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Power supply for AC elevator

A technology for power supply devices and elevators, which is applied in battery circuit devices, circuit devices, and output power conversion devices, etc., can solve problems such as being difficult to implement, difficult to design rectifier circuits or batteries, etc.

Inactive Publication Date: 2008-07-30
FUJITEC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this power supply device, since a specific correspondence is required between the voltage fluctuation rate characteristic of the rectifier circuit for converting the AC output of the power supply into direct current and the voltage fluctuation ratio characteristic of the storage battery, it is difficult to design a system that satisfies this correspondence relation. The rectifier circuit or battery, so there is a problem that is not easy to realize

Method used

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  • Power supply for AC elevator
  • Power supply for AC elevator
  • Power supply for AC elevator

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0038] in such as figure 2 The hoisting device 82 driven by the induction motor IM shown is wound with a cable 83, and one end of the cable 83 is connected to the elevator cage 8, and at the same time, the other end of the cable 83 is connected to the balance weight 81.

[0039] AC power supplied from commercial power supply 1 is converted into DC power by converter 2 and then input to inverter 3 for conversion into AC power, and the AC current output from inverter 3 is supplied to induction motor IM.

[0040] Inverter 3 consists of figure 2 shown in the well-known PWM control circuit control. That is, in the induction motor IM, a pulse generator PG for detecting the actual speed of the elevator cage 8 is installed, and the speed command 4 for the elevator cage 8 and the output signal of the pulse generator PG are supplied to the speed regulator 5 to generate a speed deviation signal. This speed deviation signal is supplied to a variable frequency current command computin...

no. 2 Embodiment

[0069]This embodiment has the same structure as the first embodiment as a basic structure, and also has a structure for resetting or presetting the capacity gauge by maintaining the battery pack in a charged or discharged state under predetermined conditions.

[0070] That is, in the control system shown in FIG. 4, in the state where the charging prohibition switch S3 is set to off, every predetermined time, for example, 1 hour, from setting the charging and discharging permitting switch S2 to on, to Set the discharge prohibition switch S1 to the off state, switch to set the charge and discharge permit switch S2 to off, set the discharge prohibition switch S1 to the on state, and set the limit value of the discharge side to 0 , to maintain the battery pack E in a charging state (charging mode). The charging mode can also be set while the elevator is stopped.

[0071] As a result, the battery pack E is fully charged until the terminal voltage of the battery pack E becomes suff...

no. 3 Embodiment

[0077] The present invention has the same structure as the first embodiment as a basic structure, and also has the ability to eliminate the charge amount of each single cell constituting the battery pack by boldly maintaining the battery pack in a charged or discharged state under predetermined conditions. Discrete structure.

[0078] In this embodiment, a battery pack E is composed of a plurality of units composed of eight single cells B shown in FIG. An A / D converter 32 for converting the output signal of the amplifier into a digital signal; a microcomputer 33 for turning on / off the switches S1 to S3 shown in FIG. 4 according to the voltage values ​​V1 to Vn obtained from the A / D converter 32 . The microcomputer 33 monitors the voltage values ​​V1~Vn, and when a dispersion (for example, about 0.4V) exceeding the threshold occurs on these voltage values ​​(for example, about 9.6V), the charging and discharging permission switch S2 shown in FIG. 4 is turned on, and the discha...

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Abstract

An AC elevator comprises power line (1), an inverter (3) operated by the power line (1) to generate AC power, and an electric motor driven by the AC power from the inverter (3). A power supply includes a rechargeable battery (E), a power circuit (10) for charging and discharging the battery, and a control circuit (9) for controlling the operation of the power circuit (10) to control the input voltage to the inverter (3). The power regenerated by the electric motor charges the battery (E), which in turn drives the inverter (3).

Description

technical field [0001] The present invention relates to an improvement of a power supply unit of an AC elevator. Background technique [0002] Generally in the elevator, the Figure 16 As shown, while one end of the cable 83 wound around the lifting device 82 is connected to the elevator cage 8, the other end is connected to the structure of the balance weight 81, and the weight of the balance weight 81 is adjusted so that the weight of the balance weight 81 is 40 to 50% of the rated load. Balanced under load. [0003] With the advancement of power electronic components and technologies for controlling these components in recent years, the inverter 3 shown in the figure provides AC power of variable voltage and variable frequency to the induction motor of the hoisting device 82 to make the elevator cage 8 go up and down. Stream-driven approach is being practical. [0004] In the elevator of variable current drive mode, when the cage is fully loaded and ascends or the cage ...

Claims

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Application Information

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IPC IPC(8): H02J7/34H02J9/06B66B1/06B66B1/34H02P3/18B66B1/30H02J7/00H02M3/158
CPCH02J9/062H02J7/0072H02J7/0047H02M3/1582B66B1/30H02J7/005H02J7/007182H02J7/34
Inventor 冈田隆夫吉野义知盐出一洋长谷川和则村上新一长茂
Owner FUJITEC CO LTD
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