JPS58193875A - Operating device in case of emergency of alternating current 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 This invention relates to the numerical value of iIt for operating an elevator driven by an AC motor in an emergency. Instead of conventional primary voltage control, it has been proposed to adopt primary frequency control, which is efficient and allows regenerative braking.

In this -order frequency control, when the motor is in braking operation (
For example, when the car is under a heavy load or when the car is under a light load), the electric motor becomes a generator 1E, and regenerated power is generated and returned to the power source. Therefore, compared to primary voltage control in which braking energy during braking operation is consumed inside the motor, it has the advantage of extremely low power consumption.

On the other hand, when the elevator power is lost due to a power outage,
The electric motor is operated by an emergency generator.

However, a diesel generator used as an emergency generator can only absorb regenerative power of 10 to 5% of its rated output. Therefore, in order to generate one regenerated power, it is necessary to use an emergency generator with a large capacity. In particular, when the motor is controlled by primary frequency control, the efficiency is higher and the regenerative power is greater than by voltage transmission control, so an emergency generator with a correspondingly larger capacity is required.

This invention is intended to improve the above-mentioned problems, and during emergency operation,
To provide an emergency operation command for an AC elevator that can reduce the capacity of an emergency generator by blocking power regeneration to a power source and absorbing it by a load.

Hereinafter, an embodiment of the present invention will be described with reference to Figure 1 of a kite, in which a voltage source inverter is used for primary voltage control and control of a tortoise mower.

In the figure, R, 8, and T are two-phase AC power terminals, (1) is a converter that is connected to power terminals R, 8, and T and converts AC to DC, and (2) is connected to the DC terminal of converter (1). (3) is a frequency control device consisting of an inverter that converts the output of filter (2) into alternating current and has a frequency fIIJ11; (41 is a frequency control device (
3) is a three-phase induction motor driven by the electric motor (4), (6) is the drive sheave of the hoist driven by the electric motor (4), (6) is the main rope hung on the sheave 11i1, and i711181 is the main rope. Cable (a cable connected to both ends of the button and a matching weight, (
9) is a regenerative inverter connected to both ends of 110 and converts DC to AC, (1111 is a load consisting of a resistor that absorbs regenerative power, and (lla) is an emergency generator (1111) connected in series with the load QO+. an emergency power magnetic contactor contact that closes when a voltage (not disclosed) is established, (llb);
is an emergency power electromagnetic contactor contact which is inserted into the DC side of the regenerative inverter (9) and opens when the voltage of the emergency generator is established.

Next, the operation of this embodiment will be explained.

Under normal conditions, power terminals R, B, and T are connected to a commercial AC power source. Also, the electromagnetic contactor contact (lla) for emergency power supply
is open and the contact (in) is closed.The DC voltage is collected by the 0 converter (RI) and smoothed by the filter (2), and is applied to the frequency control device (3). Tuna*1B+ outputs AC voltage whose frequency is controlled according to the running command.This AC*, 1 voltage is supplied to the electric motor (4
), and the 1111 runs on the sheave (through the sheave 61) and the counterbalance 4. Note that during regenerative braking of the electric motor (4), the regenerative power is applied to the IiL of the frequency control device (3).
This occurs on the downstream side, but at this time, the regeneration inverter 111
+ is activated and the regenerated power is returned to the power source.Next, when the commercial AC power supply fails, the emergency AC generator is driven. When that voltage is established, power terminals R, 8, and T are disconnected from the commercial AC power source and connected to the emergency alternator. At the same time, an emergency operation command is issued, and the emergency power supply electromagnetic contactor contact (l1m) closes and the same contact (llb) opens. Now, when the heel (7) is driven by an emergency operation command, the regenerative converter (9) is disconnected and the load is connected instead, so the electric power during regenerative braking is transferred to the emergency alternator. It does not return to , but is consumed in negative 1h-. As a result, the emergency alternator does not need to absorb regenerated power, and its capacity can be small.

Figure 2 shows another embodiment of the invention.

In the figure, On is the output voltage of the converter (11) and the filter (
2) (circuit omitted), filter (2)
) is a braking detection electromagnetic contactor contact that closes when a high output voltage is detected. Other than the above, the configuration is the same as in FIG. 1.

