Fan Motor Base Portion Ventilation for Stator Cooling
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Solution Overview
Problem
Conventional axial blowers face challenges in cooling the stator, a heat generation source, which hampers the improvement of P-Q characteristics and can lead to shortened bearing life due to inadequate airflow along the outer circumferential surface of the boss portion.
Innovation Solution
The design incorporates a rotor supported by a bearing, a stator with a tubular inner surface, and a base portion featuring a protruding portion with ventilation openings that facilitate airflow to efficiently cool the stator and improve P-Q characteristics by allowing air to flow through ventilation portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a recess is provided on the outer circumferential surface of the boss portion to improve P-Q characteristics, then air flow is adjusted, but the stator cannot be sufficiently cooled
Solution Approach 1:
The invention transitions from two-dimensional surface cooling (air flow along the outer circumferential surface) to three-dimensional internal cooling (air flow through the boss portion via the recess and through-hole). This dimensional change allows cooling air to reach the stator from multiple directions, effectively solving the cooling insufficiency while maintaining P-Q characteristics improvement.
Solution Approach 2:
The cooling function is segmented into multiple pathways: the recess on the outer circumferential surface for P-Q improvement, and the through-hole for dedicated cooling. This segmentation allows each feature to perform its specific function optimally without interfering with the other, resolving the contradiction between performance enhancement and thermal management.
2Temperature
If air flow is increased to cool the stator, then cooling efficiency improves, but P-Q characteristics deteriorate
Solution Approach 1:
The air flow system is segmented into two independent channels: one through the recess for optimizing P-Q characteristics, and another through the through-hole for cooling the stator. This segmentation enables simultaneous optimization of both performance parameters without trade-offs, as each channel can be independently designed and controlled.
Solution Approach 2:
The through-hole acts as an intermediary cooling passage that introduces fresh air directly to the stator region without disrupting the main air flow path through the recess. This intermediary structure enables independent control of cooling air flow, allowing P-Q characteristics to be optimized separately from thermal management.
3Ease of manufacture
If the boss portion structure is simplified, then manufacturing ease improves, but cooling capability is reduced
Solution Approach 1:
The boss portion is designed with multi-functionality: it maintains the recess for P-Q characteristics improvement while incorporating the through-hole for cooling. This universal design approach allows a single structural element to perform multiple functions (performance optimization and thermal management) without requiring separate complex components, thus maintaining manufacturing simplicity while enhancing cooling capability.
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
This configuration enhances cooling efficiency, suppresses temperature rise, and extends the life of the fan motor by improving airflow and thermal management, thereby increasing input and maintaining P-Q characteristics.
Implementation Method 1
a first ventilation portion 151 which includes a lower opening 150 that is open downward at a center of the lower lid portion 141 and extends in an axial direction and a second ventilation portion 152 which communicates with the first ventilation portion 151 in a radial direction
Data Source
AI summary
A motor includes a rotor rotatable about a center axis that extends vertically, a stator opposing the rotor in a radial direction, and a base portion opposing a lower surface of the stator in an axial direction. The base portion includes a lower lid portion extending in a direction orthogonal or substantially orthogonal to the center axis, a protruding portion protruding in the axial direction from an upper surface at a center of the lower lid portion, and a stator holding portion adjacent to the protruding portion in the axial direction and contactable with an inner circumferential surface of the stator. The protruding portion includes a first ventilation portion opening downward at the center of the lower lid portion and a second ventilation portion to cause the protruding portion to communicate with the first ventilation portion.