JPH0632553A - Elevator device - Google Patents

Abstract

PURPOSE:To enable the change of the automatic landing speed at the time of electrical interruption to the rated speed, and shorten the time for rescuing passengers by providing an auxiliary inverter device, which converts the direct current power source for emergency to the alternating current at the time of electrical interruption and supplies the output thereof to the alternating current side of a converter and a transformer. CONSTITUTION:At the time of ordinary operation, the single-phase alternating current power is supplied from a commercial single-phase alternating current power source 30 to a converter 40, and this single-phase alternating current power is rectified to the direct current output by the converter 40. This direct current output is converted to the three-phase alternating current having a variable voltage and a variable frequency by a main inverter 50 to be controlled by a control circuit 70, and is supplied to an induction motor 60. On the other hand, in the case where the power source 30 is interrupted, an auxiliary inverter device 90 is driven by the de-energization of a contactor 10, and the output of a battery 80 is converted to the single-phase alternating current having the rectangular waveform. When a contactor 20 is energized, the alternating current output by the battery 80 is supplied to the alternating current side of the converter 40 and a controlling transformer 75, and the induction motor 60 is driven by the output of the converter 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator apparatus having an automatic floor landing operation function during a power failure, and more particularly, to an elevator for controlling power supply during a commercial power failure and an elevator traveling speed during a power failure automatic landing operation. Regarding the device.

[0002]

2. Description of the Related Art A conventional elevator apparatus having an automatic landing operation function during a power failure, as disclosed in Japanese Patent Laid-Open No. 59-217577, supplies a control power source at the time of a power failure of a commercial power source by an auxiliary inverter output, The power supply was directly supplied from the emergency DC power supply. A battery is used for the emergency DC power supply for reasons such as economy, and the number of batteries used is small. Therefore, the input DC voltage to the main inverter of the above main circuit is lower than that of the commercial power supply,
Since the voltage applied to the induction motor driving the elevator is also low, the traveling speed of the elevator is limited to about 1/10 of the rated speed. by the way,
In a domestic elevator, the traveling speed is usually 12 m / mi.
Although it is operated at the rated speed of n, it becomes a very slow speed of about 1/10 of the rated speed, that is, about 1.2 m / min at the time of power failure of the commercial power supply. This is too slow to rescue passengers in the event of a commercial power outage, which makes passengers anxious. Also,
Usually, three-phase alternating current is used for the commercial power source, so that the auxiliary inverter has a complicated structure for generating three-phase alternating current.

[0003]

As described above, in the conventional apparatus, since the emergency DC power source is directly supplied to the main circuit,
The rotation speed of the induction motor, that is, the traveling speed of the elevator, is limited by the voltage of the emergency DC power supply, and therefore, especially in a low rated speed elevator for home use, etc., the automatic landing operation speed during power failure becomes too low, There is a problem that it is not practical. Further, since there are a plurality of power supply systems and the auxiliary inverter is configured to generate three-phase alternating current, the device becomes complicated. An object of the present invention is to facilitate power supply during a commercial power failure and to variably control an elevator traveling speed during an automatic landing operation during a power failure to a rated speed during a commercial power operation.

[0004]

The above object is to provide a circuit configuration in which a single-phase AC power supply is used as a main circuit power supply and a control circuit power supply in an elevator apparatus, and an emergency inverter DC power supply is equivalent to a commercial power supply by an auxiliary inverter when a power failure occurs. This can be achieved by converting to a single-phase rectangular wave alternating current and supplying it to the main circuit power supply and the control circuit power supply all at once.

[0005]

In general, the speed control of the induction motor by the inverter is performed by V / f control which keeps the ratio of voltage to frequency constant. Limit the upper limit of. Therefore, during a power failure, the auxiliary inverter converts the emergency DC power supply into a single-phase rectangular wave AC equivalent to a commercial power supply, and controls the input voltage of the main inverter to be approximately the same as when a commercial power supply is used. The floor operating speed can be changed to the rated speed. Further, the output of the auxiliary inverter device is collectively supplied to the main circuit power supply and the control circuit power supply, and the power supply system at the time of power failure is simplified to one system.

[0006]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an embodiment of the present invention and shows a circuit configuration of an elevator apparatus. In FIG. 1, the commercial single-phase AC power supply 30 is
It is a single-phase three-wire system used for home use, and supplies electric power to the converter 40 and the control circuit transformer 75 via the contactor 10 that is energized when commercial power is supplied. The main inverter 50 is a converter that converts the direct current output of the converter 40 into a three-phase alternating current having a variable voltage and a variable frequency, drives the induction motor 60, and operates the riding basket 65. The output of the control circuit transformer 75 supplies power to the control circuit 70, and the control circuit 70 controls the main inverter 50. At the same time, the charger 85 converts the single-phase AC power supply 30 into DC, and the battery 8
Charge 0. The auxiliary inverter device 90 uses the battery 8
The output of 0 is converted into a rectangular wave single-phase alternating current, and power is supplied to the alternating current side of the converter 40 and the control transformer 75 via the contactor 20.

