JP2011190096A - Elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately determine the necessity to repair when a guide rail is distorted or shifted. <P>SOLUTION: After a car 2 reaches the lowermost floor by earthquake supervision operation by detection of an earthquake, an elevator control panel 7 operates the car 2 from the lowermost floor to the uppermost floor at a speed lower than in the normal operation. The elevator control panel 7 acquires an electric current value flowing through an electromagnetic coil of four non-contact guide devices 11 detected by a control device 12 for the non-contact guide device during the operation. The elevator control panel 7 determines that the guide rail 8 is distorted or shifted and the repair of the guide rail 8 is required in order to restart the normal operation when the electric current value flowing in the electromagnet coil of any of the four non-contact guide devices 11 exceeds the prescribed value. When the car 2 reaches the uppermost floor, the elevator control panel 7 outputs a determination result of the necessity to the repair of the guide rail 8 as maintenance information to a remote monitoring center. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an elevator that guides a car in a non-contact state with respect to a guide rail.

  A conventional elevator is configured such that a car suspended from a rope moves up and down along a pair of guide rails installed vertically in a hoistway. A rotational moment acts on the car due to an imbalance of the load in the car, etc., but the car is supported by a guide device attached to the car by a guide rail.

  Conventionally, as a guide device for a car, a rotation support type roller guide, a sliding guide shoe that slides on a guide rail, and the like have been used. In such a contact-type guide device, vibration and noise caused by guide rail joints and deflection are transmitted to the car via the guide device wheels and sliding parts, which is one of the factors that impair the riding comfort of the elevator. It was one.

  In recent years, in order to avoid such a problem, for example, as disclosed in Patent Document 1, a guide device constituted by an electromagnet is mounted on a car and a magnetic force is applied to an iron guide rail. There is a way to guide the car without contact.

  This is because the electromagnets placed at the four corners of the car energize the magnet with the guide rail surrounded from three directions, thereby controlling the magnetic force between the guide rail and the guide device. On the other hand, it is possible to guide in a non-contact manner.

Japanese Patent Laid-Open No. 2005-60001

  In order to provide safe and stable guidance of the car by the non-contact guide device described above, the guide rail needs to have a longitudinal direction parallel to the ascending / descending direction of the car. As a result, a part of the guide rail may be distorted. In addition, when the guide rail is configured by tightening multiple parts with a tightening member, the tightening part of the joint of the guide rail is loosened due to the occurrence of an earthquake, etc., and the longitudinal direction of a part of the guide rail is May deviate from the direction parallel to the up-and-down direction. In this way, when the guide rail is distorted or displaced, and the degree of the distorted or displaced becomes large, it becomes impossible to perform safe and stable guidance of the car.

  In guiding the car by the non-contact guide device described above, it is possible to determine whether guide rail repair is necessary by detecting the occurrence of distortion or deviation of the guide rail based on changes in the hoisting machine torque. It is done. However, the hoisting machine torque may change due to causes other than the occurrence of distortion and deviation of the guide rail. Further, when the distortion of the guide rail is a distortion in the direction closer to the vertical direction with respect to the elevator car's lifting / lowering direction, the torque of the hoisting machine does not change. For these reasons, it has been difficult to accurately determine whether or not the guide rail needs to be repaired by detecting distortion or deviation of the guide rail based on the change in the torque of the hoisting machine.

  Accordingly, an object of the present invention is to provide an elevator that can accurately determine whether or not a repair is necessary when a guide rail is distorted or displaced.

  That is, an elevator according to the present invention is mounted on a guide rail laid vertically in a hoistway, a car that moves up and down along the guide rail, and the car, An opposing electromagnet; a magnet unit that is arranged to share a magnetic path with the electromagnet in the gap and that supplies a magnetomotive force necessary to guide the car; and the electromagnet includes the magnet A sensor unit for detecting a state of the magnetic circuit formed with the air gap and the guide rail in the air gap, and a guide control means for controlling the excitation current of the electromagnet based on the output of the sensor unit to stabilize the magnetic circuit; Current detecting means for detecting the excitation current value of the electromagnet, and the longitudinal direction of the guide rail is parallel to the raising / lowering direction of the car A travel propriety judging means for judging whether or not the guide rail needs to be repaired due to the situation, and an output means for outputting a judgment result by the travel propriety judging means. It is characterized by that.

  According to the present invention, it is possible to accurately determine whether or not the repair is necessary when the guide rail is distorted or displaced.

