Motorized Window Covering Stall Detection Without Manual Limits
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Solution Overview
Problem
Conventional window coverings face issues with damage due to resistance during operation, as they continue moving when encountering obstacles and require manual setup of upper and lower limits, leading to potential misalignment and increased inconvenience.
Innovation Solution
A window covering system with a control device that stops the motor when the moving speed of the lower end of the covering material decreases for a predetermined time, preventing further movement upon encountering resistance and eliminating the need for manual setup of limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor continues operating until receiving a stop command, then the covering material can be fully extended or retracted, but the covering material may damage blocking objects or become misarranged when encountering obstacles
Solution Approach 1:
The control device monitors the moving speed of the covering material in real-time and receives feedback when the speed decreases for a predetermined time, indicating an obstacle is detected. This feedback mechanism automatically adjusts the motor operation to stop, preventing damage to blocking objects while maintaining operational completeness.
2Measurement precision
If manual setup of upper and lower limits is performed, then the motor can stop at correct positions, but additional preparation time and potential information deviation occur
Solution Approach 1:
The system performs self-calibration by automatically detecting the upper and lower limits through speed monitoring during initial operation. The control device identifies limit positions when the covering material reaches extreme positions and automatically stores this information, eliminating the need for manual setup and reducing information deviation over time.
Solution Approach 2:
The system performs preliminary automatic calibration during the first operation cycle to establish upper and lower limit positions before normal use begins. This preliminary action stores position information in advance, eliminating the need for manual setup and ensuring accurate positioning from the start.
3Reliability
If the covering material stops when speed decreases, then damage is prevented, but the system requires speed monitoring and automatic stop control
Solution Approach 1:
The control device performs multiple functions: it controls motor operation, monitors covering material position, detects obstacles through speed monitoring, and automatically adjusts operation parameters. This multi-functionality consolidates what could be separate complex components into a single integrated control system, managing complexity while maintaining reliability.
Data Source
AI summary
A window covering includes a headrail, a covering material located below the headrail, a rotating member connected to the covering material and provided in the headrail, a motor provided in the headrail and coupled to the rotating member, and a control device provided in the headrail and electrically connected to the motor. The headrail has a longitudinal direction. The rotating member is adapted to drive the covering material to expand or collapse. The motor drives the rotating member to rotate. When a moving speed of a lower end of the covering material decreases and such a situation lasts for a predetermined time, the control device controls the motor to stop operating. Whereby, no matter whether the covering material is fully expanded, fully collapsed, or encounters resistance somewhere in between, the motor can be stopped.