JP4380708B2 - Elevator equipment - Google Patents

Description

  The present invention relates to a speed detection device for a moving body, and without permanently installing permanent marks that serve as a basis for grasping the speed and position of the moving body in surrounding structures and moving paths that form a relative speed with the moving body. The present invention relates to a method and apparatus for detecting the relative speed of a moving object itself with surrounding structures and moving paths, and its application.

  In particular, the present invention can be applied to the case where the speed of an elevator car moving in a hoistway along a guide rail is detected.

  Conventionally, as a method of detecting the speed and position of an elevator car that is an example of a moving body, a permanent mark is provided in a hoistway, and the mark is scanned by a sensor provided in the car. A technique for detecting speed and position is known (see Patent Document 1).

  In addition, a technique is known in which the position of a car is confirmed by detecting a magnetic strip attached to a guide rail for guiding the car as a permanent mark by a sensor attached to the car (Patent Document 2). reference).

JP 2006-52092 A JP-T-2004-536000

  In the prior art, since it is necessary to install permanent marks on all routes along which the moving body moves, there is a problem that the procurement cost, installation cost, and maintenance cost of the marks increase.

  The present invention has been made in consideration of the above-described problems, and a speed detection device capable of detecting the speed, position, or acceleration of a moving body without installing marks for speed or position detection, and An elevator apparatus using the same is provided.

In order to achieve the above object, the present invention provides an elevator apparatus including a passenger car guided by a guide rail and moving in a vertical direction in a hoistway. The elevator apparatus is provided in the passenger car and interlocks with the vertical movement of the passenger car. A speed detecting device that moves, a writing means that is provided in the speed detecting device and writes a constant frequency of residual magnetization fluctuations to the opposing guide rail, and a speed detecting device that is provided in the speed detecting device and relates to the moving direction of the car A plurality of reading means arranged so as to have a predetermined distance and reading the residual magnetization written to the guide rail, and detecting a phase difference of the plurality of reading means according to the movement of the car, The phase difference is converted into velocity.

  According to the present invention, it is not necessary to install permanent marks on all paths along which the moving body moves, so that the procurement cost, installation cost, and maintenance cost of marks can be reduced.

  Hereinafter, an embodiment will be described in which the speed of a car of an elevator, which is an example of a moving body, is detected using speed detection means mounted on the car.

FIG. 1 shows an elevator apparatus according to an embodiment of the present invention. A car 0105 and a counterweight 0107 are connected to each other by a main rope 0106, and the main rope 0106 is wound around a hoisting machine 0108. The hoisting machine 0108 drives the main rope 0106 according to a command from the control device 0111. As a result, the car 0105 and the counterweight 0107 move in the hoistway. The car 0105 moves while being guided by the guide rail 0102. A speed detection device 0112 provided in the car 0105 moves in conjunction with the vertical movement (0113) of the car. The output signal of the speed detection device 0112 is sent to the control device 0111. When the control device 0111 determines that the speed is abnormal from the output signal, the safety device such as the brake 0109 and the emergency stop device 0114 is activated. In addition to transmission to the control device 0111, the output signal of the speed detection device 0112 is directly transmitted to the emergency stop device 0114 installed in the car 0105, and an emergency stop operation is completed only with the equipment installed on the car. May be. In this specification, “installed on the car” means a state where the car is attached to the main member of the car, and is attached in a state where the car is integrated and moved, and the ceiling, side surface, and floor surface inside and outside the car. It shall include the state attached to the member.

FIG. 2 shows the configuration of the speed detection device 0112. Using the writing means 1201 (W), a non-permanent mark is written on the guide rail 0102. The reading means 1202-a (R ₁ ) and 1202-b (R ₂ ) detect the mark on the guide rail 0102. The writing means driving device 1203 drives the writing means 1201 so that the guide rail 0102 can be marked with a non-permanent mark according to a specific variation pattern.

  If the fluctuation of the non-permanent mark is a constant frequency regardless of the moving speed of the car, the output signal waveforms 1204-a (wave1) and 1204 of the reading means 1202-a and 1202-b are set according to the moving speed of the car. A phase difference occurs in -b (wave 2). The speed detection processing unit 1205 will be described later with reference to FIG.

