Elevator Door Capacitor Bank for Emergency Power
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Solution Overview
Problem
Elevator door operating arrangements require manual operation in emergency situations, such as power outages, necessitating an on-site operator familiar with rescue procedures to open car and landing doors, which is unsafe and inefficient.
Innovation Solution
A door operating arrangement with a DC bus connected to a capacitor bank providing a high voltage level (40-60 V) and high capacity, allowing the elevator car doors to be opened automatically even without mains power, enabling remote monitoring and operation via a remote-controlled switch, thus eliminating the need for high voltage supply lines and ensuring operation independence from power supply fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a DC power source with high voltage is used to drive the door motor, then the door can be opened automatically in emergency situations, but electrical safety issues arise
Solution Approach 1:
The patent changes the voltage parameter of the DC bus to a specific range (40-60V) that provides sufficient power for door operation while remaining below the 60V safety threshold. This parameter optimization allows the system to achieve automatic door opening capability without exceeding safe voltage levels, thus resolving the contradiction between reliability and safety.
2Use of energy by moving object
If a capacitor bank with high capacity is installed to store sufficient energy for door operation, then power independence is achieved, but device complexity increases
Solution Approach 1:
The patent divides the total capacitor bank into multiple individual capacitors connected in parallel. This segmentation approach achieves the required total energy storage capacity while distributing the physical components, which simplifies installation, maintenance, and replacement. Each capacitor can be independently handled, reducing the complexity of working with a single large-capacity component.
3Power
If the voltage level of the DC bus is increased to provide sufficient power for door operation, then door drive capability is improved, but safety barriers are exceeded
Solution Approach 1:
The patent optimizes the DC bus voltage parameter to operate at the maximum safe level (40-60V), which provides sufficient power for reliable door operation while maintaining compliance with safety standards. This precise parameter control allows the system to achieve high door drive capability without exceeding the 60V safety threshold.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables safe and automatic operation of elevator doors during emergencies, allowing remote monitoring and operation, reducing the risk of manual intervention and ensuring continued functionality even after power failure, with enhanced safety and reduced electromagnetic noise.
Implementation Method 1
the DC bus is connected to a capacitor bank located in the elevator car having a parallel connection of at least two capacitors and a total capacity value of at least 75.000 μF, preferably at least 100.000 μF
Data Source
AI summary
A door operating arrangement in an elevator, including a door operating unit located in the elevator car including a door controller and a door drive as well as a door motor configured to open and close elevator car doors, optionally together with elevator landing doors, a DC bus connecting the door operating unit via a travelling cable of the elevator car with a DC power source of the elevator. The voltage level of the DC bus is between 40 V and 120 V, the DC bus is connected to a capacitor bank located in the elevator car having a parallel connection of at least two capacitors and a total capacity value of at least 75.000 μF, preferably at least 100.000 μF.