Elevator

Abstract

To provide an elevator capable of accurately detecting lateral vibration of a long rope.SOLUTION: The elevator 10 includes the laser range scanner 48 for measuring the lateral deflections of the long ropes 24A and 32A in the central portion of the hoistway 12, the position correcting portion 58 for calculating the corrected datum SD based on the measured datum D of the laser range scanner 48, and the deflection calculating portion 59 for calculating the lateral deflections of the long ropes 24A and 32A based on the corrected datum SD.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to elevators, and more particularly to rope sway of a long rope connected to a car. [Background technology]

[0002] In rope-type elevators installed in high-rise buildings, horizontal vibration (hereinafter referred to as "lateral vibration") can occur in long ropes such as the main rope and balancing rope due to shaking of the building caused by earthquakes, strong winds, etc. If the amplitude of this lateral vibration becomes large, the rope may come into contact with equipment installed in the elevator shaft, causing damage to the equipment. Therefore, it is desirable to raise and lower the car to a position where the amplitude of the rope does not become large (hereinafter referred to as the "non-resonance position") before the amplitude of the lateral vibration becomes large.

[0003] On the other hand, if the building is shaking significantly and the rope amplitude increases rapidly, and it is difficult to raise or lower the car to a non-resonant position before the rope amplitude becomes large, it is desirable to stop the car in order to minimize damage to equipment installed in the elevator shaft.

[0004] Patent Document 1 discloses an elevator that includes two cars, in which a detector installed on the ceiling of one of the cars detects the position of the main rope that suspends the other car, and based on the detected position of the main rope, detects abnormal shaking of the main rope and can perform controlled operation. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2016 / 151694 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the position where the long rope separates from the sheave or counterweight around which it is wound and the position where the long rope is connected to the car do not necessarily coincide in a plan view, and may be slightly different. As a result, the position of the long rope hanging down in the hoistway also changes slightly as the car rises and falls.

[0007] The configuration of Patent Document 1 does not take into consideration the fact that the position of the long rope changes depending on the elevation position of the car. As a result, the lateral vibration of the long rope cannot be detected with high accuracy, and there are cases where the lateral vibration detected as occurring in the long rope is greater than the actual magnitude of the lateral vibration.

[0008] An object of the present invention is to provide an elevator that can accurately detect lateral vibration of a long rope. [Means for solving the problem]

[0009] The elevator of the present invention is an elevator having the function of measuring the sway of a long rope connected to a passenger car, and is equipped with a rope position detection unit that measures the position of the long rope at a preset vertical position, a position correction unit that calculates correction data based on measurement data obtained via the rope position detection unit, and a sway calculation unit that calculates the sway of the long rope based on the correction data, and the correction data is calculated by removing frequency components below a preset frequency.

[0010] In the elevator of the present invention, the preset frequency may be set to a value smaller than the frequency of the vibration of the long rope when the car is located at the lowest floor landing.

[0011] The elevator of the present invention may include a rope swing monitoring unit that determines whether or not there is an abnormality based on the swing of the long rope calculated by the swing calculation unit and the position of the long rope detected by the rope position detection unit.

[0012] In the elevator of the present invention, the long rope may be at least one of the main rope and the balancing rope.

[0013] In the elevator of the present invention, the preset frequency may be set to a value smaller than the frequency of the swing of the long rope when the elevator car is located at the top floor landing. [Effects of the Invention]

[0014] According to the elevator of the present invention, by calculating the sway of the long rope using correction data from which frequency components below a preset frequency have been removed, it is possible to calculate the sway of the long rope after correcting the positional deviation of the long rope caused by the ascending or descending position of the car, thereby making it possible to measure the sway of the long rope with high accuracy. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of an elevator according to this embodiment. [Figure 2] FIG. 2 is a block diagram showing the relationship of a control system centered on a control device for detecting rope swing in the elevator of this embodiment. [Figure 3] Figure 3(a) is a diagram showing the arrangement of the main ropes and balancing ropes when the car shown in Figure 1 is stopped at the lowest floor landing, and Figure 3(b) is a diagram showing the arrangement of the main ropes and balancing ropes when the car shown in Figure 1 is stopped at the highest floor landing. [Figure 4] FIG. 4 is a diagram schematically showing the positional relationship between the car and the range sensor when measurement of the car-side balancing ropes is started via the range sensor shown in FIGS. 5(a) and 5(b). [Figure 5] Figures 5(a) and 5(b) are graphs showing the change in the vertical position of the car over time when the car starts to rise from a stopped state, and the change in the position of the car-side balancing rope measured via the range sensor. [Figure 6]FIG. 6 is a graph showing corrected data obtained by performing correction processing on the measurement data of the range measurement sensor shown in FIG. 5(b). [Figure 7] This figure shows the measurement target of the range sensor, which changes depending on the elevation position of the car. Figure 7(a) shows a state where the car is below the range sensor and the measurement target is the main rope part, and Figure 7(b) shows a state where the car is above the range sensor and the measurement target is the balancing rope part. DETAILED DESCRIPTION OF THE INVENTION

