Cooling Fan Rotor Stabilization via Magnetic Ring
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Solution Overview
Problem
Conventional cooling fans experience noise issues due to the 'floating' condition of the rotor during rotation, caused by external pressure from the fan blades, which leads to instability and increased noise levels.
Innovation Solution
A cooling fan design incorporating a magnetic ring made of hard magnetic material fixedly connected to the rotor and a bearing made of iron-copper alloy, where the magnetic ring exerts a magnetic attraction on the bearing to pull the rotor downward, preventing axial movement and thus reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the rotor is allowed to float during rotation to reduce friction, then the rotor can rotate more freely, but the rotor becomes unstable and generates noise
Solution Approach 1:
The patent applies magnetic attraction force as a counteracting force to balance the aerodynamic lift force that causes the rotor to float. The stator generates a magnetic field that attracts the rotor, creating a downward magnetic force that counterbalances the upward aerodynamic force, thereby stabilizing the rotor's axial position while allowing it to rotate freely.
2Stability of the object's composition
If magnetic attraction is applied to stabilize the rotor, then the rotor position becomes stable, but additional magnetic components are required
Solution Approach 1:
The stator serves dual functions: it generates the magnetic field necessary for motor operation and simultaneously provides the magnetic attraction force to stabilize the rotor's axial position. This multi-functionality eliminates the need for separate magnetic stabilization components, reducing structural complexity while achieving rotor position stability.
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 magnetic attraction stabilizes the rotor's position, reducing noise and ensuring consistent lubrication within the bearing, thereby enhancing the fan's performance and lifespan.
Implementation Method 1
The magnetic ring is made of hard magnetic material and exerts a magnetic attraction on the bearing, whereby the rotor is pulled downwardly by a magnetic attraction of the bearing on the magnetic ring
Data Source
AI summary
A cooling fan includes a fan housing (10) having a central tube (11) extending upwardly therefrom, a bearing (20) received in the central tube, a stator (40) mounted around the central tube, a rotor (30) having a shaft (37) extending into the bearing, and a magnetic ring (38) being fixedly mounted to the rotor to rotate with the rotor during operation of the cooling fan. The bearing is made of iron-copper alloy. The magnetic ring is made of hard magnetic material and exerts a magnetic attraction on the bearing, whereby the rotor is pulled downwardly by a magnetic attraction of the bearing on the magnetic ring to lessen the floating problem of the rotor during operation of the cooling fan.