JP6214404B2 - Car position detector - Google Patents

Description

  The present invention relates to an apparatus for detecting an elevator car position by an eddy current method.

  In general, an elevator connects a passenger car and a counterweight on which a passenger gets on with a rope, and the rope is wound up and down by a motor to control the elevator in a hoistway with a low load. The car position can be detected by counting incremental pulses output from an encoder connected to the motor. However, in reality, the pulley connected to the shaft of the motor causes slipping and stretching of the rope. Therefore, the method of counting the output pulses of the encoder may not detect the car position accurately.

  That is, when landing a car on a specified floor, the car position is set so that the step between the floor of the car and the landing floor of the planned floor will be zero based on the output pulse count of the encoder. If controlled, a landing error (step) may occur.

In order to prevent the occurrence of such a level difference, the following method is employed.
That is, a metal plate is installed at a certain height from the landing side floor surface of each floor. Then, when the detector provided on the car detects the edge of the metal plate, the remaining distance to the planned stop floor determined based on the output pulse count of the encoder is once reset. Furthermore, the distance (setting value) from the landing side floor surface to the installation position of the metal plate is reflected in the motor control. Note that the area where the reset is performed (the range of the metal plate) is called a door zone.

  Further, according to the rules of the Building Standard Law, the door opening operation must not be performed in a state where the floor surface of the car and the floor surface on the landing side are separated by a certain height or more. Therefore, it is necessary to have a function for determining whether or not the car position is located in the door opening operable zone (relevel zone).

  A function of installing an identification plate such as a metal plate in the hoistway where the car ascends and descends as described above, and a detector for detecting the identification plate is provided on the car, and this detector detects the edge of the identification plate. There is an elevator landing position detecting device having

  The detection method of the identification plate in such a landing position detecting device includes an optical type using a photoelectric sensor, a magnetic type using a magnetic sensor, a magnetic reed switch, etc., a capacitance type, an eddy current type, a resonance type, etc. Several methods such as a coil type are used. The optical type can detect the identification plate with high accuracy, but has a disadvantage that it is vulnerable to dust, water droplets, and ambient light. On the other hand, the magnetic type, the capacitance type, the eddy current type, the resonance coil type, etc. are superior in environmental resistance compared to the optical type. Therefore, it is common to employ a system other than the optical system for the switch and sensor that play the role of a safety system that prevents a serious accident in an elevator.

  For example, Patent Document 1 discloses an eddy current detection method. Specifically, a conductive metal plate is installed on a guide rail that guides the elevator car and the balance weight, and the car is provided with an eddy current sensor. And the position and speed of a cage | basket | car are detected using the output signal from the sensor at the time of this eddy current sensor and the identification board facing.

JP 2008-37557 A

  In the landing position detection apparatus as described above, it is known that the output of the detector varies greatly according to the variation in the distance between the identification plate and the detector. Some of the devices have a function of determining whether or not the car is located in the relevel zone.

  At this time, in order to identify the door zone and the relevel zone, it is conceivable to divide the output from the detector by a plurality of threshold values. However, in this case, when the distance between the identification plate and the detector varies, there is a problem that accurate identification becomes difficult.

  In addition, when the door zone and the relevel zone are detected by separate position detecting means, a plurality of detectors and an identification plate are required, which increases the cost.

  The present invention has been made to solve such a problem, and is based on providing a car position detecting device capable of detecting the position of a car with respect to a door zone and a relevel zone with high accuracy at a low cost. Purpose.

In order to achieve the above object, the present invention is configured as follows.
In other words, the car position detection device according to one aspect of the present invention detects the car position of the elevator by the sensor detecting the identification conductor. The identification conductor includes a first region in which a plurality of holes are formed so as to have a first conductance, and a second region having a second conductance different from the first conductance. The sensor includes a magnetic field generator that generates a magnetic field with respect to the identification conductor, a magnetic field detector disposed in a pair with the magnetic field generator, and a signal processing unit electrically connected to the magnetic field detector. Prepare. The magnetic field detector detects an eddy current magnetic field generated from the identification conductor by the magnetic field from the magnetic field generator, and the signal processing unit uses the amplitude and / or phase information of the eddy current magnetic field obtained from the output of the magnetic field detector. The positional relationship between the identification conductor and the sensor is identified.

  According to the car position detection apparatus of one aspect of the present invention, the elevator car is provided with a magnetic field detector and a signal processing unit, and the output of the magnetic field detector is extracted as phase and / or phase information by the signal processing unit. It can be detected whether the position is, for example, in the door zone, in the relevel zone, or outside both zones. Further, for example, by dividing the detection signal from the magnetic field detector by a plurality of threshold values, it is possible to make it less susceptible to the influence of fluctuations in the detection signal, thereby realizing an apparatus with high car position detection accuracy.

  Furthermore, since two different detection signals of phase and amplitude are extracted from the output signal of the magnetic field detector, only one magnetic field detector is sufficient. In addition, the identification conductor can be manufactured with one member by simultaneously performing the punching process when the die is cut out from one member. As a result, the car position detection device can be provided at low cost.

