JP2002003091A - Elevator control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve elevator service by detecting the overload state in a stage prior to the rise up to a temperature the transition to the operation for decreasing the electric load of an elevator in order to prevent remarkable lowering of service caused by stopping the elevator when the temperature rises to the limit so as to always operate an elevator under the condition of a little lowering of service. SOLUTION: A main control device 20 takes a gradual or continuous temperature state signal output by a temperature detector 50, and controls for restraining the electric load of the elevator according to the signal 9. When the temperature state signal exceeds a certain preset threshold, a running pattern is changed to lower the acceleration to lighten the load of the elevator and run the same.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an elevator control system.

[0002]

2. Description of the Related Art The structure of a conventional elevator control system is shown in FIG. The conventional elevator control system 1 includes a main control device 2 for controlling an elevator and a power drive device 3 for controlling a power supply of a motor 4, and detects a state of a coil temperature of the motor 4 to control the main control device 2. Is provided with a temperature detector 5 for inputting the temperature. In the figure, 6 is a sheave, 7 is an elevator car, and 8 is a hanging weight.

In this conventional example, a temperature detector 5 is connected to an electric motor 4
However, it is common as a prior art to install the power drive device 3 mainly composed of power transistor elements, or to install both in the power drive device 3. However, in the following description, the case where the motor 4 is installed will be described.

[0004] The operation of the conventional elevator control system 1 is as follows. If the operation frequency of the elevator becomes excessive, the coil temperature of the electric motor 4 rises. When this temperature exceeds a threshold value, a temperature detector 5 installed in the motor 4
Outputs a temperature abnormality detection signal 9 to the main controller 2. Main controller 2 temporarily stops the operation of the elevator using the signal as a trigger. Then, after that, when the coil temperature of the electric motor 4 decreases and the output of the temperature abnormality detection signal 9 stops, the main control device 2 starts the elevator operation again.

Although not shown in FIG. 12, the hydraulic elevator detects the temperature of the driving oil instead of the motor temperature described above, and operates when the oil temperature exceeds a certain threshold value as described above. Control to pause.

[0006]

The conventional elevator control system configured as described above has the following problems. In a conventional elevator control system,
When a temperature abnormality signal is output from the temperature detector 5 for a device that generates heat (the electric motor in FIG. 12), the elevator is temporarily or permanently stopped to protect the device. This is because the temperature signal is detected only at the limit point, and as a result, there is a problem that the serviceability is significantly reduced.

The present invention has been made in view of such a conventional problem, and in order to avoid a remarkable decrease in service due to immediately stopping the elevator upon detection of the above-mentioned temperature abnormality signal, a step before the temperature abnormality is detected. The purpose of the present invention is to provide an elevator control system that detects an overload condition, changes elevator operating conditions, operates the elevator at all times with a slight reduction in service, and improves serviceability as a whole. I do.

[0008]

According to the present invention, a main control device for controlling the operation of an elevator, a power unit controlled by the main control device, and a device which generates heat by the operation of the elevator are provided. And, comprising a temperature detector to detect the temperature state, the main control device, in the elevator control system to stop the operation of the elevator when it is determined that the overload state based on the temperature state detected by the temperature detector, The main controller is configured to switch to an operation mode in which the electric load of the elevator is reduced before an overload state in which the operation of the elevator is stopped is performed based on a temperature state detected by the temperature detector. is there.

In the elevator control system according to the first aspect of the present invention, the main controller captures a stepwise or continuous temperature state signal output from the temperature detector and suppresses an electric load on the elevator according to the signal. Control. For example, when the temperature state signal exceeds a certain set threshold value, the travel pattern is changed so as to travel with reduced acceleration so as to reduce the load on the elevator.

This reduces the load on the heat-generating equipment and prevents the elevator from being overloaded to stop the operation by preventing the temperature from rising to the final temperature at which the control stops due to the overload condition. From the perspective of improving the operation rate of elevator operation.

According to a second aspect of the present invention, in the elevator control system according to the first aspect, the main control device temporarily performs a function related to an operation rate of the elevator depending on a temperature state detected by the temperature detector. The operation rate is reduced by stopping the operation.

According to a third aspect of the present invention, in the elevator control system according to the first aspect, the main controller increases the stoppage time of the elevator by slowing an opening / closing speed of the elevator to suppress the electric load. To reduce the electrical load and suppress the temperature rise of the equipment with little change in the operation rate.

