JPS59217577A - Drive on service interruption of 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 improvement in an elevator operation device during a power outage.

In recent years, inverters have been used to control elevator drive motors in order to reduce power consumption, but even in the event of a power outage, a battery can be connected to the DC side of the inverter to control the operation of the elevator during a power outage. It is suggested that driving be carried out.

A specific example is shown in FIG.

In the figure, (1) is a three-phase AC commercial power supply 9 (2) is a normally open contact of a contactor that is excited when the elevator is running, (3) is a converter that converts three-phase AC voltage to DC voltage, (4) is a capacitor that smoothes the output voltage of converter (3).

(5) is an inverter that converts DC voltage into variable voltage, variable frequency three-phase AC voltage; (6) is an induction motor for driving an elevator; +71. +81 is a resistor and transistor for consuming regenerative power from the electric motor (6), (9) is a control circuit that controls the transistor of the inverter (5) and the regenerative power consumption transistor (8), (In is a control circuit +91 three-phase transformer that supplies power to the
Batch 1Ju13 is the normally open contact of the contactor that is energized during a power outage, α row is a diode for supplying power from the battery to the inverter during a power outage, and α is the battery power supply + 11) used to operate the inverter (5) during a power outage. ) and a control circuit that controls the transistor (8);
+151°αe are the normally open and normally closed contacts of the relay, which are energized during a power outage, respectively.

In the above configuration, when the commercial power supply (1) is normal.

Contacts az and u51 are open and contact (18 is closed).

The inverter (5) generates a frequency and voltage output according to the output of the control device (9) to control the rotation speed and torque of the motor (6), and when electric power is regenerated from the motor (6), the control device 19+ detects this, turns on the transistor (8), and causes the resistor (7) to consume regenerated power.

Next, when the commercial power supply (1) is out of power, the contact (161) opens and the contact α (19) closes, so the inverter (5)
) on the DC side of the battery 1111 via a diode 0 row.
At the same time, the transistor of the inverter (5) and the transistor (8) are controlled by the control device 04) to control the motor (6) during a power outage.

However, in the configuration shown in FIG. 1, it is necessary to prepare two inverter control devices: a 19+ for commercial power supply and a circle for battery power supply, making the configuration complicated and expensive. In addition, to protect the inverter, it is usually necessary to have a circuit that detects overvoltage or overcurrent and stops inverter control, but this also requires two circuits, one for commercial power and one for battery power. Ta.

Furthermore, for fine-grained control of the inverter.

A large number of insulated power supplies and regulated voltage power supplies are required, and in the case of commercial power supplies, a large number of isolated power supplies are obtained from the transformer IIG, and a rectifier circuit and constant voltage built in the control device (9) are required. The necessary power is obtained by the circuit, but in order to control the inverter in the same way even in the event of a power outage, the control device α41K is also equipped with an isolated DC/DC converter and constant voltage circuit compatible with each of the above power sources. Requires a control device (
141 had a very complex structure.

The present invention solves the above-mentioned drawbacks, and aims to provide an elevator operating system during a power outage that does not require a particularly complicated inverter control device for operation during a power outage.

FIG. 2 shows an embodiment of the present invention.

In the figure, the parts indicated by the same reference numerals as in FIG. 1 indicate corresponding parts, and therefore their explanation will be omitted. 0ri is batch IJ 1
An inverter that converts DC voltage from 1υ to three-phase AC voltage (II is a contact that opens for a certain period of time after a power failure is detected,
(a) is inserted and connected to the front stage of the three-phase transformer l1l),
These are the normally open and normally closed contacts of the relay, which are energized during a power outage, respectively.

In the configuration of FIG. 2, the operation when the commercial power supply (1) is normal is exactly the same as that of FIG. 1. On the other hand, commercial power supply (1)
When there is a power outage, contact α is closed by power from an emergency standby power source, etc., and the output voltage of battery q11 is applied to the DC side of inverter (5) via diode α, and the DC voltage of inverter Uη is applied to the DC side of inverter (5). Batch Q111 on the side too
An output voltage of 1 is applied, so that the inverter αη generates a three-phase alternating current voltage. On the other hand, since the contact ■ is open and the contact α is closed, the three-phase AC voltage that is the output of the inverter αη is applied to the primary side of the transformer 1, and power is supplied to the control device A9). . Therefore, the control device +91
is the same as when the commercial power supply (1) is normal.
) and the regenerative power consumption transistor (8) to control the torque and rotational speed of the motor (6).

In addition, during the switching transition period when a power outage is detected and the contact - is opened and the contact α2°Ol is closed, the power supply of the control device ζ9) is in an uncertain state, so it is difficult to control the inverter (5) reliably. Failure to do so may cause a short circuit between the upper and lower arms of the inverter.
-Protective circuits such as the receding current detection circuit cannot operate reliably,
As a result, the inverter (5) may be damaged.

Therefore, in order to prevent the above problem, the output of the control device '91 is disconnected from the inverter (5) through contact (18) K for a certain period of time after a power failure is detected, and the output from the inverter αη is supplied to the control device! The output of the control device (9) is applied to the inverter (5) after the power supply of the control device (91) is sufficiently established.

Although the means for opening the contact (+81) for a certain period of time is not shown, it is possible to detect a power outage from a relay or the like, start a timer based on the detection operation, and have a contact α barrel for a certain period of time. is in the energized state (or in the de-energized state if contact f181 is the normally open contact of the relay)
All you have to do is do this. However, the mochi theory can also be applied to other configurations.

In the embodiment shown in Fig. 2, the contact (181) is set to open for a certain period of time after a power outage is detected, but the contact (181) is set to open when the power supply voltage of the control device [9] is detected and the power supply voltage is not within the normal range. It is clear that the same effect can be obtained even if

As described above, in the present invention, at the time of a power outage, battery power is supplied to the first inverter for driving the electric motor, and at the same time, the second inverter is provided to convert the power into alternating current, and this power is transferred to the first inverter. Since the inverter is used as the driving power source for the control device, the control device can be used both during normal times and during power outages, and the configuration of the power outage operation device can be simplified.

[Brief explanation of the drawing]

FIG. 1 is an electrical circuit diagram showing a conventional example, and FIG. 2 is an electrical circuit diagram showing an embodiment of the present invention. +31... Converter (51... First inverter (6)... Electric motor +9)... Control device FIG
...Transformer l1l)...Battery 0η...
・Inverter (181...Normally closed contact agent Masuo Oiwa

Claims (2)

[Claims] (1) A converter that rectifies a commercial AC power source and converts it into DC; a first inverter that converts the output of the converter into an AC voltage of variable voltage and frequency to control an induction motor for driving an elevator; a control device that controls the inverter No. 1; a transformer that supplies power to the control device; a battery that is connected to the DC side of the inverter during a power outage; and an inverter that converts the output voltage of the battery to AC. and a second inverter that operates the control device by supplying its output to the primary side of the transformer during a power outage. (2) a converter that rectifies a commercial AC power source and converts it into DC; a first inverter that converts the output of the converter into a variable voltage/variable frequency AC voltage to control an elevator driving induction motor; a control device that controls the inverter No. 1; a transformer that supplies power to the control device; a battery that is connected to the DC side of the inverter during a power outage; and an inverter that converts the output voltage of the battery to AC. In the event of a power outage, the output will be transferred to 1 of the above transformer.
a second inverter that supplies power to the next side to operate the control device; and a second inverter that is provided between the control device and the first inverter and outputs the output of the control device when the control device is established in a stable state. and means for supplying the first inverter to the first inverter.