It is the schematic which shows the structure of the elevator using the car position detection apparatus which concerns on Embodiment 1 of this invention. It is a block diagram which shows the car position detection apparatus which concerns on Embodiment 1 of this invention. It is the figure which looked at the identification board of the car position detection device from the sensor side. It is a graph which shows an example of the relationship of the electrical conductivity x board thickness of a conductor, the occupation rate of a hole, and the magnitude | size (amplitude) of an eddy current magnetic field. It is a graph which shows an example of the relationship of the electrical conductivity x board thickness of a conductor, the occupation rate of a hole, and the phase of an eddy current magnetic field. It is a figure which shows an example of the positional relationship of a sensor and an identification board in each time when a sensor moves in FIG. 2A. 5 is a graph showing an example of an output waveform of a detection coil and an output waveform of a signal processing circuit in the time passage shown in FIG. 4. FIG. 5 is an explanatory diagram showing an example of the relationship between the position of the sensor with respect to the identification plate and the output signals of the holes, the phase difference detection circuit, the amplitude value detection circuit, and the comparator in the sensor movement shown in FIG. 4. . It is a graph which shows an example of the relationship between the clearance gap between a sensor and an identification board, the amplitude of an eddy current magnetic field, and a phase. It is a block diagram which shows the 1st modification of the cage position detection apparatus shown to FIG. 2A (the 1). It is a block diagram which shows the 1st modification of the cage position detection apparatus shown to FIG. 2A (the 2). It is a block diagram which shows the 2nd modification of the cage position detection apparatus shown to FIG. 2A. It is a block diagram which shows the 2nd modification of the cage position detection apparatus shown to FIG. 2A (the 1). It is a block diagram which shows the 2nd modification of the cage position detection apparatus shown to FIG. 2A (the 2). It is a figure which shows an example of the magnetic force line produced in the modification of FIG. It is a block diagram which shows the car position detection apparatus which concerns on Embodiment 2 of this invention. It is a graph which shows an example of the relationship of the electrical conductivity x board thickness of a conductor, the occupation rate of a hole, and the output (amplitude) of a detection coil. It is a graph which shows an example of the relationship of the electrical conductivity x board thickness of a conductor, the occupation rate of a hole, and the output (phase) of a detection coil. It is a figure which shows an example of the positional relationship of the sensor and identification board in each time when the sensor shown in FIG. 13 moves. It is explanatory drawing which shows an example of the output waveform of a detection coil in the time passage shown in FIG. 15, and the output waveform of a signal processing circuit. FIG. 16 is a diagram illustrating an example of a relationship between a sensor position with respect to an identification plate and a phase difference detection circuit, an amplitude value detection circuit, and a comparator in the sensor movement illustrated in FIG. 15. It is explanatory drawing corresponding to FIG.6 and FIG.17 for demonstrating the car position detection apparatus which concerns on Embodiment 3 of this invention. It is a block diagram which shows the car position detection apparatus which concerns on Embodiment 4 of this invention. It is a figure which shows an example of the relationship between the position of the sensor with respect to the identification board with which the cage position detection apparatus shown in FIG. 19 is provided, and each output signal of a phase difference detection circuit, an amplitude value detection circuit, and an offset correction circuit. It is a figure which shows the modification of the identification board with which the car position detection apparatus shown in FIG. 19 is equipped (the 1). It is a figure which shows the modification of the identification board with which the car position detection apparatus shown in FIG. 19 is equipped (the 2). It is a contour figure which shows distribution of the eddy current which flows into the surface of a conductor. It is a conceptual diagram which shows the coupling relationship between a detection coil and an excitation coil, and a conductor. It is a block diagram which shows the car position detection apparatus which concerns on Embodiment 5 of this invention. It is a graph which shows the real number component of the output voltage of the detection coil in FIG. 14A and FIG. 14B. It is a graph which shows the imaginary number component of the output voltage of the detection coil in FIG. 14A and FIG. 14B. It is a block diagram which shows the identification board with which the car position detection apparatus which concerns on Embodiment 6 of this invention is equipped. It is a conceptual diagram which shows the change of the shape of the eddy current which arises in an identification board with raising / lowering of a car, (a) respond | corresponds to the identification board of FIG. 2B, (b) respond | corresponds to the identification board of FIG. It is a graph which shows an example of the relationship between the inductance and slot interval of an eddy current, and the magnitude | size (amplitude) of an eddy current magnetic field. It is a graph which shows an example of the relationship between the inductance and slot interval of an eddy current, and the phase of an eddy current magnetic field. It is a figure which shows the modification of the identification board shown in FIG. 26 (the 1). It is a figure which shows the modification of the identification board shown in FIG. 26 (the 2). It is a figure which shows the modification of the identification board shown in FIG. 26 (the 3). It is a figure which shows the 2nd modification of the identification board shown in FIG. It is a block diagram which shows the identification board with which the car position detection apparatus which concerns on Embodiment 7 of this invention is equipped. It is a graph which shows an example of the relationship between the inductance and slot interval of an eddy current, and the magnitude | size (amplitude) of an eddy current magnetic field. It is a graph which shows an example of the relationship between the inductance and slot interval of an eddy current, and the phase of an eddy current magnetic field. FIG. 32 is a diagram showing a modification of the identification plate shown in FIG. 31 (No. 1). FIG. 32 is a diagram showing a modification of the identification plate shown in FIG. 31 (No. 2). FIG. 32 is a view showing a modification of the identification plate shown in FIG. 31 (No. 3). It is a figure which shows the 2nd modification of the identification board shown in FIG. It is a graph which shows the change of the inductance at the time of changing the aspect-ratio of a virtual coil part.

  A car position detection apparatus according to an embodiment of the present invention will be described below with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected about the same or similar component.

Embodiment 1 FIG.
FIG. 1 is a schematic diagram showing the configuration of an elevator using the car position detection device according to Embodiment 1 of the present invention.
FIG. 1 shows a state in which the car 40 is at the landing entrance 10. The landing entrance 10 includes a landing ceiling 1 and a landing floor 2. In such an elevator, the passenger car 40 and the counterweight are connected by a rope 60, and the rope 60 is wound and unwound by a motor, whereby the passenger car 40 is moved up and down in the hoistway 50. The hoistway 50 is composed of the landing entrance 10 and the side wall 3. The moving amount and moving direction of the rope 60 are managed by an elevator control device (not shown).

  Further, the position of the car 40 can be detected by counting incremental pulses output from an encoder connected to the motor. The pulse count value is reset when the car position detection device 101 detects the door zone. Thereafter, the motor is controlled by the set value, and the car 40 is landed on a predetermined floor. In addition, a signal cable for performing signal transmission between the car 40 and the elevator control device is provided at the lower part of the car.

FIG. 2A is a configuration diagram showing the car position detection device according to Embodiment 1 of the present invention. Also in FIG. 2A, the identification plate 120 is fixed to the side wall of the hoistway 50. The sensor 130 is installed in the car 40 and is movable in the elevator lifting / lowering direction (± X direction).
As shown in FIG. 2A, the car position detection apparatus 101 includes an identification plate 120 and a sensor 130, and detects the car position when the sensor 130 detects the identification plate 120. The identification plate 120 corresponds to an example of an “identification conductor” in the claims.

  As shown in FIG. 1, the sensor 130 is installed on the car 40 side, the identification plate 120 is installed on the side surface of the hoistway 50, and the identification plate 120 and the sensor 130 are arranged via a gap. . The identification plate 120 is fixed to the lower side of the landing floor, and the sensor 130 is fixed to the lower side of the car 40 to the landing side. However, the present invention is not limited thereto, and as long as the sensor 130 can detect the identification plate 120, the sensor 130 may be installed in any part of the car 40. Similarly, the identification plate 120 may be a hoistway. It may be fixed at any position of 50. Furthermore, contrary to the first embodiment, the sensor 130 may be disposed on the hoistway 50 side and the identification plate 120 may be disposed on the car 40 side.

Next, the configuration of the sensor 130 will be described.
The sensor 130 includes an excitation coil 131B that generates a magnetic field with respect to the identification plate 120, a detection coil 131A disposed in a pair with the excitation coil 131B, and signal processing electrically connected to the detection coil 131A and the excitation coil 131B. The main part. The sensor 130 further includes an AC power source 132 that applies an AC voltage having a frequency f to the exciting coil 131B. The detection coil 131A and the excitation coil 131B correspond to examples of “magnetic field detector” and “magnetic field generator” in claims.

  The detection coil 131A and the excitation coil 131B are wound around a coil bobbin 131C made of, for example, a nonmagnetic material. Excitation coil 131B is electrically connected to AC power supply 132. As shown in FIG. 2A, the detection coil 131 </ b> A is disposed close to the identification plate 120, for example. The coil bobbin 131C is one member and extends in a direction that intersects, preferably orthogonally intersects with the longitudinal direction of the identification plate 120. In each drawing, a case where the coil bobbin 131C is arranged orthogonal to the longitudinal direction of the identification plate 120 is shown.

  The signal processing unit includes an AC magnetic field component removal circuit 133, a phase difference detection circuit 134, an amplitude value detection circuit 135, comparators 136 and 137, and the like. The AC magnetic field component removal circuit 133 is electrically connected to the phase difference detection circuit 134 and the amplitude value detection circuit 135. The phase difference detection circuit 134 is electrically connected to the comparator 137, and the amplitude value detection circuit 135 is electrically connected to the comparator 136. It is connected. The comparators 136 and 137 correspond to an example of a “comparator” in the claims.

  The AC magnetic field component removal circuit 133 outputs a voltage V1 obtained by extracting only the eddy current magnetic field component from the voltage waveform output from the detection coil 131A. The AC magnetic field component removal circuit 133 can be configured by, for example, a delay circuit and a differential amplifier, or a Wheatstone bridge circuit.

