JP2002241062A - Elevator controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator controller capable of preventing the improper operation of an elevator cage by the malfunction of a positioning device or the like and correcting the dislocation of the elevator cage caused by the elongation of an elevator rope with the lapse of time, when a constitution is simplified by applying the positioning device. SOLUTION: This elevator controller comprises a first encoder mounted on an elevator motor, a second encoder mounted on the elevator motor, a first control means for outputting a stop signal on the basis of a signal from the first encoder and a signal from the second encoder, and a second control means for outputting a stop signal on the basis of the signals from the first encoder or the second encoder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator control device, and more particularly to a control device for controlling an elevator motor by a position control device, which prevents an improper operation of an elevator box due to a malfunction or the like. The present invention relates to a device devised so as to be able to correct a position shift caused by elongation of an elevator rope due to aging.

[0002]

2. Description of the Related Art Conventional elevator control devices are, for example,
The configuration is as shown in FIG. First, there is a traction sheave 201, and this traction sheave 201
Is wound with an elevator rope 203. An elevator box 205 is provided at one end of the elevator rope 203.
And a counter weight 207 is connected to the other end. Traction sheave 2 above
01 is rotated in an appropriate direction by an elevator motor 209, whereby the elevator rope 203 is wound and unwound, and the elevator box 205 is moved up and down.

Next, a configuration for controlling the elevator motor 209 will be described. First, an elevator motor driving device 211 is provided. An absolute encoder 213 is attached to the elevator motor 209 so as to detect a position.
The absolute encoder 213 outputs a pole position / velocity feedback signal S 213 and inputs it to the elevator motor driving device 211.

An acceleration / deceleration start switch 215 is provided at a predetermined position of each floor on the hoistway of the elevator box 205.
Positioning complete switch 217, acceleration / deceleration start switch 21
9 are arranged respectively. Also, elevator box 205
A switch dog 221 is attached to the side. Acceleration / deceleration start switch 215, positioning completion switch 2
17, the signal S from the acceleration / deceleration start switch 219
215, S217, and S219 are output and input to the elevator motor driving device 211. or,
The speed command signal S2 is supplied to the elevator motor driving device 211.
23 is input.

[0005] In the above configuration, the elevator motor driving device 211 receives the speed command signal S223, the pole position / speed feedback signal S213 from the absolute encoder 213, the acceleration / deceleration start switch 215, the positioning completion switch 217, and the signals from the acceleration / deceleration start switch 219. S
The control signal S211 is output to the elevator motor 209 based on 215, S217, and S219 to control it.

For example, when the elevator box 205 is lowered to an arbitrary floor, the switch dog 221 of the elevator box 205 passes through the acceleration / deceleration start switch 215, and the acceleration / deceleration start switch 215 starts acceleration / deceleration. The signal S215 is output. Based on this, the descending speed of the elevator box 205 is reduced. Then, when the switch dog 221 of the elevator box 205 reaches the positioning completion switch 217, the positioning completion switch S217 outputs a positioning completion signal S217. Based on this, the lowering operation of the elevator box 205 is stopped.

[0007]

According to the above-mentioned conventional configuration, there are the following problems. In other words, in the conventional case, a large number of switches such as an acceleration / deceleration start switch 215, a positioning completion switch 217, and an acceleration / deceleration start switch 219 are required, and there is a problem that the configuration becomes complicated. Therefore, it has been considered to simplify the configuration, for example, by using a so-called position control device to eliminate many switches. Here, the position control device means a device that automatically performs acceleration and deceleration based on preset numerical data.

However, the use of such a position control device has the following problems. First, it is necessary to prevent an improper operation of the elevator box due to a malfunction of the position control device. Next, there is a problem of elongation of the elevator rope 203 due to aging. That is, when the elevator rope 203 is elongated, there is a problem that a displacement occurs due to the extension.

The present invention has been made on the basis of such a point. An object of the present invention is to simplify the structure by adopting a position control device, and to improve the structure of the elevator box due to a malfunction of the positioning device. An object of the present invention is to provide an elevator control device capable of preventing improper operation from occurring and correcting a position shift caused by elongation of the elevator rope due to aging.

