Fan Control Method for Dust Removal via Variable Rotation Angles
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Solution Overview
Problem
Conventional fan control methods are inefficient in removing dusts or objects of varying sizes, leading to reduced heat dissipation efficiency over time, as they rely solely on reversing blade rotation which is ineffective for large or small debris.
Innovation Solution
A fan control method that determines the appropriate dust removing mode based on a control factor (voltage, current, or power value) to alternate forward and reverse rotations by specific angles, allowing for different modes to address dusts or objects of different sizes, including a third mode with stepped movements for smaller debris.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the fan rotates blades reversely to remove dust, then dust removal function is provided, but dusts or objects of different sizes cannot be effectively removed
Solution Approach 1:
The patent changes the rotation angle parameter of the fan blades to create different dust removing modes. By adjusting the rotation angle to different ranges (first range for large dust, second range for small dust), the system adapts to remove dusts of different sizes effectively, resolving the contradiction between versatility and efficiency.
2Duration of action of stationary object
If the fan operates continuously, then heat dissipation function is maintained, but dust accumulates on blades reducing efficiency
Solution Approach 1:
The patent implements periodic dust removing actions during fan operation. By periodically executing dust removing modes (forward and reverse rotation at specific angles) during continuous operation, the system maintains heat dissipation efficiency while operating for extended periods, resolving the contradiction between operational duration and efficiency.
3Device complexity
If simple reverse rotation is used for dust removal, then the control structure is simple, but dusts of various sizes are not effectively removed
Solution Approach 1:
The patent introduces dynamic control by determining rotation angles based on detected dust sizes. The control structure dynamically adjusts the rotation angle to different ranges depending on the detected dust size, enabling effective removal of dusts of various sizes while maintaining reasonable control complexity through automated detection and adjustment.
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 method effectively prevents the reduction of heat dissipation efficiency by using alternating rotation angles and stepped movements to remove dusts and objects of various sizes, ensuring optimal fan performance.
Implementation Method 1
The major conventional method for heat dissipation in various kinds of electronic devices is to configure a fan for enforcedly increasing the air convection
Data Source
AI summary
A fan control method includes the steps of: acquiring a control factor; determining whether the control factor is located in a first range or a second range; executing a first dust removing mode if the control factor is located in the first range; executing a second dust removing mode if the control factor is located in the second range; and executing a normal mode if the control factor is not located in the first range and the second range.