  The amplitude value detection circuit 135 extracts the amplitude voltage V2 from the output voltage V1 of the AC magnetic field component removal circuit 133 and outputs it to the comparator 136. The comparator 136 compares the input amplitude voltage V2 with a predetermined threshold value, and outputs the voltage V4 as High (1) when the amplitude voltage V2 is equal to or greater than the threshold value. On the other hand, when the amplitude voltage V2 is less than the threshold value, the comparator 136 outputs the voltage V4 as Low (0).

  The phase difference detection circuit 134 outputs to the comparator 137 a voltage V3 that is proportional to the phase difference between the output voltage V1 of the AC magnetic field component removal circuit 133 and the output current waveform of the exciting coil 131B. The comparator 137 compares the input voltage V3 with a predetermined threshold value, and when the phase difference is equal to or greater than the threshold value, outputs the voltage V5 as High (1). On the other hand, when the phase difference is less than the threshold value, the comparator 137 outputs the voltage V5 as Low (0).

  Although the setting method of each threshold value of the voltages V2 and V3 will be described later, the positional relationship between the identification plate 120 and the sensor 130 can be identified by setting a plurality of threshold values in this way.

FIG. 2B is a view of the identification plate of the car position detection device as viewed from the sensor side.
The identification plate 120 is a single conductor plate and includes a holeless portion 121 and a hole portion 122, and generates an eddy current when an AC magnetic field acts from the outside. The holeless portion 121 and the hole portion 122 of the identification plate 120 are continuously arranged in the longitudinal direction along the elevator lifting / lowering direction. The shape of the hole formed in the perforated portion 122 is assumed to be a circle, but may be any shape such as a polygon such as a triangle or a rectangle, or an ellipse. However, the shape of the hole is preferably isotropic in the ascending / descending direction (X direction) of the car 40 and the direction (Y direction) perpendicular to the ascending / descending direction. Further, as the material of the identification plate 120, for example, magnetic SUS (stainless steel), nonmagnetic SUS, Cu, Al, or the like can be used. Further, the identification plate 120 is manufactured by performing a punching process at the same time when the die is cut from one plate material.

  Here, with reference to FIG. 3A and FIG. 3B, a general interaction between the conductor in which a plurality of holes are formed and the detection coil 131A and the excitation coil 131B will be described. 3A and 3B, the holes formed in the conductor are sufficiently smaller than the closest distance L between the conductor and the detection coil 131A or the excitation coil 131B, and the holes are formed substantially uniformly. As the conductor, a plate-like conductor as in the first embodiment is assumed.

FIG. 3A and FIG. 3B are graphs showing an example of the relationship between the conductivity of the conductor × the plate thickness and the hole occupancy, and the magnitude (amplitude) and phase of the eddy current magnetic field. 3A and 3B, the horizontal axis represents conductivity × plate thickness σ · d and the hole occupation ratio p, and the vertical axis represents the magnitude (amplitude) and phase of the eddy current magnetic field, respectively.
“Hole occupation ratio” indicates a ratio (percentage) of a hole occupied by a conductor, which can be calculated based on a hole diameter and a hole interval. p = 0% indicates that there is no hole, and p = 100% indicates that there is no conductor.

  In general, when an AC magnetic field is applied to a conductor, an eddy current flows from the conductor surface to the inside. The value of the eddy current magnetic field generated from this eddy current, that is, the amplitude and the phase, is determined when the conductor external dimensions (vertical and horizontal), magnetic permeability μ, and AC magnetic field frequency are constant. Is proportional to Therefore, the output voltage from the detection coil 131A outside the conductor is proportional to the conductivity σ × the plate thickness d.

FIG. 22 is a contour diagram showing the distribution of eddy current flowing on the surface of the conductor. FIG. 23 is a conceptual diagram showing a coupling relationship between the detection coil 131A and the excitation coil 131B and the conductor.
When the conductor is sufficiently large, the eddy current flows circularly as shown in FIG. At this time, when viewed from the detection coil 131A outside the conductor, the conductor portion through which the eddy current flows can be regarded as a virtual coil portion having an inductance L along the shape of the eddy current distribution. That is, as shown in FIG. 23, the detection coil 131A, the excitation coil 131B, and the conductor can be regarded as an electric circuit coupled with certain coupling constants K1 and K2. The entire circuit showing the conductor is a series circuit of the inductance L and the resistance R of the conductor (that is, proportional to conductivity σ × plate thickness d). Therefore, by changing the occupation ratio of the holes in the conductor, it is possible to change the apparent resistance of the conductor and arbitrarily change the amount of eddy current generation in the conductor.
From the above, the output voltage from the detection coil 131A outside the conductor is proportional to the hole occupation ratio.

  Returning to FIG. 3A and FIG. 3B, focusing on the horizontal axis σ · d, the amplitude and phase of the eddy current magnetic field increase monotonically at the beginning as the conductivity × plate thickness increases, and thereafter converge to a constant value. It turns out that it shows the tendency to do. Next, paying attention to the horizontal axis p, it can be seen that the increase in the hole occupancy rate in the conductor exhibits the opposite behavior to the increase in the conductivity × plate thickness.

  Thus, changing the occupancy rate of the holes has the same effect as changing the conductivity and the plate thickness. For example, when the plate thickness is constant, when the hole occupation ratio changes, the apparent conductivity, in other words, the conductance of the conductor changes. This corresponds to a change in resistance R (= 1 / conductance) in the conductor in FIG. Furthermore, when the hole diameter is large or the holes are formed unevenly, when the sensor 130 moves in the elevator lifting / lowering direction (X direction), the flow of eddy currents corresponds to each hole. Change. In FIG. 23, this corresponds to a change in the inductance L in the conductor. Thereby, the generated eddy current magnetic field also changes corresponding to each hole. The change in the inductance L will be described later in detail.

  Therefore, it is preferable that the hole diameter of the hole 122 is sufficiently small. At this time, the hole diameter is set to be smaller than at least the closest distance L between the identification plate 120 and the detection coil 131A or the excitation coil 131B. When the shape of the hole is other than a circle, the area of the hole is set to be smaller than the area of a circle whose diameter is the closest distance L between the detection coil 131A or the excitation coil 131B and the identification plate 120.

  Each hole is preferably formed with uniform dimensions and intervals. Furthermore, it is preferable that each hole is isotropically distributed in the X direction and the Y direction. Thereby, even when the car 40 moves in the X direction, the flow of the eddy current hardly changes. As a result, the change in the eddy current magnetic field corresponding to each hole can be suppressed.

Furthermore, for the same reason, the perforated portion 122, preferably with a hole formed in two or more density per area defined by L ^2.

  In this way, by changing not only the conductivity and plate thickness of the conductor, but also the hole occupancy (hole diameter, hole interval), the conductance, that is, the amplitude and phase of the eddy current can be freely changed in the same conductor. Is possible. The amplitude value and phase of the eddy current magnetic field have a relationship of “no conductor” <“with conductor hole” <“without conductor hole”, and this relationship is used to detect the amplitude value and phase of the eddy current magnetic field. The positional relationship between the detection coil 131A and the excitation coil 131B and the identification plate 120 can be known.

  In addition, when an AC magnetic field is applied to the conductor, an eddy current corresponding to the conductivity and thickness of the conductor is generated in the conductor, and an eddy current magnetic field is generated from the conductor accordingly. Therefore, by providing a magnetic sensor such as a coil, a Hall element, or a magnetoresistive element as a magnetic field detector for detecting an eddy current magnetic field and an alternating magnetic field in the vicinity of the conductor, an eddy current magnetic field can be obtained from the output signal of the magnetic sensor. Only, or the amplitude value of the combined magnetic field of the eddy current magnetic field and the alternating magnetic field, and the amount of phase change with respect to the alternating magnetic field.