[0010]

To achieve the above object, an elevator control apparatus according to a first aspect of the present invention includes a first encoder attached to an elevator motor, a second encoder attached to the elevator motor,
First control means for outputting a stop signal based on a difference between a signal from the first encoder and a signal from the second encoder; and outputting a stop signal based on a signal from the first or second encoder. And a second control means. According to a second aspect of the present invention, in the elevator control apparatus according to the first aspect, the first control means calculates a difference between a signal from the first encoder and a signal from the second encoder, and calculates the difference. Is to output a stop signal when exceeds a preset value.
An elevator control device according to a third aspect of the present invention is the elevator control device according to the first aspect, wherein the second control means determines whether a signal from the first encoder or the second encoder exceeds a preset value. A stop signal is output. Claim 4
The elevator control apparatus according to any one of claims 1 to 3, wherein the first encoder is an absolute encoder, and the second encoder is an absolute encoder.
The encoder is characterized in that it is an incremental encoder. An elevator control device according to a fifth aspect includes an elevator rope elongation measuring means for measuring elongation of an elevator rope, and a correcting means for correcting a position command signal based on a signal from the elevator rope elongation measuring means. It is characterized by having done. An elevator control device according to claim 6 is the elevator control device according to any one of claims 1 to 4, wherein the elevator rope elongation measuring means for measuring the elongation of the elevator rope and the elevator rope elongation measuring means. And a correcting means for correcting the position command signal based on the above signal.

That is, in the case of the elevator control device according to the present invention, the first encoder and the second encoder are attached to the elevator motor. Then, the first control means outputs a stop signal based on the difference between the signal from the first encoder and the signal from the second encoder. or,
The second control means outputs a stop signal based on a signal from the first encoder or the second encoder. That is, a double protection device is provided by the first control means and the second control means. At this time, the first control means calculates a difference between a signal from the first encoder and a signal from the second encoder, and outputs a stop signal when the difference exceeds a preset value. It is possible to do. The second control means may output a stop signal when a signal from the first encoder or the second encoder exceeds a preset value. It is also conceivable that the first encoder is an absolute encoder and the second encoder is an incremental encoder. In addition, a configuration including an elevator rope elongation measuring means for measuring the elongation of the elevator rope, and a correcting means for correcting the position command signal based on the signal from the elevator rope elongation measuring means can be considered. Thereby, the displacement caused by the elongation of the elevator rope can be eliminated.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing a configuration of an elevator control device according to the present embodiment. First, a traction sheave 1 is provided, and an elevator rope 3 is wound around the traction sheave 1. An elevator box 5 is connected to one end of the elevator rope 3 and a counterweight 7 is connected to the other end. The traction sheep 1 is driven to rotate by an elevator motor 9. The traction sheave 1 is rotated in an appropriate direction by the elevator motor 9, thereby raising and lowering the elevator box 5 via the elevator rope 3.

The elevator motor 9 is driven by an elevator motor driving device 11, and the elevator motor driving device 11 is configured to be controlled by a position control device 13. The position control device 13 performs acceleration / deceleration control based on preset numerical data.

The elevator motor 9 is provided with an absolute encoder 15 as a first encoder and an incremental encoder 17 as a second encoder. The position detection signal S15 from the absolute encoder 15 The data is input to the arithmetic unit 19 and the protection error arithmetic unit 21. The position detection signal S15 is also input to the elevator motor driving device 11.
The position detection signal S17 from the incremental encoder 17 is input to the protection error calculator 21 and the frequency-voltage converter 23.

The position control device 13 includes a speed calculator 25.
Is provided. A comparator 27 is provided on the output side of the frequency-voltage converter 23. Also, elevator box 5
Position complete switch 2 at a predetermined position on each floor of the hoistway
9 are installed. On the other hand, a positioning completion switch dog 31 is attached to the elevator box 5 side.
The positioning completion switch 29 may be attached to the elevator box 5 side, and the positioning completion switch dog 31 may be attached to a predetermined position on each floor. In that case, only one positioning completion switch 29 is required.