In other words, during braking during emergency operation, the contact (11a)
, Q2) are closed, so the regenerated power is consumed by the load. On the other hand, the contact (121) does not close during the forward operation (for example, when the car (TE) is raised with a heavy load or when the car is lowered with a light load). Therefore, during the emergency operation, the electric motor (
It is only necessary to supply the power required for the operation of the load (1).
Since it is not necessary to supply the power consumed by ω, it depends on whether the capacity of the emergency alternator can be reduced accordingly.

In this embodiment, braking operation is detected using a converter (凰).
Is it detected from the relationship between the output voltage of the filter (2) and the output voltage of the filter (2)?
])) It is preferable to detect it from the driving direction. In other words, when the car (7) is lowered under a heavy load or raised under a light load, the electric motor (4) is in braking operation, so this is detected! The contact (121) may be configured to close.

Also, during emergency operation, instead of connecting the load, part of the frequency control device (3) is used during braking operation to connect the electric motor (
It is also possible to apply a DC voltage to the motor (4) and operate the motor by applying a DC braking force, so that the regenerated power is consumed by the electric motor (4).

Furthermore, instead of connecting the load, the motor (4) may be operated by controlling the output frequency of the frequency control device (8) so that the motor (4) slips without generating regenerative power even when braking. In addition, in the embodiment, the case where a voltage-type inno-electrode was used as the -side wave number control device (3) of the electric motor (4) was explained, but it is also possible to use other primary frequency control devices. That is clear.

As explained above, in this invention, when the elevator turtle machine is driven by the regular AC generator via the frequency control device when the commercial AC power supply is lost, the power regeneration device is disconnected from the frequency control device and the regenerated power is absorbed instead. Since the emergency alternator does not need to absorb regenerated power, it is possible to reduce its capacity.

In addition, since the above load is connected during braking during emergency operation, there is no need to supply the power consumed by the above load during continuous operation, and the capacity of the emergency alternator can be reduced accordingly. can do 0

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a configuration diagram showing one embodiment of an emergency operation device for an AC elevator according to the present invention, and Fig. w42 is a circuit diagram showing another embodiment of the present invention. In Figure 0, which is a partial phase diagram, (1)... converter, (3)... frequency control device, (4)... three-phase induction motor, (7)...
...Elevator car, (9)...Regeneration inverter, αα...Load, (lla)...Magnetic contactor contact for emergency power supply (second contact), (11b)...Same left contact (First contact point) In addition, the same parts in the diagram are indicated by the same symbols.
Shin Kuzuno - (1 other person)

Claims (1)

[Claims] fi+ A converter converts the power of a commercial AC power supply into DC power, a frequency control device converts this into variable frequency AC power, and the converted AC power drives an AC moving plate. At the same time, the regenerated power of the motor is returned to the commercial AC power source through the power regeneration system, and when the commercial AC power source is lost, the AC generator is returned to the AC generator for use when the commercial AC power source is lost. When connected to a converter to operate the above-mentioned car in a non-percentage manner, the above-mentioned regenerated power is absorbed by 1
Negative direction with 6 functions, special arrangement for loss of source of the above commercial current transformation,
The force regeneration device is controlled by the above-mentioned constant number control.
c) An emergency operating device for an AC elevator, comprising: a contact point; and a second contact point for connecting the load to the DC side of the frequency control device when the bending AC 11 source is lost. (2) A converter converts the power from a commercial AC power supply to DC power, a frequency control device converts this into variable frequency AC power, and the converted AC power drives an AC motor to operate the car. At the same time, the regenerative power of the electric motor is supplied to the WitM father-current power source through the electric power regeneration device, and when the commercial AC power supply is lost, the non-utility AC #1 generator is connected to the above-mentioned controller overnight. A braking detection device that detects when the electric motor is in brake operation, a load that has a function of absorbing electric power, and the above power regeneration when the commercial AC power supply is lost. Contact point #1 disconnects the device from the frequency control device, and connects the load to the direct flLliI of the frequency control device when the brake detection device operates when the commercial AC power supply is lost. An emergency operation device for an AC elevator, characterized by having two contact points.