Hoist life estimation device and hoist life estimation method

Abstract

To estimate the service life of a hoist.SOLUTION: A life estimation device for a hoist relating to an embodiment applies a test voltage to a stator constituting the hoist, and measures a discharge level from the stator to which the test voltage is applied to estimate the progression of an insulation deterioration level of the stator based on data indicating multiple discharge levels measured at a predetermined period.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] The lifespan of the motor that constitutes the hoisting machine of an elevator system is approximately 20 years, and maintenance of the hoisting machine is carried out in accordance with this lifespan.

[0003] However, the degree of deterioration of an elevator system's traction machine varies greatly depending on operating conditions such as the frequency of elevator use, the weight of passengers, and the temperature of the area where the elevator is installed. Therefore, the lifespan of a traction machine may be longer than the expected 20 years. On the other hand, if operating conditions are severe, the lifespan of a traction machine may be shorter than 20 years.

[0004] Maintenance of large equipment such as a traction machine requires extensive work, including installation, which means the elevator system is down for a long time. Since spare traction machines are rarely kept in stock, if a traction machine breaks down earlier than its expected lifespan, the elevator system will be down for a long time, including the time it takes to procure a new traction machine.

[0005] Breakdowns in hoists are often caused by deterioration of the insulation resistance of the stator of the motor that constitutes the hoist. Methods for inspecting the degree of deterioration of the insulation resistance of the motor stator have been disclosed, but no methods for estimating the lifespan of the hoist have been disclosed. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2023-162695 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in view of the above circumstances, and an object of the present invention is to estimate the life of a hoist. [Means for solving the problem]

[0008] A lifespan estimation device for a hoisting machine according to an embodiment for solving the above problem applies a test voltage to a stator constituting the hoisting machine, measures the discharge level discharged from the stator to which the test voltage has been applied, and estimates the progression of the degree of insulation deterioration of the stator based on data indicating multiple discharge levels measured over a predetermined period of time. The hoist life estimation device includes a temperature measurement device, an operating status evaluation unit, a graph creation unit, and a life estimation unit. The temperature measurement device measures the temperature of a stator that constitutes the hoist. The operating status evaluation unit evaluates the operating status of the hoist based on a cumulative temperature value obtained by multiplying the temperature value measured by the temperature measurement device by the duration of that temperature. The graph creation unit creates a graph showing the time progression of future discharge levels based on data indicating multiple discharge levels measured over a predetermined period of time and the operating status of the hoist determined by the operating status evaluation unit. The life estimation unit estimates the date and time when the created graph reaches a value equal to or greater than a predetermined discharge level as the replacement time for the hoist. The graph creation unit creates the graph so that the higher the cumulative temperature value, the greater the degree of deterioration of the insulation characteristics of the hoist in the future. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view of an elevator apparatus according to an embodiment of the present invention. [Figure 2] FIG. 2 is a block diagram showing a control system of the elevator apparatus according to the present embodiment. [Figure 3] 4A and 4B are diagrams for explaining measurement of insulation resistance of a stator that constitutes the traction machine according to the present embodiment. [Figure 4] FIG. 2 is a physical block diagram of a control unit according to the present embodiment. [Figure 5] FIG. 2 is a functional block diagram of a control unit according to the present embodiment. [Figure 6] 10 is a flowchart illustrating an operational status evaluation process according to the present embodiment. [Figure 7] FIG. 10 is a diagram for explaining an operational status evaluation process according to the present embodiment. [Figure 8] FIG. 10 is a diagram for explaining an operational status evaluation process according to the present embodiment. [Figure 9] 10 is a flowchart illustrating a lifespan estimation process according to the present embodiment. [Figure 10] 10A and 10B are diagrams for explaining a lifespan estimation process according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] This embodiment will be described below with reference to the drawings. In the description, an XYZ coordinate system consisting of mutually orthogonal X, Y, and Z axes will be used where appropriate. The drawings and flowcharts used to describe this embodiment are merely examples.

