiconductor memory. The auxiliary storage unit 83 stores the programs executed by the CPU 81 and various parameters and the like.

[0025] The interface unit 84 includes a serial interface, a parallel interface, a wireless LAN interface, and the like. The operation panel 36, the load sensor 39, the signal generation device 51, the measurement device 52, the temperature measurement device 53, the current measurement device 54, and the drive unit 91 are connected to the CPU 81 via the interface unit 84. In addition, an input / output device 93 composed of a keyboard, a display, and the like is connected to the interface unit 84.

[0026] Figure 5 is a functional block diagram of the control unit 80. The CPU 81 of the control unit 80 implements a drive unit control unit 71 and a life estimation device 72 by executing the programs stored in the auxiliary storage unit 83.

[0027] The drive unit control unit 71 controls the drive unit 91 according to inputs from the operation panel 36 or the call panels on each floor. For example, when the drive unit control unit 71 rotates the hoist 40 forward via the drive unit 91, the passenger car 31 ascends and the counterweight 45 descends. When the drive unit control unit 71 rotates the hoist 40 in reverse via the drive unit 91, the passenger car 31 descends and the counterweight 45 ascends. In addition, when the drive unit control unit 71 rotates the opening / closing motor 41 forward via the drive unit 91, the doors 32 of the passenger car 31 and the doors in the landing halls on each floor are controlled to open, and when the opening / closing motor 41 is rotated in reverse, the doors 32 of the passenger car 31 and the doors in the landing halls on each floor are controlled to close.

[0028] The life estimation device 72 applies a test voltage to the stator 60 constituting the hoist 40, measures the discharge level of the stator 60 that discharges from the stator 60 to which the test voltage is applied, and estimates the change in the degree of insulation deterioration of the stator 60 based on the data representing a plurality of discharge levels measured at regular intervals. The life estimation device 72 includes an operating condition evaluation unit 76, a graph generation unit 77, and a life estimation unit 78.

[0029] The operating condition evaluation unit 76 evaluates the operating condition of the hoist 40 by accumulating the product of the value of the temperature measured by the temperature measuring device 53 and the duration of the temperature. The operating condition evaluation unit 76 evaluates the operating condition of the hoist 40 in consideration of parameters including the load of the passenger car 31 measured by the load sensor 39, the operating condition of the passenger car 31 (such as the lifting frequency and the lifting distance), and the temperature. The load and the operating condition of the passenger car 31 can also be evaluated, for example, by the current supplied to the hoist 40 measured by the current measuring device 54.

[0030] The graph generation unit 77 generates a graph showing the time progression of the future discharge level based on the data representing the multiple discharge levels measured within a specified period. When generating the graph, the graph generation unit 77 generates the graph based on the data of the operating condition of the hoist 40 generated by the operating condition evaluation unit 76.

[0031] The life estimation unit 78 estimates the replacement time of the hoist 40 as the date and time when the graph generated by the graph generation unit 77 becomes a value equal to or higher than a specified discharge level. Details will be described later.

[0032] Next, referring to Figure 6 the flowchart shown, the operating condition evaluation process performed by the operating condition evaluation unit 76 will be described. The following control is performed according to the program stored in the auxiliary storage unit 83, and the main body of the control is the CPU 81 of the control unit 80.

[0033] The operating condition evaluation unit 76 determines whether the passenger car 31 of the elevator device 10 is in operation (step S11). Being in operation means the period during which the hoist 40 operates. When the passenger car 31 is not in operation (step S11: No), it waits until the hoist 40 starts operating. On the other hand, when it is determined that the passenger car 31 is in operation (step S11: Yes), the operating condition evaluation unit 76 measures the temperature of the stator 60 by the temperature measuring device 53 (step S12). Step S12 is the temperature measurement process. The load applied to the hoist 40 is related to the power consumed by the hoist 40 according to the load of the passenger car 31 and the moving distance of the passenger car 31, and corresponds to the heat generation amount of the hoist 40.