Applying the above theory to the interaction between the identification plate 120 of the first embodiment, the detection coil 131A, and the excitation coil 131B can be explained as follows.
That is, when an alternating current having a frequency f and a constant amplitude is supplied from the AC power source 132 to the exciting coil 131B, an alternating magnetic field having a frequency f is generated around the exciting coil 131B. An AC magnetic field from the excitation coil 131B can be detected by the detection coil 131A arranged coaxially with the excitation coil 131B. Therefore, when there is no conductor in the vicinity of the excitation coil 131B and the detection coil 131A, the detection coil 131A outputs only an AC signal having a frequency f and a constant amplitude.

  On the other hand, when the excitation coil 131B faces the identification plate 120, an alternating magnetic field having a frequency f generated from the excitation coil 131B is applied to the identification plate 120. Thereby, an eddy current is generated in the identification plate 120 and an eddy current magnetic field is generated from the identification plate 120. Therefore, the detection coil 131A outputs a signal obtained by combining the alternating magnetic field component from the excitation coil 131B and the eddy current magnetic field component from the identification plate 120.

  In addition, in the landing control of the car 40 on a certain floor, it is desirable to consider the door zone and the relevel zone. That is, it is desirable to identify whether the sensor 30 is in the door zone, relevel zone, or outside both zones.

  Therefore, the conductivity σ and the plate thickness d of the hole-free portion 121 of the identification plate 120 are adjusted so as to be the optimal conductor conductivity x plate thickness σ · d indicated by B on the horizontal axis in FIGS. 3A and 3B. Is done. Further, the hole diameter and the hole interval of the hole portion 122 of the identification plate 120 are denoted by the horizontal axis in FIGS. 3A and 3B on the assumption that the conductivity σ and the plate thickness d adjusted in the holeless portion 121 are provided. It is adjusted so as to have an optimum hole occupation ratio p indicated by A.

  As shown in FIG. 2A, the holeless portion 121 is positioned in a region where a relevel zone is to be detected, and the hole portion 122 is positioned in a region where a door zone other than the relevel zone is to be detected. For example, when the frequency f of the AC power supply 132 is 100 kHz, the holeless portion 121 is made of an aluminum alloy (A5052) having a plate thickness of 1.5 mm, and the holed portion 122 is made of a perforated aluminum alloy (A5052) having a plate thickness of 1.5 mm. ) (Hole occupancy 90%), the optimal conductivity of the identification plate 120 × plate thickness σ · d and hole occupancy p can be realized.

  As described above, the larger the plate thickness and conductivity of the identification plate 120, the larger the amplitude value and phase of the eddy current magnetic field. Therefore, instead of increasing the thickness of the conductor, the thickness of the identification plate 120 can be made constant or smaller by changing the metal type of the conductor, that is, using a metal type having a different conductivity. In this case, cost reduction and weight reduction can be achieved, and the installation property of the identification plate 120 can be improved.

Next, the operation of the car position detection apparatus 101 will be described with reference to FIGS. First, FIG. 4 is a diagram illustrating an example of a positional relationship between the sensor and the identification plate at each time when the sensor moves in FIG. 2A. In FIG. 4, the sensor 130 is assumed to move in a direction (+ X direction) from outside the range of the identification plate 120 toward the identification plate 120.
The detection coil 131A and the excitation coil 131B have no conductor (t0 to t1), a holed part 121 (t1 to t2), a holeless part 122 (t2 to t3), a holed part 121 (t3 to t4), and no conductor ( It moves in the order of t4 to t5) and faces the holeless portion 121 or the hole portion 122 of the identification plate 120.

  FIG. 5 is a graph showing an example of the output waveform of the detection coil and the output waveform of the signal processing circuit over time shown in FIG. The horizontal axis of the graph of FIG. 5 is time, and the vertical axis is the excitation current, the output V1 of the AC magnetic field component removal circuit 133, the output V2 of the amplitude value detection circuit 135, and the output V3 of the phase difference detection circuit 134. FIG. 6 shows an example of the relationship between the position of the sensor with respect to the identification plate and the output signals of the holes in the conductor, the phase difference detection circuit, the amplitude value detection circuit, and the comparator in the sensor movement shown in FIG. It is explanatory drawing which shows.

  As apparent from FIG. 5, the values of the outputs V2 and V3 increase or decrease from time t1 to time t4. In FIG. 6, threshold values T1 and T2 are reference voltage values for operating the comparators 136 and 137, respectively. By appropriately setting these values T1 and T2, signals V4 and V5 of High (1) and Low (0) corresponding to the inside of the door zone, the relevel zone, or outside these zones are output from the sensor 130, Sent to the elevator controller. For example, a high (1) signal V4 corresponding to the door zone is transmitted as a door opening / closing preparation signal, and a high (1) signal V5 corresponding to the relevel zone is transmitted as a door opening / closing permission signal.

Here, a method of setting the threshold values T1 and T2 will be described with reference to FIG. FIG. 7 is a graph showing an example of the relationship between the gap between the sensor and the identification plate and the amplitude and phase of the eddy current magnetic field.
In general, since the elevator car 40 is suspended along a rail in the hoistway 50, the elevator car 40 swings within a certain range in a direction substantially perpendicular to the elevator ascending / descending direction. At this time, the gap between the identification plate 120 and the sensor 130 varies. In FIG. 7, the gap at the center position of the fluctuation is L, and the fluctuation width is ΔL. The gap L coincides with the closest distance between the detection coil 131A or the excitation coil 131B and the identification plate 120 described above.

  When the gap increases, the distance between the identification plate 120 and the detection coil 131A increases, and the eddy current magnetic field detected by the detection coil 131A decreases. Therefore, the amplitude of the eddy current magnetic field when the gap increases decreases monotonously as shown in FIG. On the other hand, the magnetic field detected by the detection coil 131 </ b> A is a combined magnetic field of eddy current magnetic fields from the holeless part 121 and the holed part 122. Therefore, if the thickness of the identification plate 120 is sufficiently small with respect to the size of the gap, even if the size of the gap varies as shown in FIG. 7, the phase of the eddy current magnetic field hardly varies.

  Therefore, the threshold value T1 of the comparator 136 that determines the door zone may be set such that the amplitude of the eddy current magnetic field when the gap increases is equal to or greater than the threshold value, for example, a value indicated by a dotted line in FIG.

Next, since the phase difference of the eddy current itself does not change even when the gap is changed, the threshold value T2 of the comparator 137 for determining the relevel zone is set as shown in FIG. 122 (reference A).
In the first embodiment, as shown in FIG. 2, the holeless portion 121 is used for detection of the relevel zone, but the holeless portion 121 and the holed portion 122 are replaced to relevel the holed portion 121. It may be used for zone detection. The same applies to other embodiments.

  As described above, according to the car position detection device 101, the output of the detection coil 131A is extracted as phase and phase information by the signal processing unit, thereby determining whether the position of the car 40 is within the door zone. Whether it is within a zone or outside both zones can be detected independently. Further, by dividing the detection signal from the detection coil 131A by a plurality of threshold values, it is possible to make the detection signal less susceptible to fluctuations, thereby realizing a device with high detection accuracy.

  Further, a single detection coil 131A is sufficient for detecting the identification plate 120. Further, the identification plate 120 can be manufactured with one member by simultaneously performing the punching process when the die is cut from one plate member. As a result, the car position detection apparatus 101 can be provided at a low cost.