  An example of a non-permanent mark on the guide rail is the magnetization of the guide rail. In the present embodiment and some embodiments described later, a non-permanent mark is overwritten on the guide rail by the writing means as the car moves, and the reading means reads out in a short time. Furthermore, after reading by the reading means, the non-permanent mark is not reused without performing new writing. Therefore, the period during which the non-permanent mark can be read effectively is sufficient only for a short time from the writing of the mark to the guide rail by the writing means until the reading means passes through the guide rail portion.

  Therefore, in consideration of the risk of data loss due to external magnetic noise with a small coercive force, the non-permanent mark in this embodiment is also used for a general guide rail that is usually difficult to use as a permanent mark recording medium. It can be used as a recording medium.

  Here, the necessary conditions of the magnetic characteristics to be satisfied by the guide rail are listed below. First, after the magnetic data is written by the writing means, the coercive force is such that the residual magnetization does not disappear due to background magnetic noise in the vicinity of the guide rail portion where the magnetic data is written, until a plurality of reading means read. thing. In addition, the residual magnetization data that can be read by the reading means in the background magnetic noise environment is an S / N ratio of 0 (dB) or more.

  As an example of the non-permanent mark, there is an example in which lubricating oil is used other than the residual magnetization. Usually, oils and fats are applied by some technique for lubrication between the guide rail and a support mechanism (not shown) that slides or rolls. If the oil and fat is applied, for example, by an ink jet method and marked when applied to the guide rail, it can be used for writing a non-permanent mark by the writing means. At this time, the reading means detects a difference in the application state of the lubricating oil. For example, when the oil or fat exhibits an optical color, an optical detection means is used, and when the oil or fat has magnetism, a magnetic detection means is used. The oils and fats after reading may be made uniform over the entire sliding surface with felt or sponge installed on the car side.

FIG. 3 shows a specific configuration example of the writing unit 1201 and the reading units 1202-a and 1202-b in the case where magnetism is used as a unit for applying a non-permanent mark. In this example, an electromagnet is used as the writing means 1201, but a rotating permanent magnet may be used as long as it can leave a variable residual magnetization on the object to be subjected to the non-permanent mark.

  As the reading means 1202-a and 1202-b, a magnetoresistive effect element, a magneto-impedance element, a Hall element, a pickup coil, or the like can be applied. As appropriate, it may be used in combination with a yoke for converging and guiding magnetic flux.

FIG. 4 shows a configuration example of the speed detection processing unit. The speed detection processing unit corresponds to 1205 in FIG. The magnetization of the guide rail detected by the plurality of reading means 1202-a and 1202-b, that is, the read magnetic data is A / D converted by the A / D conversion means 1301-a and 1301-b, respectively. The data holding means 1302-a and 1302-b are stored as time series data. In the data comparison means 1303, the data holding means 1302-a,
The time series data stored in 1302-b is compared. The speed calculation unit 1304 calculates the speed of the car based on the comparison result information output from the data comparison unit 1303, the writing drive method information 1305 and the position information 1306 of the reading unit, and outputs it as speed information 1307.

In order to correspond to the moving directions of a plurality of cars, another set of unidirectional speed detection mechanisms 1300 are provided at positions sandwiching the writing means 1201 along the moving direction of the cars. In this embodiment, one writing means 1201 is shared for a plurality of unidirectional speed detection mechanisms 1300, but writing means 1201 is provided for each of the plurality of unidirectional speed detection mechanisms 1300. Also good.