According to a fourth aspect of the present invention, there is provided the elevator control system according to the first aspect, further comprising a cooling device that cools a device that generates heat by operating the elevator, and a cooling control device that controls an operation of the cooling device. Depending on the temperature state detected by the main controller, the temperature detector,
It is to give a command to increase the cooling capacity of the cooling device to the cooling control device to suppress the temperature rise of the device, to increase the cooling capability of the cooling device to suppress the temperature rise of the device, The elevator is prevented from being overloaded and stopped running by not raising the temperature to the final temperature at which the control stops due to the overload condition.

According to a fifth aspect of the present invention, there is provided a main control device for controlling the simultaneous operation of a plurality of elevators, a power unit controlled by the main control device, and a device which generates heat by the operation of each of the elevators. And a temperature detector for detecting the temperature state, and the main control device includes:
In an elevator control system that stops the operation of an elevator of a corresponding unit when it is determined that an overload state is present based on the temperature state detected by the temperature detector, the main control device is configured to perform the operation based on the temperature state detected by the temperature detector Before the overload state in which the operation of the elevator of the corresponding car is stopped, the number of calls to the elevator is reduced to reduce the electric load.

In the elevator control system according to the fifth aspect of the present invention, the main control unit takes in a stepwise or continuous temperature state signal output from the temperature detector, and responds to the signal to generate an overload state of the car. By reducing the number of call responses for the elevator, the operation rate of the unit is suppressed and the electrical load thereof is suppressed.

According to a sixth aspect of the present invention, in the elevator control system according to any of the first to fifth aspects, the main control device suppresses the electric load based on a time change of a temperature state detected by the temperature detector. The timing for switching to the mode is determined.Before entering the temperature state for judging the overload state, the operation is switched to the operation mode in which the load rises by watching the change in the temperature rise to suppress the operation stop due to the overload. To improve the overall availability of elevators.

According to a seventh aspect of the present invention, in the elevator control system according to any of the first to sixth aspects, the main controller determines the operation frequency of the elevator per unit time instead of the temperature state detected by the temperature detector. The load state is determined based on the load state, and the mode can be shifted to the load suppression operation mode for preventing operation stop due to overload without using the temperature detector.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an elevator control system according to a first embodiment of the present invention. The elevator control system according to the first embodiment has a main controller 20.
And a power drive device 3 that receives a power device control signal from the main control device 20 and controls the electric motor 4 as a power device. The electric motor 4 is driven to rotate by receiving driving power from the power driving device 3 via the power line 11. The electric motor 4 has a temperature detector 50 for detecting its temperature state.
Is provided.

The temperature detector 50 is a detector having a continuous or at least several levels of temperature detection levels.
Main controller 20 performs an operation of adjusting the operation rate of the elevator based on temperature signal 9 output from temperature detector 50. Components common to those in the conventional example shown in FIG. 12 are denoted by the same reference numerals. In addition, the temperature detector 50 is attached to a device that generates heat by the operation of the elevator, and is usually installed in the power drive device 3 including a power semiconductor element or the like and the electric motor 4 that drives a car. The embodiment will be described on the assumption that the motor 4 is installed.

The temperature detector 50 monitors a rise in the temperature of the electric motor 4 due to the operation of the elevator, and outputs a temperature detection signal 9 when detecting a temperature Tpre in a stage preceding the limit temperature Tat, to the main controller 20 which performs elevator control. input. The main controller 20 determines the traveling pattern of the elevator based on the temperature signal 9, and performs the load-suppressing operation of the elevator so that the electric motor 4, which is a heating device, does not further rise in temperature.

Next, the operation of the elevator control system according to the first embodiment will be described with reference to the flowchart of FIG.

Temperature signal 9 output from temperature detector 50
Is the limit temperature Tat of the device in the past, and it was necessary to stop the operation of the elevator as soon as the temperature signal was detected. However, in the present embodiment, the signal is gradually changed, for example, to the operation limit temperature. Output once at 80% of Tat (= Tpre). Here, the value of 80% is an example.

When the main controller 20 receives the temperature signal 9 of Tpre, the load control operation is started as follows (steps S100 and S105). As an example of the load suppression operation, the operation is performed with a reduced acceleration during traveling, or the vehicle is traveling at a reduced steady-state speed, thereby reducing the load on the electric motor 4 as a heat-generating device and suppressing an increase in temperature.

Thereafter, when the output of the temperature detector 50 returns to normal (if the temperature signal 9 is not output), the operation is returned to the normal operation (steps S110 and S115).

