Blower Wheel Hub Design for External Rotor Motor Attachment
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Solution Overview
Problem
Existing blower wheel designs require a significant amount of material for the motor housing, and attachment to the motor is necessary for rotation, which is inefficient.
Innovation Solution
A blower wheel with a central part having a cylindrical wall that includes a frontal wall with an opening greater than a predefined openness, allowing reduced material usage while enabling attachment to the external rotor motor for rotation and axial blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a frontal wall is provided in the central hub to house the motor, then the motor can be attached to the blower wheel, but the amount of material required increases significantly
Solution Approach 1:
The invention extracts the frontal wall from the central hub, removing the solid structure that housed the motor. Instead, the motor is attached directly to the cylindrical wall of the hub, eliminating the need for a separate frontal wall component and reducing material usage while maintaining attachment functionality
Solution Approach 2:
The invention segments the hub structure by separating the cylindrical wall from the frontal wall. The cylindrical wall retains attachment means for the motor, while the frontal wall is either removed or reduced to minimal structural elements, allowing independent optimization of each component
2Quantity of substance
If the frontal wall is completely removed to reduce material, then material usage is minimized, but attachment to the motor becomes difficult
Solution Approach 1:
The invention transitions the attachment interface from a two-dimensional frontal wall surface to a three-dimensional cylindrical wall surface. Attachment means are distributed around the circumference of the cylindrical wall, providing multiple attachment points that compensate for the absence of the frontal wall and ensure reliable motor coupling
Data Source
AI summary
A ventilation system includes a blower wheel (1) and a drive motor (9) with an external rotor (9b). The blower wheel (1) includes a central part (3) having a cylindrical wall (11) and defines a housing (13) to house the external rotor (9b). The blower wheel (1) further includes a frontal wall (15) comprising an opening (17) so as to exhibit a degree of openness that is greater than a predefined degree of openness.