JPS6071477A - Controller for 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 [Technical Field of the Invention] The present invention relates to a control device for an AC elevator.

[Prior art]

In recent years, inverters have come to be used to control elevator drive motors for purposes such as reducing power consumption. A specific example is shown in FIG.

In this figure, 1 is a three-phase AC commercial source, 2 is N
FB, 3 is a normally open contact of a contactor that is excited when the elevator is running; 4 is a converter that converts three-phase AC voltage into DC voltage; It is connected to a three-phase AC commercial power supply l.

The output of the converter 4 is smoothed by a capacitor 5, and a DC voltage is applied to an inverter 6. The inverter 6 converts this DC voltage into a variable voltage, variable frequency three-phase AC voltage, and its output is supplied to an induction motor 7 for driving the elevator.

Further, a resistor 8 and the collector and emitter of a transistor 9 are connected in series between the input terminals of the inverter 60.

This resistor 8 and transistor 9 are for consuming the regenerated power of the induction motor 7 for driving the elevator.

The transistor in the inverter 6 and the transistor 9 for regenerative power consumption are controlled by a control circuit 10. The control circuit IO includes a three-phase transformer 11 and an NFB
Power is also supplied from a three-phase AC commercial power source 1 via 2.

Further, an input end of a rectifier 12 is connected between the NFB 2 and the common contact 3, and an output end of the rectifier 12 is connected between the output ends of the converter 4 via a resistor 13.

The rectifier 12 and resistor 13 are used to charge the capacitor 5 to a predetermined voltage in advance in order to suppress the rush current when the normally open contact 3 is turned on.

In addition, as the power supply for the control circuit 10, generally a plurality of DC voltages with low ripple and relatively large current capacity are required, so a three-phase transformer ll'1 is used and the voltage is obtained from each sparrow wire on the secondary side. The three-phase AC voltage is three-phase full-wave rectified so that multiple DC voltages can be adjusted.

When the three-phase AC power supply 1 is secured, the AC power of the three-phase AC commercial power supply 1 is transferred to the NFB2. The normally open contact 3 is heated and applied to the converter 4, and the converter 4 converts this AC power into DC power, which is then cooled by a capacitor 5 and then applied to an inverter 6.

As a result, the inverter 6 generates an output of frequency and voltage according to the output of the control circuit 10 to control the rotation speed and torque of the induction motor #170 for driving the elevator. When regenerated,
The control circuit IO detects this, turns on the transistor 9, and causes the resistor 8 to consume regenerated power.

However, even when an elevator is installed, it is necessary to operate it in order to install equipment in the hoistway and landing area. However, at the time of installation, a three-phase AC commercial power supply is generally not installed, so the control of the configuration shown in Figure 1 is required. In order to operate the elevator with this device, it is necessary to prepare a three-phase alternating current generator as a temporary power source, which requires an arrangement fee.

There was a problem with the period.

[Summary of the invention]

This invention was made to solve the above-mentioned conventional drawbacks, and it is not necessary to prepare a three-phase AC temporary power source. This invention proposes a control device for an AC elevator that can operate the elevator.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the control device for an AC elevator according to the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram showing the configuration of one embodiment. In FIG. 2, in order to avoid duplication, the same reference numerals are given to the IS parts from the same old times as those in FIG.

Comparing this Figure 2 with Figure 1, it is clear that 5.
In the figure, parts indicated by 14 and after are newly added to the configuration of FIG. 1. That is, 14 is a single-phase AC power supply, and this single-phase AC power supply 14 is an NFB for single-phase AC power supply.
15 , it is connected to the connection point between the NFB 2 and the normally open contact 3 and to the input end of the rectifier 12 .

Further, the input end of an f-inverter 16 is connected to the output end of the converter 4. Inverter 16 is converter 4
The output of the DC voltage is converted into a three-phase AC voltage, and this three-phase AC voltage is supplied to the control circuit IO via the three-phase transformer 11.

The other configurations are the same as in FIG. 1.

Next, the operation of the AC elevator control device of the present invention configured as described above will be explained.

If three-phase AC commercial power supply 1 is secured, use NFB1.
5 is cut off, and a three-phase AC voltage is applied to the three-phase transformer 11 by the impark 16, so its operation is the same as in the case of FIG.

On the other hand, if three-phase AC commercial power supply 1 is not secured,
The NFB 15 is turned on and power is supplied from the single-phase AC power supply 14. This single-phase AC voltage is applied to a converter 4 via a normally open contact 3, where it is converted to a DC voltage, smoothed by a capacitor 5, and applied to an inverter 6.

This smoothed DC voltage is also applied to the inverter 16, and the inverter 16 applies its output to the three-phase transformer 11 of the control circuit 10 as a three-phase AC voltage to operate the control circuit io'g.