In the above configuration, first, in a normal operation, the position command signal S33 is input to the position error calculator 19 of the position control device 13. On the other hand, the position detection signal S15 from the absolute encoder 15 is also input to the position error calculator 19. The position error calculator 19 outputs a calculation signal S19 to the speed calculator 25 based on those signals. The speed calculator 25 outputs a speed command signal S25 to the elevator driving device 11 based on the calculation signal S19. The elevator drive unit 11 receives the input speed command signal S
25 to the elevator motor 9 based on the drive control signal S1.
Outputs 1. As a result, the elevator motor 9 is driven to move the elevator box 5 up and down to the desired floor via the traction sheave 1 and the elevator rope 3, and then stop. The fact that the elevator box 5 has stopped at the predetermined floor is confirmed by outputting the positioning completion switch S29 from the positioning completion switch 29 to the position control device 13.

Next, the operation of the protection device will be described with reference to the flowcharts of FIGS. In step S1, the software protection process starts. First, the position detection signal S15 from the absolute encoder 15 is input to the protection error calculator 21 (step S2). Next, the process proceeds to step S3, where the position detection signal S17 from the incremental encoder 17 is input to the protection error calculator 21. Next, the protection error calculator 21 calculates the difference between the position detection signal S15 and the position detection signal S17 (step S4).

Next, the process proceeds to step S5, where the calculated difference is compared with a preset set value (signal S35). If the difference exceeds the set value in this comparison, the process moves to step S6. In step S6, the stop command signal S21 is output from the protection error calculator 21.
The stop command signal S21 is output to the speed calculator 25 and simultaneously to the elevator motor drive device 11, as shown in FIG. As a result, the elevator motor 9 stops (step S
7). Further, the process proceeds to step S8 to stop the alarm, and proceeds to step S9 to complete the operation.

On the other hand, if it is determined in step S5 that the difference does not exceed the set value, the flow shifts to step S8 where normal operation is executed and the operation is completed (step S1).
1). The operation up to this is the function of the first stage as a protection device.

Next, the function of the second stage as a protection device will be described. As shown in FIG. 3, the hardware protection process starts in step S21. Then, in step S22, the position detection signal S17 from the incremental encoder 17 is output to the frequency / voltage converter 23, where it is D / A converted, and the signal S23 is output to the comparator 27. Next, the process proceeds to step S23, where the input signal S23 and a preset value (signal S37) are set.
Is compared.

As a result of the comparison, if the signal S23 exceeds a preset value (signal S37), the process proceeds to step S24.
Then, the stop command signal S27 is output to the elevator motor drive device 11. As a result, the elevator motor 9 stops (step S25). or,
The process proceeds to step S26 to stop the alarm, and proceeds to step S27 to complete the operation.

On the other hand, in step S23,
If the signal S23 does not exceed the preset value (signal S37), the process proceeds to step S28, where the normal operation is executed and the operation is completed (step S29). The operation up to this is the function of the second stage as a protection device. As described above, in the case of the elevator control device according to the present embodiment, the elevator is emergency-stopped by the double protection device of the first stage and the second stage.

Next, referring to FIG.
A configuration for measuring the elongation of the image and making a correction will be described.
First, as shown in FIG. 4, an elevator rope elongation measuring means 51 for measuring the elongation of the elevator rope 3 is provided. This elevator rope elongation measuring means 51
Is input to the elevator rope elongation calculating means 53 of the position control device 13. The position detection signal S15 of the absolute encoder 15 is also input to the elevator rope elongation calculating means 53. The elevator rope elongation calculating means 53 receives the signal S from the elevator rope elongation measuring means 51.
51 and the position detection signal S of the absolute encoder 15
15 to calculate the elongation of the elevator rope 3,
This is output to the elevator rope elongation correction calculator 55 as a signal S53.

The calculation of the elongation of the elevator rope 3 will be specifically described.
Is moved by the elevator rope elongation measuring means 51. On the other hand, the absolute encoder 15 detects the number of steps at that time. If the elevator rope 3 is stretched, the number of steps becomes smaller than the predetermined number of steps. Therefore, by calculating how small the number of steps is, it is possible to calculate the elongation of the elevator rope 3 per 1000 mm and thus the entire elongation.