It should be noted that the abnormal temperature detection method in the present embodiment includes a temperature T in a stage before the above-described limit temperature Tat.
Pre may be output if it is detected, or the temperature detection signal T of the temperature detector 50 may be continuously output, and the main controller 20 may preliminarily detect an abnormal temperature threshold Tth (= Tpr).
e) may be provided, and by comparing the temperature signal T with the threshold value Tth, if T ≧ Tth, it is determined that an abnormality has occurred, and the load suppression operation of the elevator may be started.

As described above, according to the first embodiment, it is possible to prevent the elevator from stopping due to overheating of the equipment due to overload, to enable continuous operation, and to improve the operation rate.

Next, an elevator control system according to a second embodiment of the present invention will be described with reference to FIG. The feature of the second embodiment is that, unlike the first embodiment, the running pattern is not changed to reduce the load, but the operation other than the traveling of the car in response to the passenger call or the operation of the device is suppressed. The point is that a load suppression operation is performed to reduce the load on the vehicle. Therefore, the hardware configuration of the system is the same as that of the first embodiment shown in FIG. 1, but the control sequence is changed to that shown in the flowchart of FIG.

As in the first embodiment, the temperature detector 50
When the temperature abnormality signal 9 is output to the main controller 20, the operation related to the load, for example, the return operation of the reference floor, or the operation of the bleed-off operation in the hydraulic elevator is temporarily stopped so as to respond only to the passenger's call. (Steps S100 and S105 '). After that, the temperature detector 5
When the signal 9 of 0 returns to normal, the operation state is returned to normal (steps S110 and S115 ').

As a result, in the second embodiment, it is possible to reduce the operating load of the device that generates heat without changing the running pattern as in the first embodiment, and to suppress the heat generation of the device such as the electric motor 4.

Next, a third embodiment of the present invention will be described with reference to FIG. In the third embodiment, a cooling device 12 such as a variable output fan is installed in a device that generates heat (in FIG. 4, for example, the electric motor 4), and the temperature of the electric motor 4 exceeds Tpre, and the temperature detector 50 is used. Is characterized in that when the abnormal temperature signal 9 is output from the controller, the output of the cooling device 12 is increased to control the cooling capacity to be enhanced.

As shown in FIG. 4, the elevator control system according to the third embodiment includes a main control device 20 similar to that of the first embodiment, and a power drive device 3 controlled by the main control device 20. An electric motor 4 that receives the driving electric power from the power driving device 3 via the power line 11 and rotationally drives the electric motor 4; and a temperature detector 50 installed in the electric motor 4 and detects a temperature state thereof. A fan as a cooling device 12 for cooling the electric motor 4 generating heat by the operation of the elevator;
And a cooling control device 13 for controlling the operation of the cooling device 12 through a control signal 14 upon receipt of the control signal. The other components are common to the first embodiment shown in FIG. 1 and are denoted by the same reference numerals.

Next, the operation of the third embodiment will be described with reference to the flowchart of FIG. Upon receiving the abnormal temperature signal 9, the main control device 20 starts control to increase the cooling capacity of the cooling device 12 attached to the electric motor 4, which is a heating device (steps S200, S205). For example, when the cooling device 12 is composed of a plurality of fans, the number of operating fans is increased to increase the air volume, and in the case of a single fan, the fan control voltage is increased to increase the number of rotations to increase the air volume, and the like. I do.

When the abnormal temperature signal 9 returns to normal, the operation of the cooling device 12 also returns to normal (steps S210 and S215).

Thus, in the third embodiment, it is possible to operate the cooling device 12 according to the load state of the elevator, and to save energy in the cooling operation when the load is small.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
It will be described based on. The fourth embodiment is different from the third embodiment shown in FIG. 4 in that the main controller 20 takes in a temperature signal 9 from a temperature detector 50 attached to a heating device as a continuous signal. That is, the load state of the elevator is determined based on the rate of change of the temperature signal, and the load suppression operation is performed by any one of the above-described embodiments.

That is, as shown in the flowchart of FIG. 6, the temperature rise value Δth within a certain period of time in the normal load operation state is set in the main control device 20, and the main control device 20 sets the temperature rise value Δth to the threshold value Δth. When the temperature rise rate ΔT exceeding the value is recognized, it is determined that the overload operation is being performed, and the load suppression operation is performed (steps S300 and S3).
05).

When the temperature rise rate ΔT falls below the threshold value Δth, the operation returns to the normal operation (step S3).
10, S315).

Thus, in the fourth embodiment, it is possible to detect and respond to the overload operation state at an earlier stage based on the tendency of temperature rise.

