Brushless Ceiling Fan Hub Assembly for Blade Retention and Quiet Control
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Solution Overview
Problem
Existing ceiling fan systems lack effective safety features and efficient motor designs to prevent fan blades from falling and ensure quiet operation, especially in larger sizes.
Innovation Solution
A ceiling fan system with a brushless motor, aerodynamic fan blades, and a hub assembly featuring retainer members and safety cables to secure blades in place, along with a control module for adjustable speed and safety features like automatic shutdown in case of overheating or imbalance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional motor designs are used in ceiling fans, then manufacturing cost is reduced, but operational noise increases and reliability decreases
Solution Approach 1:
The patent replaces traditional brushed DC motor mechanics with a brushless DC motor system. The brushless motor eliminates mechanical brushes and commutators, substituting them with electronic commutation through Hall effect sensors and controller circuitry. This substitution resolves the technical contradiction by eliminating mechanical wear and noise-generating components while improving reliability and reducing operational noise.
Solution Approach 2:
The patent changes the motor design parameters from traditional brushed DC to brushless DC configuration. This includes changing the winding arrangement, adding permanent magnets to the rotor, and implementing electronic control systems. These parameter changes eliminate the harmful effects of brush contact while maintaining the desired motor function, thereby improving reliability and reducing noise.
2Reliability
If safety features like retainer members and cables are added to secure fan blades, then safety is improved, but device complexity increases
Solution Approach 1:
The patent implements retainer members and safety cables as preliminary safety measures that are pre-installed on the hub assembly. These components are positioned in advance to secure fan blades before any potential failure occurs. The retainer members are pre-attached to the hub, and safety cables are routed through designated pathways, ensuring that if a blade fails, it is already constrained by these pre-positioned safety features.
Solution Approach 2:
The safety cables and retainer members serve as beforehand cushioning measures against blade failure. The cables are tensioned and positioned to catch and contain blades if they detach, preventing them from falling. This prior cushioning approach provides safety without requiring complex active monitoring or control systems during operation.
3Productivity
If aerodynamic fan blades with winglets are used, then airflow efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the fan blade into distinct functional sections: the main blade body and the separate winglet components at the tips. The winglets are designed as attachable segments that can be manufactured separately and then assembled to the main blade. This segmentation allows each component to be optimized for its specific function while simplifying the manufacturing process, as the complex aerodynamic features can be produced using standard molding or fabrication techniques for each segment.
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 system provides enhanced safety by preventing fan blades from falling and operates quietly with adjustable speed control, ensuring efficient and reliable performance even in larger sizes.
Implementation Method 1
a brushless motor (20) having an internal rotor (22) and an external stator (24)
Implementation Method 2
aerodynamic fan blades (50)
Data Source
AI summary
A fan system includes a motor, a rotatable hub, and a plurality of fan blades. The motor is coupled with the hub by a hollow drive shaft, such that the drive system of the fan system is gearless. The motor is controlled by a PFC-based control module, which is in communication with sensors that are configured to sense parameters associated with operation of the fan system. The control module is configured to react in certain ways to certain conditions detected by the sensors, such that the fan system uses feedback-based control algorithms. A remote control panel is in communication with the control module. The remote control panel is operable to display fault conditions detected by the sensors. Blade retainers prevent fan blades from falling when a fan blade breaks free from the hub. Pins prevent the hub from falling when the hub breaks free from the rotor.