[0011] Fig. 1 is a perspective view of an elevator system 10 according to this embodiment. The elevator system 10 is disposed inside a hoistway 100 provided in a building such as a commercial facility or residential facility. As shown in Fig. 1, the elevator system 10 includes a car 31, a counterweight 45, a hoisting machine 40, guide rails 21 to 24, and a control panel 90 (elevator control device).

[0012] Each of the guide rails 21 to 24 is a member whose longitudinal direction is in the Z-axis direction. The guide rails 21 and 22 are a pair of members for guiding the car 31 so that it can move up and down freely. The guide rails 23 and 24 are a pair of members for guiding the counterweight 45 so that it can move up and down freely. The guide rails 21 and 22 are arranged spaced apart in the Y-axis direction. Similarly, the guide rails 23 and 24 are arranged spaced apart from each other in the Y-axis direction. In FIG. 1, the guide rails 23 and 24 of the counterweight 45 are arranged spaced apart in the X-axis direction from the guide rails 21 and 22 of the car 31. The arrangement of the guide rails 21 to 24 is not limited to the arrangement shown in FIG. 1.

[0013] The car 31 is a unit that accommodates passengers and moves them up and down the elevator shaft 100. The car 31 is disposed between the guide rails 21 and 22 and is attached to the guide rails 21 and 22 so as to be movable in the up and down direction.

[0014] An opening 31a for entering and exiting the interior is formed on the side surface on the +X side of the car 31. The opening 31a is closed or opened by a pair of doors 32 that move along the side surface of the car 31. The doors 32 are opened and closed by an opening / closing motor (not shown in FIG. 1).

[0015] The counterweight 45 is attached so as to be movable up and down relative to the guide rails 23 and 24. The weight of the counterweight 45 is adjusted to be a predetermined ratio to the weight of the car 31.

[0016] The hoist 40 is a motor for raising and lowering the car 31. The hoist 40 is disposed at the top of the hoistway 100 so that its rotation axis is parallel to the Y axis. A pulley 42 is fixed to the rotation axis of the hoist 40.

[0017] A wire 43 is wound around a pulley 42 of the hoisting machine 40. One end of the wire 43 is fixed to the car 31, and the other end is fixed to a counterweight 45.

[0018] The control panel 90 is disposed in the elevator shaft 100. The control panel 90 houses a control device for controlling the hoisting machine 40, the equipment provided in the car 31, and the like.

[0019] 2 is a block diagram showing a control system of the elevator apparatus 10. The control system includes a control unit 80 and a drive unit 91 housed in a control panel 90, and an operation panel 36 and a load sensor 39 provided in the car 31.

[0020] The operation panel 36 is provided on the inner wall surface of the car 31. The operation panel 36 is an interface for receiving destination floors and the like from users of the car 31. By operating the operation panel 36, users can register destination floors and the like for the car 31 and open and close the doors 32. The load sensor 39 is a device for measuring the load of the car 31. The above-mentioned operation panel 36 and load sensor 39 are connected to a control unit 80 housed in a control panel 90 via a cable 44 shown in FIG. 1.

[0021] 2 supplies power to the hoist 40 and the opening / closing motor 41 (not shown in FIG. 1) that drives the door 32 of the car 31, thereby driving the hoist 40 and the opening / closing motor 41. The drive unit 91 drives the hoist 40 based on instructions from the control unit 80. The drive unit 91 also drives the opening / closing motor 41 based on instructions from the control unit 80.

[0022] Here, a device for measuring the insulation resistance of the stator 60 constituting the hoisting machine 40 will be described. FIG. 3 is a diagram for explaining measurement of the insulation resistance of the stator 60 constituting the hoisting machine 40. For example, when the hoisting machine 40 is constituted by a three-phase motor, the number of stators 60 of the hoisting machine 40 is three or an even multiple of three. FIG. 3 shows one of the multiple stators 60 constituting the hoisting machine 40. A signal generator 51 and a measuring device 52 are used to measure the insulation resistance of the stator 60. Furthermore, the hoisting machine 40 is provided with a temperature measuring device 53 for measuring the temperature of the stator 60 constituting the hoisting machine 40 and a current measuring device 54 for measuring the current supplied to the hoisting machine 40. When measuring the insulation resistance of the stator 60 of the opening / closing motor 41, the opening / closing motor 41 is also provided with a signal generator 51, a measuring device 52, a temperature measuring device 53, and a current measuring device 54.