(Modification)
Hereinafter, a modified example of the car position detection apparatus according to the first embodiment will be described with reference to FIGS. 8A to 12.
In the first modification, as shown in FIG. 8A, a high magnetic permeability rod-shaped magnetic core 131D is inserted into the coils of the detection coil 131A and the excitation coil 131B. As a result, the AC magnetic field and the detection magnetic field from the exciting coil 131B are enhanced. Alternatively, as shown in FIG. 8B, a needle-like magnetic core 131E with sharp ends may be inserted into the detection coil 131A and the excitation coil 131B. Thereby, the directivity of AC magnetic field, position detection accuracy, etc. can be improved.

  In the second modification, as shown in FIG. 9, a configuration is adopted in which the detection coil 131 </ b> A and the excitation coil 131 </ b> B sandwich the identification plate 120 from the left and right directions intersecting or orthogonal to the elevator ascending / descending direction. Thus, the detection coil 131A and the excitation coil 131B are not necessarily wound around the same coil bobbin.

  In the third modified example, as shown in FIGS. 10 and 11, an alternating magnetic field can be obtained by making the detection coil 131A a differential output or by arranging the detection coil 131A and the excitation coil 131B to intersect. The AC magnetic field component can be removed from the output voltage of the detection coil 131A without using the component removal circuit 133. As a result, the apparatus can be provided at a lower cost. Hereinafter, each configuration will be described.

  In the sensor 130-2 shown in FIG. 10, two detection coils 131A are provided, and each detection coil 131A sandwiches the excitation coil 131B in a direction orthogonal to the elevator lifting / lowering direction, that is, in the gap direction, and It is arranged at a position equidistant from the exciting coil 131B. Therefore, an alternating magnetic field having the same strength is applied to each detection coil 131A. Here, the gap variation in the phase of the eddy current magnetic field is increased to some extent by increasing the thickness of the identification plate 120 with respect to the dimension of the gap between the identification plate 120 and the detection coil 131A. At this time, if the output of each detection coil 131A is a differential output, the AC magnetic field generated by the excitation coil 131B is the same at the position of each detection coil 131A, but the eddy current magnetic field differs depending on the distance from the identification plate 120. Only the eddy current magnetic field component is output from the detection coil 131A.

  In the sensor 130-3 shown in FIG. 11, the detection coil 131A is arranged in parallel or substantially in parallel with the identification plate 120, and the excitation coil 131B is arranged in a direction orthogonal to the elevator lifting / lowering direction. . An example of the magnetic field lines of the alternating magnetic field and eddy current magnetic field in the detection coil 131A arranged in this way is shown in FIG. The solid line is the magnetic field line of the excitation magnetic field, and the direction thereof is orthogonal to the axial direction of the detection coil 131A. Therefore, the output of the detection coil 131A does not include an AC magnetic field component. Further, the dotted line is a magnetic field line of the eddy current magnetic field, and the direction of the eddy current magnetic field at the position of the detection coil 131A coincides with the axial direction of the detection coil 131A. As described above, since only the eddy current magnetic field is applied to the detection coil 131A, only the eddy current magnetic field component is output from the detection coil 131A.

Embodiment 2. FIG.
FIG. 13 is a block diagram showing a car position detection apparatus according to Embodiment 2 of the present invention.
In the car position detection device 102, as shown in FIG. 13, a detection coil 131A and an excitation coil 131B are arranged so as to sandwich the identification plate 120 in a direction intersecting or orthogonal to the elevator ascending / descending direction. . The sensor 130-4 illustrated in FIG. 13 does not include the AC magnetic field component removal circuit 133. In such a configuration, the detection coil 131A outputs a voltage corresponding to the combined magnetic field of the excitation magnetic field and the eddy current magnetic field. The other configuration is the same as the configuration of FIG. 9 described as a modification of the first embodiment, and a description thereof will be omitted. In the second embodiment, the arrangement of the holeless part 121 and the holed part 122 is opposite to that in the first embodiment. However, the arrangement is not limited to this, and the same arrangement as in the first embodiment may be used.

FIG. 14A and FIG. 14B are graphs showing an example of the relationship between the electrical conductivity of the conductor × the plate thickness and the occupation ratio of the holes, and the amplitude and phase, which are the outputs of the detection coils, respectively. The graphs of FIGS. 14 and 14B correspond to the graphs of FIGS. 3A and 3B, and the reason why the shapes of the two graphs are different will be described.
When conductivity × plate thickness is zero, the phase difference between the eddy current magnetic field and the alternating magnetic field is 90 degrees. As shown in FIG. 3B, when the conductivity × plate thickness is sufficiently large, the phase difference between the eddy current magnetic field and the AC magnetic field is saturated and approaches as much as 180 degrees. Therefore, when the conductivity × plate thickness increases, an eddy current magnetic field having an approximately opposite phase to the alternating magnetic field is applied to the detection coil 131A. Furthermore, as shown in FIG. 3A, the amplitude monotonously increases as the conductivity × plate thickness increases. Therefore, as shown in FIG. 14A, the output (amplitude) of the detection coil 131A decreases as the conductivity × plate thickness increases.

  As shown in FIG. 3B, when conductivity × plate thickness is sufficiently small, the phase difference between the AC magnetic field and the eddy current magnetic field is large, but the amplitude of the eddy current magnetic field is small. Therefore, the phase of the combined magnetic field of the alternating magnetic field and the eddy current magnetic field is considered to be almost the phase of the exciting magnetic field, and the phase difference of the combined magnetic field with respect to the exciting magnetic field, that is, the output (phase) of the detection coil 131A is sufficiently small. On the other hand, when the conductivity × plate thickness is sufficiently large, the AC magnetic field and the eddy current magnetic field are almost opposite in phase, so that the phase difference of the combined magnetic field with respect to the excitation magnetic field becomes small. Therefore, as shown in FIG. 14B, the output (amplitude) of the detection coil 131A becomes maximum when the conductivity × plate thickness has a certain intermediate value. When the conductivity × plate thickness further increases, the phase difference approaches the value when no eddy current magnetic field is generated, that is, the conductivity × plate thickness is zero (or the hole occupation ratio p = 100).

  Therefore, the conductivity σ and the plate thickness d of the hole-free portion 121 of the identification plate 120 are adjusted so as to be the optimal conductor conductivity x plate thickness σ · d indicated by B on the horizontal axis in FIGS. 14A and 14B. Is done. At this time, the position indicated by the symbol A can be a position where the output (phase) of the detection coil 131A is maximized. Further, the hole diameter and the hole interval of the hole portion 122 of the identification plate 120 are denoted by the horizontal axis in FIGS. 14A and 14 on the assumption that the conductivity σ and the plate thickness d adjusted in the holeless portion 121 are provided. It is adjusted so as to have an optimum hole occupation ratio p indicated by A.

  Further, as shown in FIG. 13, the perforated portion 122 is positioned in the region where the relevel zone is to be detected, and the holeless portion 121 is positioned in the region where the door zone excluding the relevel zone is to be detected. For example, when the frequency f of the AC power supply 132 is 100 kHz, the holeless portion 121 is made of an aluminum alloy (A5052) having a plate thickness of 1.5 mm, and the holed portion 122 is made of a perforated aluminum alloy having a plate thickness of 1.5 mm (A5052). By setting the hole occupation ratio to 90%, it is possible to realize the optimal conductivity of the identification plate 120 × plate thickness σ · d and hole occupation ratio p.