The figure which shows the structural example of the elevator in embodiment of this invention. The perspective view which shows the structure of the non-contact guide apparatus in embodiment of this invention. The figure which shows the positional relationship of the non-contact guide apparatus and guide rail of the elevator in embodiment of this invention. The block diagram which shows the structural example of the control apparatus for elevator non-contact guide apparatuses in embodiment of this invention. The block diagram which shows the structural example of the elevator control panel of the elevator in embodiment of this invention. The flowchart which shows an example of the judgment process of the necessity of repair of the guide rail of the elevator in embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram illustrating a configuration example of an elevator according to an embodiment of the present invention.
The elevator includes a hoist 1, a car 2, a main rope 3, a suspension weight (C / W) 4, a pulse generator 5, a deflector sheave 6, an elevator control panel 7, a guide rail 8, a tail cord 9, and a hoistway 10 , A non-contact guide device 11, a non-contact guide device controller 12, and a load sensor 13.

  The hoisting machine 1 is provided in the machine room of this elevator. The car 2 is connected to a suspension weight 4 through a main rope 3 wound around a sheave provided on the rotating shaft of the hoisting machine 1 and a baffle sheave 6. As the sheave is driven by the hoisting machine 1, the car 2 moves up and down in the hoistway 10 together with the suspension weight 4 by the frictional force between the sheave and the main rope 3.

  The elevator control panel 7 is provided in the machine room and controls the operation of the car 2. The load sensor 13 is composed of a differential transformer, a gap sensor, and the like, is installed at the lower part of the car 2, and outputs a voltage signal for calculating a load signal to the elevator control panel 7 via the tail cord 9. The non-contact guide control device 12 is installed on the upper part of the car 2 and connected to the elevator control panel 7 via the tail cord 9.

The pulse generator 5 is installed on the rotation shaft of the hoisting machine 1, detects the shaft rotation of the hoisting machine 1, and generates a number of pulse signals proportional to the rotation angle.
The elevator control panel 7 can detect the car position based on the accumulated count number of pulse signals and a predetermined number of pulses corresponding to the destination floor.

  The guide rails 8 are made of iron and are a pair of T-shaped guide rails laid in the vertical direction in the hoistway 10. Further, the non-contact guide device 11 is attached to four places on the upper, lower, left and right sides of the car 2. The car 2 is suspended by the main rope 3 and guided to the guide rail 8 in the hoistway 10 via the non-contact guide device 11, and moves up and down in the hoistway 10.

FIG. 2 is a perspective view showing the configuration of the non-contact guide apparatus in the embodiment of the present invention.
As shown in FIG. 2, the non-contact guide device 11 includes a magnet unit 11a and a base 11b that supports the magnet unit 11a.
The non-contact guide device 11 includes a gap sensor 14 that detects a distance between the magnet unit 11 a and the guide rail 8, a permanent magnet 15, and an electromagnet 16. By controlling the non-contact guide device 11, the magnetic force of the electromagnet 16 of each non-contact guide device 11 acts on the guide rail 8, and the distance between the guide rail 8 and the magnet unit 11 a of each non-contact guide device 11 is constant. The car 2 is guided in a non-contact manner so as to keep the above intervals.
The permanent magnet 15 is disposed so as to share a magnetic path with the electromagnet 16 in the gap between the guide rail 8 and the electromagnet 16, and supplies a magnetomotive force necessary for guiding the car 2.
The gap sensor 14 is an eddy current type displacement sensor and the detection principle is not particularly limited, but detects the distance between the gap sensor 14 of the non-contact guide device 11 and the guide rail 8.

  The non-contact guide device controller 12 calculates the current required for stable guidance of the car 2 based on the detection result of the gap sensor 14. The non-contact guide device 11 applies the calculated current to the coil of the electromagnet 16 and controls the excitation current of the coil of the electromagnet 16 to obtain stable guidance of the car 2.

FIG. 3 is a diagram showing a positional relationship between the elevator non-contact guide device and the guide rail in the embodiment of the present invention.
As shown in FIG. 3, the magnet unit 11a is formed by assembling E-shaped permanent magnets 15a and 15b and electromagnets 16a, 16b and 16c. Moreover, as shown in FIG. 3, the gap sensor 14 of the non-contact guide apparatus 11 consists of gap sensors 14a and 14b. Hereinafter, the gap sensors 14a and 14b are referred to as the above-described gap sensor 14, the permanent magnets 15a and 15b are referred to as the above-described permanent magnet 15, and the electromagnets 16a, 16b, and 16c are referred to as the above-described electromagnet 16 as necessary.

