Door Drive Position Encoder With Independent Energy Store
Solution Overview
Problem
Existing electrical door drive systems with position encoders lose information about the door's absolute position when disconnected from the electricity supply grid, requiring a lengthy initialization process upon reconnection, which leads to additional energy consumption and unacceptable behavior.
Innovation Solution
Incorporating an energy store to independently supply the position encoder unit with power, allowing it to detect changes in the door's position during disconnection and reconnection, and using a low-power encoder and intelligent sampling management to minimize energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the drive system is disconnected from the electricity supply grid to save energy, then energy consumption is reduced, but the position encoder unit loses power and cannot detect door position changes
Solution Approach 1:
The system is divided into two independent power supply segments: the main drive system connected to the grid and the position encoder unit with its own energy store. This segmentation allows the encoder to maintain position detection capability independently while the main system can be disconnected for energy saving.
Solution Approach 2:
The energy store is pre-charged during grid-connected operation to store sufficient energy for maintaining encoder functionality during grid disconnection. This preliminary energy accumulation enables the encoder to continue detecting position changes even when the main drive system is powered down.
2Measurement precision
If the door is reinitialized after grid disconnection to restore position information, then position accuracy is restored, but additional energy consumption and time loss occur
Solution Approach 1:
Position information is continuously recorded and stored in the energy store's memory during grid-connected operation. This preliminary data accumulation eliminates the need for reinitialization after disconnection, as the encoder can resume using the stored position information immediately upon reconnection.
Solution Approach 2:
The energy store acts as an intermediary that preserves position information during grid disconnection. It bridges the gap between grid-connected and grid-disconnected states, allowing seamless resumption of accurate position detection without requiring reinitialization sequences.
3Reliability
If the encoder operates continuously to maintain position information, then position tracking is maintained, but energy consumption increases
Solution Approach 1:
The encoder operates periodically rather than continuously, utilizing the energy store's stored energy during grid disconnection periods. The encoder can be activated at intervals to update position information while consuming minimal energy from the stored source, rather than requiring continuous power supply.
Solution Approach 2:
The encoder's operational state is dynamically adjusted based on grid connection status. During grid connection, the encoder uses main power supply; during disconnection, it switches to energy store power. This dynamic adaptation optimizes energy consumption while maintaining position tracking reliability.
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 significant energy savings by eliminating the need for reinitialization and maintaining accurate door position tracking, reducing standby power consumption and improving user experience.
Implementation Method 1
an energy store (6) for independently supplying the position encoder unit (4) with electric power
Data Source
AI summary
To improve the energy efficiency of electrical drive systems for doors, the electric motor is actuated position-dependently, the electrically driven door is disconnected from the supply network in a resting position, a change of position of the door performed in the state of being disconnected from the grid is detected by a position encoder unit that is independently supplied with power by an energy store, and the change of position is used for position-dependently actuating the electric motor after the supply voltage has been reapplied.