Elevator Car Brake Vibration Control
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Solution Overview
Problem
Elevator devices with traction type systems experience significant shaking due to the stretching and shrinking of main ropes, particularly in high-rise buildings, which affects ride comfort and can lead to resonance and collisions, and existing brake systems are inadequate to suppress these vibrations under normal operating conditions.
Innovation Solution
An elevator device equipped with a car brake controller that detects vibrations using a vibration detection device and generates a braking force to control the car brake device, thereby reducing the shaking caused by the main rope's stretching and shrinking, even under normal operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a brake device is provided to the car to prevent jumping and slacking during emergency stop, then safety is improved, but shaking of the car during normal operation cannot be eliminated
Solution Approach 1:
The brake device is designed to dynamically adjust its braking force based on real-time vibration detection. The vibration detection device continuously monitors car shaking, and the control unit adjusts the brake device's output accordingly, transforming the static brake system into a dynamic one that responds to operational conditions.
Solution Approach 2:
A feedback control system is implemented where the vibration detection device provides continuous information about car shaking to the control unit, which then adjusts the brake device's braking force in response. This closed-loop feedback mechanism enables the system to actively suppress shaking while maintaining safety functions.
2Length of moving object
If the main rope length is increased to accommodate large vertical travel distance, then elevator capacity is improved, but stretching and shrinking of the main rope increases causing shaking
Solution Approach 1:
The brake device acts as an intermediary element between the main rope and the car. It provides additional control and stabilization forces that mediate the effects of main rope stretching and shrinking, preventing these forces from directly causing harmful shaking of the car.
Solution Approach 2:
The system changes the tension parameter in the main rope by applying controlled braking forces. By dynamically adjusting the tension through the brake device, the system counteracts the natural stretching and shrinking of the long main rope, thereby reducing shaking.
3Object-generated harmful factors
If the hoisting machine drive control is used to suppress car shaking, then shaking reduction is possible, but control complexity increases and cannot suppress shaking under all conditions
Solution Approach 1:
The brake device is controlled based on vibration detection feedback, allowing it to automatically adjust its braking force without requiring complex external control systems. The system essentially controls itself through the feedback loop, reducing the need for sophisticated external control mechanisms.
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
The solution effectively reduces car shaking, enhancing ride comfort by actively controlling the braking force to manage the vibrations caused by the main rope's tension fluctuations, preventing resonance and potential collisions.
Implementation Method 1
a car brake device configured to apply a load to the car rails to control raising and lowering of the car
Data Source
AI summary
Provided is an elevator device including a main rope configured to support a car and a counterweight, a hoisting machine configured to be driven with the main rope wound therearound, a hoisting-machine controller configured to control the hoisting machine, a car brake controller configured to control a car brake device configured to apply a load to car rails to control raising and lowering of the car, and a vibration detection device configured to detect vibration of the car. When the vibration of the car is detected based on an output signal from the vibration detection device under a running state in which the hoisting-machine controller controls drive of the hoisting machine, the car brake controller controls the car brake device to generate a braking force until the vibration becomes smaller than a set value.