[0016] An elevator 10 according to one embodiment of the present invention will be described below with reference to the drawings. Note that the scales of the components in each drawing are not necessarily uniform. In each drawing, the horizontal direction perpendicular to the axial direction of the sheave 22 is indicated as horizontal direction X, the horizontal direction perpendicular to horizontal direction X is indicated as horizontal direction Y, and the vertical direction is indicated as vertical direction Z.

[0017] Figure 1 is a schematic diagram showing the overall configuration of an elevator 10. As shown in Figure 1, elevator 10 is a rope elevator that uses a traction system as its drive system, and a machine room 16 is provided in a part of building 14 above the top of hoistway 12. Elevator 10 is equipped with a hoisting machine 18 and a deflector sheave 20 in machine room 16, and a main rope 24 is wound around sheave 22 and deflector sheave 20 that make up hoisting machine 18, with a car 26 hanging from one end of main rope 24 and a counterweight 28 hanging from the other end.

[0018] In addition, between the bottom of the car 26 and the bottom of the counterweight 28, both ends of a counterweight rope 32 wound around a counterweight 30 installed in the pit (bottom) 12P of the elevator shaft 12 are connected.

[0019] In the elevator 10 having the above configuration, when the sheave 22 is rotated forward or backward by a hoisting machine motor (not shown), the main rope 24 wound around the sheave 22 runs, and the car 26 and counterweight 28 suspended by the main rope 24 rise and fall in opposite directions. In addition, the counter rope 32 suspended between the car 26 and counterweight 28 runs in a circular motion at the counterweight 30.

[0020] As shown in Fig. 1, a control device 50 that performs overall control of the operation of the elevator 10 is installed in the machine room 16. Here, Fig. 2 is a block diagram showing the relationship of a control system centered around the control device 50. As shown in Fig. 2, the control device 50 includes a memory unit 52 composed of a ROM, RAM, HDD, etc. in which various control programs are stored, and a CPU reads the programs from the memory unit 52 and performs arithmetic processing to function as an operation control unit 54 and a rope sway monitoring unit (rope sway monitoring unit) 56. The memory unit 52 also stores position information of hoistway equipment, such as a switchboard, that is installed in the hoistway 12.

[0021] The operation control unit 54 has a normal operation mode in which the car 26 is moved up and down based on call operations performed via a car operating panel (not shown) installed on the car 26 or a hall operating panel (not shown) installed at each floor hall by controlling the drive of the hoisting machine 18 and the like. The rope sway monitoring unit 56 has the role of monitoring horizontal sway that occurs in the main ropes 24 and the balancing ropes 32, and includes a position correction unit 58 and a sway calculation unit 59, which will be described later. In the following explanation, horizontal sway of the main ropes 24 and the balancing ropes 32 will be referred to as "lateral sway" where appropriate.

[0022] 1 and 2, elevator 10 is provided with a range sensor (rope position detection unit) 48 in hoistway 12, which transmits position information of long ropes 24, 32 to rope swing monitoring unit 56. This range sensor 48 is installed on the wall surface in the center of hoistway 12 in the vertical direction, at a position outside the ascending and descending path of car 26 and counterweight 28.

[0023] More specifically, the range sensor 48 is preferably installed in the center of the elevator shaft 12, that is, at a vertical position about half the total length AL of the elevator shaft 12 in the vertical direction from the pit 12P.

[0024] This range sensor 48 measures the direction and distance from the position of an object in the elevator shaft 12 that exists on a horizontal plane including its installation position, and outputs the measured direction and distance as two-dimensional position data. Here, the above horizontal plane will also be referred to as the "scanning plane" as appropriate.

