Fan Motor Rotor Posture Adjustment via Localized Shaft Design
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Solution Overview
Problem
Conventional fan motors face challenges in adjusting the posture of the rotating member after assembly due to insufficient strength and rigidity of the shaft portion, leading to potential deformation and difficulty in achieving rotational balance.
Innovation Solution
The rotor is supported by a bearing to be rotatable about a central axis, featuring a rotor lid portion and a first protruding portion with a hole in one axial direction, and a second protruding portion with increased thickness, enhancing the structural integrity and allowing for post-assembly adjustment of the rotor's posture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cylindrical shaft portion is used in the rotor, then the structure is simple and easy to manufacture, but the strength and rigidity are insufficient causing deformation during post-assembly adjustment
Solution Approach 1:
The shaft portion is designed with non-uniform thickness, being thicker at the bearing support region and thinner at other sections. This local variation in geometry provides enhanced strength and rigidity where needed (at the bearing support) while maintaining simplicity and ease of manufacture in other areas, resolving the contradiction between manufacturing ease and structural strength.
2Ease of manufacture
If a cylindrical shaft portion is used, then the manufacturing process is simple, but the rigidity is insufficient preventing effective post-assembly posture adjustment
Solution Approach 1:
The shaft portion features localized thickness increase at the bearing support region, providing enhanced rigidity and stability where post-assembly adjustment is needed, while maintaining a simpler cylindrical geometry in other regions for ease of manufacture. This local quality enhancement resolves the contradiction between manufacturing simplicity and structural rigidity.
3Strength
If the shaft portion is made thicker throughout to improve strength, then rigidity increases, but the overall size and weight increase
Solution Approach 1:
Instead of uniformly increasing the shaft thickness throughout, the design applies thickness increase only locally at the bearing support region. This provides the necessary strength and rigidity where needed while minimizing weight increase in the overall rotor structure, resolving the contradiction between strength improvement and weight control.
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 design enables safe and precise adjustment of the rotor's posture after assembly, preventing deformation and improving the rotational balance and stability of the fan motor.
Implementation Method 1
a rotor (1) supported by a bearing (32) to be rotatable about a central axis (CA) extending in an axial direction
Implementation Method 2
The rotating member rotates relative to the bearing when the magnet rotates by excitation force between the rotating member and the coil
Data Source
AI summary
In a motor, a rotor is supported by a bearing to be rotatable about a central axis extending in an axial direction. The rotor includes a rotor lid portion and a first protruding portion. The rotor lid portion extends in a radial direction. The first protruding portion protrudes in one axial direction from the rotor lid portion, extends along the central axis, and is rotatably supported by a bearing. The bearing has a cylindrical shape extending in the axial direction and surrounds the first protruding portion. A hole extending in another axial direction is located in an end portion in the one axial direction of the first protruding portion. An axial length of the hole is less than about half of an axial length of the first protruding portion.