Variable Damping Braking Mechanism for Movable Door Wings
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Solution Overview
Problem
Existing braking mechanisms for movable door wings often result in incomplete opening or bumping due to constant or velocity-dependent damping, which can be influenced by temperature and friction, and pose environmental and fire hazards with hydraulic fluids.
Innovation Solution
A braking mechanism featuring an electric motor operating as a generator with an evaluation and control unit that performs pulse width modulation of the motor current to provide variable damping, ensuring the door wing stops at the maximum opening angle without bumping, regardless of kinetic energy, by regulating the braking force based on kinetic energy, temperature, and other conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If constant or velocity-dependent damping is used in braking mechanisms, then the door wing opening process is simplified, but the door wing cannot stop precisely at the maximum opening angle and may bump or fail to open completely
Solution Approach 1:
The patent applies dynamics by transitioning from constant or velocity-dependent damping to variable damping that changes during the door wing opening process. The damping coefficient is dynamically adjusted based on the door wing's position and velocity, enabling precise stopping at the maximum opening angle while maintaining simple operation throughout the opening process.
Solution Approach 2:
The patent implements parameter changes by varying the damping coefficient as a function of position and velocity. This allows the braking mechanism to adapt its damping characteristics during operation, achieving both easy operation and precise positioning by modifying the damping parameter throughout the opening sequence.
2Force
If hydraulic fluid is used for damping, then damping force can be adjusted, but environmental contamination and fire hazards occur when the fluid escapes
Solution Approach 1:
The patent replaces the hydraulic mechanical damping system with an electromagnetic braking system. This substitution eliminates the need for hydraulic fluid while maintaining adjustable damping force through electromagnetic fields, thereby removing environmental contamination and fire hazards associated with hydraulic fluid leakage.
Solution Approach 2:
The patent converts the potential harm of hydraulic fluid leakage into benefit by adopting an electromagnetic system that inherently avoids fluid-related hazards. The electromagnetic braking mechanism provides the same damping function without the harmful side effects, turning the problem of fluid leakage into an opportunity for a cleaner, safer system.
3Force
If hydraulic damping is used, then damping can be adjusted, but the damping characteristics change with temperature and friction conditions
Solution Approach 1:
The patent implements feedback by using sensors to detect the door wing's position and velocity, then feeding this information back to the control unit. The control unit processes this data and adjusts the electromagnetic braking force accordingly, ensuring consistent damping characteristics despite temperature and friction variations.
Solution Approach 2:
The patent replaces temperature-sensitive hydraulic damping with temperature-insensitive electromagnetic damping. The electromagnetic system's damping force is determined by electrical parameters rather than fluid viscosity, eliminating the reliability issues caused by temperature and friction changes in hydraulic systems.
4Speed
If kinetic energy in the door wing is too high, then the door wing opens quickly, but the door wing bumps in the open position
Solution Approach 1:
The patent applies dynamics by implementing velocity-dependent damping that increases as the door wing approaches the maximum opening angle. This dynamic adjustment allows high opening speed during most of the travel while providing increased braking force near the end to ensure precise stopping without bumping.
Solution Approach 2:
The patent uses parameter changes by varying the damping coefficient based on velocity and position. The damping parameter is increased when velocity is high and the door approaches the maximum angle, enabling the system to handle high kinetic energy while maintaining precise stopping precision.
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 mechanism prevents bumping and ensures complete opening of the door wing under varying ambient conditions, maintaining precise control over the braking force to adjust for kinetic energy and environmental factors, thus avoiding incomplete opening or damage.
Implementation Method 1
an electric motor 14 operating as a generator, the at least one drive shaft of which is rotatable by a movement of the door wing and at the terminals of which a movement-dependent output voltage is produced
Implementation Method 2
a stop spring 12 which damps a manual opening movement of the door wing between a predetermined opening angle alpha L and a maximum opening angle alpha max with a constant first damping DF
Implementation Method 3
the evaluation and control unit 20 performs a pulse width modulation PWM of the motor current that cooperates with the output voltage and produces an effective braking sequence, generating a variable second damping DM
Data Source
AI summary
The invention relates to a braking mechanism (10) for a movable door wing (1) with an electric motor (14) operating as a generator, the at least one drive shaft of which can be rotated by a movement of the door wing (1), and at the terminals thereof, a movement-dependent output voltage is produced, which is applied to an evaluation and control unit (20), and a stop spring (12) which damps a manual opening movement of the door wing (1) between a predetermined opening angle and a maximum opening angle with a constant first damping, and a corresponding door with a braking mechanism of this type. In accordance with to the invention, the evaluation and control unit (20) performs a pulse width modulation (PWM) of the motor current cooperating with the output voltage and establishes an effective sequence of braking force, which generates a variable second damping of the opening movement of the door wing (1), so that the door wing (1), when released, stops upon reaching the maximum opening angle.