The operation of the car position detection apparatus 102 will be described with reference to FIGS. 15 to 17. FIGS. 15 to 17 correspond to FIGS. 4 to 6.
As shown in FIG. 15, the values of the output V2 and the output V3 increase or decrease between times t7 and t10. By appropriately setting these values T1 and T2, signals V4 and V5 of High (1) and Low (0) corresponding to the inside of the door zone, the relevel zone, or outside these zones are output from the sensor 130, Sent to the elevator controller.

Here, a method for setting the threshold values T1 and T2 will be described.
In the second embodiment, as shown in FIG. 13, the detection coil 131 </ b> A and the excitation coil 131 </ b> B are arranged so as to sandwich the identification plate 120. As described above, when the car 40 sways during elevation and the distance between the detection coil 131A and the identification plate 120 increases, the eddy current magnetic field from the identification plate 120 out of the combined magnetic field detected by the detection coil 131A. The rate decreases. On the other hand, since the distance between the exciting coil 131B and the identification plate 120 decreases, the strength of the eddy current magnetic field generated from the identification plate 120 increases. Therefore, even if the car 40 is shaken, the intensity of the eddy current magnetic field applied to the detection coil 131A hardly fluctuates. Therefore, even if the car 40 is shaken, the voltage corresponding to the combined magnetic field of the excitation magnetic field and the eddy current magnetic field output from the detection coil 131A hardly fluctuates.

  Accordingly, in the second embodiment, unlike the first embodiment, it is not necessary to determine the threshold values T1 and T2 in consideration of the fluctuation range ΔL of the gap between the identification plate 120 and the sensor 130. Therefore, the threshold value T1 of the comparator 136 that determines the door zone may be set between the absence of conductor (p = 100) and the perforated portion 122 (reference A) as shown in FIG. 14A. Next, as shown in FIG. 14B, the threshold value T2 of the comparator 137 for determining the relevel zone can be set by setting the threshold value T2 between the holeless portion 121 (reference symbol B) and the perforated portion 122 (reference symbol A). Good.

  As described above, according to the car position detection device 102, the effect exhibited by the car position detection device 101 of the first embodiment described above can be obtained.

  In particular, according to the car position detection device 102, since the AC magnetic field component removal circuit 133 is omitted, the device can be provided at a lower cost. Further, the configuration in which the detection coil 131A and the excitation coil 131B are arranged so as to sandwich the identification plate 120 can suppress the fluctuation of the output signal of the detection coil 131A due to the shaking of the car 40. Thereby, since the position of the car 40 can be detected regardless of the setting of the threshold value, there is an effect that the detection range of the apparatus can be further expanded.

Embodiment 3 FIG.
Next, the car position detection device 103 according to the third embodiment of the present invention will be described with reference to the explanatory diagram of FIG.
The car position detection device 103 has basically the same configuration as that of the car position detection device 102 of the second embodiment, but differs from the car position detection device 102 in that the comparator 137 has two threshold values. This difference will be described in detail below.

  When the sensor 130 moves in the direction (X direction) from outside the range of the identification plate 120 toward the identification plate 120, the output V3 of the phase difference detection circuit 134 and the output V2 of the amplitude value detection circuit 135 are as shown in FIG. To change. At this time, the comparator 137 having two threshold values T3 and T4 outputs a voltage V5 divided into three output values by the two threshold values T3 and T4 with respect to the output V3 of the phase difference detection circuit 134. That is, a signal V5 of High (2), High (1), and Low (0) corresponding to the inside of the door zone, the relevel zone, or outside these zones is output from the sensor 130. At this time, the signal V4 of High (1) and Low (0) corresponding to the inside or outside of the door zone is also output from the sensor 130.

  As described above, according to the car position detection device 103, the position of the car 40 is in the door zone, the relevel zone, or both zones using only the output of the phase difference detection circuit 134. Whether it is outside can be detected.

  Further, by combining the signal V5 and the signal V4 from the comparator 136 to which the output V2 of the amplitude value detection circuit 135 is supplied, it becomes possible to further improve the detection accuracy of the car position.

  In the third embodiment, the phase comparator 137 is configured to have two thresholds, but of course, the amplitude comparator 136 may be configured to have two thresholds. Further, as in the third embodiment, it is obvious that a configuration in which a plurality of threshold values are provided in one comparator may be applied to other embodiments. For example, when applied to the configuration of the first embodiment, a change in the output V2 of the amplitude value detection circuit 135 due to the shaking of the car 40 may be taken into consideration. That is, two threshold values can be set for the output V3 of the phase difference detection circuit 134 that has a small fluctuation with respect to the fluctuation.

Embodiment 4 FIG.
FIG. 19 is a block diagram showing a car position detection apparatus according to Embodiment 4 of the present invention.
In the car position detection device 104, the configuration of the identification plate 120 is changed, and the comparator 137 is changed to the offset correction circuit 138. Other configurations are the same as those of the car position detection device 101 of the first embodiment, and the description thereof is omitted. Hereinafter, the differences will be described in detail.

  As shown in FIG. 19, the identification plate 120-2 includes two perforated portions 122-1 and 122-2. The hole portion 122-1 is the same as that in the first embodiment. The holes formed in the hole portion 122-2 are formed such that the occupation ratio gradually changes in the movement direction (X direction) of the sensor 130, that is, the hole density gradually changes.

  When the sensor 130-5 moves in the X direction from the outside of the range of the identification plate 120-2 toward the identification plate 120-2 with respect to such an identification plate 120-2, the output V3 of the phase difference detection circuit 134. As shown in FIG. 20, the output V2 of the amplitude value detection circuit 135 is an output value corresponding to the occupancy rate of the hole of the conductor 122-2 at the location where the detection coil 131A and the excitation coil 131B face each other. That is, the output V3 and the output V2 become larger as the hole occupation ratio of the conductor 122-2 is smaller. By utilizing this characteristic, the absolute position of the sensor 130-5 in the identification plate 120-2 can be detected.

  The offset correction circuit 138 to which the output V3 of the phase difference detection circuit 134 is supplied is a circuit that performs zero point correction and the like, and is configured by an operational amplifier, for example. As shown in FIG. 20, the offset correction circuit 138 changes the voltage V5 corresponding to the absolute position in the relevel zone from Low (0) to High (1) only in the relevel zone corresponding to the region of the conductor 122-2. ) Is output steplessly during

  Therefore, according to the car position detection apparatus 104, the effect which the car position detection apparatus 101 of Embodiment 1 mentioned above show | plays can be acquired. Further, in the relevel zone, not only the detection of the relevel zone but also the absolute position of the car 40 in the relevel zone can be detected.

  In the fourth embodiment, a hole is formed over the entire identification plate 120-2. However, as in the first to third embodiments, in the identification plate having a holeless portion and a hole portion, A configuration in which holes are formed so that the occupation ratio gradually changes in the vacant portion may be employed.

(Modification)
21A and 21B are diagrams showing a modification of the identification plate provided in the car position detection device shown in FIG.
In the modification shown in FIG. 21A, the hole occupation ratio is gradually changed over the entire identification plate 120-3. With this configuration, the absolute position of the car 40 in each zone can be detected in the entire door zone including the relevel zone. Moreover, in the modification shown to FIG. 21B, it forms so that the occupation rate of a hole may change to step shape over the whole identification board 120-4. With this configuration, the door zone can be detected as a plurality of zones.

Embodiment 5. FIG.
FIG. 24 is a block diagram showing a car position detection apparatus according to Embodiment 5 of the present invention.
In the car position detection device 105, the configuration of the signal processing unit is changed, and the phase difference detection circuit 134 and the amplitude value detection circuit 135 are changed to the IQ detection circuit 139. Other configurations are the same as those of the car position detection device 102 according to the second embodiment, and a description thereof will be omitted. Hereinafter, the differences will be described in detail.

