JPH0240594B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides an elevator door control system that limits the rotational torque of a motor when a motor rotational speed detection signal exceeds a predetermined value based on a motor speed command. Regarding equipment.

[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.

The differential amplifier circuit 4 is also configured to receive speed commands generated at each position of the door from the speed command circuit 3.

Figures 2a to 2c show the waveforms of the signals at each part in Figure 1. Figure 2a shows the speed command output from the speed command circuit 3, and Figure 2b shows the speed generator. The output signal of the device 2, and FIG. 2c 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, and an output signal as shown in FIG. 2b is input to the differential amplifier circuit 4. Further, a speed command signal as shown in FIG. 2a is inputted to the differential amplifier circuit 4 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 3, 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 is lost due to disconnection, the output of the differential amplifier circuit 4 becomes (+ ) side, the motor 1 will generate full torque, and the door will open and close in an irregular manner, which is dangerous.

The motor 1 may even burn out, which in the case of an elevator would pose a danger to passengers.

[Summary of the Invention] The present invention was made to eliminate the above-mentioned conventional drawbacks, and integrates the acceleration side output of the differential amplifier circuit, and when this integrated value exceeds a predetermined value, the motor torque is adjusted. The present invention proposes an elevator door control device that can ensure the safety of the elevator by restricting the number of elevator doors.

[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 FIG. 3, in order to avoid duplication, the same parts as in FIG. 1 are given the same reference numerals, and their explanations are omitted, and the parts different from those in FIG. 1 will be mainly described.

As is clear from comparing this FIG. 3 with FIG. 1, in FIG. It is.

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 detects the voltage level of the output of the differential amplifier circuit 4 and outputs it to the integration circuit 11.

The output of the integrating circuit 11 is sent to the voltage level detection circuit 12.
The voltage level detection circuit 2 outputs the voltage to the output limiter circuit 13 when the output voltage of the integration circuit 11 reaches a certain level or higher. The 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. 4a to 4d are signal waveform diagrams of each part in FIG. 3.

4a shows the speed command signal for each position of the door output from the speed command circuit 3, FIG. 4b shows the output signal of the speed generator 2, and FIG. 4c shows the output signal of the differential amplifier circuit 4. Further, FIG. 4d 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. 4b and is sent to the differential amplifier circuit 4.

Further, a speed command signal as shown in FIG. 4a is inputted from the speed command circuit 3 to the differential amplifier circuit 4 depending on the opening/closing position of the door. As a result, the differential amplifier circuit 4 receives the output signal of the speed generator 2 and the speed command circuit 3.
The fourth output signal is compared with the output signal of
Limiter circuit 1 outputs the output signal as shown in Figure c.
Output to 3.

The voltage level of the output signal of the differential amplifier circuit 4 is detected by the voltage level detection circuit 10, and when the output voltage of the differential amplifier circuit 4 is below a predetermined value, it is sent to the current amplifier circuit 5 through the output limiter circuit 13. The current amplifying circuit 5 supplies current to the motor 1 in accordance with the output level of the differential amplifying circuit 4, and controls the rotational speed of the motor 1 in the same manner as in the prior art.

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 equal to or higher than a predetermined value, and outputs the output to the integration circuit 11. . Integrating circuit 11
integrates the output of the voltage level detection circuit 10, and the integrated output is detected by the voltage level detection circuit 12.

This voltage level detection circuit 12 detects when the integrated output of the integrating circuit 11 exceeds a certain level.
In other words, if the output of the voltage level detection circuit 10 does not remain at a predetermined level for a predetermined period of time or more, the integrator circuit 11
Since the output of the voltage level detection circuit 12 decreases, the voltage level detection circuit 12
is not output.

That is, the integration circuit 11 and the voltage level detection circuit 1
2 detects that the output of the voltage level detection circuit 10 continues for a certain period of time, and outputs 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. 4d, the output limiter circuit 13 outputs to the current amplifier circuit 5, and the output limiter circuit 13 limits the output of the differential amplifier circuit 4, so that the output of the differential amplifier circuit 4 is Until the condition returns to normal, a low current is applied to 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 structure of another embodiment of the invention. In the case of this FIG. 5, an output cutoff circuit 14 and a timer 15 are further added to the configuration of FIG.

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

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

In the embodiment shown in FIG. 5, simultaneously with the (+) 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 limiter circuit 14 (time t
2).

Next, when the time t3 set by the timer 15 is reached, the timer 15 outputs an output and the disconnection circuit 1
4, the output of the output limiter circuit 13 gradually increases to an output level that allows the motor 1 to rotate at a low speed, and the output of the output limiter circuit 14 is amplified by the current amplifier circuit 5 and supplied to the motor 1. do.

By doing this, for example, the passenger's hand may be drawn into the door pocket rather than the door circuit malfunctioning.
When the door stops and the differential amplifier circuit 4 reaches (+) saturation, the torque of the motor 1 is temporarily reduced to zero, giving the passenger time to pull out, thereby improving safety.

As described above, according to the elevator door control device of the present invention, when the deviation between the rotational speed of the motor and the speed command signal exceeds a predetermined value, the deviation is integrated, and when the integrated value becomes larger than a certain level, , the current supplied to the motor is limited, so
Elevator safety can be ensured.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional elevator door control device, FIG. 2 is a signal waveform diagram of each part of the elevator door control device shown in FIG. 1, and FIG. 3 is an implementation of the elevator door control device of the present invention. FIG. 4 is a block diagram showing the configuration of an example. FIG. 4 is a signal waveform diagram of each part of the elevator door control device of FIG. 3. FIG. 5 is a block diagram showing the configuration of another embodiment of the elevator door control device of the present invention. 6 are signal waveform diagrams of various parts of the elevator door control device shown in FIG. 5. DESCRIPTION OF SYMBOLS 1...Motor, 2...Speed generator, 3...Speed command circuit, 4...Differential amplifier circuit, 5...Current amplifier circuit, 1
0, 12... Voltage level detection circuit, 11... Integrating circuit, 13... Output limiter circuit, 14... Output line disconnection circuit, 15... Timer. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A motor that drives the elevator doors to open and close; a differential amplifier circuit that outputs the deviation between the rotational speed of this motor and a speed command signal that corresponds to the opening and closing position of the door;
An abnormality detection circuit that integrates the output of this differential amplifier circuit when it exceeds a predetermined value and operates when the integrated value exceeds a certain level, and an output that limits the current flowing through the motor when this abnormality detection circuit operates. An elevator door control device equipped with a limiter circuit.