Ceiling Fan Blade Breakage Detection and Retention System
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Solution Overview
Problem
Conventional ceiling fans experience stress concentration at the root portion of fan blades, leading to potential breakage, where even if a fan blade breaks, the fall prevention member retains it, causing continued rotation and increased safety concerns.
Innovation Solution
A ceiling fan design incorporating a DC motor, support part, fan blades, fall prevention member, controller, and measurer that automatically stops the motor when a fan blade breaks by controlling electric energization based on changes in current or rotation speed measured by the measurer, ensuring the blade is retained and preventing further rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fall prevention member is used to retain the fan blade when the root portion breaks, then the fan blade is prevented from completely detaching, but the fan blade continues to rotate causing safety concerns
Solution Approach 1:
The control unit receives feedback from the measurement unit about current or rotation speed changes, and automatically stops the motor when abnormal values are detected, resolving the contradiction by preventing continued rotation while maintaining retention
2Stability of the object's composition
If the motor continues to rotate after fan blade breakage, then the fan blade remains engaged with the support frame, but safety risks increase due to continued operation
Solution Approach 1:
The measurement unit continuously monitors motor operation parameters and provides feedback to the control unit, which automatically stops the motor when abnormal conditions are detected, thereby eliminating the safety risk while preserving the engagement state
3Object-affected harmful factors
If automatic detection and stopping mechanisms are added to the ceiling fan, then safety is improved by stopping the motor when blade breakage occurs, but device complexity increases
Solution Approach 1:
A measurement unit monitors motor current or rotation speed and provides feedback to a control unit that automatically stops the motor when abnormal values are detected, improving safety through relatively simple additional components
Solution Approach 2:
The system uses the motor's own operational parameters (current or rotation speed) as indicators of blade integrity, allowing the motor system to self-diagnose and self-stop without requiring external complex detection mechanisms
Data Source
AI summary
A fan blade includes a blade body blowing air and a root portion secured to a support part. A first end part of a fall prevention member is attached to a first mount portion provided in the support part, and a second end part of the fall prevention member is attached to a second mount portion provided in the blade body. A controller controls electric energization to a DC motor to cause the fan blade to stop rotating when the fan blade breaks, the blade body is retained by the fall prevention member, the blade body is tilted, and at least one of a current value or a rotation speed measured by a measurer changes from a predetermined value.