  Moreover, as shown in FIG. 3, the guide rail 8 is perpendicular to the inside of the hoistway 10 along the longitudinal direction of the car door from the center of the parallel part and the parallel part parallel to the left-right direction of the car door. And a protruding portion that extends.

The longitudinal direction of the electromagnets 16a, 16b, 16c is a direction along the vertical direction of the car door. The central portion of the electromagnet 16 a has a protrusion that faces the wall surface of the hoistway 10.
The permanent magnet 15a is attached so that one end thereof is attached to one end of the electromagnet 16a, the other end faces the wall surface of the hoistway 10, and the longitudinal direction is perpendicular to the longitudinal direction of the electromagnet 16a.
The permanent magnet 15b is attached so that one end thereof is attached to the other end of the electromagnet 16a, the other end faces the wall surface of the hoistway 10, and the longitudinal direction is parallel to the longitudinal direction of the permanent magnet 15a.

One end of the electromagnet 16 b is attached to the other end of the permanent magnet 15 a, the longitudinal direction is perpendicular to the longitudinal direction of the permanent magnet 15 a, the other end is parallel to the longitudinal direction of the electromagnet 16 a, and the other end is the guide rail 8. It is attached to face the protrusion.
One end of the electromagnet 16c is attached to the other end of the permanent magnet 15b, the longitudinal direction is perpendicular to the longitudinal direction of the permanent magnet 15b, parallel to the longitudinal direction of the electromagnet 16a, and the other end of the electrorail 16c. It is attached to face the protrusion.

  These electromagnets 16a, 16b and 16c are obtained by winding a coil around an iron core. Specifically, the first coil of the electromagnet 16a is wound around the portion of the electromagnet 16a attached to the permanent magnet 15a, and the second portion of the electromagnet 16b is attached to the electromagnet 16a near the portion attached to the permanent magnet 15b. Coil is wound. Further, the coil of the electromagnet 16b is wound around the portion of the electromagnet 16b facing the first coil of the electromagnet 16a, and the coil of the electromagnet 16c is wound around the portion of the electromagnet 16c facing the second coil of the electromagnet 16a. Wrapped.

A gap sensor 14a for detecting a gap in the left-right direction of the car door between the electromagnet 16a and the protrusion of the guide rail 8 is attached to the tip of the protrusion of the electromagnet 16a. The gap sensor 14a faces the tip portion of the protrusion of the guide rail 8.
A gap sensor 14b is attached to the other end of the electromagnet 16b to detect a gap in the front-rear direction of the car door between the electromagnet 16b and the protrusion of the guide rail 8. This gap sensor 14 b is close to the protrusion of the guide rail 8.

  The non-contact guide device control device 12 controls the current applied to each coil of the electromagnet 16 of the non-contact guide device 11 so that the electromagnet 16b and the electromagnet 16c face the guide rail 8; And a suction force is made to act in the direction orthogonal to this direction.

FIG. 4 is a block diagram illustrating a configuration example of a control device for an elevator non-contact guide device according to an embodiment of the present invention.
As illustrated in FIG. 4, the non-contact guide device control device 12 includes a current detector 21, a calculator 22, and a power supply unit 23.
The current detector 21 detects a current value flowing through the coil of the electromagnet 16 of the non-contact guide device 11. Specifically, the current detector 21 converts the current to be detected into a voltage signal, and detects this voltage signal as a current value flowing through the coil of the electromagnet 16.

  The calculator 22 calculates the current applied to the coil of the electromagnet 16 to guide the car 2 in a non-contact manner based on signals from the current detector 21 and the gap sensor 14. The power supply unit 23 supplies power to the coil of the electromagnet 16 based on the calculation result of the calculator 22. The non-contact guide device controller 12 controls the attractive forces of the magnet units 11 a installed at the four corners of the car 2 by the supply of this electric power.

  Here, the non-contact guide device control device 12 converges the currents of the coils of the electromagnets 16a, 16b, and 16c to zero, so that the permanent magnet is permanent regardless of the weight of the car 2 and the magnitude of the unbalanced force. So-called zero power control is performed in which the car 2 is stably supported only by the attractive force of the magnet 15.