  Here, a driving method of the writing unit 1201 and a speed calculation method when the configuration of FIG. 4 is used will be described. Hereinafter, the speed of the car is assumed to be the speed relative to the structure outside the car to which the non-permanent mark is applied, more specifically to the guide rail. Several methods are conceivable for detecting the car speed using the configuration of FIG. One of them is to make the frequency of the residual magnetization fluctuation applied to the opposing guide rail portion of the writing means 1201 constant. Therefore, in the above method, when the speed of the car changes, the spatial frequency of the residual magnetization fluctuation applied to the guide rail changes. If the frequency of the residual magnetization fluctuation applied to the guide rail by the writing unit 1201 is constant, the residuals observed in the reading unit 1 (1202-a) and the reading unit 2 (1202-b) having a certain separation distance in the traveling direction. A phase difference is caused in the fluctuation of the magnetization intensity. This phase difference is extracted by the data comparison means 1303 and is combined with other information and converted into a speed by the speed calculation means 1304. In the above example, the residual magnetization intensity is used as a variable factor. However, any technique that can leave a non-permanent mark on the guide rail by magnetic means, such as the direction of residual magnetization, the combination of direction and intensity, or the code value of multiple tracks. Any method can be applied.

  Further, the time-varying waveform of the residual magnetization may be a sine wave or a waveform having distortion as long as the phase difference can be defined. It is also possible to apply a residual magnetization close to an impulse and calculate the TimeOf Flight time between the reading means 1 and 2.

  In FIG. 4, 1450 and 1330 are not essential in the basic configuration and will be described later.

  Next, a speed calculation method in the speed calculation unit 1304 will be described. Here, the case where the time fluctuation of the residual magnetization intensity is a sine wave of the frequency f will be described as an example.

The fluctuation frequency component of the residual magnetization applied to the guide rail by the writing means is f [1 / s], and the spatial distance between the reading means 1 (1202-a) and the reading means 2 (1202-b) is d ₁₂ [m. ], If the phase difference detected by the data comparison means 1303 is φ _diff [rad], the velocity v [m / s] is obtained by the equation (1).

Further, the minimum velocity v _min [m / s] that can be detected under the above-described conditions is expressed by Expression (2).

Furthermore, when the minimum phase difference that can be detected by the data comparison unit 1303 is φ _{diff_min} [rad], the maximum speed v _max [m / s] that can be detected with the above configuration is expressed by Expression (3).

The magnitude of φ _{diff_min} depends on the magnitude of the phase noise. The magnitude of the phase noise depends on the S / N ratio of the entire system from magnetic data writing to reading, A / D conversion, and various arithmetic processes.

  FIG. 5 shows an example of the arrangement of the writing means and the reading means corresponding to the car movement directions in both the up and down directions. FIG. 5A shows an example of a configuration in which both sides of one writing unit 1201 are sandwiched between two sets of reading units 1202-u and 1202-d in the car moving direction. Now, when the moving direction of the car 0105 is the 0113-u direction, the speed or the like is detected by reading the non-permanent mark using the reading unit 1202-u located on the rear side of the writing unit 1201 in the moving direction. I do. Similarly, when the traveling direction is 0113-d, the speed and the like are detected by reading the non-permanent mark written by the writing unit 1201 using the reading unit 1202-d.

  FIG. 5B shows an example of a configuration in which two sets of reading means 1201-u and 1201-d are sandwiched on both sides of a set of reading means 1202 in the car movement direction. When the moving direction of the car 0105 is the 0113-u direction, the reading unit 1202 reads a non-permanent mark written using the writing unit 1201-u located on the front side of the reading unit 1202 toward the moving direction. The speed etc. are detected. Similarly, when the moving direction is 0113-d, the writing unit 1201-d and the reading unit 1202 are used to detect the speed and the like. As long as the writing unit 1201 precedes the reading unit 1202 with respect to the moving direction of the car, the configuration is not limited to the configuration illustrated in FIGS. 5A and 5B.

Further, as shown in FIG. 5C, when there are a plurality of guide rails, a different speed detection direction may be assigned to each guide rail. Now, it is assumed that the car 0105 faces a plurality of guide rails 0102-d and 0102-u. In speed detection in the 0113-d direction, the non-permanent mark written by the writing unit 1201-d facing the guide rail 0102-d is read using the reading unit 1202-d. Also on the side facing the 0102-u direction, the non-permanent mark written by the writing unit 1201-u is read using the reading unit 1202-u.

  The feature of the configuration of FIG. 5C is that a spatial distance between the writing means and the reading means can be secured. For example, when magnetic information is used as the non-permanent mark, the leakage magnetic flux from the writing unit 1201-d may affect the read value of the reading unit 1202-d. The above-described configuration that allows a large spatial distance from 1202-d is advantageous.