  The IQ detection circuit 139 is connected to the AC power source 132, and performs IQ detection (orthogonal detection) on the signal from the detection coil 131A using the signal from the AC power source 132 as a reference signal. V2 and V3 output from the IQ detection circuit 139 correspond to the real component and the imaginary component of the output voltage of the detection coil 131A, respectively. FIGS. 25A and 25B are graphs showing the real component and the imaginary component of the output voltage of the detection coil 131A in FIGS. 14A and 14B, and were obtained from the amplitude and phase of the detection coil 131A in FIGS. 14A and 14B, respectively. This corresponds to amplitude × cos (phase) and amplitude × sin (phase).

  It can be seen that the graphs of FIGS. 25A and 25B show the same behavior as FIGS. 14A and 14B, respectively. Therefore, even if the amplitude and phase of the output voltage of the detection coil 131A are replaced with real components and imaginary components in the second embodiment, the same effect as in the second embodiment can be obtained.

  In the fifth embodiment, the configuration in which the IQ detection circuit 139 is used instead of the phase difference detection circuit 134 and the amplitude value detection circuit 135 in the sensor 130-4 in FIG. 13 has been described. Similarly, the sensor 130 in FIG. The IQ detection circuit 139 may be used at -5.

Embodiment 6 FIG.
FIG. 26 is a configuration diagram illustrating an identification plate provided in the car position detection device according to the sixth embodiment of the present invention.
The sixth embodiment is different from the first embodiment only in the configuration of the identification plate. Other configurations are the same, and the description is omitted. Hereinafter, the differences will be described in detail.

  In the identification plate 120-5, the arrangement of the holeless part 121 and the holed part 122 is opposite to that of the first embodiment, that is, the arrangement is the same as that of the second embodiment. A plurality of elongated holes extending in the X direction are formed in the hole portion 122 of the identification plate 120-5. Hereinafter, this elongated hole is referred to as a slot portion 123. Although the slot portion 123 is illustrated in an oval shape, it may be oval. The length of the slot portion 123 in the X direction is sufficiently larger than the distance L. Further, the slot portions 123 are formed with a constant slot interval m in the Y direction. The slot portion 123 is an example of an anisotropically distributed hole having an anisotropic shape in the X direction and the Y direction.

  Next, changes in the shape of the eddy current generated on the identification plate as the car is raised and lowered will be described with reference to FIG.

FIG. 27A corresponds to the identification plate 120 of FIG. 2B.
When an alternating magnetic field is applied to the holeless portion 121 of the identification plate 120 by the exciting coil 131B, an eddy current having a shape close to a perfect circle flows as described above. The conductor portion through which the eddy current flows can be regarded as a virtual coil portion 124 having an inductance along the shape of the eddy current distribution. When the car 40 rises, the eddy current moves in the direction of the arrow. When the hole diameter of the hole formed in the identification plate 120 is sufficiently small and each hole is formed isotropically, even if the car 40 is lifted and an alternating magnetic field is applied to the hole part 122, the vortex The shape of the current remains close to a perfect circle. Therefore, the inductance of the identification plate 120 with respect to the generated eddy current hardly changes as the car 40 moves up and down.

FIG. 27B corresponds to the identification plate 120-5 in FIG.
When an alternating magnetic field is applied to the holeless portion 121 of the identification plate 120-5 by the exciting coil 131B, an eddy current having a shape close to a perfect circle flows as in FIG. When the car 40 rises, the eddy current moves in the direction of the arrow. In the identification plate 120-5, when the car 40 is raised and an AC magnetic field is applied to the hole portion 122, the eddy current is not a perfect circle, but has a shape close to an oval or an ellipse between the slot portions 123. Become. Therefore, the inductance of the identification plate 120 with respect to the generated eddy current changes as the car 40 moves up and down.

  FIG. 35 is a graph showing changes in inductance when the aspect ratio (the ratio of the lengths in the X direction and the Y direction) of the virtual coil portion is changed. From FIG. 35, it can be seen that increasing the aspect ratio from 1 to 10 increases the inductance approximately 44 times.

28A and 28B are graphs showing an example of the relationship between the inductance and slot interval of eddy current, the magnitude (amplitude) of the eddy current magnetic field, and the phase.
Comparing FIG. 28A, FIG. 28B with FIG. 3A, FIG. 3B, the amplitude and phase of the eddy current magnetic field are different when the inductance is increased (slot interval m is decreased) and when the hole occupancy p is decreased. It turns out that each shows the same behavior. Therefore, the same effect as that of the first embodiment can be obtained by adjusting the identification plate 120-5 as follows.

  That is, as in the first embodiment, first, the conductivity σ and the plate thickness d of the hole-free portion 121 of the identification plate 120-5 are represented by the optimal conductor conductivity x indicated by the symbol A on the horizontal axis of FIGS. 28A and 28B. Adjustment is made so that the plate thickness σ · d is obtained. Next, assuming that the hole diameter and the hole interval of the perforated portion 122 have the conductivity σ and the plate thickness d adjusted by the holeless portion 121 of the identification plate 120-5, FIG. 28A and FIG. The axis is adjusted to have an optimum slot interval m indicated by B. That is, a hole is formed in the hole portion 122 of the identification plate 120-5 so that the conductor has different conductances in the X direction and the Y direction.

(Modification)
FIG. 29A to FIG. 29C are diagrams showing a modification of the identification plate shown in FIG.
In the identification plate 120-6 shown in FIG. 29A, the slot portion 123 extends in the Y direction. According to this configuration, a sufficiently large eddy current can be generated even when the sensor is located in the vicinity of the end of the hole portion 122 in the X direction. Therefore, changes in the output waveform of the detection coil 131A and the output waveform of the signal processing circuit in the vicinity of the end portion in the X direction of the perforated portion 122 can be abruptly advanced, and the detection position accuracy of the relevel zone and the door zone is improved. be able to.

  In the identification plate 120-7 shown in FIG. 29B, the slot portion 123 extends in a direction inclined from the X direction toward the Y direction. In the identification plate 120-8 shown in FIG. 29C, the slot portion 123 extends in a zigzag shape. With these configurations, it is possible to maintain the aspect ratio of the virtual coil portion 124 in which the eddy current is formed in the hole portion 122, that is, the inductance, at a large value while maintaining the slot interval m at a certain size or more. The inclination angle of the slot 123 in FIG. 29B and the zigzag shape in the modification of FIG. 29C are arbitrary.

FIG. 30 is a diagram showing a second modification of the identification plate shown in FIG.
In the identification plate 120-9 shown in FIG. 30, a plurality of small-diameter holes having functions similar to those of the slot portion 123 are formed. Hereinafter, the small-diameter hole formed in the identification plate 120-9 is referred to as a pinhole portion 125.

  The diameter of the pinhole portion 125 is sufficiently smaller than the distance L. The pinhole portions 125 are formed at a constant interval m in the Y direction, and are formed at a constant interval sufficiently smaller than the interval m in the X direction. The interval m corresponds to the slot interval. Thus, in the identification plate 120-9, the holes are anisotropically distributed in the X direction and the Y direction.

  With this configuration, when an alternating magnetic field is applied to the hole portion 122, the eddy current has a shape close to an oval or an ellipse extending in the X direction, as in the configuration of FIG. 30A. In the pinhole portion 125, unlike the slot portion 123, there is an interval in the X direction, so that some eddy current flows through the interval in the Y direction. However, when these are viewed macroscopically, the conductance in the Y direction becomes smaller than the X direction, and the shape of the eddy current is limited. Therefore, it is possible to obtain the same effect as that of the configuration of FIG. 26 while suppressing a decrease in strength caused by making an oval hole such as the slot portion 123 in the identification plate.