  By configuring the magnetic guide system by zero power control, the car 2 is stably supported in a non-contact manner with respect to the guide rail 8, and when it is in a steady state, the current flowing through the coil of the electromagnet 16 converges to zero. The force necessary for stable support of the car 2 is all covered by the magnetic force generated by the permanent magnet 15.

  This is the same even when the load or balance of the car 2 changes. That is, when some external force is applied to the car 2, a current is transiently applied to the coil of the electromagnet 16 in order to make the gap between the non-contact guide device 11 and the guide rail 8 a predetermined size. Will flow. When the stable state is obtained again, the current flowing through the coil of the electromagnet 16 converges to zero by using the above-described zero power control. In this case, the load applied to the car 2 and the permanent magnet 15 A gap having a size that balances the attractive force generated by the magnetic force is formed.

FIG. 5 is a block diagram illustrating a configuration example of the elevator control panel of the elevator according to the embodiment of the present invention.
As shown in FIG. 5, the elevator control panel 7 includes a load detection unit 31, an operation control unit 32, a pulse value detection unit 33, an earthquake detection unit 34, a detection result acquisition unit 35, a travel availability determination unit 36, and a determination result output unit. 37 and a storage device 38.
The load detection unit 31 detects the load value of the car 2 based on the signal from the load sensor 13.
The operation control unit 32 controls the operation of the car 2. Specifically, the operation control unit 32 performs normal operation according to call registration, performs seismic control operation for landing the car 2 on the nearest floor in the event of an earthquake, and guides the guide after landing on the nearest floor. For the purpose of determining whether or not the rail 8 needs to be repaired, an operation is performed in which the car 2 runs from the lowermost floor to the uppermost floor at a lower speed than during normal operation.

The pulse value detector 33 detects the car position of the car 2 by integrating and counting the pulse signals from the pulse generator 5.
The earthquake detector 34 detects an earthquake in the building where the elevator is installed.
The detection result acquisition unit 35 acquires a current value of the coil of the electromagnet 16 that is a detection result of the current detector 21 of the non-contact guide device controller 12.

The travel possibility determination unit 36 determines whether or not the guide rail 8 needs to be repaired due to the fact that the longitudinal direction of the guide rail 8 is not parallel to the raising / lowering direction of the car 2. Judge based on size.
The determination result output unit 37 outputs the determination result by the travel propriety determination unit 36 to a remote monitoring center (not shown).
The storage device 38 is a storage medium such as a nonvolatile memory, and includes a load detection unit 31, an operation control unit 32, a pulse value detection unit 33, an earthquake detection unit 34, a detection result acquisition unit 35, a travel availability determination unit 36, and a determination result. A control program for processing operation by the output unit 37 is stored.

Next, the operation for determining whether or not the guide rail 8 needs to be repaired due to the distortion or deviation of the guide rail 8 of the elevator having the configuration described so far will be described. FIG. 6 is a flowchart illustrating an example of determination processing for determining whether or not the guide rail of the elevator is repaired according to the embodiment of the present invention.
In the initial state, it is assumed that normal operation is performed by the operation control unit 32 of the elevator control panel 7. In this state, when the earthquake detection unit 34 of the elevator control panel 7 detects an earthquake of a predetermined magnitude or larger in the building where the elevator is installed (step S1), the operation control unit 32 performs the earthquake control operation. It starts (step S2), and the car 2 is landed at the nearest floor (step S3).

Then, the load value of the car 2 is detected by the load detector 31 based on the signal from the load sensor 13 (step S4).
When the elevator control panel 7 detects that no passenger is present in the car 2 as a result of detecting the load value of the car 2 (YES in step S5), the operation control unit 32 moves the car 2 to the bottom. Drive to the floor (step S6).

  Then, the operation control unit 32 starts driving the car 2 from the lowermost floor to the uppermost floor at a lower speed than that during normal operation for the purpose of determining whether or not the guide rail 8 needs to be repaired (step) S7).

  During this operation, as in the normal operation, current control for non-contact guidance of the car 2 by the current detector 21, the arithmetic unit 22, and the power supply unit 23 of the control device 12 for non-contact guidance device. Is made. The detection result acquisition unit 35 of the elevator control panel 7 acquires the current values flowing through the coils of the electromagnets 16 of the four non-contact guide devices 11, which are detection results by the current detector 21 of the non-contact guide device control device 12. (Step S8). Further, at the same timing as this acquisition, the pulse value detector 33 detects the car position of the car 2 based on the pulse signal from the pulse generator 5 (step S9).