In the inverter device of this embodiment, normally, single-phase AC power is supplied from the commercial single-phase AC power supply 30 to the converter 40, and is rectified into a DC output in the converter 40. The control signal converts this DC output into a three-phase AC with a variable voltage and a variable frequency, and drives the induction motor 60. Riding basket 65
Is driven by this induction motor 60. At the same time, the single-phase AC power of the commercial single-phase AC power supply 30 is supplied to the charger 85, and the charger 85 converts the single-phase AC power 30 into DC and charges the battery 80. Further, electric power is supplied from the commercial single-phase AC power supply 30 to a circuit load such as lighting. on the other hand,
When the commercial single-phase AC power supply 30 fails, the contact 10 is deenergized and the auxiliary inverter device 90 is activated by the control signal of the control circuit 70. The auxiliary inverter device 90 converts the output of the battery 80 into a rectangular-wave single-phase alternating current, and when the contact 20 is energized, the output passes through the contact 20 and feeds the alternating current side of the converter 40 and the control transformer 75. To do. The output of the converter 40 is converted into a three-phase alternating current with a variable voltage and a variable frequency in the main inverter 50, and the induction motor 60
To drive the car 65. The output of the control circuit transformer 75 is supplied to the control circuit 70, and the control circuit 70 controls the main inverter 50. In this case, the control circuit 70 boosts the output voltage of the auxiliary inverter device 90 to approximately the same as the power supply voltage of the single-phase AC power supply 30. Since the converter 40 receives a voltage equivalent to the power supply voltage of the single-phase AC power supply 30 at the normal time, the riding basket 65 is variably and automatically operated on the floor in the range up to the normal elevator traveling speed or the rated speed. . Therefore, compared to the conventional elevator equipment, the automatic landing operation speed at the time of power failure is increased,
Shorten the rescue time for passengers in the car basket. In addition, the output of the auxiliary inverter device 90 is supplied to the AC side of the converter 40 and the control transformer 75, and the power supply system at the time of power failure is made one system. At the time of a power failure, the control circuit 70 controls the induction motor 60 to rotate in the light load direction and regeneratively operates the main inverter 50 to reduce the battery capacity and the auxiliary inverter device capacity.

FIG. 2 shows a circuit configuration of the auxiliary inverter device 90 inside FIG. In FIG. 2, when a start command is issued to the auxiliary inverter device 90, the auxiliary inverter control circuit 93 controls the auxiliary inverter transistor 91 to convert the output of the battery 80 into a rectangular wave single-phase AC equivalent to the commercial power frequency. At the same time, the output voltage of the auxiliary inverter device 90 is variably controlled. The output of the auxiliary inverter transistor 91 is stepped up by a step-up transformer 92 to a level equivalent to a commercial power source and output to the contactor 20. In the present embodiment, the single-phase AC power source is a 3-wire type, but it goes without saying that a 2-wire type configuration is possible.

[0009]

According to the present invention, the automatic landing operation speed during a power failure can be varied to the rated speed, and the rescue time of passengers in the riding basket can be shortened. In particular, it is useful in elevators with low rated speed, such as household ones. Further, since the output of the auxiliary inverter device is supplied to the AC side of the converter and the control transformer, the power supply system at the time of power failure can be simplified to one system. Further, the auxiliary inverter device can have a simple configuration of single-phase AC output.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an elevator apparatus according to the present invention.

2 is a circuit diagram of the auxiliary inverter device of FIG. 1, in particular.

[Explanation of symbols]

 10 Contactor energized during commercial power supply 20 Contactor energized during commercial power supply failure 30 Commercial power supply 40 Converter 50 Main inverter 60 Induction motor 65 Riding basket 70 Elevator control circuit 75 Control circuit transformer 80 Emergency DC power supply (battery) 85 Emergency DC Power Supply Charger 90 Auxiliary Inverter Device 91 Auxiliary Inverter Transistor 92 Step-up Transformer 93 Auxiliary Inverter Control Circuit

Claims (3)

[Claims] 1. A converter for converting a commercial AC power supply into a direct current, a main inverter for converting the converter output into a variable voltage / variable frequency AC, a control circuit for controlling the main inverter, and power supply by the main inverter. ,
An elevator device including an induction motor for driving an elevator, including an auxiliary inverter device that converts an emergency DC power supply into an AC during a power failure and supplies the output to a transformer connected to the AC side of the converter and the control circuit. An elevator device characterized by the above. 2. The invention according to claim 1, wherein the output voltage and frequency of the auxiliary inverter device are made substantially equal to those at the time of commercial power supply, and the elevator traveling speed during automatic landing operation during power failure is variably controlled to the rated speed. Elevator equipment. 3. The elevator apparatus according to claim 1, wherein a single-phase alternating current is used as a commercial power source, and the auxiliary inverter device outputs a single-phase rectangular wave alternating current.