Swing Door Operator With Resistive Braking in Powerless Mode
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Solution Overview
Problem
Existing swing door operators face challenges in controlling the closing speed and torque in a powerless mode, making it difficult to meet stringent safety standards like EN 16005 and EN 1154, especially for fire doors.
Innovation Solution
A swing door operator that incorporates a permanent magnet DC motor for powered mode operation and a mechanical drive unit with a resistive device for powerless mode operation, allowing for energy storage and controlled current discharge, enabling precise control of door leaf speed without external power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical drive unit is used for powerless mode operation, then the door leaf can be moved without external power, but the control of closing speed and torque becomes difficult to tune
Solution Approach 1:
The patent applies parameter changes by introducing a resistive device with adjustable resistance values that can be tuned to control the closing speed and torque in powerless mode. The resistance parameter is modified to achieve different closing characteristics, allowing the system to meet various safety standards while operating without external power.
Solution Approach 2:
The resistive device acts as an intermediary between the mechanical drive unit and the door leaf, providing controlled electrical resistance that regulates the current generated by the motor during regenerative braking. This intermediary component enables precise control of closing speed and torque by dissipating or storing electrical energy.
2Power
If a permanent magnet DC motor is used for powered mode, then the door leaf can be moved with external power, but current generated during powerless mode needs to be limited
Solution Approach 1:
The patent converts the harmful effect of uncontrolled current generation during powerless mode into a beneficial feature by using the resistive device to manage this current. The current that would otherwise be wasted or cause energy loss is now controlled to provide adjustable closing speed and torque, turning a potential problem into a control mechanism.
Solution Approach 2:
The patent replaces purely mechanical control systems with an electromechanical system that uses electrical resistance to control the motor's behavior during regenerative braking. This substitution allows for more precise and tunable control of closing parameters compared to traditional mechanical mechanisms.
3Measurement precision
If resistive device is added for current limiting, then current control is improved, but device complexity increases
Solution Approach 1:
The resistive device serves multiple functions: it limits current during regenerative braking, controls closing speed, regulates torque, and can be tuned to meet different safety standards. This multi-functionality justifies the added component by providing several control capabilities within a single element.
Solution Approach 2:
The resistive device uses adjustable electrical resistance as a simple yet effective parameter to control multiple aspects of door operation. By changing just one electrical parameter (resistance), the system can achieve precise control over current, speed, and torque without adding complex mechanical 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
Enables accurate and power-efficient control of door leaf speed in both powered and powerless modes, ensuring compliance with safety standards and adaptive tuning for system drift over time.
Implementation Method 1
a permanent magnet DC motor that is arranged to move the door leaf at least from the second position to the first position in the powered mode
Implementation Method 2
The at least one resistive device is arranged to limit a current generated by the permanent magnet DC motor
Data Source
AI summary
Provided is a swing door operator (110) for moving a door leaf (120) between a first position and a second position. The swing door operator (110) is arranged to operate in a powered and a powerless mode and comprises a permanent magnet DC motor (310). The motor (310) is arranged to move the door leaf (120) at least from the second position to the first position in the powered mode. The swing door operator (110) further comprises a mechanical drive unit (320), arranged to move the door leaf from the first position to the second position in the powerless mode. In the powerless mode, at least one resistive device is electrically connected in parallel with the motor (310) and arranged to limit a current generated by the motor (310) in response to the movement of the door leaf (120) from the first position to the second position by means of the mechanical drive unit (320). A method for controlling the swing door operator is also provided.