JPS602581A - Control system of winding drum type 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 a control system for a drum-type elevator, and more particularly to a control system for a drum-type elevator in which a hoisting motor that drives the elevator is decelerated by direct current braking. be.

A drum type elevator generally has a configuration shown in FIG. In FIG. 1, 1 is a three-phase induction motor, 2 is a worm gear provided on the rotating shaft of the induction motor 1, and 3 is a worm wheel that meshes with the worm gear 2. These gears constitute a speed reducer. 4 is a rope hoisting drum directly connected to the worm wheel 3; 5 is a rope; 6 is a sheep attached to the ceiling 7 of the hoistway; the rope 5 is wound around the sheep 6; A cage 8 is connected to the end suspended from the cage.

Figure 2 shows an induction motor control circuit that enables DC braking.
The primary voltage of the motor is controlled by one-phase control on the power line connecting the two. Thyristors 1 connected in parallel with mutually opposite polarities
1 and 12 are connected in series, and further a thyristor 1.1
, 12 and the induction motor 1 are connected in series with a full-wave rectifier 13 for DC braking. 14 is a finger speed generator that detects the car speed, 15 is a deceleration command generator that generates a deceleration pattern, and 16 is a difference between the deceleration command value from the deceleration command generator 15 and the speed signal from the finger speed generator 14. The output signal of the operational amplifier 16 is used to trigger the ignition circuit 1 which triggers the thyristors 11 and 12.
7.

In the control circuit configured as described above, when decelerating the car, the deceleration command generator 1 generates the same deceleration pattern regardless of the driving direction.
5, the finger speed generator ignition circuit 17 is operated to trigger the thyristors 11 and 12, and the braking current flowing to the induction motor 1 through the full-wave rectifier 13 is controlled. That is, feedback control is performed to decelerate the car so as to follow the deceleration brake.

At this time, assuming that the car is running at the rated load and the car is at its rated load, a DC current Iou shown by the broken line in FIG. The current flowing in ■DU is the same as DU. Also.

The direct current IDC during descending operation is as shown by the solid line in FIG. As is clear from FIG. 3, the DC current IDD during descending operation is significantly larger than that during ascending operation, and this is because the deceleration pattern during ascending and descending operations is the same.

The current rating of the full-wave rectifier 13 is generally determined by the diode junction temperature and peak current. However, in the case of using the diode as described above, since the section where the current flows is the deceleration section during elevator operation, the junction temperature of the diode does not increase much, and the current rating of the diode is determined by the peak current flowing through the diode. be done. Therefore, if the same deceleration pattern is used during car deceleration regardless of the driving direction as in the conventional method described above, the DC current IDC during descending operation will become considerably large as shown in Figure 3, and this will be used for DC braking. The current rating of the diode of the full-wave rectifier 13 must be made considerably large. This requires the use of a relatively large capacity diode in the full-wave rectifier, which is also economically disadvantageous.

This invention solves the above problem by setting the gradient of the deceleration pattern during descending operation to be gentler than that during ascending operation, thereby reducing the rated current of the full-wave rectifier used for DC braking. An object of the present invention is to provide a control system for a winding drum elevator in which a full-wave rectifier can be constructed of a diode with a small capacity. Hereinafter, an embodiment of the system of the present invention will be described with reference to the drawings.

FIG. 4 is a block diagram showing an example of a control system for a drum type elevator according to the present invention, in which the same reference numerals as in FIG. 2 represent the same parts, 18 is a deceleration command generator,
The difference between this figure and that is that the deceleration patterns in ascending and descending operations are different. That is, as shown in FIG. 5, the gradient of deceleration pattern E during descending operation output from the deceleration command generator 18 is set to be gentler than the gradient of deceleration pattern I during ascending operation.

Therefore, when the elevator is in ascending operation, the thyristors 11 and 12 are controlled to fire by applying feedback control that follows the deceleration pattern 11, and the full-wave rectifier 13 is controlled to fire.
By controlling the braking current flowing to the induction motor 1 through the induction motor 1, the elevator is operated at a reduced speed. Furthermore, during descending operation, feedback control following deceleration pattern (2) is performed, thereby decelerating the elevator. As a result, the DC current IDtl during the upward operation and the DC current IDD during the downward operation become as shown in FIG. This sixth
As is clear from the figure, the peak values of DC current Iot+ and IDD during ascending and descending operations are the same, although the energization times are different, and the peak current during descending operations can be suppressed to the peak value during ascending operations. . This is because the current rating of the full-wave rectifier 13 is determined by the peak current, so the full-wave rectifier 13 only needs to have a small current rating, and it becomes possible to configure the full-wave rectifier with diodes of small capacity.

As explained above, according to the present invention, the slope of the deceleration pattern during descending operation is made gentler than the deceleration pattern during ascending operation, and the deceleration operations during ascending and descending are performed using different deceleration patterns. The peak value of the current used for braking can be suppressed, and accordingly, a full-wave rectifier with a small current rating can be used, which is economically advantageous.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a drum type elevator, Fig. 2 is a block diagram of a conventional deceleration operation control method for a drum type elevator, Fig. 3 is a characteristic diagram of a conventional DC current, and Fig. 4 is a diagram of the present invention. FIG. 5 is a block diagram showing an example of a deceleration operation control method for a winding drum type elevator, FIG. 5 is a characteristic diagram of a deceleration pattern in this invention, and FIG. 6 is a characteristic diagram of DC current in this FI 74. 1...Three-phase induction motor, 4...Lobe hoisting drum,
5... Rope, 6... Sheep, 8... Basket, II
, 1.2... Cyrisk, 13... Full wave rectifier, 14... Finger speed generator, J6... Operational amplifier, 17
...Ignition circuit, 18...Deceleration command generator. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa (2 others) 21 Figure 2 Number 4 Figure bag 5 Kakukaga 6 @ D ・1' Request for amendment (self-motivated) '59 6 22 Showa Year Month Day 1. Indication of the case Japanese Patent Application No. 111397/1982 2. Name of the invention Control method for winding drum elevator 3. Person making the amendment Part 5. Subject of amendment (1) Patent claims in the specification Scope column (2) Detailed description of the invention column 6 of the specification, contents of amendment (1) Amend the claims of the specification in a separate document. (2) On page 6, line 14 of the specification, replace the phrase “at peak value” with “
Correct it to about the peak value. 7. Attached documents (1) A document stating the entire text of the amended claims 1 document stating the entire text of the amended claims 2. Claims for controlling the braking force of an electric motor A braking device equipped with a control rectifier, a deceleration command generator, means for detecting the motor rotation speed, and arithmetic means for comparing the output of the means and the deceleration command generator and outputting a control signal to the braking device, This sets the gradient of the deceleration pattern during descending operation output from the deceleration command generator to be gentler than the deceleration pattern during ascending operation in a drum type elevator that brakes the electric motor that drives the car to decelerate it. A control system for a winding drum elevator.

Claims (1)

[Claims] A full-wave rectifier, a deceleration command generator, a means for detecting the motor rotation speed, and an arithmetic means for comparing the outputs of the means and the deceleration command generator to issue a feedback command, thereby driving the car. A winding drum type elevator in which the electric motor is decelerated by direct current braking, characterized in that the deceleration pattern during descending operation outputted from the deceleration command generator is set to be gentler than the deceleration pattern during ascending operation. Control method for winding drum elevators.