[0023] The signal generator 51 is a device for applying a test voltage to the stator 60. The test voltage is, for example, an impulse voltage. The signal generator 51 can change the output voltage level. FIG. 3 illustrates a case in which the test voltage is applied between one end 61 of the stator 60 and the ground, but the test voltage may also be applied between one end 61 and the other end 62 of the stator 60, or may be applied between multiple stators that make up the hoisting machine 40.

[0024] The measuring device 52 is a device for measuring the discharge level discharged from the stator 60. The measuring device 52 has an antenna unit 521 and a processing unit 522. The antenna unit 521 is placed near the stator 60, which is the measurement target, and receives the discharge level (electromagnetic waves) discharged from the stator 60. The processing unit 522 digitizes the discharge level received by the antenna unit 521 and notifies the control unit 80. The processing unit 522 is configured to include an A / D converter.

[0025] 4 is 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 memory 82, an auxiliary memory 83, and an interface 84, which are interconnected via a bus 85. The CPU 81 executes the processes described below in accordance with a program stored in the auxiliary memory 83. The main memory 82 includes RAM (Random Access Memory) and the like. The main memory 82 is used as a working area for the CPU 81. The auxiliary memory 83 includes non-volatile memory such as ROM (Read Only Memory) and semiconductor memory. The auxiliary memory 83 stores the programs executed by the CPU 81, various parameters, and the like.

[0026] The interface unit 84 has a serial interface, a parallel interface, a wireless LAN interface, etc. The operation panel 36, the load sensor 39, the signal generator 51, the measuring device 52, the temperature measuring device 53, the current measuring device 54, and the drive unit 91 are connected to the CPU 81 via the interface unit 84. In addition, the interface unit 84 is connected to an input / output device 93 consisting of a keyboard, a display, etc.

[0027] 5 is a functional block diagram of the control unit 80. The CPU 81 of the control unit 80 executes a program stored in the auxiliary storage unit 83 to implement the drive unit control unit 71 and the lifespan estimation device 72.

[0028] The drive unit control unit 71 controls the drive unit 91 based on input from the operation panel 36 or the call panel on each floor. For example, when the drive unit control unit 71 rotates the hoist 40 in the normal direction via the drive unit 91, the car 31 rises and the counterweight 45 descends. When the drive unit control unit 71 rotates the hoist 40 in the reverse direction via the drive unit 91, the car 31 descends and the counterweight 45 ascends. When the drive unit control unit 71 rotates the opening / closing motor 41 in the normal direction via the drive unit 91, the doors 32 of the car 31 and the doors provided at the landings on each floor are controlled to open, and when the opening / closing motor 41 is rotated in the reverse direction, the doors 32 of the car 31 and the doors provided at the landings on each floor are controlled to close.

[0029] The life estimation device 72 applies a test voltage to the stator 60 that constitutes the traction machine 40, measures the discharge level discharged from the stator 60 to which the test voltage has been applied, and estimates the transition of the degree of insulation deterioration of the stator 60 based on data indicating a plurality of discharge levels measured at predetermined intervals. The life estimation device 72 has an operating status evaluation unit 76, a graph creation unit 77, and a life estimation unit 78.

[0030] The operating status evaluation unit 76 evaluates the operating status of the hoisting machine 40 by accumulating the value obtained by multiplying the temperature value measured by the temperature measurement device 53 by the duration of that temperature. The operating status evaluation unit 76 evaluates the operating status of the hoisting machine 40 in consideration of parameters including the load of the car 31 measured by the load sensor 39, the operating status of the car 31 (such as the frequency of ascent and descent and the distance of ascent and descent), and the temperature. The load and operating status of the car 31 can also be evaluated by the current supplied to the hoisting machine 40 measured by the current measurement device 54, for example.