[0034] Next, the operating condition evaluation unit 76 evaluates the operating condition of the hoist 40 (step S13). Step S13 is the operating condition evaluation process. Figure 7 (a) shows the load applied to the hoist 40. Figure 7 In (a), the vertical axis is the load applied to the hoist 40. The horizontal axis is time. The period when the load value is "0" is the period when the passenger car 31 is not in operation. The load applied to the hoist 40 corresponds to the load of the passenger car 31 measured by the load sensor 39.Figure 7 The (b) of which represents the operation time of the passenger car 31. The period of high level is the period when the passenger car 31 is operating, and the period of low level is the period when the passenger car 31 is not operating. The operating condition is evaluated based on the length of the period when the passenger car 31 is operating, the length of the period when the passenger car 31 is stopped, the operating frequency of the passenger car 31, the weight of the passenger car 31, etc. The calorific value of the hoist 40 is proportional to the load applied to the hoist 40. Figure 7 The (c) of which is an example of the temperature of the hoist 40 measured by the temperature measuring device 53. By Figure 7 The (a) to Figure 7 As can be seen from the (c) of which, the greater the load applied to the hoist 40, the greater the temperature rise of the hoist 40.

[0035] The value obtained by accumulating the temperature of the hoist 40 calculated by the operating condition evaluation unit 76. Figure 8 A graph representing the accumulated temperature of the hoist 40. For simplicity of explanation, the description of the temperature drop of the hoist 40 during the period when the passenger car 31 is not operating and the period when it is not running is omitted. Figure 8 The horizontal axis of which is time. The left vertical axis is temperature. Figure 8 The bar graph shown represents that the hoist 40 operates during the period of time t1 at temperature T1 and operates during the period of time ti at temperature Ti. The temperature during the period when the hoist 40 is not operating is also included in this bar graph. The temperature of the hoist 40 is a value reflecting the temperature of the environment where the hoist 40 is installed. The right vertical axis is the accumulated temperature. The line graph represents the value obtained by accumulating the areas of the bar graph (accumulated temperature). The line graph is obtained by successively adding the area of the bar graph during the time t1 period, then adding the area of the bar graph during the time t2 period, and then adding the area of the bar graph during the time t3 period, and so on. The larger the accumulated value of the temperature represented by the line graph, the more the hoist 40 operates. The greater the load applied to the hoist 40, the greater the current supplied to the hoist 40, and the greater the temperature rise of the hoist 40. That is, the accumulated temperature value obtained by accumulating the temperature of the hoist 40 can be said to be a parameter representing the operating condition of the hoist 40 considering parameters such as the load and operating condition of the passenger car 31. Therefore, the accumulated value of the temperature represented by the line graph is related to the aging degree of the hoist 40 over the years.

[0036] The operating condition evaluation unit 76 continues the processing from step S11 to step S13. When the hoist 40 is replaced, this line graph is reset. Therefore, the greater the operating time of the hoist 40 (the elapsed time after replacement), the greater the value of the accumulated temperature shown at the right end of the line graph. The life estimation device 72 stores the value of the accumulated temperature represented by the Figure 8 line graph shown in the storage unit. In addition, the life estimation device 72 outputs to the input / output device 93 Figure 8 the graph representing the accumulated temperature shown.

[0037] Next, with reference to Figure 9 the flowchart shown, the life estimation process performed by the life estimation device 72 will be described. The operation status evaluation process of the operation status evaluation unit 76 is performed successively each time the passenger car 31 moves up and down.

[0038] The life estimation device 72 determines whether a specified period has elapsed since the last insulation characteristic test of the hoist 40 was performed (step S31). The specified period is, for example, one month or six months. If the specified period has elapsed (step S31: Yes), the process proceeds to step S32, and an insulation characteristic test of the hoist 40 is performed. Specifically, using the signal generation device 51, for example, as Figure 3 shown, a test voltage is applied to the stator 60 constituting the hoist 40 (step S32). Then, the discharge level discharged from the stator 60 is measured by the measuring device 52 (step S33). The test voltage can be set to multiple voltage levels. For example, when the rated insulation voltage of the hoist 40 is 1000V, the applied voltage levels are set to 500V, 750V, and 1000V. Since the deviation of the measured values of the discharge level is large, the life estimation device 72 measures the discharge level multiple times (for example, 10 times) and records the maximum value Pmax of the measured values. In addition, during the normal up and down operation of the passenger car 31, the voltage applied to the hoist 40 is, for example, 10% or 20% of the absolute rated value of the hoist 40.