[0025] The range sensor 48 is a known two-dimensional range sensor (laser range scanner) that emits laser light at predetermined angular intervals (e.g., 0.125 degrees) to scan the horizontal plane in a fan shape, measures the time it takes for each emitted laser light to travel to and from the object, and converts this time into distance, thereby measuring the distance from the installation position of the range sensor 48 to the object using a time-of-flight ranging method. The time per scan (scanning time) is, for example, 25 msec, and the number of scans per second is 40.

[0026] Here, Fig. 3(a) is a diagram showing the arrangement of the main ropes 24 and the counter ropes 32 in a stationary state, i.e., a non-vibrating state, when the car 26 is located at a landing on the lower floor. Fig. 3(b) is a diagram showing the arrangement of the main ropes 24 and the counter ropes 32 when the car 26 is located at a landing on the upper floor. As shown in Figs. 3(a) and 3(b), the portion of the main ropes 24 that suspends the car 26 will be referred to as the car-side main ropes 24A, and the portion that suspends the counter weight 28 will be referred to as the counter weight-side main ropes 24B.

[0027] In addition, the portion of the balancing rope 32 hanging down from the car 26 (the portion of the balancing rope 32 between the car 26 and the balancing wheel 30) will be referred to as the car-side balancing rope 32A, and the portion hanging down from the balancing weight 28 (the portion of the balancing rope 32 between the balancing weight 28 and the balancing wheel 30) will be referred to as the balancing weight-side balancing rope 32B.

[0028] According to the above definition, the length (range) of the car-side main rope 24A and the counterweight-side main rope 24B in the main rope 24, and the length (range) of the car-side counterweight rope 32A and the counterweight-side counterweight rope 32B in the counterweight rope 32, vary depending on the raised and lowered positions of the car 26 and the counterweight 28.

[0029] 3(a) and 3(b), when the car 26 is located below the range sensor 48, the car-side main rope 24A is the detection target. On the other hand, when the car 26 is located above the range sensor 48, the measurement target of the range sensor 48 may be the car-side balancing rope 32A.

[0030] As described above, in this embodiment, an example has been given in which the measurement target of the range sensor 48 is the car-side main rope 24A or the car-side balancing rope 32A, but the measurement target may also be at least one of the counterweight-side main rope 24B or the counterweight-side balancing rope 32. In this case, when the counterweight 28 is located below the range sensor 48, the measurement target of the range sensor 48 may be the counterweight-side main rope 24B, and when the counterweight 28 is located above the range sensor 48, the measurement target of the range sensor 48 may be the counterweight-side balancing rope 32B.

[0031] Furthermore, in a plan view, the position where the car-side main rope 24A stretched over the sheave 22 leaves the sheave 22 and the position where the car-side balancing rope 32A wound around the balancer 30 leaves the balancer 30 do not coincide with, and are slightly different from, the connection positions of the car-side main rope 24A and the car-side balancing rope 32A to the car 26. For this reason, as shown in Fig. 3(a), the stationary position P1 where the range sensor 48 detects the car-side main rope 24A when the car 26 is located at a lower landing does not coincide with the stationary position P2 where the range sensor 48 detects the car-side main rope 24A when the car 26 is located at an upper landing as shown in Fig. 3(b). In the following description, the difference in distance between the stationary positions P1 and P2 will be referred to as the offset distance F as appropriate.

[0032] If the rope sway (lateral sway) is calculated using the measurement values ​​of the car side main rope 24A obtained via the range sensor 48 without taking into account the above-mentioned offset distance F, the calculated sway amplitude may be larger than the actual rope sway.

[0033] Therefore, in this embodiment, the rope swing monitoring unit 56 has a role of correcting the offset distance F of the car-side main rope 24A using the position correction unit 58. More specifically, the position correction unit 58 has a function of outputting correction data SD based on the measurement data D obtained via the range sensor 48. This correction data SD is generated by removing, from the frequency components of the measurement data D, frequency components less than a preset frequency HP (for example, 0.1 Hz) and frequency components equal to or greater than a predetermined frequency LP (for example, 1.0 Hz).

[0034] As an example, the above-mentioned preset frequency HP may be set to a value smaller than the vibration frequency in the primary vibration mode (i.e., vibration with one antinode in lateral vibration) of the car side main rope 24A when the car 26 is stopped at the lowest floor landing, in other words, the resonant frequency fc, and more preferably a value equal to or smaller than 1 / 2 of the resonant frequency fc, and more preferably a value approximately 1 / 3 of the resonant frequency fc.