[0031] The graph creation unit 77 creates a graph showing the time transition of the discharge level in the future based on data showing a plurality of discharge levels measured at predetermined intervals. When creating the graph, the graph creation unit 77 creates the graph based on the data on the operating status of the hoisting machine 40 created by the operating status evaluation unit 76.

[0032] The life estimation unit 78 estimates the date and time when the graph created by the graph creation unit 77 reaches a value equal to or greater than a predetermined discharge level as the replacement time for the hoisting machine 40. Details will be described later.

[0033] Next, the operational status evaluation process performed by the operational status evaluation unit 76 will be described with reference to the flowchart shown in Fig. 6. The following control is performed based on a program stored in the auxiliary storage unit 83, and is mainly performed by the CPU 81 of the control unit 80.

[0034] The operation status evaluation unit 76 determines whether the car 31 of the elevator device 10 is in operation (step S11). "In operation" refers to a period during which the hoisting machine 40 is operating. If the car 31 is not in operation (step S11: No), the operation status evaluation unit 76 waits until the hoisting machine 40 starts operating. On the other hand, if it is determined that the car 31 is in operation (step S11: Yes), the operation status evaluation unit 76 measures the temperature of the stator 60 using the temperature measurement device 53 (step S12). Step S12 is a temperature measurement process. The load on the hoisting machine 40 correlates with the power consumed by the hoisting machine 40 depending on the load of the car 31 and the distance traveled by the car 31, and corresponds to the amount of heat generated by the hoisting machine 40.

[0035] Next, the operation status evaluation unit 76 evaluates the operation status of the hoisting machine 40 (step S13). Step S13 is an operation status evaluation process. Figure 7(a) shows the load on the hoisting machine 40. The vertical axis of Figure 7(a) is the load on the hoisting machine 40. The horizontal axis is time. The period when the load value is "0" is the period when the car 31 is not operating. The load on the hoisting machine 40 corresponds to the load of the car 31 measured by the load sensor 39. Figure 7(b) shows the operation time of the car 31. The high level period is the period when the car 31 is operating, and the low level period is the period when the car 31 is not operating. The operation status is evaluated based on the length of the period when the car 31 is operating, the length of the period when the car 31 is stopped, the operation frequency of the car 31, the weight of the car 31, etc. The amount of heat generated by the hoisting machine 40 is proportional to the load on the hoisting machine 40. Figure 7(c) shows an example of the temperature of the hoisting machine 40 measured by the temperature measuring device 53. As can be seen from Figures 7(a) to (c), the greater the load on the hoisting machine 40, the greater the temperature rise of the hoisting machine 40.

[0036] The operation status evaluation unit 76 calculates a value obtained by accumulating the temperature of the hoisting machine 40. Figure 8 shows a graph of the accumulated temperature of the hoisting machine 40. For simplicity, the explanation of the decrease in temperature of the hoisting machine 40 during periods when the car 31 is not operating and during periods when the car 31 is not operating will be omitted. The horizontal axis of Figure 8 represents time. The vertical axis on the left represents temperature. The bar graph shown in Figure 8 indicates that the hoisting machine 40 operated at temperature T1 for a period of time t1, and at temperature Ti for a period of time ti. This bar graph also includes the temperature during periods when the hoisting machine 40 was not operating. The temperature of the hoisting machine 40 is a value that reflects the temperature of the environment in which the hoisting machine 40 is located. The vertical axis on the right represents the accumulated temperature. The line graph shows the value obtained by accumulating the area of ​​the bar graph (accumulated temperature). The line graph is obtained by sequentially accumulating the area of ​​the bar graph for time period t1 by adding the area of ​​the bar graph for time period t2, then adding the area of ​​the bar graph for time period t3, and so on. The larger the cumulative temperature value shown in the line graph, the more frequently the hoisting machine 40 is operating. The greater the load on the hoisting machine 40, the greater the current supplied to the hoisting machine 40, and the greater the temperature rise of the hoisting machine 40. In other words, the cumulative temperature value obtained by accumulating the temperatures of the hoisting machine 40 can be said to be a parameter that indicates the operating status of the hoisting machine 40, taking into account parameters such as the load and operating status of the car 31. Therefore, the cumulative temperature value shown in the line graph correlates with the degree of deterioration of the hoisting machine 40 over time.