[0039] Next, the life estimation device 72 determines whether the measurement of the insulation characteristics of the hoist 40 has been completed for all the test voltages determined in advance (step S34). If the measurement of the insulation characteristics of the hoist 40 has not been completed for all the test voltages (step S34: No), the life estimation device 72 changes the voltage level of the test voltage output by the signal generation device 51 (step S35), and performs the processes of step S32 and step S33.

[0040] On the other hand, if the measurement of the insulation characteristics of the hoist 40 has been completed for all the test voltages (step S34: Yes), the life estimation device 72 determines whether an insulation characteristic test of the hoist 40 has been performed a specified number of times at specified intervals (step S36). The specified number of times is the number of times the insulation characteristics of the hoist 40 have been measured, for example, 10 times or 20 times. If the insulation characteristic test of the hoist 40 has not been performed the specified number of times (step S36: No), the life estimation device 72 returns the process to step S31. This is because when the measurement data is small, the accuracy of the generated graph decreases. In addition, since the probability that the stator 60 of the hoist 40 undergoes insulation deterioration leading to poor insulation is extremely low when not enough time has passed since the start of operation of the hoist 40.

[0041] On the other hand, when the insulation characteristic test of the hoist 40 has been carried out a specified number of times (step S36: Yes), the life estimation device 72 transfers the process to step S37. The graph generation unit 77 of the life estimation device 72 generates a graph showing the time progression of future discharge levels based on data representing a plurality of discharge levels measured at specified intervals (step S37). Step S37 is a graph generation process. For example, the graph generation unit 77 uses the least squares method or the like to generate an approximate formula for the graph representing the insulation deterioration characteristics of the hoist 40, and thereby generates a graph. The graph generation unit 77 generates a graph for each output voltage of the signal generation device 51.

[0042] Figure 10 It is a diagram for explaining the generation process of the diagram showing the insulation deterioration characteristics of the hoist 40. Figure 10 It is a diagram showing the value of the maximum value Pmax measured by the measuring device 52 when a specified application voltage (for example, 500 V) is applied from the signal generation device 51 to the hoist 40. Figure 10 The vertical axis of is the maximum value Pmax of the discharge level of the discharge from the stator 60 measured by the measuring device 52. The horizontal axis is the operating time of the hoist 40. Tab is the interval for measuring the insulation characteristics of the hoist 40, for example, 1 month or 6 months. The period Tab does not necessarily have to be the same period. In Figure 10 it, the maximum value Pmax of the discharge level measured at each interval of the period Tab is indicated by a ○ mark. The graph generation unit 77 generates a graph showing the time progression of the maximum value Pmax of the discharge level based on the measured values indicated by the ○ marks by the least squares method or the like.

[0043] When generating the graph shown in Figure 10 the graph generation unit 77 generates the graph in consideration of the value of the cumulative temperature calculated by the operating condition evaluation unit 76 shown in Figure 8 . Specifically, the graph generation unit 77 generates the graph such that the greater the value of the cumulative temperature of the hoist 40 at the time of graph generation, the greater the degree of deterioration of the insulation characteristics of the future hoist 40. For example, when the value of the cumulative temperature of the hoist 40 is large, the graph generation unit 77 generates the graph in such a way that the value of the future maximum value Pmax increases significantly, as shown by the dotted line curve A in Figure 10 . In addition, when the value of the cumulative temperature of the hoist 40 is small, as shown by the dashed line curve B in Figure 10 the graph generation unit 77 generates the graph in such a way that the value of the future maximum value Pmax increases less.

[0044] Next, the life estimation unit 78 of the life estimation device 72 performs an estimation process for the replacement timing of the hoist 40 (step S38). Step S38 is the replacement timing estimation process. Steps S37 and S38 are the life estimation processes. Specifically, the life estimation unit 78 estimates the replacement timing of the hoist 40 as the date and time when the chart generated by the chart generation unit 77 is a value equal to or greater than a specified discharge level that serves as a reference value. As Figure 10 shown, the life estimation unit 78 estimates the replacement timing A where curve A with a larger cumulative temperature value intersects the reference value as earlier than the replacement timing B where curve B with a smaller cumulative temperature value intersects the reference value. In addition, the reference value is a value that varies for each output voltage of the signal generation device 51.