[0035] This makes it possible to remove frequency components lower than the primary vibration mode when the car-side main ropes 24A are longest, i.e., when the resonant frequency is lowest. As a result, regardless of the vertical position of the car 26, it is possible to remove low-frequency components without removing the resonant frequency components of the primary vibration mode of the car-side main ropes 24A.

[0036] Moreover, by removing frequency components less than the above-mentioned preset frequency HP, it is possible to remove the offset distance F. This makes it possible to accurately calculate the magnitude of the rope swing of the long ropes 24A, 32A.

[0037] In this embodiment, an example is given in which the preset frequency HP is set to a value smaller than the resonance frequency fc of the car-side main rope 24A in the primary vibration mode when the car 26 is stopped at the lowest floor landing, but the present invention is not limited to this. For example, the preset frequency HP may be set to a value smaller than the resonance frequency fc of the car-side balancing rope 32A in the primary vibration mode when the car 26 is stopped at the highest floor landing. Furthermore, the preset frequency HP may be set to a value smaller than the resonance frequency of the counterweight-side balancing rope 32B in the primary vibration mode when the car 26 is stopped at the lowest floor landing, or may be set to a value smaller than the resonance frequency of the counterweight-side main rope 24B in the primary vibration mode when the car 26 is stopped at the highest floor landing.

[0038] Moreover, the predetermined frequency LP may be set to a value that is approximately twice the resonant frequency fc when the car 26 is stopped at the lowest floor landing, for example. This makes it possible to remove unnecessary high-frequency noise contained in the measurement data D.

[0039] In this embodiment, the position correction unit 58 removes frequency components equal to or higher than a predetermined frequency LP from the measurement data D, but if there is little high-frequency noise, the frequency components equal to or higher than the predetermined frequency LP may not be removed.

[0040] 4 to 6, the correction data SD obtained from the measurement data D by the correction process in the position correction unit 58 described above will be described. Here, the measurement data D includes measurement data Dx in the horizontal direction X and measurement data Dy in the horizontal direction Y, but since the flow of the correction process for both data Dx and Dy is the same, the following explanation will only cover the correction process for the measurement data Dx.

[0041] Fig. 4 is a diagram showing an example of the position of the car 26 at the start of measurement of the measurement data D shown in Fig. 5(a) to Fig. 6. As shown in Fig. 4, the car 26 is located below the range sensor 48, and starts to rise from this position. Therefore, the measurement target of the range sensor 48 in this case is the car-side main rope 24A.

[0042] Figure 5(a) is a graph showing the change in the vertical position of the car 26 when the car 26 starts to rise from a stopped state. In Figure 5(a), the vertical axis shows the distance risen from the start of measurement, and the horizontal axis shows the elapsed time. As shown in Figure 5(a), the car is stopped from 0 seconds to around 26 seconds, and starts to rise around the time 26 seconds have passed.

[0043] FIG. 5(b) is a graph showing measurement data Dx included in the measurement data D measured via the range sensor 48 during the lifting and lowering operation of the car 26 shown in FIG. 5(a). This measurement data Dx is data showing a change in the position of the car-side main rope 24A in the horizontal direction X. In FIG. 5(b), displacement in the horizontal direction X toward the range sensor 48 is shown as positive, and displacement in the direction away from the range sensor 48 is shown as negative. As shown in FIG. 5(b), the car-side main rope 24A vibrates laterally with an amplitude of approximately 10 mm around a position of approximately -10 mm between 0 and 26 seconds while the car 26 is stopped. On the other hand, when the car 26 starts to rise, the center position of the vibration gradually approaches the range sensor 48, and it can be seen that the center position of the vibration is displaced to a position of approximately +10 to +20 mm.

[0044] 6 is a graph showing the correction data SDx in the horizontal direction X included in the correction data SD obtained by performing a correction process on the measurement data D via the position correction unit 58. As shown in FIG. 6, as a result of performing the correction process, it is possible to calculate the lateral runout in the horizontal direction X of the car-side main rope 24A from which the offset distance Fx (see FIG. 3(b)) has been removed. Here, the offset distance Fx is the component in the horizontal direction X included in the offset distance F.

