JPS6317781A - Controller for 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 [Field of Industrial Application] The present invention relates to an elevator control device, and more particularly to a control device suitable for an elevator that performs floor landing correction by an auxiliary electric motor via a power transmission device.

[Conventional technology]

The conventional device is a system in which an auxiliary electric motor moves the elevator at a very low speed via a power transmission device in order to correct the landing error of the elevator. However, no consideration was given to safety in the event that this power transmission device malfunctions.

Regarding this device, there is Japanese Patent Application Laid-open No. 58-95084.

[Problem that the invention seeks to solve]

The above-mentioned prior art does not give consideration to the safety of the elevator system in the event of a failure of the power transmission device, and there is a problem in that the elevator car becomes free running when the power transmission device fails.

SUMMARY OF THE INVENTION An object of the present invention is to provide a control device that detects a failure in the power transmission device, activates a brake when the failure occurs, and prevents the elevator from running freely.

[Means for solving problems]

The above purpose is to detect whether the power supply of the power transmission device is normal or not, operate the brake in the event of an abnormality, and compare the rotation speed on the input side and output side of the power transmission device to detect an abnormality. This is sometimes achieved by operating the brake.

[Effect]

Detects a failure in the power transmission system and activates the elevator brake in the event of a failure. This prevents the elevator from running freely and maintains safety.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 3 shows an elevator system related to the present invention.

The power of the main electric motor 6 is transmitted to the sheave 3 via the brake 5 and the speed reducer 4, and the heel 1 and counterweight 2 connected by the rope 11 are driven up and down. In this system, the driving force of the auxiliary motor 9 is further transferred to the auxiliary motor reduction gear 8 and the power transmission device (for example, an electromagnetic clutch).
7, the car can be driven in the same way. When an operation command is issued to the elevator, contact H1 of the N diversion contactor (circuit diagram omitted) is turned on, three-phase power supply 10 is applied to the main motor 6, and the main motor is started. Similarly, the contact Hz of the driving contactor is connected to the magnetic coil of the brake machine 5.
When turned on, voltage is applied, the brake is released, and the elevator is operated. When reaching near the destination floor, a stop command is issued, the operating contactor is turned off, the main motor 6 is disconnected from the three-phase type g10, and at the same time the brake 5 is activated and the elevator heel 1 is stopped. At this time, if the difference between the car floor and the hall floor is greater than the predetermined landing difference, the position detector (
(not shown) detects this and issues a landing correction command. In response to this command, a landing correction contactor (not shown) is turned on, its contact LL is turned on, and the three-phase power supply 10 is connected to the auxiliary motor 9.

In addition, by connecting the power source to the power transmission device 7,
The auxiliary motor 9 and the main motor 6 are directly connected.

Voltage is also applied to the brake 5 by turning on the contact L2 of the landing correction contactor, the brake is released, and the elevator car 1 is operated at a slow speed. When the car floor and the hall floor reach a predetermined level, the position detector detects this, cancels the landing correction command, turns off the landing correction contactor, and at the same time as the auxiliary motor 9 stops, the brake is activated. It works and the elevator stops.

In the elevator of this system, when the power transmission device 7 fails, the brake 5 is released, and the elevator heel 1 and counterweight 2 are in a free running state without transmitting the driving force. Under load conditions where there is a difference between the total weight of the car 1 and the weight of the counterweight 2, the car will be pulled toward the heavier side by one gravitational force, increasing the speed of the car, resulting in a very dangerous situation.

FIG. 1 shows an embodiment of the present invention, in which when the power supply of the power transmission device 7 is not normal, this is detected and the brake is operated.
Stop the elevator. A resistor 11 is connected in series with the power transmission device to the power supply circuit of the power transmission device 7.
1 voltage drop QS is the reference voltage Q of the reference voltage setting device 13
S is compared with the comparator 12, and if the reference voltage is abnormally high or below the reference voltage, an output signal is output, and this output signal invalidates the landing correction command. Turn off the correction contactor, operate the WJ control machine, and stop the elevator.

FIG. 2 shows another embodiment of the present invention, in which when the power transmission device 7 and its power source fail, the brake is operated to stop the elevator. A speed generator PG1. is connected to the input side of the power transmission device 7. A similar speed generator PG2 is installed on the output side, and each output voltage Q1 is proportional to the rotation speed.
The comparator 12 compares the voltage αS, which is the difference between

If the power supply of the power transmission device 7 or the power transmission device itself fails, the rotation speed on the output side of the power transmission device will be zero, or the rotation speed of the auxiliary electric motor 9 via the reducer 8, that is, the rotation speed of the power transmission device will decrease. The rotation speed on the input side is significantly lower than that on the input side. Therefore, the output voltages fl and Ω2 of each of the speed generators are Q13>flz, and the voltage difference Qs becomes large. When Qs becomes larger than the reference voltage QB, an output signal is generated from the comparator to notify that there is an abnormal condition, and this output signal invalidates the landing correction command, turns off the landing correction contactor, and turns off the brake. Operate and stop the elevator.

〔Effect of the invention〕

According to the present invention, it is possible to prevent the elevator from going into a free running state when the power transmission device fails, so it is possible to prevent the danger of abnormal acceleration of the elevator due to free running.

[Brief explanation of the drawing]

FIGS. 1 and 2 are block diagrams of an embodiment of the present invention, and FIG. 3 is a block diagram of a conventional elevator.纂I口 System 2 Diagram

Claims (1)

[Claims] 1. A main motor for driving an elevator, a power transmission device directly connected to the shaft of the main motor, and an auxiliary motor for assisting landing errors directly connected to one end of the power transmission device. An elevator control device, characterized in that the elevator drive device is provided with a function of operating a brake of the elevator when the power transmission device loses power transmission capability. 2. In claim 1, the loss of capacity of the power transmission device is determined by comparing the outputs of speed generators attached to the input side and the output side of the power transmission device, and the difference between the two exceeds a certain value. An elevator control device characterized by making a determination based on. 3. The elevator control device according to claim 1, wherein loss of capability of the power transmission device is determined by detecting the presence or absence of a power source of the power transmission device.