[0045] The life estimation device 72 outputs the estimated replacement timing of the hoist 40 for the chart shown in Figure 10 to the input / output device 93.

[0046] As described above, the life estimation device 72 for the hoist according to the first embodiment includes: a chart generation unit 77 that generates a chart showing the time progression of future discharge levels based on data representing a plurality of measured discharge levels at regular intervals; and a life estimation unit 78 that estimates the date and time when the generated chart is a value equal to or greater than a specified discharge level as the replacement timing of the hoist 40. Thereby, the life estimation device 72 for the hoist according to the first embodiment can estimate the life (replacement timing) of the hoist 40.

[0047] In addition, the life estimation device 72 for the hoist according to the first embodiment includes: a temperature measurement device 53 that measures the temperature of the stator 60 constituting the hoist 40; and an operating condition evaluation unit 76 that evaluates the operating state of the hoist 40 by accumulating the value obtained by multiplying the temperature value measured by the temperature measurement device 53 by the duration of the temperature. The chart generation unit 77 generates a chart showing the time progression of the discharge level in consideration of the operating condition of the hoist 40 obtained by the operating condition evaluation unit 76. Thereby, the life estimation device 72 for the hoist according to the first embodiment can accurately estimate the life (replacement timing) of the hoist 40.

[0048] By knowing in advance the life (replacement timing) of the hoist 40, it is possible to prepare a new hoist before the hoist 40 fails, so that the period required for maintenance of the elevator device (the period during which the elevator device cannot be used), including the time for preparing the hoist, can be shortened. In addition, since maintenance can be performed before the hoist 40 fails, by setting the maintenance time to nighttime or the like, the inconvenience to users can be reduced.

[0049] The degree of deterioration of the hoist of the elevator device varies greatly depending on operating conditions such as the usage frequency of the elevator, the weight of passengers, and the temperature of the place where the elevator is installed. Therefore, the lifespan of the hoist is sometimes longer than the assumed lifespan. Replacing a hoist with a small degree of deterioration will result in over-quality and become the main cause of increased operating costs. By estimating the lifespan of the hoist by the hoist lifespan estimation device 72, the hoist can be replaced at an appropriate time, and the reduction of operating costs can be achieved.

[0050] As described above, the embodiments of the present invention have been described, but the present invention is not limited to the above embodiments. For example, in the above description, it has been described that the pulse signal output from the signal generation device 51 is applied between an arbitrary stator 60 and the ground, and the discharge level is measured using the antenna unit 521 disposed near the stator. In the case of measuring the insulation resistance between the stators 60 of the hoist 40, the pulse signal output from the signal generation device 51 may also be applied to one stator, and the other stator may be used as the antenna unit 521, and the voltage generated on the other stator may be measured as the discharge level.

[0051] In addition, in the use of Figure 9 it has been described that the measurement is performed by changing the voltage level applied to the stator 60, but the steps S34 and S35 of Figure 9 may also be omitted.

[0052] (Embodiment 2) In Embodiment 1, the following has been described: the operating condition evaluation unit 76 evaluates the operating condition of the hoist 40 by accumulating the value obtained by multiplying the temperature value measured by the temperature measurement device 53 by the duration of the temperature. In Embodiment 2, another method for evaluating the operating condition of the hoist 40 will be described.

[0053] The operating condition evaluation unit 76 of Embodiment 2 measures the current supplied to the stator 60 constituting the hoist 40, and evaluates the operating condition of the hoist 40 by accumulating the value obtained by multiplying the measured current value by the duration of the current. In Embodiment 2, Figure 8 the left vertical axis of the chart shown is the current, and the right vertical axis is the accumulated current. The current supplied to the hoist 40 is measured by the Figure 3 current measurement device 54 shown.

[0054] Since the greater the load applied to the hoist 40, the greater the current supplied to the hoist 40, the cumulative value of the current supplied to the hoist 40 becomes a parameter indicating the operating condition of the hoist 40. That is, the cumulative value of the current supplied to the hoist 40 can be said to be a parameter indicating the operating condition of the hoist 40 that takes into account parameters including the load of the passenger car 31 and the operating condition. However, the cumulative value of the current supplied to the hoist 40 does not reflect the temperature of the environment in which the hoist 40 is disposed.

