JPS6071489A - Controller for elevator door - 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 [Technical Field of the Invention] The present invention provides an elevator door which limits the rotational torque of a motor when a motor speed command and a motor rotational speed detection signal become larger than a predetermined value. Regarding a control device.

[Prior art]

FIG. 1 is a block diagram of a conventional elevator door control device, showing an example of a general speed feedback control system. In this FIG. 1, 1 is a motor. The motor 1 drives the doors of an elevator (not shown) to open and close.

The rotation speed of the motor 1 is detected by a speed generator 2, and the output of this speed generator 2 corresponds to the opening/closing speed of the door. This output is sent to a differential amplifier circuit 4.

A speed command generated at each position of the door is also input from the speed command circuit 3 to the differential amplifier circuit 4 between the door and the door.

20 to 2(C) show the waveforms of the signals in each part of FIG. 1, and FIG. 2(a) shows the speed command output from the speed command circuit 3, and 2) is the output signal of the speed generator 2, and FIG. 2(C) is the output signal of the differential amplifier circuit 4.

Now, the rotational speed of the motor 1 is detected by the speed generator 2,
An output signal as shown in the second figure is input to the differential amplifier circuit 4. In addition, the differential amplifier circuit 4 with
) is input from the speed command circuit 3.

As a result, the differential amplifier circuit 4 takes the deviation between the output of the speed generator 2 and the speed command from the speed command circuit 2, amplifies the deviation in the current amplifier circuit 5, and controls the current of the motor 1. , thereby controlling the rotational speed of the motor 1.

However, in such a conventional elevator door control device, if the differential amplifier circuit 4 itself breaks down or the feedback from the speed generator 2 becomes disconnected, the output of the differential amplifier circuit 4 will be reduced. ()), the motor 1 generates full torque, and the door opens and closes in an irregular manner, which is dangerous.

In the case of an elevator, the motor 1 could burn out, but this would pose no danger to the passengers.

[Summary of the invention]

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional art, and integrates the acceleration side output of the differential amplifier circuit, and limits the motor torque when this integrated value exceeds a predetermined value. The present invention proposes an elevator door control device that can ensure elevator safety.

[Embodiments of the invention]

Embodiments of the elevator door control device of the present invention will be described below with reference to the drawings. FIG. 3 is a block diagram showing the configuration of one embodiment. In this Figure 3, to avoid duplication, the same parts as in Figure 1 are designated by the same reference numerals.
The explanation thereof will be omitted, and the parts different from those in FIG. 1 will be mainly described.

As is clear from comparing Figure 3 with Figure 1,
In the figure, the parts indicated by reference numerals 10 onwards are newly added parts, and are the parts that are characteristic of the embodiment of FIG. 3.

That is, the output of the differential amplifier circuit 4 is output to the voltage level detection circuit 10 and the output limiter circuit 13. This voltage level detection circuit 10 is a differential amplifier circuit 4
The voltage level of the output is detected and output to the integrating circuit 11.

The output of the integrating circuit 11 is sent to a voltage level detecting circuit 12, and when the output voltage of the integrating circuit 11 reaches a certain level or higher, the voltage level detecting circuit 12 detects an output limiter circuit 13.
It is designed to output to . , output limiter circuit 13
limits the output of the differential amplifier circuit 4 and outputs it to the current amplifier circuit 5.

Next, the operation of the elevator door control device of the present invention configured as described above will be explained. FIGS. 4(a) to 4(d) are signal waveform diagrams of each part of FIG. 3.

Figure 4 (&) shows the speed command signal for each position of the door output from the speed command circuit 3, and Figure 4 (b) shows the speed command signal from the speed generator 2.
4(C) shows the output signal of the differential amplifier circuit 4, and FIG. 4(d) shows the output signal of the output limiter circuit 13.

Now, when the rotational speed of the motor 1 and the opening/closing speed of the door are detected by the speed generator 2, the output is as shown in Fig. 4(b).
The signal is then sent to the differential amplifier circuit 4 as shown in FIG.

In addition, a fourth
A speed command signal as shown in the figure (-) is input to the differential amplifier circuit 4. Accordingly, the differential amplifier circuit 4 compares the output signal of the speed generator 2 and the output signal of the speed command circuit 3, takes the deviation, and produces an output signal as shown in FIG. 4(C). Output to the output limiter circuit 13.

The output signal of this differential amplifier circuit 4 is the voltage level detection circuit 1.
0, the voltage level is detected, and when the output voltage of the differential amplifier circuit 4 is below a predetermined value, the output limiter circuit 1
3 to the current amplifier circuit 5, and the current amplifier circuit 5 supplies current to the motor 1 according to the output level of the differential amplifier circuit 4, and controls the rotational speed of the motor 1 in the same manner as in the conventional method.

However, as shown in FIG. 4, at time t1, the voltage level detection circuit 10 detects that the level of the output signal of the differential amplifier circuit 4 is higher than a predetermined level, and outputs the output to the integration circuit 11. . Integrating circuit 11 integrates the output of voltage level detecting circuit 10, and the integrated output is detected by voltage level detecting circuit 12.

