JPS586881A - Controller for frequency of operation of elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to elevator operation control, and particularly to an operation frequency control device.

The permissible operating frequency of an elevator is determined by the permissible temperature of the drive motor used.

Therefore, if the elevator is used at a frequency exceeding the set value, the temperature of the motor will naturally exceed the allowable value, which will eventually lead to deterioration of the insulation of the motor and eventually burnout.

Conventionally, as a method to prevent the above-mentioned problems, a temperature sensor is embedded in the coil of the motor to detect the coil temperature.
When the coil temperature reaches the temperature detector's set value (motor permissible temperature), the detector operates and the elevator stops operating.

However, in this method, when the temperature sensor is activated, the operation is immediately stopped. In particular, this temperature sensor operates when it is used frequently, that is, when there are many customers, and it becomes a major hindrance.

For this reason, it is considered that the frequency of elevator operation within a certain period of time is counted, and when this count value exceeds a set value, the door opening time limit is extended and the operation is suppressed. . However, with this system, when the number of trips temporarily increases, that is, when the number of passengers temporarily increases, operations are suppressed, resulting in a decline in service. Also, when the motor temperature is rising,
Even if the number of operations within a certain period of time is within the set value, there is a risk that the motor burnout prevention temperature switch will be activated and the operation will be stopped. Therefore, the above-mentioned set value needs to be set to a small value with a margin, which may unnecessarily suppress driving and degrade service.

On the other hand, the frequency of elevator operation varies depending on the delivery destination, and cannot be determined until after the elevator is in operation.

Therefore, it is necessary to deliver the product with sufficient motor capacity, and depending on the pill, an unnecessarily large and expensive motor may be used.

An object of the present invention is to efficiently operate an elevator drive motor within the permissible temperature range x v < -1.
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A feature of the present invention is that the frequency of operation of the electric motor in a plurality of time periods is detected by counting the number of times the electric motor is operated in each different first and second unit time, and the frequency of operation of the electric motor in each unit time is detected. The structure is such that the operation of the electric motor is suppressed depending on the number of times the motor is operated. For example, by counting the number of driving times in the immediately preceding unit of time and the number of driving times in a second unit of time that includes the previous time period, not only the driving frequency immediately before but also the driving frequency before that can be considered. The system is designed to suppress and release the suppression of driving.

The present invention will be described below with reference to an illustrative embodiment.

FIG. 1 shows an elevator for implementing the present invention -=tt
This is a block diagram of the control circuit, here is an AC elevator.
shows.

In the figure, an elevator seat 1 and a counterweight 2 are suspended from a sheave 4 via a rope 3 in a hanging shape. The sheave 4 is connected to the elevator via the reducer 5.
The motor is connected to a driving three-phase induction motor 6 and an electromagnetic brake 7, and the induction motor 6 is connected to a generator 8, for example, an AC speed generator 8, which generates a loss proportional to the traveling distance.

R, T, 8 are three-phase AC power supplies, which are connected to the thyristor control device 16 and are switched between raising, lowering 9, normal operation, maintenance operation, etc. by a combination of switches of the main contact circuit 17.

Here, the thyristor control device 16 is configured in combination with a thyristor or a switch, and is controlled by a drive circuit such as the phase shifter 15 and the switch. The phase shifter 15
controls the firing of the thyristor 16 in response to the speed command signal 18 etc. from the elevator control digital computer 14. The computer 14 inputs signals from the speed generator 8 and performs speed feedback control. This causes the passenger car 1 to travel at a speed similar to the speed command 18 commanded by the computer 14.

Further, the position detectors 10 and 11 attached to the passenger car 1 are activated when passing through the shield plate 9 provided in the tower, and the position signal at this time is transmitted to the computer 14 via the waveform shaping circuit 12. be done.

Such elevator control circuits are well known;
FIG. 2 shows a flowchart of a well-known main program built in the star beta control digital computer 14.

As shown in FIG. 2, this main program 100 first executes initialization processing in step 110. Next, step 120 is executed to sequentially execute various elevator processes at predetermined time intervals. If the timer flag is set in this step 120, an input processing step 130 is executed to input into the computer 14 the data required for elevator-IIJN.

