JPS5832155B2 - Kouriyuue elevator - Google Patents

Description

[Detailed description of the invention] The present invention relates to an AC elevator control device.

When decelerating an elevator from a steady running state and stopping it at a target position, the running speed changes depending on the load, so
If the elevator is decelerated with a constant torque, the landing position of the elevator will change depending on the magnitude of the load.

For this reason, conventionally, in AC elevators that do not perform feedback control during steady running, a pole conversion motor is used to generate deceleration torque by switching to the multi-pole side in response to a deceleration command, and to operate at low speed in a multi-pole state. After aligning the position, a mechanical brake was activated to stop the landing.

However, in AC elevators that perform deceleration using feedback control, in order to shorten the deceleration time, it is generally not necessary to drive the elevator again after entering the deceleration state. In addition to adjusting the timing of deceleration, it is necessary to perform positioning control after entering the deceleration state.

In view of the above-mentioned points, it is an object of the present invention to provide an AC elevator control device that performs feedback control only during deceleration in an elevator using an AC feedback control system, thereby improving the landing accuracy.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block circuit diagram of an embodiment of an AC elevator control device according to the present invention.

1 is a terminal to which a positive potential is applied, 2 is a terminal to which a negative potential is applied, and 3 is a terminal in which the potential of terminal 1 or 2 is applied to the input side via contact XAt or contact XBt. A time vs. speed pattern generator (hereinafter referred to as speed pattern generator) that generates a time vs. speed deceleration pattern mainly composed of an integrating circuit (4) is a speed for detecting the rotational speed of an induction motor for driving an elevator. Detector 5 is a comparison circuit that compares the output proportional to the command speed from the speed pattern generator 3 and the output proportional to the actual speed from the speed detector 4 and outputs a speed deviation output; 6 is a comparison circuit of the comparison circuit 5; A speed control amplifier for amplifying the output, 1 is an output terminal from which the output of the speed control amplifier 6 is taken out via the deceleration switching switch 9a,
Although not shown, a thyristor control device for controlling the deceleration speed of the induction motor is connected to this terminal 7.

8 is a comparator to which the output of the comparator circuit 5 is guided via contact XA2, 9 is a coil that excites the deceleration changeover switch 9a, and 10 is a coil that excites the speed when the elevator load is the lightest and the speed is the highest. The set reference setter 11 is the output from the reference setter 10 and the speed detector 4
Comparison circuit 1 that compares the output from the
Reference numeral 2 designates a speed deviation detection amplifier that amplifies the output of the comparator circuit 11.

13 is a memory circuit that stores the output of the speed deviation detection amplifier 12 via a contact XB3, and the output is led to the input side of the speed pattern generator 3 in order to give a correction command to the speed pattern generator 3. It has become.

Contact XA1. XA2 is a normally open contact that closes when the elevator reaches the deceleration reference point, and contact XB1. XB2 is a normally closed contact that connects when the elevator reaches the deceleration reference point.

Next, the operation of the control device having the above configuration will be explained.

Until the elevator reaches the deceleration reference point, the induction motor for driving the elevator is driven with full voltage, and therefore:
The elevator travels at a speed that corresponds to the sliding rotation speed of the induction motor, which is determined according to the size of the load.

At this time, in the above control device, as shown in the figure, the contact
A1. XA2 opens and contacts XB1. Since XB2 is closed, a negative potential is applied to the input side of the speed pattern generator 3, and its output is also negative.

The output of the speed pattern generator 3 is compared with the output of the speed detector 4 in a comparator circuit 5, and the deviation value is led to an amplifier 6. The output corresponding to the maximum speed of the elevator is compared with the output of the speed detector 4, which is the actual measured speed of the elevator, and the output of this comparison circuit 11 is amplified to a constant ratio by a speed deviation detection amplifier 12, and then sent to contact XB2. The data is stored in the memory circuit 13 via.

The stored contents of this memory circuit 13 are led to the input side of the speed pattern generator 3 as a signal for controlling the deceleration command gradient of the deceleration pattern.

Now, when the elevator travels and reaches the position of the deceleration reference point, a deceleration start command is issued, contacts XA1 and XA2 close, and contacts XB1. Since the bottom of XB2 is open, a positive potential is applied to the speed pattern generator 3 through the contact XAt.

When the input side of the speed pattern generator 3 becomes positive, a command to generate a deceleration pattern is given, and the output of the speed pattern generator 3, which had been negatively charged until then, becomes the line b-c or line b=e in Figure 2. As shown in , it gradually decreases and is discharged to zero over time.