  When the guide rail 8 is not distorted or displaced, or even when distorted or displaced, the extent is slight, the fluctuation range of the gap between the magnet unit 11a and the guide rail 8 is constant. Within the range. In this case, the value of the current flowing in the coil of the electromagnet 16 of any one of the four non-contact guide devices 11 by the current control by the non-contact guide device control device 12 during traveling of the car 2 is within a certain value. It will fit.

  On the other hand, when the guide rail 8 is greatly distorted or displaced, the distance between the magnet unit 11a and the guide rail 8 changes significantly compared to the case where no distortion or displacement is generated. In this case, as a result of the current control by the non-contact guide device controller 12, the value of the current flowing in the coil of the electromagnet 16 of any one of the four non-contact guide devices 11 greatly increases and exceeds the above-described fixed value. It will be a thing.

  As a specific example, when the longitudinal direction of the left and right guide rails 8 of the car 2 is shifted asymmetrically with respect to the ascending / descending direction of the car 2, the magnet unit 11a of the non-contact guide device 11 and the guide rail 8 The current value flowing in the coil of the electromagnet 16 of any of the four non-contact guide devices 11 is increased by the current control by the non-contact guide device control device 12 so that the interval is constant. Further, when the longitudinal direction of the left and right guide rails 8 deviates in the same direction with respect to the raising / lowering direction of the car 2, the four non-contacts when traveling in the range where the deviation occurs. When the value of the current flowing through the coil of the electromagnet 16 of any of the guide devices 11 greatly increases and exceeds the above-described fixed value, and the car 2 is traveling in a range where there is a deviation. Becomes constant when the current value exceeds the above-described constant value.

  The travel propriety determination unit 36 acquires the value of the current flowing in the coil of the electromagnet 16 of any of the four non-contact guide devices 11 acquired by the detection result acquisition unit 35 exceeding a predetermined value stored in the storage device 38. (YES in step S10), the guide rail 8 is distorted or displaced, and the car 2 cannot be safely and stably guided without contact, and the guide rail 8 is repaired to resume normal operation. Is determined to be necessary (step S11).

  In addition, when the current value flowing through the coils of the electromagnets 16 of the four non-contact guide devices 11 acquired by the detection result acquisition unit 35 does not exceed a predetermined value (NO in Step S10), the travel propriety determination unit 36 guides Even if the rail 8 is not distorted or misaligned, or is distorted or misaligned, the car 2 can be safely and stably guided without contact, and it is normal without repairing the guide rail 8. It is determined that driving can be resumed and the car 2 can travel (step S12).

  The travel possibility determination unit 36 is detected by the pulse value detection unit 33 at the current value acquisition timing by the detection result acquisition unit 35 based on the determination result of whether or not the guide rail 8 needs to be repaired. The car position is added as information on the location indicating whether or not the guide rail 8 needs to be repaired and stored in the storage device 38 (step S13). The processing from step S8 to S13 is continuously performed until the car 2 arrives at the top floor.

  Then, when the car 2 arrives at the top floor (YES in step S14), the traveling availability determination unit 36 includes a determination result that requires repair of the guide rail 8 in the determination result stored in the storage device 38. It is determined whether or not (step S15).

  If the determination result stored in the storage device 38 does not include a determination result that requires repair of the guide rail 8 (YES in step S15), the operation control unit 32 resumes normal operation of the car 2 (step S16). ).

  After the process of step S16 or when the determination result stored in the storage device 38 includes a determination result that requires repair of the guide rail 8 (NO in step S15), the determination result output unit 37 A determination result indicating whether repair is necessary is output to the remote monitoring center as maintenance information together with the car position information added to the determination result (step S17).

  As described above, in the elevator according to the embodiment of the present invention, when an earthquake occurs, the car 2 is operated between the lowermost floor and the uppermost floor, and the current value flowing through the electromagnet for non-contact guidance is set. Based on this, it is possible to output the determination result of whether or not the guide rail 8 needs to be repaired as maintenance information. Therefore, when the guide rail 8 is distorted or displaced, it is necessary to repair the guide rail 8 to resume normal operation, and the position where the repair is necessary can be determined. Can be performed efficiently and accurately. In addition, when the fluctuation range of the current value flowing through the electromagnet greatly increases due to non-contact guidance during traveling after the seismic control operation, the distance between the guide rail 8 and the magnet unit is significantly increased. Since it can be specified that a significant distortion or deviation of the rail 8 has occurred, it is compared with the conventional case where the occurrence of distortion or deviation of the guide rail 8 is detected based on a change in the torque of the hoisting machine. Thus, it is possible to accurately determine whether or not the guide rail 8 needs to be repaired. Therefore, the accuracy of repairing the guide rail 8 can be improved.