[0045] According to the correction data SDx shown in Fig. 6, it can be seen that the lateral vibration of the car-side main rope 24A does not increase even 26 seconds after the car 26 starts to rise. In this way, by removing the offset distance F, it is possible to accurately measure the lateral vibration of the car-side main rope 24A.

[0046] 7 is a diagram showing the relationship between the amplitude Amea of ​​the car-side main rope 24A or the car-side balancing rope 32A (hereinafter, when there is no particular need to distinguish between them, they will be referred to as "long ropes 24A, 32A" as appropriate) and the maximum amplitude Amax calculated based on the amplitude Amea, based on the above-mentioned correction data SD, where FIG. 7(a) shows a case where the car 26 is positioned below the scanning plane of the range sensor 48, and FIG. 7(b) shows a case where the car 26 is positioned above the scanning plane of the range sensor 48. In the following description, the amplitude at any vertical position of the long ropes 24A, 32A will be referred to as amplitude A, the amplitude on the scanning plane of the long ropes 24A, 32A will be referred to as amplitude Amea, and the maximum amplitude of the long ropes 24A, 32A will be referred to as maximum amplitude Amax as appropriate.

[0047] 7(a) and 7(b), the rope swing monitoring unit 56 calculates the amplitude Amea of ​​the long ropes 24A, 32A based on the correction data SD. Here, since the amplitude Amea of ​​the long ropes 24A, 32A is the amplitude on the scanning plane of the range sensor 48, it is necessary to calculate the maximum amplitude Amax of the long ropes 24A, 32A in order to evaluate the magnitude of the lateral swing of the long ropes 24A, 32A.

[0048] Here, as shown in Figure 7(a), when the car 26 is below the scanning plane of the range sensor 48, the amplitude Amea of ​​the long rope is the amplitude of the swing of the car side main rope 24A on the scanning plane, the total length L is the length of the car side main rope 24A, and the distance Lz is the distance from the lower end of the car side main rope 24A to the scanning plane of the range sensor 48.

[0049] On the other hand, as shown in Figure 7(b), when the car 26 is above the scanning plane of the range sensor 48, the amplitude Amea of ​​the long rope is the amplitude of the swing of the car-side balancing rope 32A on the scanning plane, the total length L is the length of the car-side balancing rope 32A, and the distance Lz is the distance from the lower end of the car-side balancing rope 32A to the scanning plane of the range sensor 48.

[0050] The swing calculation unit 59 (see FIG. 2) has a function of calculating the maximum amplitude Amax of the long ropes 24A, 32A based on the amplitude Amea described above. As an example, the swing calculation unit 59 may calculate the amplitude A and the maximum amplitude Amax of the long ropes 24A, 32A by inputting the amplitude Amea, the total length L, and the distance Lz of the long ropes 24A, 32A into a mathematical formula that shows an approximation curve that approximates the vibration waveform of the long ropes 24A, 32A.

[0051] Furthermore, the rope swing monitoring unit 56 determines whether or not there is an abnormality using the calculation result of the swing calculation unit 59 and the measurement data D. More specifically, the rope swing monitoring unit 56 determines whether or not there is an abnormality, for example, when the maximum amplitude Amax is equal to or greater than the allowable value, or when the distance between the positions of the long ropes 24A, 32A and the positions of the equipment in the elevator shaft stored in the memory unit 52 is close to each other.

[0052] This makes it possible to determine whether an abnormality has occurred when the lateral vibration of the long ropes 24A, 32A is large or when there is a possibility that the lateral vibration will cause the long ropes 24A, 32A to come into contact with equipment in the elevator shaft.

[0053] When an abnormality is determined via the rope swing monitoring unit 56, the operation control unit 54 switches the operation mode of the car 26 from the normal operation mode to the controlled operation mode. Here, the controlled operation mode is, for example, an operation mode in which the car 26 is stopped at the nearest floor landing to let passengers off, and then the car 26 is moved up and down to a non-resonance floor, i.e., a landing of a floor where the long ropes 24A, 32A do not resonate. This suppresses lateral swing of the long ropes 24A, 32A and prevents the long ropes 24A, 32A from contacting the equipment in the hoistway.

[0054] In addition, instead of the controlled operation mode, the operation control unit 54 may execute an operation suspension mode in which the car 26 is stopped at the nearest floor landing, passengers are allowed to disembark, and the car 26 is stopped at the nearest floor landing.