The deviation value between the deceleration pattern output of the speed pattern generator 3 and the actual elevator running speed from the speed detector 4 is supplied from the comparison circuit 5 to the comparator 8 through the contact XA2. No output is produced and the coil 9 is not excited until the deceleration pattern output becomes lower than the elevator running speed.

When the deceleration pattern output is lower than the elevator traveling speed, the comparator 8 generates an output and excites the coil 9.

The excitation of the coil 9 closes the deceleration changeover switch 9a, and the speed deviation value from the comparator circuit 5 is amplified and taken out to the output terminal 7.

In addition, the memory circuit 13
Since the input to the elevator is cut off by opening contact XB2, the difference between the actual elevator speed at the deceleration reference point and the reference speed is stored in the memory circuit 13 at this time.

Therefore, when the deceleration reference point arrival signal is issued, the detection amount from the amplifier 12 stored in the memory circuit 13 at this deceleration reference point, that is, the negative potential corresponding to the difference between the reference speed and the actual elevator speed. and contact point XA.

A certain amount of positive potential is applied to the speed pattern generator 3 through the speed pattern generator 3.

When the speed pattern generator 3 is given a certain amount of positive potential from the terminal 1, it generates a time vs. speed deceleration pattern as described above. The deceleration command gradient of this deceleration pattern output changes depending on the magnitude.

In other words, if the load on the elevator is light and the elevator is traveling quickly as shown by line A in Figure 2, the pattern will be such that the deceleration will be at a steep gradient from the deceleration reference point to the landing stop position as shown by line b-c. output, and when the load on the elevator is heavy and the running speed is slow as shown by line B, b-e
As shown by the line, a pattern output is generated that decelerates at a relatively gentle slope.

In this way, the difference in initial speed at the deceleration reference point is given from the memory circuit 13 to the speed pattern generator 3 as a control signal for varying the deceleration gradient of the deceleration pattern.

The output of the speed pattern generator 3 passes through a comparator circuit 5, is amplified by a speed control amplifier 6, and is taken out to an output terminal 7 through a switch 9a which is activated and closed by the output of a comparator 8.

Therefore, a deceleration control signal appears at the output terminal 7 from the time when the deceleration pattern output from the speed pattern generator 3 and the actual running speed of the elevator match.

That is, when the running speed of the elevator is high as shown by line A in FIG. switch 9a closes and deceleration starts.

In addition, when the running speed of the elevator is low as shown by line B, the deceleration pattern output of the speed pattern generator 3 shown by line b-e decreases to some extent, and the switch 9a is turned off at the intersection d that coincides with the elevator running speed. Closing deceleration begins.

In this way, even if the initial speed at the deceleration reference point changes, the deceleration command gradient of the deceleration pattern of the speed pattern generator is variably controlled by the change in initial speed, and the point at which deceleration actually starts is determined by the elevator running speed. and the deceleration pattern output, so that the area of the triangle a-b-c and the area of the trapezoid a-f-d-e, which are the traveling distance from the deceleration reference point to the landing position, are the same. controlled by.

As described above, according to the AC elevator control device of the present invention, the deceleration command slope of the deceleration pattern of the speed pattern generator is variably controlled depending on the magnitude of the initial speed of the deceleration reference point, and The deceleration control is actually performed from the point where the deceleration pattern matches, and the distance traveled from the deceleration start command point to the landing stop position is controlled to always be the same, so deceleration can be started smoothly and accurately. It has features such as being able to achieve an implantation state.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram of an embodiment of an AC elevator control system according to the present invention, and FIG. 2 is a deceleration pattern diagram of a speed pattern generator thereof. 3...Speed pattern generator, 4...Speed detector, 5...Comparison circuit, 6...Speed control amplifier, 8... Comparator, 9...
・・Excitation coil s9a of the speed changeover switch・・・・・
Speed selection switch, 10...Reference setter, 1
1... Comparison circuit, 12... Speed deviation detection amplifier, 13... Memory circuit, XAt. XA2... Normally open contact that closes in response to the deceleration reference point arrival signal, XBt, xB2... Normally closed contact that opens in response to the deceleration reference point arrival signal.

Claims (1)

[Claims] 1. In an elevator using an AC feedback control system that performs feedback control only during deceleration, a time vs. speed pattern generator that generates a deceleration pattern output from a deceleration reference point, a deceleration pattern of the time vs. speed pattern generator, and the actual running speed of the elevator. A circuit that performs deceleration control from the intersection with An AC elevator control device comprising: a circuit for variably controlling a deceleration command gradient of a deceleration pattern.