Braking Device for Movable Door Leaf Using Decoupled Generator
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Solution Overview
Problem
Conventional braking devices for movable door leaves generate a generator voltage that is proportional to the speed and direction of the door leaf, requiring a large voltage range in the charging circuit and necessitating additional components like rectifiers, which complicates the design and increases costs.
Innovation Solution
The generator shaft is mechanically decoupled from the door leaf's axis of rotation during voltage generation, using a separate mechanical energy storage device charged by the door's movement to provide a constant generator voltage, independent of speed and direction, allowing for a smaller voltage range in the charging circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the generator shaft is fixedly connected to the door leaf axis of rotation, then the generator voltage is proportional to the door leaf speed, but the voltage range becomes very large (up to 180V for fast opening) requiring complex charging circuit design
Solution Approach 1:
The system is divided into two separate functions: the mechanical energy storage device (spring) handles the door leaf movement and energy storage, while the generator is mechanically decoupled and only responsible for generating voltage at a constant speed. This segmentation allows the generator to operate independently from the variable door speed, producing a stable voltage that simplifies the charging circuit design.
Solution Approach 2:
The mechanical energy storage device acts as an intermediary between the door leaf and the generator. It absorbs the variability of door movement and transforms it into uniform rotational motion of the generator shaft, thereby mediating the connection between the door mechanism and the electrical generation system. This intermediary function ensures the generator receives consistent rotational input regardless of door speed variations.
2Ease of operation
If the generator shaft is fixedly connected to the door leaf axis of rotation, then the generator voltage depends on the direction of rotation, but this requires additional rectifier components in the charging circuit
Solution Approach 1:
The mechanical energy storage device serves as a mediator that decouples the directional dependency from the generator. It absorbs the directional variations in door movement and converts them into unidirectional rotation of the generator shaft, eliminating the need for rectifiers and simplifying the charging circuit.
Solution Approach 2:
Instead of allowing the generator to directly follow the door leaf's variable rotation direction, the system inverts the approach by using the mechanical energy storage device to enforce a fixed rotation direction on the generator shaft, regardless of the door's movement direction. This inversion eliminates polarity dependence.
3Productivity
If the generator shaft is fixedly connected to the door leaf, then the generator voltage varies with door speed, but this requires the generator winding to be designed for large voltage ranges
Solution Approach 1:
The system separates the speed control function (handled by the mechanical energy storage device and door mechanism) from the voltage generation function (handled by the decoupled generator). This segmentation allows the generator to be designed for a narrow, optimal voltage range while the door speed varies independently through the spring mechanism.
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
This solution ensures a substantially constant generator voltage, simplifying the design and reducing costs by eliminating the need for complex voltage regulation, while maintaining effective braking performance.
Implementation Method 1
having at least one generator, at the output terminals of which a generator voltage can be generated
Data Source
AI summary
A braking device for a movable door leaf according to the invention comprises at least one generator, at the output terminals of which, a generator voltage can be generated, by means of which a charging circuit for supplying an open-loop and/or closed-loop control unit may be charged, by means of which an electric braking device, such as, in particular, a braking motor or the like, is controllable, which generates an effective braking force for damping the movement of the door leafs. Therein, the generator shaft of the generator is rotatable for generating the generator voltage with the discharging of a mechanical generator energy storage specifically associated with the generator, which is charged by a respective opening or closing movement of the door, and, during a respective closing or opening movement of the door, is mechanically decoupled from the same or its axis of rotation, and discharges in the state mechanically decoupled from the door leaf or its axis of rotation. Further specified is a door closer, having a rotatable door closer axis, coupleable with a door leaf, cooperating with a mechanical door closer energy storage device, and a correspondingly designed braking device.