Next, a fifth embodiment of the present invention will be described with reference to FIG. The elevator control system according to the fifth embodiment is characterized in that, in a system having a call assignment control device 16 as a device for performing call assignment control of a plurality of elevators, an overload of an elevator bank including a plurality of elevators is suppressed. are doing. In addition,
The call assignment control device 16 fetches the overload detection signal 17 from the main control device 20 of each elevator and assigns the baskets so that the loads are equalized.
This is to perform control to prevent one unit from being overloaded.

The operation of the elevator control system according to the fifth embodiment will be described with reference to the flowchart of FIG. When the main control unit 20 of the name unit detects an overload from the output signal 9 of the temperature detector 50, the call assignment control unit 16 inputs an overload detection signal from the main control unit 20 of the unit (steps S400 and S405). ).

When receiving the signal, the call assignment control device 16 reduces the call assignment rate of the overloaded car to reduce the load (step S410).

Thereafter, when the detection signal of the overloaded unit returns to normal, control returns to normal call assignment control (steps S415 and S420).

Thus, when a plurality of elevators are under group control, one car can be prevented from being overloaded, and control stoppage due to a rise in the temperature of the electric motor 4 can be prevented.

Next, a sixth embodiment of the present invention will be described with reference to FIG.
It will be described based on. The feature of this embodiment is that a car door opening / closing control device 21 is added, and when the temperature detector 50 detects a rise in the temperature of the electric motor 4, the main control device 20 informs the door opening / closing control device 21 of the opening / closing time of the car door. The point is that the elevator operating load factor is reduced by performing variable control of the length.

The door opening / closing time control performed by the door opening / closing control device 21 according to the command 22 from the main control device 20 will be described with reference to the flowchart of FIG. When the overload state is detected by the temperature signal 9 from the temperature detector 50 attached to the electric motor 4, the fact is transmitted to the door opening / closing control device 21 (steps S500, S505).

In response to the signal 22, the door opening / closing control unit 21 extends the car stop time by, for example, slowing the opening / closing speed of the door installed in the car 7, or elongates the door opening time, and similarly increases the car opening time. The load on the driving device is reduced by extending the stop time, and the temperature of the electric motor 4 is prevented from rising (step S510). Then, when the temperature of the electric motor 4 returns to normal, the door opening / closing time control is returned to the normal control (steps S515 and S520).

Thus, according to the sixth embodiment,
The load on the driving device can be reduced and the heat generation can be suppressed without changing the running pattern.

Next, a seventh embodiment of the present invention will be described with reference to FIG. FIG. 11 is a sequence flow of the operation of the elevator control system according to the seventh embodiment. In this embodiment, instead of detecting the overload state of the device by the signal 9 from the temperature detector 50,
The load state is detected based on the number of times the elevator is started, and the same load suppression operation as in any of the other embodiments is started. Therefore, the system configuration is shown in FIG.
2 is different from the conventional example shown in FIG. 2 in the load suppression operation executed by the main control device 2.

For example, the main controller 2 accumulates the number of times of activation within a certain period of time, and if the accumulated number is equal to or greater than a reference (set threshold) set in the main controller in advance, it is determined that overload operation is being performed. Then, the elevator load suppressing operation as in any of the above-described embodiments is started (step S60).
0, S605, S610).

If the load suppression operation continues for a predetermined period of time, the operation returns to the normal operation control (steps S615 and S620).

Thus, in the seventh embodiment, it is possible to estimate an overload state without using the temperature detector 50 of any of the above-described embodiments, which is advantageous in terms of equipment cost. Become.

[0052]

According to the first aspect of the present invention, the load on the equipment which generates heat before the temperature reaches the final temperature at which the control is stopped due to the overload condition is reduced, so that the elevator is overloaded and the operation is stopped. It is possible to prevent the operation of the elevator and to increase the operation rate of the elevator operation when viewed comprehensively.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, depending on the temperature state detected by the temperature detector, the main controller temporarily stops the function related to the operation rate of the elevator. By lowering the operation rate by stopping the operation, it is possible to suppress an increase in the temperature of the device before the overload is stopped and to continuously operate the elevator.

According to the third aspect of the present invention, in addition to the effect of the first aspect of the present invention, the main control unit slows down the door opening and closing speed of the elevator for which the electric load is to be suppressed, thereby extending the elevator stop time. However, it is possible to suppress an increase in the temperature of the device without substantially changing the traveling pattern.

According to the invention of claim 4, in addition to the effect of the invention of claim 1, depending on the temperature state detected by the temperature detector, the cooling capacity of the cooling device is increased to suppress the temperature rise of the equipment. In addition, it is possible to prevent the elevator from being overloaded and stopped running by not raising the temperature to the final temperature at which the control stops due to the overload condition.