According to this voltage level detection circuit 12, when the integrated output of the integration circuit 11 continues to be at a certain level or higher for a certain period of time, the output of the voltage level detection circuit 1o changes for a certain period of time or more, y1
If the constant level does not continue, the output of the integrating circuit 11 will decrease, so the voltage level detecting circuit 12 will not output.

That is, the integration circuit 11 and the voltage level detection circuit 12 detect that the output of the voltage level detection circuit 10 continues for a certain period of time, and output the output of the voltage level detection circuit 12 to the output limiter circuit 13 at time t2.

As a result, as shown in FIG. 4(d), the output limiter circuit 13 outputs the current to the current amplifier circuit 5, and the output limiter circuit 13 limits the output of the differential amplifier circuit 4. Until the output returns to normal, a low current is passed through the motor 1 to drive the door at a low speed.

In this way, the safety of passengers can be ensured, and since the doors are opened and closed at low speed, accidents such as so-called canned food can be prevented without system failure of the elevator.

FIG. 5 is a block diagram showing the configuration of another embodiment of the invention. In the case shown in FIG. 5, an output cutoff circuit 14 and a timer 15 are further added to the configuration shown in FIG.

That is, the output of the voltage level detection circuit 12 is
The output of the timer 15 is also sent to the output cutoff circuit 14. The output cutoff circuit 14 is connected between the output limiter circuit 13 and the current amplification circuit 5.

6(-) to 6(e) are signal waveform diagrams of each part in FIG. 5, and FIG. 6(a) is a speed command signal output from the speed command circuit 3. Figure 6(b) shows the output of the speed generator 2, Figure 6(c) shows the output of the differential amplifier circuit, and Figure 6(d)
) is the output of the output limiter circuit, and FIG. 6(e) is the output of the output cutoff circuit.

In the embodiment shown in FIG. 5, at the same time as (g) saturation of the differential amplifier circuit 4, the voltage level detection circuit 12 outputs an output to the timer 15 to activate the timer 15. At the same time, the output of the output limiter circuit 13 is temporarily lowered to zero by the output cutoff circuit 14 (time 1 tl t 2 ).

Next, when the time t3 set by the timer 15 is reached, the timer 15 outputs an output, and through the output cutoff circuit 14, the output of the output limiter circuit 13 is gradually increased to an output level that allows the motor 1 to rotate at a low speed. Go, current amplifier circuit 5
Alternatively, the output of this output cutoff circuit 14 is amplified and supplied to the motor 1.

By doing this, for example, when the passenger's hand is pulled into the door pocket and the door stops due to a failure in the door circuit, and the differential amplifier circuit 4 reaches zero saturation, the torque of the motor 1 will be increased. This reduces the amount of fuel to zero, giving passengers time to pull out, thereby improving safety.

As described above, according to the elevator door control device of the present invention, the deviation between the rotational speed of the motor and the speed command signal is amplified by the integrating circuit, and when this integral value increases beyond a predetermined value,
Since the current supplied to the motor is limited, the safety of the elevator can be guaranteed.

[Brief explanation of the drawing]

Figure 1 is a block diagram of a conventional elevator door control device.
2 is a signal waveform diagram of each part of the elevator door control device shown in FIG. 1, FIG. 3 is a block diagram showing the configuration of an embodiment of the elevator door control device of the present invention, and FIG. FIG. 5 is a block diagram showing the configuration of another embodiment of the elevator door control device of the present invention, and FIG. 6 is the elevator door control device of FIG. 5. FIG. 3 is a signal waveform diagram of each part of FIG. DESCRIPTION OF SYMBOLS 1... Motor, 2... Speed generator, 3... Speed command circuit, 4... Differential amplifier circuit, 5... Current amplifier circuit, 1o. 12... Voltage level detection circuit, 11... Integrating circuit,
13... Output limiter circuit, 14... Output cutoff circuit, 15... Timer Note that the same reference numerals in the drawings indicate the same or equivalent parts. Agent: Masuo Oiwa (2 others) Meeting 1al f#11m1 Rei Graduation Forward! a Illustrated spear 6 Written amendment to figure procedure (spontaneous) l, Indication of the case Japanese Patent Application No. 58-162825 2, Title of the invention Elevator door I control device 3, Person making the amendment 5, Subject of amendment (1) Details ν1 Column 6 of Detailed Description of the Invention, Contents of Amendment (1) Specification 7!1 Page 3, Line 1 January - Speed Command Circuit 2''
Correct the text to read "1 speed command circuit 3". (2) Page 6 of the specification, page 1, 11, ``... 2 continues for a certain period of time'' is changed from 1 to 1-, and supplemented with 11:.

Claims (1)

[Claims] A motor that drives the opening and closing of elevator doors, a differential amplifier circuit that takes the deviation between the rotational speed of this motor and speed command No. 46 according to the opening and closing positions in the above field, and a differential amplifier circuit that integrates the output of this differential amplifier circuit and calculates the difference. A control device for an elevator door, comprising means for restricting current flowing through the motor when the integral value becomes larger than a predetermined value.