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Elevator device

A technology of elevators and elevator cars, which is applied in the direction of controlling electromechanical transmission devices, electrical components, transportation and packaging, and can solve problems such as synchronous motors not working

Inactive Publication Date: 2009-03-25
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the method of Conventional Technology 1 is aimed at the case where the motor driven by the power converter is an induction motor, and it does not work at all for synchronous motors.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] figure 1 Shown is an elevator device according to Embodiment 1 of the present invention. The elevator device is composed of a commercial power supply device 1, a main circuit unit 2 of a power converter, a control circuit unit 3 of a power converter, a motor 4, an elevator car 8, a counterweight 9, and The main sheave 10 and the sling 11 that the motor 4 is directly connected to constitute. The elevator car 8 is equipped with an emergency braking device 12 and moves up and down along guide rails 13 . In addition, in Embodiment 1, a power converter is constituted by a matrix converter, and the power converter can directly convert a three-phase AC input into a three-phase AC output, and each output phase of the main circuit part 2 of the power converter has three There are nine bidirectional switches 21 in total. The control circuit part 3 of the power converter calculates the bidirectional Drive signal for switch 21.

[0026] figure 2 with image 3 is a detailed d...

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Abstract

The invention provides an elevator device for avoiding the concentration of burden on part of semiconductor elements even when requiring high torque for a motor in such an almost stopped condition as in the operation test of an emergency stop device for an elevator. A power converter itself is changed from an inverter having two switching elements per one output phase into a power converter in such a system that three or more switching elements per one output phase are used for direct conversion from three-phase alternating current input into three-phase alternating current output. During the operation test of the emergency stop device, namely, in a period when the motor is operated at an extremely low speed in a constrained condition, the conducting condition of the semiconductor elements is controlled so that a actually effective value for a current flowing in the semiconductor elements constituting the same output phase is decentralized to be almost equal. The concentration of burden on part of the semiconductor elements is avoided during the operation test of the emergency stop device for the elevator, offering advantages that the semiconductor elements having small load bearing capacity constitute the power converter.

Description

technical field [0001] The present invention relates to an elevator device having a mechanism for controlling a motor through a power converter, and more particularly to an elevator device that, in the action test of an emergency braking device, when a relatively large output current flows through a specific When outputting the phase, drive the power converter so that the burden is not concentrated on some semiconductor elements. Background technique [0002] An emergency braking device is provided in the elevator device, and when the speed of the elevator car increases abnormally and exceeds a certain speed, the elevator car is braked by the emergency braking device. The emergency braking device requires regular operation tests. During the operation test, the motor, which is basically in a stopped state, is operated to output high torque. At this time, it is necessary to flow a large current through a specific output phase of the power converter, and this causes a load to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66B1/30B66B5/00H02P6/08B66B1/00H02P21/04H02P23/03H02P27/16
Inventor 绫野秀树稻叶博美大和育男大沼直人藤野笃哉
Owner HITACHI LTD
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