  Further, in this embodiment, when it is determined that repair of the guide rail 8 is not required, normal operation is automatically resumed, so that normal service is resumed without the need for maintenance personnel to go to the elevator installation building. be able to.

  In the embodiment described above, when an earthquake occurs during normal operation, it is described that the necessity of repairing the guide rail 8 is determined based on the current value flowing through the electromagnet for non-contact guidance. Not only, but when the elevator is installed, the car 2 is moved between the lowermost floor and the uppermost floor, and the guide rail 8 is repaired based on the value of the current flowing through the electromagnet for non-contact guidance during the traveling. It is possible to determine whether or not it is necessary. By making such a determination, it is possible to easily check the centering error when the guide rail 8 is temporarily assembled at the time of installation of the elevator, so that the man-hours for the centering work can be reduced.

  Further, in the above-described embodiment, it is determined whether or not the guide rail 8 needs to be repaired when there is no passenger in the car 2 after landing at the nearest floor after the occurrence of the earthquake. A load or the like is placed in the car 2 by calculating the predetermined value of the current value for determining whether or not the guide rail 8 needs to be repaired according to the load state of the car 2. Even in this case, it can be determined whether or not the guide rail 8 needs to be repaired.

  The present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be omitted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Hoisting machine, 2 ... Car, 3 ... Main rope, 4 ... Suspension weight, 5 ... Pulse generator, 6 ... Deflection sheave, 7 ... Elevator control panel, 8 ... Guide rail, 9 ... Tail cord, 10 ... Hoistway, 11 ... non-contact guide device, 11a ... magnet unit, 12 ... control device for non-contact guide device, 13 ... load sensor, 14 ... gap sensor, 15 ... permanent magnet, 16 ... electromagnet, 21 ... current detector, DESCRIPTION OF SYMBOLS 22 ... Calculator, 23 ... Electric power supply part, 31 ... Load detection part, 32 ... Operation control part, 33 ... Pulse value detection part, 34 ... Earthquake detection part, 35 ... Detection result acquisition part, 36 ... Driving | running | working propriety judgment part, 37 ... judgment result output unit, 38 ... storage device.

Claims (4)

Guide rails laid vertically in the hoistway;
A car that goes up and down along the guide rail,
An electromagnet mounted on the car and facing the guide rail via a gap, and arranged to share a magnetic path with the electromagnet in the gap and having a magnetomotive force necessary to guide the car A magnet unit with a permanent magnet to supply;
A sensor unit for detecting a state in the gap of the magnetic circuit formed by the electromagnet and the gap and the guide rail;
Guidance control means for stabilizing the magnetic circuit by controlling the excitation current of the electromagnet based on the output of the sensor unit;
Current detecting means for detecting an excitation current value of the electromagnet;
Traveling propriety judging means for judging whether or not the guide rail needs to be repaired by the fact that the longitudinal direction of the guide rail is not parallel to the raising / lowering direction of the car, based on the detection value by the current detecting means;
Output means for outputting a judgment result by the travel propriety judgment means;
An elevator characterized by comprising: An earthquake detection means for detecting the occurrence of an earthquake;
An earthquake operation control means for stopping the car at a predetermined floor when the earthquake is detected by the earthquake detecting means during normal traveling of the car;
After the stop by the earthquake operation control means, the operation control means for causing the car to travel at a lower speed than during normal travel,
The elevator according to claim 1, wherein the current detection unit detects an excitation current value of the electromagnet when the car is traveling by the operation control unit. The determination means includes
When the detection value by the current detection means exceeds a predetermined value, it is determined that the guide rail needs to be repaired by the fact that the longitudinal direction of the guide rail is not parallel to the raising / lowering direction of the car. The elevator according to claim 1. The output means includes
When the determination means determines that the guide rail needs to be repaired, the determination result is output together with the position information of the car at the time of detection by the current detection means that is the basis of the determination. Item 2. The elevator according to item 1.

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