  In addition, each of the plurality of guide rails may be configured to support a plurality of speed detections. With this configuration, reliability can be improved by multiplexing. Further, in the same configuration, a non-permanent mark having different characteristics may be provided for each of the plurality of guide rails. For example, when residual magnetization that varies sinusoidally is used for a non-permanent mark, the detection range such as speed can be expanded by configuring the frequency of the time variation waveform of the residual magnetization for each rail. In FIG. 5, two sets of reading means are always illustrated, but one or three or more may be set as one set according to the application method.

FIG. 11 shows an embodiment using erasing means. In the figure, reference numerals 1206-a and 1206-b denote erasing means for erasing non-permanent marks written on the guide rail 0102. The erasing means 1206 is used for erasing the previously written pattern before writing the non-permanent mark or erasing the written non-permanent mark after reading the non-permanent mark. FIG. 11A shows an example in which the erasing means, the reading means, the writing means, the reading means, and the erasing means are arranged in this order with respect to the car traveling direction. Assume that the moving direction of the car is 0113-u. The preceding eraser 1206-a erases the non-permanent mark remaining on the guide rail 0102 with respect to the car moving direction. Next, the writing means 1201 writes a non-permanent mark on the guide rail 0102, and the reading means 1202-u reads the non-permanent mark, thereby detecting the speed and the like. If necessary, the erasing means 1206-b erases the non-permanent mark remaining on the guide rail 0102. For example, if the non-permanent mark is magnetic, the residual magnetization is erased after detecting the speed, etc. The impact on equipment can be mitigated. Even when the moving direction of the car is 0113-d, it can be similarly implemented by appropriately replacing the suffixes -d and -u, and -a and -b.

  Further, when it is not necessary to erase the residual magnetization after detecting the speed or the like, as shown in FIG. 11B, the reading means, the writing means, and the erasing means may be arranged in this order. According to this configuration, when the moving direction of the car is 0113-u, the preceding erasing unit 1206-a deletes the non-permanent mark remaining on the guide rail 0102 with respect to the moving direction of the car, and the writing unit 1201 A non-permanent mark is written on the guide rail 0102, and the reading means 1202-u reads the non-permanent mark, thereby detecting the speed and the like. Even when the moving direction of the car is 0113-d, the speed and the like are detected with a configuration in which suffixes are appropriately replaced.

  FIG. 11C shows an example of an arrangement in which both ends of the reading unit are sandwiched by the writing unit and both ends are sandwiched by the erasing unit. Assume that the moving direction of the car is 0113-u. The preceding eraser 1206-a erases the non-permanent mark remaining on the guide rail 0102 with respect to the car moving direction. Next, the writing means 1201-u writes a non-permanent mark on the guide rail 0102, and the reading means 1202 reads the non-permanent mark, thereby detecting the speed and the like. When the moving direction of the car is 0113-d, it can be similarly implemented by appropriately replacing the suffixes -d and -u, -a and -b. In this arrangement, when the non-permanent mark is magnetic, the magnetic field generated by the two writing units 1201-u and 1201-d is driven under the condition that the magnetic field is canceled in the vicinity of the reading unit 1202. There is an advantage that leakage magnetic flux observed in the space near the reading means 1202 can be reduced.

FIG. 6 shows an embodiment in which the detection range is expanded by using three or more readout means for one speed detection direction. As described above, when data of two reading means is used for one speed detection direction, the minimum detectable speed is limited by the above formula (2). Similarly, the maximum speed is limited by the above equation (3). Fixing now fluctuation frequency component f, in order to reduce the detectable minimum speed, by reducing the spatial distance d ₁₂ between a plurality of reading means, it produces a detectable maximum velocity is also reduced side effects. Therefore, as a countermeasure, when three reading means are used for one speed detection direction, three intervals of d ₁₂ [m], d ₂₃ [m], and d ₃₁ [m] are used as intervals between the plurality of reading means. Combinations can be used and the range of detectable speeds can be expanded. The spatial distance between the three reading means is expressed as d ₁₂ [m] <d _23.
If [m] <d ₃₁ [m], a combination of reading means 1202-a and 1202-b (R ₁ , R ₂ ) having a small spatial distance d ₁₂ is used to detect a small car speed.