Next, in step 140, car position calculation processing is performed based on the pulses proportional to the travel distance from the AC speed generator 8. At step 150, elevator operation management is performed based on input data such as calls and the car position data calculated at step 140, and operation frequency control, which is a feature of the present invention, is executed as described later. In step 160, elevator speed control processing is executed.

In step 170, the control data calculated above is output, and the elevator is controlled via the relay drive circuit 19 and phase shifter 15 based on the output control data.

In an apparatus having such a configuration and control, in this embodiment, the process shown in FIG. 3 is performed in the elevator management process step 150. That is, in addition to the normal operation management processing step 200, a driving frequency measurement processing step 300 and a driving frequency suppression processing step 400 are executed.

FIG. 4 is a detailed flowchart of the driving frequency measuring process step 300, and FIG. 5 shows a memory map of data used here.

Here, the number of operations is measured by counting the start signals set in operation management processing step 200, but in addition to this, signals generated in proportion to the number of operations, such as deceleration commands, etc.;・It can be similarly realized by counting □′.

In the figure, in step 310, it is determined whether there is a start signal -, and if the start signal is present, step 320
Execute and count up the startup count register by 1. Therefore, the number of times the elevator has been started is set in this start-up count register.

Next, in step 330, the value of timer t is set to 3 for unit time.
Determine whether the score is 7 or higher. This unit time ΔT is a value corresponding to the first unit time. If the value of timer t is 77 or more, step 340 is executed, and if it is less than 77, this subroutine is ended.

In step 340, addresses AD1 to AD9 in FIG.
The counting data stored in addresses AD2 to AD
Shift to 10. Therefore, data n, at address ADIO. is deleted.

In step 350, the count value of the activation count register is stored in address ADI, and in step 360, this count value is
0". Therefore, the latest count value n1 is always stored in address ADI, and addresses AD2 to
The previous count values n2 to n and o are respectively stored in ADIO.

Then, in step 370, addresses ADI to ADI
The total sum nT of the count values of O is calculated and the value nT is stored in address ADII. That is, the second count value per unit time is stored at address AD11.

After completing such processing, the timer t is reset in step 380. Therefore, thereafter, the number of activations is counted in step 320 during the unit time t.

In this way, the first count value n1 per unit time and the second count value nT per unit time are measured.

FIG. 6 is a detailed flowchart of the driving frequency suppression process 400. Although it is shown here that the main program is executed every time the main program is processed, it may be executed every time following step 370.

In the figure, in step 410, it is determined whether the first number of operations per unit time n1 exceeds a set value N8, and if it is less than the set value N1, the process on the right is executed to perform normal operation. If the set value N1 is exceeded, then step 420
is executed, and the number of operations nt during the second unit time, which is a long time interval, is compared with the set value N. At this time, if the number of operations nt also exceeds the set value Nt, the door close button is disabled in step 450. Therefore, even if the passenger operates the door close button, the door will not close until the non-interference time period has elapsed, and driving will be suppressed. moreover,
In step 460, the door opening time limit extension time Δd is set to 31
Extend for just one hour.

Therefore, each time this step 460 is executed, Δt,
Takeo door opening hours will be extended.

Finally, in step 470, the door opening time limit extension time Δd
It is determined whether t exceeds the set value DT. This set value DT is preset to the maximum door opening time extension time, and if this set value DT is exceeded, it is determined that there is an abnormality.
In step 480, the elevator is stopped.

1. If it is determined in step 420 that the second count value n per unit time does not exceed the set value vt, step 430 is executed and the number of times m w at 1 pp is counted up. This counts the number of times that the first count value n1 per unit time exceeds the set value N, and the second count value n per unit time does not exceed the set value N. If the value m or the predetermined number of times M is exceeded, step 45 is also performed.
0, 460 is executed to suppress elevator operation.

The above operation is delayed each time this operation frequency suppression processing step 400 is executed, and each time step 460 is executed, the extension time Δdt of the door opening time limit gradually increases.

