JPS58212575A - 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 The present invention relates to an elevator control system, and more particularly to an elevator control system suitable for operating an elevator during a power outage or power system failure.

First, we will explain the conventional method of operating an elevator in the event of a power outage or power system failure using Figure 1.In an elevator using a motor generator, the elevator is connected to the IA and the counterweight 2A via a rope. Sheave 3A supported by
It is composed of a DC motor 4A that drives the sheave 3Ae, a DC generator 5A electrically connected to the DC motor 4A, and an induction motor 6A mechanically directly connected to the DC generator 5A.

In normal times, by supplying AC power to the induction motor 6A, the induction motor 6At- is driven to drive the DC generator 5A. And DC motor 4A, DC power generation +'fi5A
DC motor 4A by excitation of fields 7A and 8Ae
The elevator is driven by rotating it by t.

However, in the event of a power outage or power system failure, the induction motor 6A loses power, making normal operation impossible and causing a so-called canned car accident in which passengers are trapped in the car IA.

If a power outage occurs during elevator operation, the induction motor 6A and DC generator 1! Since the machine 5A continues to rotate for a certain period of time due to inertia, the rotation is used for this inertia to excite the field 7A of the DC electric motor 4A△ and the field 8A of the DC generator 5A using the emergency power supply 12. This makes it possible to operate the elevator and rescue passengers.

However, in this method, the rotation of the induction motor 6A and the DC generator 5A, which are the driving sources for the four DC motors, is limited, so there is a limit to the operating time of the elevator.

Therefore, in the past, in order to further extend the operating time, an auxiliary motor 9A was directly connected to the induction motor 6A.
A is driven by the emergency power source 12 to compensate for the decrease in rotation of the DC generator 5A. IOA and IIA are contacts that are turned on in the event of a power outage or the like.

The conventional system is configured as described above, and as shown in Figure 1, even when there are multiple elevators (the same as above, B is added instead of A, such as IB to IIB). ) Rescue operation is possible using a small-capacity emergency power supply 12, but it is necessary to drive the DC generator 5A with the auxiliary motor 9A when the rotation speed of the DC generator 5A is very low or after it has stopped. Then, a large current must be supplied from the emergency power supply 12 to the auxiliary motor 9A. As a result, other elevators may become unable to operate.

The present invention has been made in view of the above, and an object of the present invention is to provide an elevator that can always perform rescue operation reliably using a relatively small capacity emergency power source in the event of a power outage or power system failure. All control equipment is to be provided.

The present invention is characterized by a rotation detection means that detects the entire rotation state of the motor generator, and when the output of this rotation detection means decreases to a predetermined value, the circuit is closed to supply power to the collection motor from the emergency power supply. The present invention has a configuration including a switch means.

The present invention will be explained in detail below using the embodiment shown in FIG.

FIG. 2 is a diagram showing the configuration of essential parts of an embodiment of the control device according to the present invention. In Figure 2, 4A is a DC motor, 5A is a DC generator electrically coupled to the DC motor 4A, 6A is an induction motor mechanically directly coupled to the DC generator 5A, and 9A is a direct current motor coupled to the induction motor 6A. The auxiliary motor 13A is a voltage detection relay that is electrically connected in parallel with the auxiliary motor 9A.When the auxiliary motor 9A rotates, the auxiliary motor 9A generates electricity, and the generated voltage is proportional to the rotation speed. By setting the operating voltage of the voltage detection relay 13A to a certain constant value in advance, the rotation of the auxiliary motor 9A, that is, the rotation of the induction motor 6A and the DC generator 5A, can be prevented from occurring due to a power outage or power system failure. 14A is an auxiliary motor drive switch that is turned on when the voltage detection relay 13A is activated.
When the auxiliary motor 9A is turned on, power is supplied from the emergency power source 12 to the auxiliary motor 9A, and the auxiliary motor 9A is driven to compensate for the decrease in rotation of the DC generator 5A. Therefore, rescue operations such as during a power outage can be performed reliably. Moreover, power is supplied to the auxiliary motor 9A from the emergency power supply 12 when the voltage detection relay 13A is activated, that is, when the DC generator 5A and the induction motor 6A are still rotating at a considerable speed. The current flowing from the emergency power source 12 to the auxiliary motor 9A is reduced, and even if the capacity of the emergency power source 12 is relatively small, rescue operations of other elevators will not become impossible.

In the above-mentioned implementation series, the generated voltage ft of the auxiliary motor 9A is detected by the voltage detection relay 13A, but it is also possible to detect the rotation speed of the DC generator 5A or induction motor 6A. Needless to say.

As described above, according to the present invention, there is an effect that rescue operation can always be performed reliably using a relatively small capacity emergency power source in the event of a power outage or power system failure.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of a conventional elevator control system, Figure 2 is an explanatory diagram of a conventional elevator control device;
The figure is an explanatory diagram of essential parts showing an embodiment of an elevator control device of the present invention. 4A...DC motor, 5 people...DC generator, 6A...
...Induction motor, 9A...Auxiliary motor, 12...Emergency power supply, 13λ-...Voltage detection relay, 14A...
Auxiliary motor drive switch. sheep eye

Claims (1)

[Claims] 1. In a control device that operates an elevator by driving an auxiliary motor directly connected to a motor generator using an emergency power source in the event of a power outage or a failure of the power supply system, a rotation detection device that detects the rotational state of the motor generator. and a switch means for closing the circuit and supplying power to the auxiliary motor from the emergency power source when the output of the rotation detecting means decreases to a predetermined value. .