Similarly, for detecting a large car speed, a combination of reading means 1202-a and 1202-c (R ₁ , R ₃ ) having a large spatial distance is used. The detection of the intermediate car speed, processing the read-out means 1202-b and 1202-c output signal waveform 1204-b of the _{(R 2, R 3),} 1204-c (wave2, wave3). When there is an overlap in the speed ranges that can be detected by the above three combinations, reliability is improved by performing rationality determinations on each other. Similarly, the speed range may be further expanded by using it for the determination of phase wrapping based on the mutual relationship between phases. Further, four or more reading means may be used for one speed detection direction.

  FIG. 7 shows an embodiment in which one reading unit is used for one speed detection direction. In the present embodiment, a virtual read waveform 1402 (wave 0) is generated using a phase and waveform adjuster 1401 based on information from the writing means driving device 1203. The subsequent speed calculation processing is the same as the speed detection processing in FIG. 4 except that the virtual readout waveform 1402 and the actual readout waveform 1204 (wave1) detected by the readout means 1202 are used as input data. Here, the virtual readout waveform is a waveform output from the virtual readout unit when it is assumed that the virtual readout unit exists at the position of the writing unit 1201. Next, a method for generating the virtual read waveform 1402 will be described. The writing means driving device 1203 includes a controller portion 1203-c for instructing the strength of the writing level of the non-permanent mark by the writing means, and a driver portion 1203-d for outputting the driving means 1201 based on the command value. Roughly divided into The phase and waveform adjuster 1401 receives the write level instruction information that the controller portion 1203-c gives to the driver portion 1203-d, and generates a virtual read waveform 1402. As a specific example of the instruction information, when the controller portion 1203-c is configured by an analog circuit, it is an analog value that electrically represents voltage / current / frequency / pulse interval / various modulation waves. When the controller portion 1203-c is a digital circuit such as a microcomputer, the subsequent processing A / D conversion may be saved by outputting the virtual read waveform 1402 as numerical data. Further, the microcomputer may perform D / A conversion, convert it into various analog values, and output it. Further, it may be output as a pulse-modulated wave via a digital I / O.

  In the above configuration, the distance corresponding to the spatial distance of the reading unit is the distance drw between the writing unit 1201 and the reading unit 1202. Of the functions of the phase and waveform adjuster 1401, the phase adjustment function may be implemented in software within the data comparison unit 1303 shown in FIG. Further, the virtual readout waveform 1402 does not need to exactly reproduce the readout waveform of the virtual readout means at the position of the writing means 1201, and if the relative phase difference with the virtual readout waveform is constant. good. The phase difference can be corrected in the data comparison unit 1303. By combining this embodiment with the embodiment of FIG. 11C described above, a single reading means can be used to face the moving directions of a plurality of cars. In particular, in the embodiment of FIG. 11C, when residual magnetization is used as a means for non-permanent mark and a magnetic field canceling effect is aimed, reading is performed near the magnetic neutral point because there is only one reading means. Since the means can be installed, the offset effect can be improved.

  FIG. 8 shows an example in which a non-permanent mark remains on a recording medium such as a guide rail for an intermediate period. The intermediate period is a period that is longer than a period in which the car makes one round trip in the hoistway and less than a period in which the mark can be considered permanent. More specifically, a time period in which the time interval of maintenance operation for maintaining the non-permanent mark in a state where it can be effectively read can be set to a time interval that does not hinder the operation of the speed detection target moving body. It is. For example, when a magnetic non-permanent mark is used, the coercive force of the guide rail is sufficiently large and can maintain a residual magnetic flux density at a level sufficient for detection by the reading means over several days. This method can be applied to any operation form that allows at least one non-permanent mark rewriting operation within one day, which is a shorter time interval.