The inverter 6 and the transistor 9 for regenerative power consumption operate according to the output of the control circuit 10 to control the operation of the elevator.

According to the configuration shown in FIG. 2, the elevator can be operated at the time of installation using the single-phase AC power source 14 prepared as a power source for the welding machine at the time of installation, without having to prepare a three-phase AC temporary power source. Can be done.

FIG. 3 is a block diagram showing the configuration of another embodiment of the control device for an AC elevator according to the present invention. In this third figure,
In addition to the configuration shown in FIG. 2, parts indicated by reference numerals 17 onward are newly added.

That is, 17 is a battery for supplying electric power for driving the elevator during a power outage, 18 is an NFB for the battery, 19 is a normally open contact of a contactor that is energized when the elevator is running when the elevator is operated with battery power, and 20 is a diode for pre-charging the capacitor 5 to a predetermined voltage in order to suppress the rush current when the normally open contact 19 is closed.

The battery 17 is connected to the output terminal of the converter 4 and the input terminal of the inverter 16 via the NFB 18 and the normally open contact 19, and is connected to the diode 20 from the connection point between the NFRl 8 and the normally open contact 19. is connected to the output end of the rectifier 12 through.

Next, the operation of the embodiment of FIG. 3 constructed as above will be explained. If the single-phase AC power supply 14 (or three-phase AC commercial power supply 1) fails, DC voltage is supplied from the battery 17 to the INNO (-6) and INNO (-TA 16), allowing rescue operation at the time of a power outage. can be done.

That is, by simply adding the simple equipment 17 to the configuration shown in FIG. 2, rescue operation during a power outage is easily possible.

〔Effect of the invention〕

As explained above, according to the AC elevator control device of the present invention, a second inverter is provided that converts the voltage on the DC side of the inverter into a three-phase AC voltage, and its output is used as a power source for the control circuit of the main inverter. 5, it is not necessary to prepare a three-phase AC temporary power source during installation, and the elevator can be operated with a single-phase power source prepared as a welding machine power source. Emergency rescue operations are also easily possible with the addition of a battery.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional AC elevator control device, FIG. 2 is a block diagram showing the configuration of an embodiment of the AC elevator control device of the present invention, and FIG. 3 is a block diagram of the AC elevator control device of the present invention. FIG. 2 is a block diagram showing the configuration of another embodiment. l...Three-phase AC commercial power supply, 4...Converter, 6°16...Inverter, 7...Elevator drive induction motor, 9...Transistor, lO...Control circuit,
11... Three-phase transformer, 12°/° rectifier, 14°/
・Single-phase AC power supply, 17... battery. In addition, the same reference numerals in the diagram indicate the 14th part of the same square O. Agent Masuo Oiwa (2 others) Procedural amendment J: (spontaneous) Mr. Commissioner of the Japan Patent Office 1, Indication of the case 1; 58-174857 No. 2
, Title of the invention AC elevator control device 3, Relationship with the amended case ↑)'Applicant's address No. 13, 2-1 Marunouchi, Chiyoda-ku, Tokyo Name
(601) Hitoshi Katayama, Representative of Mitsubishi Electric Corporation, Part 5, Amendment (1) Features of specification ν1 i'l' Scope of claims column 6, Contents of amendment (1) Specifications) Features of 14 Correct the range of n'1ili'+ as shown in the attached sheet. 7. Attachment 1.1 Document (1) 1 containing the entire text of the amended scope of Patent a'1 claims
1:, and the special it'f' that describes the full text of the scope of claims after one amendment! 1rl! 2.Special i! Scope of requirements (1) A converter that converts three-phase AC commercial power into DC during normal times, converts the DC output from this converter into variable frequency AC power, and converts the DC output from this converter into variable frequency AC power,
11 inverters that drive the elevator; 2. A control circuit that detects and consumes the regenerated electric power of the induction motor for driving the elevator; and 1. Control that converts the DC voltage output from the converter into a three-phase AC voltage. l's2 that supplies power to the circuit
An inverter is a control circuit for an elevator that is equipped with a JIT-phase power supply that supplies AC power to fJ when a three-phase AC commercial power source cannot be supplied. (2) A battery is connected to the output of the converter. 1. A control device for an AC elevator according to claim 1, characterized in that the elevator is operated during a power outage by being connected.

Claims (1)

[Claims] (1) A converter that normally converts three-phase AC commercial power into DC; a first inverter that converts the DC output from this converter into variable frequency AC power to drive the induction motor for driving the elevator; A control circuit that detects and consumes the regenerated power of the induction motor for driving the elevator, a second inverter that converts the DC voltage output from the converter into a three-phase AC voltage and supplies power to the control circuit, and a three-phase AC voltage. A control circuit for an AC elevator comprising a single-phase power supply that supplies AC power to the converter when commercial power is not available. A control device for an AC elevator according to claim 1.