[0037] The operating status evaluation unit 76 continues to perform the processes from step S11 to step S13. This line graph is reset when the hoisting machine 40 is replaced. Therefore, the longer the operating time of the hoisting machine 40 (the time elapsed since replacement), the larger the value of the accumulated temperature indicated by the right end of the line graph. The life estimation device 72 stores the value of the accumulated temperature represented by a line graph such as that shown in FIG. 8 in the memory unit. In addition, the life estimation device 72 outputs a graph showing the accumulated temperature such as that shown in FIG. 8 to the input / output device 93.

[0038] Next, the lifespan estimation process performed by the lifespan estimation device 72 will be described with reference to the flowchart shown in Fig. 9. The operation status evaluation process by the operation status evaluation unit 76 is performed successively every time the car 31 is raised or lowered.

[0039] The life estimation device 72 determines whether a predetermined period of time has passed since the previous insulation characteristics test of the hoisting machine 40 was conducted (step S31). The predetermined period of time is, for example, one month or six months. If the predetermined period of time has passed (step S31: Yes), the process proceeds to step S32, where an insulation characteristics test of the hoisting machine 40 is conducted. Specifically, using the signal generator 51, a test voltage is applied to the stator 60 constituting the hoisting machine 40, for example, as shown in FIG. 3 (step S32). Then, the measurement device 52 measures the discharge level discharged from the stator 60 (step S33). The test voltage can be set to a plurality of voltage levels. For example, if the insulation rating of the hoisting machine 40 is 1000 V, the applied voltage level is set to 500 V, 750 V, 1000 V, etc. Because the measured values ​​of the discharge level vary widely, the life estimation device 72 measures the discharge level multiple times (for example, 10 times) and records the maximum measured value Pmax. It should be noted that the voltage applied to the hoisting machine 40 during normal lifting and lowering operation of the car 31 is, for example, 10% or 20% of the absolute rating of the hoisting machine 40.

[0040] Next, the life estimation device 72 determines whether or not the measurement of the insulation characteristics of the hoisting machine 40 has been completed at all predetermined test voltages (step S34). If the measurement of the insulation characteristics of the hoisting machine 40 has not been completed at all test voltages (step S34: No), the life estimation device 72 changes the voltage level of the test voltage output by the signal generating device 51 (step S35), and performs the processes of steps S32 and S33.

[0041] On the other hand, if the measurement of the insulation characteristics of the hoisting machine 40 has been completed at all test voltages (step S34: Yes), the life estimation device 72 determines whether the insulation characteristics test of the hoisting machine 40, measured at predetermined intervals, has been performed a predetermined number of times (step S36). The predetermined number is the number of times the insulation characteristics of the hoisting machine 40 have been measured, such as 10 or 20 times. If the insulation characteristics test of the hoisting machine 40 has not been performed the predetermined number of times (step S36: No), the life estimation device 72 returns the process to step S31. This is because the accuracy of the created graph will be low if there is little measurement data. Furthermore, if not much time has passed since the hoisting machine 40 started operating, the probability of insulation deterioration that would lead to insulation failure occurring in the stator 60 of the hoisting machine 40 is extremely low.

[0042] On the other hand, if the insulation characteristic test of the hoisting machine 40 has been performed the predetermined number of times (step S36: Yes), the life estimation device 72 proceeds to step S37. The graph creation unit 77 of the life estimation device 72 creates a graph showing the time transition of the future discharge level based on data showing a plurality of discharge levels measured at predetermined intervals (step S37). Step S37 is a graph creation step. For example, the graph creation unit 77 creates the graph by finding an approximation equation for a graph showing the insulation deterioration characteristic of the hoisting machine 40 using the least squares method or the like. The graph creation unit 77 creates a graph for each output voltage of the signal generator 51.