  In this method, since it is not necessary to always write non-permanent marks in various speed ranges of the car, it is possible to use non-permanent marks that are spatially equidistant. In the use of spatially equidistant marks, the speed of the car can be easily calculated from the frequency of the readout signal and the space between the marks, and the relative movement distance of the car can be calculated from the fluctuation count value of the readout signal. The moving direction can be obtained from each known two-phase encoding method, and there are various advantages. As a method of applying a non-permanent mark to the guide rail, as shown in FIG. 8A, the car 0105 is moved at a constant speed during a maintenance operation or the like, and the writing means 1201 is driven at a constant frequency to drive the guide rail. 0102 is magnetized at equal intervals. Any method other than driving the car at a constant speed and driving the writing means at a constant frequency may be used as long as the space intervals between the non-permanent marks applied to the guide rail 0102 are equal. After the non-permanent mark maintenance operation is completed, during normal operation, the speed is detected by using one reading means 1202 as shown in FIG. At this time, the moving speed of the car is converted from the frequency of the output signal from the reading means 1202. In this system, since the non-permanent mark is not written on the guide rail during normal operation, the writing means 1201 does not necessarily have to be on the car. Therefore, the moving body corresponding to the car 0105 shown in FIG. 8A does not necessarily need to be integrated with the car 0105 shown in FIG. 8B.

  FIG. 9 shows a flow of a method of magnetizing the guide rail at equal intervals. First, it is determined whether or not non-permanent mark maintenance is necessary (step 1481). As a criterion for determination, there is used whether or not a certain time (for example, once a day) has passed since the previous maintenance, or whether or not the read level of the non-permanent mark falls below a preset threshold value. For the determination of the level, an output signal from the reading unit 1202 can be used. Next, before the non-permanent mark writing operation is performed, confirmation of the presence or absence of passengers, display during inspection operation, processing for contacting the higher-level elevator remote monitoring system, and the like are performed (step 1482). Next, a non-permanent mark is applied to the guide rail at regular intervals while moving the car at a constant speed or a known speed change rate (step 1483). Step 1484 is an operation for confirming the writing result. The car is moved at a constant speed or a known speed change rate, and the writing result of the non-permanent mark is confirmed with the output from the reading means. Note that the task according to this flow is executed by the operation mode switching unit 1456 of FIG. 4 based on information from the input / output unit 1457.

The position and speed when the method of magnetizing the guide rails at equal intervals is detected by the processing unit 1450 in FIG. Using the output from the frequency analysis means 1331 and the write pitch information 1451 of the guide rail magnetization, the speed calculation means 1452 calculates the speed. The position calculating unit 1454 calculates a relative moving distance from the wave number of the output signal fluctuation from the reading unit 1202 and the writing pitch information 1451 of the guide rail magnetization.

  FIG. 10 shows a non-permanent non-permanent mark that is spatially equidistant when the non-permanent mark remains on a recording medium such as a guide rail for a shorter period than the target period in the embodiments of FIGS. This is an embodiment using a target mark. In the present embodiment, the non-permanent mark read level is obtained by rewriting the spatially equally spaced non-permanent mark applied in advance during normal operation in which passengers are carried, at spatially even intervals. Hold.

  As a method of applying non-permanent marks that are spatially equidistant in advance, the method of writing marks at a constant frequency while operating the car at a constant speed during the maintenance operation shown in the embodiment of FIG. 8 can be used. You may write a non-permanent mark at the time of manufacture of a guide rail, or at the time of guide rail construction to a hoistway. The above method is because there is a case where there is little decrease in the read level of the non-permanent mark if the car is not operated.

  In normal operation in which passengers are traveling, the speed of the car is not always constant. Therefore, in the rewriting of the non-permanent mark, it is necessary to change the writing frequency in order to realize a non-permanent mark that is spatially equidistant. The core of the control of the writing frequency is a waveform feedback means 1403 shown in FIG.