[0055] According to the elevator 10 of this embodiment, by calculating the vibration of the long ropes 24A, 32A using the correction data SD from which frequency components below a preset frequency HP have been removed, it is possible to calculate the lateral vibration of the long ropes 24A, 32A after correcting the positional deviation of the long ropes 24A, 32A on the scanning plane caused by the vertical (ascending / descending) position of the car 26. This makes it possible to measure the lateral vibration of the long ropes 24A, 32A with high accuracy.

[0056] In the above embodiment, the range sensor 48 is provided at a position approximately 1 / 2 of the total length AL of the hoistway 12 from the pit 12P of the hoistway 12, but the range sensor 48 does not necessarily have to be provided at a vertical position approximately 1 / 2 of the total length AL, and may be provided at a position closer to the pit 12P or a position closer to the machine room 16 of the hoistway 12. Furthermore, in addition to providing the range sensor 48 in the center of the hoistway 12 as in the above embodiment, a range sensor having the same function and configuration as the range sensor 48 may also be provided at at least one of a vertical position approximately 1 / 4 of the total length AL from the pit 12P and a vertical position approximately 3 / 4 of the total length AL from the pit 12P. In this case, the rope sway monitoring unit 56 can determine an abnormality based on the magnitude of lateral sway of the long ropes 24, 32 and the positions of the long ropes 24, 32 at different vertical positions.

[0057] In the above embodiment, the elevator 10 is described as having one main rope 24A, but the present invention is not limited to this. For example, the present invention can be applied to a case where the elevator 10 has multiple main ropes. In this case, the position correction unit 58 may calculate the correction data SD based on the average value of the position data of the multiple main ropes included in the measurement data D obtained via the range sensor 48 (in other words, the center position calculated from the position data of each main rope).

[0058] Furthermore, in the above embodiment, the elevator 10 has been described as having one compensating rope 32, but the present invention is not limited to this. For example, the elevator 10 may have multiple compensating ropes. In this case, the position correction unit 58 may calculate the correction data SD based on the average value of the position data of the multiple compensating ropes included in the measurement data D obtained via the range sensor 48 (in other words, the center position calculated from the position data of each compensating rope). In these cases, the same effects as those of the above embodiment can be obtained.

[0059] In the above embodiment, the case where the long rope to be measured by the range sensor 48 is the main rope 24 or the counter rope 32 has been described as an example, but the present invention is not limited to this. For example, the measurement target of the range sensor 48 may be a governor rope (governor rope).

[0060] The present invention can be implemented in various forms, including improvements, modifications, and variations based on the knowledge of those skilled in the art, without departing from the spirit of the invention. Furthermore, the invention can be implemented in a form in which any of the features of the invention are replaced with other technology, as long as the same action or effect is achieved. [Explanation of symbols]

[0061] 10 Elevator 12 Elevator shaft 24 Main Rope 24A Cage side main rope (long rope) 24B Main rope on counterweight side (long rope) 26 Car 32 Balancing rope 32A Cage side balancing rope (long rope) 32B Counterweight side balancing rope (long rope) 48 Range sensor (rope position detection unit) 50 Control device 52 Storage section 54 Operation control unit 56 Rope swing monitoring unit (rope swing monitoring section) 58 Position correction section 59 Runout calculation unit

Claims

1. An elevator having a function of measuring the swing of a long rope connected to a car, a rope position detection unit for measuring the position of the long rope at a preset vertical position; a position correction unit that calculates correction data based on measurement data obtained via the rope position detection unit; a swing calculation unit that calculates the swing of the long rope based on the correction data; Equipped with The correction data is calculated by removing frequency components below a predetermined frequency. Elevator.

2. The preset frequency is set to a value smaller than the frequency of the swing of the long rope when the elevator car is located at the lowest floor landing.

2. The elevator of claim 1.

3. A rope swing monitoring unit that determines whether or not there is an abnormality based on the swing of the long rope calculated by the swing calculation unit and the position of the long rope detected by the rope position detection unit, 2. The elevator of claim 1.

4. The long rope is at least one of a main rope and a balancing rope.

2. The elevator of claim 1.

5. The preset frequency is set to a value smaller than the frequency of the swing of the long rope when the elevator car is located at the top floor landing.

2. The elevator of claim 1.

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