The above-mentioned elevator rope elongation correction calculator 55
Receives a position command signal S33, the elevator rope elongation correction calculator 55 corrects the position command signal S33 based on the signal S53, and outputs the corrected signal to the position error calculator 57 as a signal S55. The position error calculator 57 outputs a signal S57 to the elevator motor drive device 11 based on the signal. The elevator motor drive device 11 outputs a drive control signal S11 to the elevator motor 9 based on the signal.

According to the present embodiment, the following effects can be obtained. First, when the elevator motor 9 is controlled by the position control device 13, it is possible to prevent the elevator box 5 from performing an inappropriate operation due to a malfunction or the like of the device. At that time, the first-stage protection device and the second-stage protection device, that is, the stop command signal S21 from the protection error calculator 21 and the comparator 27
And the stop command signal S27 from the controller makes a double protection structure, so that the reliability is extremely high. Further, it is possible to correct a positional shift caused by the elongation of the elevator rope 3 due to aging.

The present invention is not limited to the above embodiment. For example, what to use as an encoder, how to set a set value, and the like are appropriately determined. In addition, the configuration of each unit illustrated in the drawings is an example, and various modifications can be considered.

[0028]

As described in detail above, according to the elevator control apparatus according to the present invention, first, when the elevator motor is controlled by the position control apparatus, the improper operation of the elevator box due to the malfunction of the apparatus or the like. This can be prevented beforehand. In this case, since the protection structure of the first stage and the protection device of the second stage have a double protection structure, the reliability is extremely high. In addition, it is possible to correct a displacement caused by the elongation of the elevator rope due to aging.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an embodiment of the present invention, and is a block diagram illustrating a configuration of an elevator control device.

FIG. 2 is a view showing one embodiment of the present invention, and is a flowchart showing the contents of control by an elevator control device.

FIG. 3 is a view showing one embodiment of the present invention, and is a flowchart showing the contents of control by the elevator control device.

FIG. 4 is a diagram illustrating an embodiment of the present invention, and is a block diagram illustrating a configuration of an elevator control device.

FIG. 5 is a diagram showing a conventional example, and is a block diagram showing a configuration of an elevator control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Traction sheave 3 Elevator rope 5 Elevator box 7 Counter weight 9 Elevator motor 11 Elevator motor drive device 13 Position control device 15 Absolute encoder (first encoder) 17 Incremental encoder (second encoder) 19 Position error calculator 21 Protection error calculation Device 23 Frequency-voltage converter 25 Speed calculator 27 Comparator 51 Elevator rope elongation measuring means 53 Elevator rope elongation calculating means 55 Elevator rope elongation correction calculator 57 Position error calculator

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiyoaki Kona 1-4-6 Yamato, Shizuoka City, Shizuoka Prefecture (72) Inventor Shinji Ide 1-240-4 Arihizaka, Shimizu City, Shizuoka Prefecture F-term (reference) 3F002 CA03 DA07 GB02 3F303 BA01 BA04 CB12 CB36

Claims (6)

[Claims] A first motor attached to an elevator motor;
An encoder; a second encoder attached to the elevator motor; first control means for outputting a stop signal based on a difference between a signal from the first encoder and a signal from the second encoder; and the first encoder. Or a second control means for outputting a stop signal based on a signal from the second encoder. 2. The elevator control device according to claim 1, wherein the first control means calculates a difference between a signal from the first encoder and a signal from the second encoder, and the difference is set to a preset value. An elevator control device for outputting a stop signal when the value exceeds a value. 3. The elevator control device according to claim 1, wherein the second control means outputs a stop signal when a signal from the first encoder or the second encoder exceeds a preset value. An elevator control device, characterized in that: 4. The elevator control device according to claim 1, wherein the first encoder is an absolute encoder, and the second encoder is an incremental encoder. . 5. An elevator rope elongation measuring means for measuring elongation of an elevator rope, and a correcting means for correcting a position command signal based on a signal from the elevator rope elongation measuring means. Elevator control device. 6. The elevator control device according to claim 1, wherein an elevator rope elongation measuring means for measuring elongation of the elevator rope, and a position based on a signal from the elevator rope elongation measuring means. An elevator control device comprising: a correction unit configured to correct a command signal.