On the other hand, when the driving frequency is suppressed as a result of extending the door opening time limit, the count value n1 for the first unit time gradually decreases, and when it becomes equal to or less than the set value N1, step 440 is executed.

In step 440, the second count value per unit time “・
Compare and set value ゞ・:, 1゜, count value n
, is not equal to or less than the set value N, the program is immediately terminated. When the count value n is less than or equal to the set value N, the number of times m and the door opening extension time Δd are reset to 0 in step 445.

Here, the first unit time t is 5 if it is a normal electric motor.
The setting value N1 at that time may be set to the current allowable operating frequency, which is a unit time determined by the allowable temperature rise value of the electric motor.

Therefore, the second unit time in the above embodiment is t×10, and the set value N at that time may be set to the allowable operating frequency per time t×10.

In this way, in this embodiment, the driving frequency is suppressed and controlled in accordance with the number of times of driving not only in the immediately preceding short first unit time but also in the preceding long second unit time. Therefore, even if the number of previous operations is large, it is possible to perform service without unnecessarily restricting operation according to the previous operating state, and the number of operations immediately before is reduced. Immediately returning to normal operation will prevent damage due to a sudden rise in motor temperature.

It can be prevented.

In the embodiment described above, two types of unit time were used, but three types of unit time were used.
It is also possible to set more than one type of unit time and to suppress the operation according to the number of times of operation per single position time.

Further, since the temperature of the electric motor is most affected by the number of times of operation, in the above embodiment, only the number of times of operation is measured. However, it goes without saying that by adding the load condition of the elevator to the control elements in addition to the number of operations, even more precise operation suppression control becomes possible. FIG. 7 shows an example of such a case.

This FIG. 7 replaces steps 3.10 and 320 of FIG. 4. In this embodiment, it is determined in step 720 whether the elevator is under heavy load or not, and if the elevator is under heavy load, the start count register is incremented by u2'' in step 730.

That is, in the case of a heavy load, the motor temperature rise rate is higher than that of a light load, and this is converted into the starting frequency of two times. In this case, the set value N1. Of course, Nt should also be set to a considerable value.

As described above, according to the present invention, the operating frequency of the elevator can be controlled with high precision, so that efficient elevator service can be provided within the permissible temperature of the electric motor.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of an elevator control device to which the present invention is applied, Fig. 2 is a flow chart for explaining the main program of the elevator control computer, and Figs. 3 to 6 are an embodiment of an elevator control device according to the present invention. Figure 3 is a flowchart for explaining the elevator management processing program, and Figure 4 is a flowchart for explaining the operation frequency measurement processing program.
FIG. 5 is a memory map, FIG. 6 is a flowchart for explaining a driving frequency suppression processing program, and FIG. 7 is a flowchart for explaining a driving frequency measurement processing program according to another embodiment of the present invention. Funeral/Illustration

Claims (1)

[Scope of Claims] 1. An elevator car that travels on multiple floors, an elevator drive motor that drives the car, and a device that limits the operation of the motor according to the frequency of operation of the drive motor. at least a first counting means for counting the number of times the electric motor is operated per first unit time, and a second counting means for counting the number of times the electric motor is operated per second unit time different from the first unit time. An elevator operation frequency control device comprising: counting means; and means for suppressing operation of the electric motor according to the first and second number of operations per unit time. 2. An elevator operation frequency control device according to claim 1, wherein the second unit time is set to include a time period before the first unit time. 3. In claim 1, the first and second counting means count the number of times the electric motor is operated, and set the latest counted value per unit time as the first counted value; An elevator operation frequency control device configured to calculate a count value before a first count value as a second count value. 4. In claim 3, the operation suppressing means is configured to suppress the operation of the electric motor according to the second count value when the first count value is equal to or higher than a predetermined value. Elevator operation frequency control device. 5. An elevator operation frequency control device according to claim 4, which is configured to extend the door opening time when the second count value is equal to or greater than a predetermined value. 6. Claim 3, wherein the operation suppression means is configured to release the operation suppression according to the second count value when the first count value is less than or equal to a predetermined value. operating frequency control device.