[0043] FIG. 10 is a diagram for explaining the process of creating a graph showing the insulation deterioration characteristics of the hoisting machine 40. FIG. 10 is a graph showing the maximum value Pmax measured by the measuring device 52 when a predetermined voltage (e.g., 500 V) is applied to the hoisting machine 40 by the signal generating device 51. The vertical axis of FIG. 10 is the maximum value Pmax of the discharge level discharged from the stator 60 measured by the measuring device 52. The horizontal axis is the operating time of the hoisting machine 40. Tab is the interval at which the insulation characteristics of the hoisting machine 40 are measured, such as one month or six months. The periods Tab do not necessarily have to be the same period. In FIG. 10, the maximum value Pmax of the discharge level measured for each period Tab is indicated by a circle. The graph creating unit 77 creates a graph showing the time progression of the maximum value Pmax of the discharge level based on the measurement values ​​indicated by the circles, using the least squares method or the like.

[0044] When creating the graph shown in Fig. 10, the graph creation unit 77 creates the graph taking into consideration the value of the accumulated temperature shown in Fig. 8 calculated by the operation status evaluation unit 76. Specifically, the graph creation unit 77 creates the graph so that the greater the value of the accumulated temperature of the hoisting machine 40 at the time of creating the graph, the greater the degree of deterioration of the insulation characteristics of the hoisting machine 40 in the future. For example, when the value of the accumulated temperature of the hoisting machine 40 is large, the graph creation unit 77 creates the graph so that the value of the maximum value Pmax in the future increases significantly, as shown in graph A indicated by the dashed line in Fig. 10. Furthermore, when the value of the accumulated temperature of the hoisting machine 40 is small, the graph creation unit 77 creates the graph so that the value of the maximum value Pmax in the future increases slightly, as shown in graph B indicated by the dotted line in Fig. 10.

[0045] Next, the life estimation unit 78 of the life estimation device 72 performs processing to estimate the replacement time of the hoisting machine 40 (step S38). Step S38 is a replacement time estimation step. Steps S37 and S38 are life estimation steps. Specifically, the life estimation unit 78 estimates the date and time when the graph created by the graph creation unit 77 reaches a value equal to or greater than a predetermined discharge level, which is a reference value, as the replacement time of the hoisting machine 40. As shown in FIG. 10 , the life estimation unit 78 estimates replacement time A, where graph A when the cumulative temperature value is large and the reference value intersect, to be earlier than replacement time B, where graph B when the cumulative temperature value is small and the reference value intersect. Note that the reference value is a different value for each output voltage of the signal generator 51.

[0046] The lifespan estimation device 72 outputs a graph as shown in FIG. 10 and the estimated replacement time of the hoisting machine 40 to the input / output device 93.

[0047] As described above, the hoist life estimation device 72 according to the first embodiment includes a graph creation unit 77 that creates a graph showing the time transition of future discharge levels based on data showing a plurality of discharge levels measured at predetermined intervals, and a life estimation unit 78 that estimates the date and time when the created graph reaches a value equal to or greater than a predetermined discharge level as the replacement time for the hoist 40. In this way, the hoist life estimation device 72 according to the first embodiment can estimate the life (replacement time) of the hoist 40.

[0048] Moreover, the hoist life estimation device 72 according to the first embodiment includes a temperature measurement device 53 that measures the temperature of the stator 60 that constitutes the hoist 40, and an operation status evaluation unit 76 that evaluates the operation status of the hoist 40 by accumulating a value obtained by multiplying the temperature value measured by the temperature measurement device 53 by the duration of that temperature. The graph creation unit 77 creates a graph showing the time transition of the discharge level, taking into account the operation status of the hoist 40 determined by the operation status evaluation unit 76. This allows the hoist life estimation device 72 according to the first embodiment to estimate the life (replacement time) of the hoist 40 with high accuracy.

[0049] By knowing the lifespan (replacement time) of the hoisting machine 40 in advance, a new hoisting machine can be procured before the hoisting machine 40 breaks down, thereby shortening the period required for maintenance of the elevator apparatus (the period during which the elevator apparatus cannot be used), including the time required to procure the hoisting machine. Furthermore, since maintenance can be performed before the hoisting machine 40 breaks down, the inconvenience to users can be reduced by setting the time for maintenance to be performed at night, for example.