The operation will be described below with reference to the drawings. It is assumed that the non-permanent mark is magnetic. When the moving direction of the car 0105 is the upward direction (0113), an output signal from the reading unit 1202 preceding the writing unit 1201 with respect to the moving direction is fed back to the writing unit driving device 1203 via the waveform feedback unit 1403. Based on the feedback information, the writing means driving device 1203 drives the writing means 1201 to magnetize the guide rail 0102 and write magnetic data. In this embodiment, the range 1404 is a magnetic data overwritten section. The waveform feedback unit 1403 adjusts the magnetization, that is, the phase of the magnetic data, based on the interval drw between the reading unit 1202 and the writing unit 1201. For example, when drw is an integral multiple of the writing pitch of magnetic data, the writing means driving device 1203 is controlled so that magnetic data of the same phase is written. If the installation distance between the reading unit 1202 and the writing unit 1201 cannot be set to an integral multiple of the writing pitch of the magnetic data due to constraints on the layout or reading timing of the magnetic data in consideration of leakage magnetic flux, the waveform feedback unit 1403 Adjust the phase.

  In this embodiment, when the writing unit 1201 is written as W and the reading unit 1202 is written as R, the non-permanent mark writing range at the end of the hoistway can be expanded by arranging them in the order of W-R-W.

  In the above embodiment, the moving direction of the car has been described as the vertical direction. However, the method of the present invention can be applied to an elevator that moves in an oblique direction, a horizontal direction, or an arbitrary geometric shape, or a moving body in general.

  A necessary condition for general application to a mobile object is that a medium capable of writing a non-permanent mark serving as a reference for the relative speed of the mobile object exists, and a writing means and a reading means can be mounted on the mobile object. As an example, a railroad has a rail that can be marked with a non-permanent mark, and a writing unit and a reading unit can be mounted on a vehicle that is a moving body, so the above condition is easily satisfied.

  Note that the present invention is not limited to the above embodiments, and various embodiments are possible within the scope of the technical idea of the present invention.

The elevator apparatus which is one Example of this invention is shown. The structure of a speed detection apparatus is shown. A specific configuration example of the writing unit and the reading unit is shown. The structural example of a speed detection process part is shown. An example of the arrangement of writing means and reading means suitable for dealing with the movement of the car in both directions up and down will be shown. An embodiment using three reading means will be described. An embodiment using one reading means will be described. An embodiment in which the guide rail is magnetized at equal intervals will be described. The flow of the method of magnetizing a guide rail at equal intervals is shown. An example is shown in which equidistant magnetization is performed during normal operation. An embodiment using erasing means will be described.

Explanation of symbols

0102 Guide rail 0105 Ride car 0106 Main rope 0107 Balance weight 0108 Hoisting machine 0109 Brake 0111 Control device 0112 Speed detection device 0113 Car moving direction 0114 Emergency stop device 1201 Writing means 1202 Reading means 1203 Writing means driving device 1205 Speed detection processing unit 1206 Erasing Means 1301 A / D conversion means 1302 Data holding means 1303 Data comparison means 1304 Speed calculation means 1305 Write drive method information 1306 Read means position information 1331 Frequency analysis means 1332 Acceleration calculation means 1401 Phase and waveform adjuster 1403 Waveform feedback means 1451 Guide Rail magnetization writing pitch information 1452 Speed calculation means 1454 Position calculation means 1456 Operation mode switching means 1 57 input and output means

Claims (4)

In an elevator apparatus provided with a car that is guided by a guide rail and moves up and down in the hoistway,
A speed detection device that is provided in the car and moves in conjunction with the vertical movement of the car;
Writing means provided in the speed detection device and writing the frequency of the residual magnetization fluctuation to the opposing guide rail as a constant;
Readout means provided in the speed detection device, arranged in plural so as to have a predetermined distance with respect to the moving direction of the car, and reading out the residual magnetization written in the guide rail;
An elevator apparatus comprising: detecting a phase difference between a plurality of the reading means according to movement of the car, and converting the phase difference into a speed . 2. The elevator apparatus according to claim 1, further comprising: means for erasing the magnetization written on the guide rail by the writing means . 2. The elevator apparatus according to claim 1, wherein a plurality of the reading means are provided on both sides of the writing means with respect to a moving direction of the car . The operation mode for maintenance according to claim 1, wherein the writing means is used to magnetize the guide rail along a moving direction of the car, and the operation of the writing means is paused and remains on the guide rail. An elevator apparatus comprising: a normal operation mode in which magnetization is detected by the reading means .

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