Ceiling Fan Blade Balancing with Removable Tips
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Solution Overview
Problem
Ceiling fans often exhibit wobble due to blade imbalance, which is difficult to address during installation and perceived as a quality and safety issue, especially in larger designs with higher rotational speeds.
Innovation Solution
A ceiling fan assembly with a blade balancing assembly that includes removable blade tips and balancing weights, allowing for pre-balancing during factory assembly and easy matching of balanced blades to their corresponding mounts, eliminating the need for external balance weights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ceiling fan blades are used without removable tips, then the blade structure is simple, but the fan exhibits wobble due to blade imbalance during operation
Solution Approach 1:
The blade is divided into two separate parts: a blade body and a removable blade tip. This segmentation allows the blade tip to be independently adjusted or replaced to achieve proper balance, while the main blade structure remains simple. The blade tip can be removed and repositioned to counterbalance the blade, eliminating wobble without complicating the overall blade design.
Solution Approach 2:
The position of the blade tip along the blade span is adjusted to change the center of gravity of the blade. By moving the blade tip to different locations, the balance of the blade can be optimized to eliminate wobble. This parameter adjustment (position of mass) allows dynamic balancing without adding complex mechanisms.
2Reliability
If blade balancing is performed during installation, then the fan can operate smoothly, but the installation process becomes time-consuming and difficult
Solution Approach 1:
The blade tips are pre-balanced at the factory during manufacturing, before the fan reaches the consumer. This preliminary balancing action ensures that the blades are already optimized for smooth operation, eliminating the need for time-consuming balancing adjustments during installation. The installer simply needs to attach the pre-balanced blade tips to the corresponding blades.
Solution Approach 2:
The blade tip design allows it to self-balance the blade through its position and mass distribution. The blade tip acts as a built-in balancing weight that automatically compensates for imbalances when properly positioned, eliminating the need for external balancing weights or complex balancing procedures by the installer.
3Length of moving object
If larger blade span is used, then the fan covers more area, but the chance of imbalance increases due to natural variance in materials
Solution Approach 1:
The blade is segmented into blade body and removable blade tip, allowing independent adjustment of the tip position to compensate for imbalances introduced by larger blade spans. This segmentation enables fine-tuning of the center of gravity to counteract the increased leverage effects of longer blades.
Solution Approach 2:
The position parameter of the blade tip is adjusted to compensate for material variance in larger blades. By changing the location of the blade tip along the extended blade span, the center of gravity can be optimized to maintain balance despite the increased length and associated material variability.
4Speed
If higher rotational speeds are used, then the fan moves more air, but the amount of wobble increases due to blade imbalances
Solution Approach 1:
The position of the blade tip is optimized to achieve proper balance at higher rotational speeds. By adjusting the blade tip location, the center of gravity is positioned to minimize wobble and vibration that would otherwise be amplified at high speeds, allowing the fan to operate smoothly even at maximum rotational velocity.
Data Source
AI summary
A ceiling fan assembly having a motor with a rotor with multiple blade mounts, multiple blades having a removable blade tip, a balancing weight mount carried by the multiple blades and covered by the removable tip, and where each of the multiple blades are pre-balanced and indexed to a corresponding one of the multiple blade mounts.