[0050] The degree of deterioration of an elevator system's hoisting machine varies greatly depending on operating conditions such as the frequency of elevator use, the weight of passengers, and the temperature of the area where the elevator is installed. Therefore, the lifespan of a hoisting machine may be longer than expected. Replacing a hoisting machine that is only slightly deteriorated would result in excessive quality and increase operating costs. By estimating the lifespan of a hoisting machine using the hoisting machine lifespan estimation device 72, it is possible to replace the hoisting machine at the appropriate time, thereby reducing operating costs.

[0051] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. For example, the above description has been given of a case in which an impulse signal output by a signal generator 51 is applied between any one of the stators 60 and the ground, and the discharge level is measured using an antenna unit 521 disposed near the stator. When measuring the insulation resistance between the stators 60 of the traction machine 40, the impulse signal output by the signal generator 51 may be applied to one stator, and another stator may be used as an antenna unit 521, and the voltage generated in the other stator may be measured as the discharge level.

[0052] Furthermore, in the explanation using FIG. 9, the case where measurements are taken while changing the voltage level applied to the stator 60 has been explained, but steps S34 and S35 in FIG. 9 may be omitted.

[0053] (Embodiment 2) In the first embodiment, a case has been described in which the operational status evaluation unit 76 evaluates the operational status of the hoisting machine 40 by accumulating a value obtained by multiplying the temperature value measured by the temperature measuring device 53 by the duration of that temperature. In the second embodiment, another method for evaluating the operational status of the hoisting machine 40 will be described.

[0054] The operating status evaluation unit 76 according to the second embodiment measures the current supplied to the stator 60 that constitutes the hoisting machine 40, and evaluates the operating status of the hoisting machine 40 by accumulating the value obtained by multiplying the measured current value by the duration of that current. In the second embodiment, the vertical axis on the left side of the graph shown in Fig. 8 represents the current, and the vertical axis on the right side represents the accumulated current. The current supplied to the hoisting machine 40 is measured by the current measuring device 54 shown in Fig. 3.

[0055] The greater the load on the hoisting machine 40, the greater the current supplied to the hoisting machine 40, and so the cumulative value of the current supplied to the hoisting machine 40 is a parameter that indicates the operating status of the hoisting machine 40. In other words, the cumulative value of the current supplied to the hoisting machine 40 can be said to be a parameter that indicates the operating status of the hoisting machine 40, taking into account parameters including the load and operating status of the car 31. However, the cumulative value of the current supplied to the hoisting machine 40 does not reflect the temperature of the environment in which the hoisting machine 40 is placed.

[0056] The graph creation unit 77 creates a graph such that the greater the value of the cumulative current of the current supplied to the hoisting machine 40 at the time of creating the graph, the greater the degree of deterioration of the insulation characteristics of the hoisting machine 40 in the future. For example, when the value of the cumulative current of the hoisting machine 40 is large, the graph creation unit 77 creates a graph such that the value of the maximum value Pmax in the future increases significantly, as shown in graph A indicated by the dashed line in Fig. 10. Furthermore, when the value of the cumulative current of the hoisting machine 40 is small, the graph creation unit 77 creates a graph such that the value of the maximum value Pmax in the future increases slightly, as shown in graph B indicated by the dotted line in Fig. 10.

[0057] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments may be embodied in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as set forth in the claims. [Explanation of symbols]

[0058] 10...Elevator device 21~24...Guide rail 31...Car 31a...Opening 32...door 36...Operation panel 39...Load sensor 40...Hoisting machine (lifting motor) 41...Opening and closing motor 42...pulley 43...Wire 44…Cable 45...Counterweight 51...Signal generator 52...Measuring equipment 521...Antenna section 522...Processing section 53...Temperature measuring device 54...Current measuring device 60...Stator 61...One end of the stator 62...other end of stator 71...Drive unit control section 72…Life estimation device 76...Operational Status Evaluation Department 77...Graph Creation Section 78…Life estimation section 80...Control unit 81...CPU 82…Main memory section 83…Auxiliary storage unit 84...Interface section 85...Bus 90...Control panel 91...Drive unit 93... Input / output device 100...Elevator shaft