[0055] The graph generation unit 77 generates a graph such that the greater the cumulative current value of the current supplied to the hoist 40 at the time of graph generation, the greater the degree of deterioration of the insulation characteristics of the future hoist 40. For example, when the cumulative current value of the hoist 40 is large, the graph generation unit 77 generates a graph in such a manner that the value of the future maximum value Pmax increases significantly, as shown by the curve A indicated by the center dash-dot line. In addition, when the cumulative current value of the hoist 40 is small, the graph generation unit 77 generates a graph in such a manner that the value of the future maximum value Pmax increases slightly, as shown by the curve B indicated by the center dashed line. Figure 10 As shown by the curve A indicated by the center dash-dot line. In addition, when the cumulative current value of the hoist 40 is small, Figure 10 As shown by the curve B indicated by the center dashed line, the graph is generated in such a manner that the value of the future maximum value Pmax increases slightly.

[0056] Although some embodiments of the present invention have been described, these embodiments are shown by way of example and are not intended to limit the scope of the present invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments or their modifications are included in the scope and gist of the invention and are included in the invention described in the claims and its equivalent scope.

Claims

1. A life estimation device for a winch, characterized in that: A test voltage is applied to a stator constituting a hoist, a discharge level discharged from the stator to which the test voltage is applied is measured, and a change in the degree of insulation degradation of the stator is estimated based on data representing a plurality of the discharge levels measured at predetermined intervals.

2. The life estimation device for a hoisting machine according to claim 1, characterized in that: have: a graph generating unit for generating a graph indicating a time transition of a future discharge level based on data indicating a plurality of discharge levels measured at predetermined intervals; as well as The life estimating unit estimates a date and time when the generated graph shows a value equal to or higher than a predetermined discharge level as a replacement time for the hoisting machine.

3. The life estimation device for a hoisting machine according to claim 2, characterized in that: have: a temperature measuring device that measures the temperature of a stator constituting the hoist; and an operating condition evaluation unit that evaluates the operating condition of the hoist by integrating a value obtained by multiplying the temperature value measured by the temperature measuring device by a duration of the temperature, The graph generating unit generates a graph indicating a time transition of a discharge level in consideration of the operating condition of the hoisting machine obtained by the operating condition evaluating unit.

4. The life estimation device for a hoisting machine according to claim 3, characterized in that: The operating condition evaluation unit evaluates the operating condition of the hoisting machine in consideration of parameters including a load, an operating condition, and a temperature of the passenger car.

5. The life estimation device for a hoisting machine according to claim 2, characterized in that: have: a current measuring device that measures a current supplied to a stator constituting the hoist; and an operating condition evaluation unit for evaluating the operating condition of the hoist by integrating a value obtained by multiplying the current value measured by the current measuring device by the duration of the current, The graph generating unit generates a graph indicating a time transition of a discharge level in consideration of the operating condition of the hoisting machine obtained by the operating condition evaluating unit.

6. A method for estimating the life of a winch, characterized in that: include: The process of applying a test voltage to the stator constituting the hoist; The step of measuring a discharge level discharged from the stator; as well as A life estimating step of estimating a transition of the degree of insulation degradation of a stator constituting the hoisting machine based on data indicating a plurality of the discharge levels measured at predetermined intervals.

7. The method for estimating the life of a winch according to claim 6, characterized in that: The life estimation process comprises: a graph generating step of generating a graph indicating a time transition of a discharge level based on data indicating a plurality of discharge levels measured at predetermined intervals; and The replacement time estimating step is to estimate the date and time when the generated graph shows a value equal to or higher than a predetermined discharge level as a replacement time of the hoisting machine.

8. The method for estimating the life of a winch according to claim 7, characterized in that: Further including: a temperature measuring step of measuring the temperature of a stator constituting the hoist; as well as an operating condition evaluation step of evaluating the operating condition of the hoist by integrating a value obtained by multiplying the temperature of the stator measured in the temperature measurement step by a duration of the temperature, The graph generating step includes a step of generating a graph indicating a time transition of a discharge level in consideration of the operating condition of the hoist obtained in the operating condition evaluating step.

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