  29A to 29C exist for the slot 123 of FIG. 26, and further modifications corresponding to FIGS. 29A to 29C for the pinhole portion 125 of FIG. 30 are also envisaged.

Embodiment 7 FIG.
FIG. 31 is a configuration diagram illustrating an identification plate provided in the car position detection device according to the seventh embodiment of the present invention.
The seventh embodiment is the same as the second embodiment except for the configuration of the identification plate. Regarding the configuration of the identification plate, first, the arrangement of the holeless portion 121 and the holed portion 122 is opposite to that of the second embodiment, that is, the arrangement of the first embodiment is the same. FIGS. 31 to 34 correspond to FIGS. 26 and 28 to 30, respectively, and the identification plates 120-10 to 120-14 correspond to 120-5 to 120-9. The relationship between the first embodiment and the second embodiment corresponds to the relationship between the sixth embodiment and the seventh embodiment. Therefore, detailed description of each figure is omitted.

  32A and 32B are graphs showing an example of the relationship between the inductance and slot interval of eddy current, the magnitude (amplitude) of the eddy current magnetic field, and the phase. As in the second embodiment, the conductivity σ and the plate thickness d of the hole-free portion 121 of the identification plate 120-10 are expressed by the optimal conductor conductivity x plate thickness σ indicated by the symbol A on the horizontal axis of FIGS. 32A and 32B.・ Adjust so that it becomes d. Next, assuming that the hole diameter and the hole interval of the hole portion 122 have the conductivity σ and the plate thickness d adjusted by the holeless portion 121 of the identification plate 120-10, the horizontal direction of FIGS. 32A and 32B. The axis is adjusted to have an optimum slot interval m indicated by B.

  The seventh embodiment can be suitably realized even in the configuration of the third embodiment.

  As described above, the present invention forms a plurality of regions (first region, second region, etc.) having different conductances and / or inductances with respect to generated eddy currents in the identification conductor (identification plate). The elevator car position is detected. As long as they do not depart from the gist of the present invention, the embodiments may be combined or various changes and improvements may be added.

  40 car, 101-104 car position detection device, 120, 120-2 to 120-14 identification plate, 121 holeless portion, 122 hole portion, 123 slot portion, 124 virtual coil portion, 125 pinhole portion, 130, 130-2 to 130-6 sensor, 131A detection coil, 131B excitation coil, 132 AC power supply, 133 AC magnetic field component removal circuit, 134 phase difference detection circuit, 135 amplitude value detection circuit, 136,137 comparator, 138 offset correction circuit, 139 IQ detection circuit.

Claims (13)

A car position detection device that detects a car position of an elevator by detecting a conductor for identification,
The identification conductor includes a first region having a plurality of holes formed to have a first conductance, and a second region having a second conductance different from the first conductance,
The sensor includes a magnetic field generator that generates a magnetic field for the identification conductor, two magnetic field detectors arranged in pairs with the magnetic field generator, and a signal electrically connected to the magnetic field detector. A processing unit,
The magnetic field detector detects an eddy current magnetic field generated from the identification conductor by a magnetic field from the magnetic field generator,
The signal processing unit identifies the positional relationship between the identification conductor and the sensor based on the amplitude and / or phase information of the eddy current magnetic field obtained from the output of the magnetic field detector,
The magnetic field generator is arranged in a direction perpendicular to the raising / lowering direction of the car,
The cage is characterized in that the two magnetic field detectors are disposed so as to sandwich the magnetic field generator in a direction perpendicular to the detection surface of the identification conductor and at an equal distance from the magnetic field generator. Position detection device. A car position detection device that detects a car position of an elevator by detecting a conductor for identification,
The identification conductor includes a first region having a plurality of holes formed to have a first conductance, and a second region having a second conductance different from the first conductance,
The sensor includes a magnetic field generator that generates a magnetic field for the identification conductor, a magnetic field detector disposed in a pair with the magnetic field generator, and a signal processing unit electrically connected to the magnetic field detector. And
The magnetic field detector detects an eddy current magnetic field generated from the identification conductor by a magnetic field from the magnetic field generator,
The signal processing unit identifies the positional relationship between the identification conductor and the sensor based on the amplitude and / or phase information of the eddy current magnetic field obtained from the output of the magnetic field detector,
The magnetic field generator has a coil bobbin disposed along a direction perpendicular to the raising / lowering direction of the car , and a coil wound around the coil bobbin ,
2. The car position detecting device according to claim 1, wherein the magnetic field detector includes a coil bobbin arranged in parallel with the identification conductor and along the raising / lowering direction of the car , and a coil wound around the coil bobbin .   The plurality of holes have an isotropic shape in an ascending / descending direction of the car and a direction perpendicular to the ascending / descending direction and / or are isotropically distributed. Or the car position detecting device according to 2;   The said several hole has a shape and / or arrangement | positioning that the said 2nd area | region has a different inductance from the said 1st area | region with respect to the eddy current to generate | occur | produce, The 1st or 2 characterized by the above-mentioned. Car position detector.   The plurality of holes have an anisotropic shape and / or are anisotropically distributed in an ascending / descending direction of the car and a direction perpendicular to the ascending / descending direction. The car position detection device described in 1.   The magnetic field generator and the magnetic field detector are configured such that when the car position fluctuates in a direction perpendicular to the ascending / descending direction, and the magnetic field received by the identification conductor from the magnetic field generator increases or decreases, The car position detecting device according to any one of claims 1 to 5, wherein the car position detecting device is arranged so that an eddy current magnetic field detected by the detector decreases or increases. L is the closest distance between the magnetic field generator and the identification conductor, or the closest distance between the magnetic field detector and the identification conductor.
Wherein the plurality of holes is characterized in that it is formed by two or more density per area defined by L ^2, the car position detecting apparatus according to any one of claims 1-6.   The car position detecting device according to any one of claims 1 to 7, wherein holes are formed in the second region at a density different from that of the first region.   The area of the plurality of holes is smaller than the area of a circle whose diameter is the closest distance between the magnetic field generator or the magnetic field detector and the identification conductor. The car position detecting device according to item 1. The information on the amplitude and / or phase of the eddy current magnetic field is a signal corresponding to the amplitude of the eddy current magnetic field and / or a signal corresponding to the phase difference between the eddy current magnetic field and the magnetic field from the magnetic field generator. Yes,
The signal processing unit includes a comparison unit that compares the magnitude of the input signal with a predetermined threshold,
The car position detection according to any one of claims 1 to 9, wherein the comparison unit generates a signal indicating a positional relationship between the identification conductor and the sensor in accordance with a comparison result. apparatus. The information on the amplitude and / or phase of the eddy current magnetic field is a signal corresponding to the real component and / or imaginary component of the eddy current magnetic field obtained from the output of the magnetic field detector,
The signal processing unit includes a comparison unit that compares the magnitude of the input signal with a predetermined threshold,
The car position detection according to any one of claims 1 to 9, wherein the comparison unit generates a signal indicating a positional relationship between the identification conductor and the sensor in accordance with a comparison result. apparatus.   The car position detecting device according to any one of claims 1 to 11, wherein a shape of the plurality of holes is circular or polygonal.   The plurality of holes are formed at regular intervals from each other in an ascending / descending direction of the car and / or a direction perpendicular to the ascending / descending direction. The car position detection device described in 1.

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