Claims

1. A life estimation device for a hoisting machine that applies a test voltage to a stator constituting a hoisting machine, measures a discharge level discharged from the stator to which the test voltage has been applied, and estimates a transition in the degree of insulation deterioration of the stator based on data indicating a plurality of the discharge levels measured at predetermined intervals, a temperature measuring device that measures the temperature of a stator that constitutes the hoisting machine; an operating status evaluation unit that evaluates the operating status of the hoisting machine based on an accumulated temperature value obtained by multiplying the temperature value measured by the temperature measuring device by the duration of that temperature; a graph creation unit that creates a graph showing a time transition of a future discharge level based on data indicating a plurality of discharge levels measured at predetermined periods and the operational status of the hoisting machine as determined by the operational status evaluation unit; and a lifespan estimation unit that estimates a date and time when the created graph shows a value equal to or greater than a predetermined discharge level as a replacement time for the hoisting machine; and The graph creation unit creates a graph such that the greater the value of the cumulative temperature, the greater the degree of deterioration of the insulation characteristics of the hoisting machine in the future. A device for estimating the lifespan of a hoist.

2. The operating status evaluation unit evaluates the operating status of the hoisting machine taking into account parameters including the load, operating status, and temperature of the car. The lifespan estimation device for a hoisting machine according to claim 1.

3. A life estimation device for a hoisting machine that applies a test voltage to a stator constituting a hoisting machine, measures a discharge level discharged from the stator to which the test voltage has been applied, and estimates a transition in the degree of insulation deterioration of the stator based on data indicating a plurality of the discharge levels measured at predetermined intervals, a current measuring device that measures a current supplied to a stator that constitutes the hoisting machine; an operating status evaluation unit that evaluates the operating status of the hoisting machine based on a cumulative value of a current obtained by multiplying the value of the current measured by the current measuring device by the duration of the current; a graph creation unit that creates a graph showing a time transition of a future discharge level based on data indicating a plurality of discharge levels measured at predetermined periods and the operational status of the hoisting machine as determined by the operational status evaluation unit; and a lifespan estimation unit that estimates a date and time when the created graph shows a value equal to or greater than a predetermined discharge level as a replacement time for the hoisting machine; and The graph creation unit creates a graph such that the greater the cumulative value of the current, the greater the degree of deterioration of the insulation characteristics of the hoisting machine in the future. A device for estimating the lifespan of a hoist.

4. measuring the temperature of a stator constituting the traction machine; an operating status evaluation step of evaluating the operating status of the hoisting machine based on an accumulated temperature value obtained by multiplying the temperature value measured in the temperature measurement step by the duration of that temperature; a measuring step of applying a test voltage to a stator constituting the hoisting machine and measuring a discharge level discharged from the stator; a graph creation process for creating a graph showing a time transition of the discharge level in the future based on data indicating a plurality of discharge levels measured at predetermined periods and the operational status of the hoisting machine determined by the operational status evaluation process; a lifespan estimation step of estimating a date and time when the created graph shows a value equal to or greater than a predetermined discharge level as a replacement time for the hoisting machine; Including, In the graph creation step, a graph is created such that the greater the value of the cumulative temperature, the greater the future insulation characteristics of the hoisting machine. Method for estimating the lifespan of a hoist.

5. a current measuring step of measuring a current supplied to a stator constituting the hoisting machine; an operating status evaluation step of evaluating the operating status of the hoisting machine based on a cumulative value of current obtained by multiplying the value of the current measured in the current measurement step by the duration of the current; a graph creation process for creating a graph showing a time transition of the discharge level in the future based on data indicating a plurality of discharge levels measured at predetermined periods and the operational status of the hoisting machine determined by the operational status evaluation process; a lifespan estimation step of estimating a date and time when the created graph shows a value equal to or greater than a predetermined discharge level as a replacement time for the hoisting machine; Including, In the graph creation step, a graph is created such that the greater the cumulative value of the current, the greater the future insulation characteristics of the hoisting machine. Method for estimating the lifespan of a hoist.

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