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Method of performing manual drive in elevator after main power is turned off

A manual drive, main power technology, used in transportation and packaging, elevators, etc., can solve problems such as expensive, automatic rescue operation is not feasible, and battery capacity is too large.

Active Publication Date: 2021-07-20
KONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this implementation can be more expensive, e.g. due to oversized batteries
On the other hand, in some cases, if a visual inspection of the lift is required, e.g. for safety reasons, an automatic rescue operation may not be feasible

Method used

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  • Method of performing manual drive in elevator after main power is turned off

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0099] Elevator 10 includes a motor drive 12 that drives an elevator motor 14 and a brake drive 16 that actuates two elevator brakes 18 . The motor drive 12 includes a frequency converter 20 having a rectifier bridge 22 , an intermediate DC link 24 and an inverter bridge 26 connected to the elevator motor 14 . In the DC link 24, a DC converter 25 is located between the rectifier bridge 22 and the inverter bridge 26 to boost the DC voltage to a level high enough for the inverter bridge 26 to operate. On the high side of the DC converter 25 an optional smoothing capacitor 27 is connected to reduce any voltage ripple in the DC link 24 at the input of the inverter bridge 26 . At least the inverter bridge 26 of the frequency converter 20 is controlled by a drive controller 28 . The motor driver 12 further includes a main relay 30 which may be activated by a manual drive controller 32 connected to the drive controller 28 or a manual emergency driver integrated therewith. A tachome...

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PUM

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Abstract

The invention relates to a method of performing a manual drive in an elevator after the mains has been switched off, comprising: a) separation of the frequency converter of the motor from the mains, b) inhibiting any safety blocking of the brake drive and / or the motor drive, c) current The brake driver is supplied from the battery to open the elevator brakes and current is supplied from the battery to the drive controller to allow regulation of the motor speed via the inverter bridge, d) The manual drive controller observes the motor speed through the speed sensor and activates the speed feedback loop to Motor speed is regulated by feeding three-phase AC current to the motor windings via the semiconductors of the inverter bridge to a manual drive reference, which is lower than the speed reference for normal elevator operation, e) floor indication when the car reaches a floor actuator is activated, and f) the actuator is released, then the current supply from the battery to the elevator brake is interrupted, and the previously disabled safety blocking of the brake drive and / or motor drive is enabled again.

Description

Background technique [0001] Situations can arise in elevators where the elevator car has been manually driven to the next landing, in most cases to free trapped passengers, but also for maintenance purposes. [0002] In a conventional elevator, a manual actuator such as a release lever or a button is actuated to allow the elevator to move to the next floor. For example, in the event of a mains power failure, the elevator car may stop between floors and automatic rescue operations (if provided) may fail; in this case, the service technician would need to move without mains power elevator car. [0003] Most elevators today have an elevator motor driven by a frequency converter with an inverter bridge that supplies current to the different motor windings. In such cases, dynamic braking is sometimes employed to limit the speed of the elevator car during manual drive. During this dynamic braking, it is generated when, for example, a permanent magnet synchronous motor (PMSM) rota...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66B5/02
CPCB66B5/027B66B1/32B66B5/0087B66B1/308B66B1/3492B66B5/028B66B5/044
Inventor J.尼坎德尔A.卡泰宁P.拉西纳
Owner KONE CORP