According to the fifth aspect of the present invention, the main controller captures a stepwise or continuous temperature state signal output from the temperature detector, and calls the elevator which is likely to be overloaded in response to the signal. By reducing the assignment of responses, the operation rate of the car can be suppressed, and the electric load thereof can be suppressed.

According to the sixth aspect of the present invention, in addition to the effects of the first to fifth aspects, an operation mode in which the load is monitored by monitoring a change in temperature rise before the temperature state for determining the overload state is reached. Can be detected at an early stage of the overload of the elevator, and it is possible to reliably prevent the operation from being stopped.

According to the seventh aspect of the present invention, in the elevator control system of the first to sixth aspects, the main control device uses the operating frequency of the elevator per unit time instead of the temperature state detected by the temperature detector. Since the load state is determined, it is possible to shift to the load suppression operation mode for preventing operation stop due to overload without using the temperature detector.

[Brief description of the drawings]

FIG. 1 is a block diagram of a first embodiment of the present invention.

FIG. 2 is a flowchart of load suppression control according to the embodiment.

FIG. 3 is a flowchart of load suppression control according to a second embodiment of the present invention.

FIG. 4 is a block diagram of a third embodiment of the present invention.

FIG. 5 is a flowchart of load suppression control according to the embodiment.

FIG. 6 is a flowchart of load suppression control according to a fourth embodiment of the present invention.

FIG. 7 is a block diagram of a fifth embodiment of the present invention.

FIG. 8 is a flowchart of load suppression control according to the embodiment.

FIG. 9 is a block diagram of a sixth embodiment of the present invention.

FIG. 10 is a flowchart of load suppression control according to the embodiment.

FIG. 11 is a flowchart of load suppression control according to a seventh embodiment of the present invention.

FIG. 12 is a block diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elevator control device 3 Power drive device 4 Electric motor (power device) 7 Basket 12 Cooling device 13 Cooling control device 16 Assignment control device 20 Main control device 21 Door opening and closing control device 50 Temperature detector

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Michiyoshi Sonoda 1 Toshiba-cho, Fuchu-shi, Tokyo F-term in Fuchu Works, Toshiba Corporation (reference) 3F002 AA04 BA04 CA07 GB03 3F304 EA16 EA17 EB01 EB21 3F307 EA21

Claims (7)

[Claims] 1. A main control device for controlling the operation of an elevator, a power unit controlled by the main control device, and a temperature detector installed for a device that generates heat by the operation of the elevator and detects a temperature state thereof. The main control device, in an elevator control system that stops the operation of the elevator when it is determined that the overload state based on the temperature state detected by the temperature detector, wherein the main control device, the temperature detector An elevator control system, wherein the operation mode is switched to an operation mode for reducing an electric load of the elevator before an overload state in which the operation of the elevator is stopped based on a detected temperature state. 2. The system according to claim 1, wherein the main controller reduces the operation rate by temporarily suspending a function related to the operation rate of the elevator, depending on a temperature state detected by the temperature detector. Item 2. The elevator control system according to Item 1. 3. The elevator control system according to claim 1, wherein the main control device reduces an electric load by decreasing a door opening / closing speed of the elevator for suppressing the electric load. 4. A cooling device that cools a device that generates heat by operation of the elevator, and a cooling control device that controls operation of the cooling device, wherein the main control device is configured to detect a temperature state detected by the temperature detector. 2. The elevator control system according to claim 1, wherein a command is issued to the cooling control device to increase a cooling capacity of the cooling device to suppress a rise in temperature of the device. 5. A main control device for controlling the simultaneous operation of a plurality of elevators, a power unit controlled by the main control device, and a device which is installed for a device which generates heat by the operation of each of the elevators, and has a temperature state. And a temperature detector for detecting an overload condition based on a temperature state detected by the temperature detector. The main controller reduces the electrical load by reducing the number of calls to the elevator before the overload state in which the operation of the elevator of the corresponding unit is stopped based on the temperature state detected by the temperature detector. An elevator control system characterized in that: 6. The controller according to claim 1, wherein the main controller determines a timing of switching to an operation mode for suppressing the electric load based on a temporal change in a temperature state detected by the temperature detector. 5. The elevator control system according to any one of 5. 7. The load controller according to claim 1, wherein the main controller determines the load state based on the operation frequency of the elevator per unit time, instead of the temperature state detected by the temperature detector. 7. The elevator control system according to any one of 6.