Impeller Motor PCB Layout for Lower Flow Resistance
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Solution Overview
Problem
Conventional motors experience increased flow resistance due to the presence of a printed circuit board (PCB) within the flow path, which restricts fluid flow and reduces efficiency, especially in compact devices like hair dryers where the PCB protrudes into the fluid flow path.
Innovation Solution
The motor design incorporates a PCB with radially protruding elements and concave portions that are angled and recessed towards the center, allowing the PCB to be spaced apart from the bracket and reducing the likelihood of fluid collision, thereby minimizing flow resistance. Additionally, the bracket is designed to overlap the PCB's protrusions in the axial direction, further optimizing fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the PCB is disposed adjacent to the power portion to reduce device size, then the device compactness is improved, but the flow resistance increases due to PCB protruding into the flow path
Solution Approach 1:
The PCB is positioned in the axial direction rather than radially protruding into the flow path. The bracket extends axially from the impeller hub, placing the PCB in a dimension (axial spacing) that does not obstruct the radial fluid flow, thus resolving the contradiction between compactness and flow resistance
Solution Approach 2:
The bracket serves as an intermediary structure that connects the impeller hub to the PCB while maintaining axial spacing. This intermediary element allows the PCB to be positioned close to the power portion for compactness while preventing direct obstruction of the fluid flow path
2Device complexity
If the PCB protrudes into the flow path to save space, then the device complexity is reduced, but the fluid flow efficiency deteriorates due to collision with the PCB
Solution Approach 1:
The design transitions from radial PCB positioning (which obstructs flow) to axial positioning via the bracket extension. This dimensional change maintains structural simplicity while eliminating fluid-PCB collision, thereby preserving both low complexity and high flow efficiency
3Loss of energy
If the PCB is positioned close to the power portion for compact design, then the energy loss is reduced, but the flow resistance increases due to the PCB blocking the flow path
Solution Approach 1:
By positioning the PCB axially along the bracket extension rather than radially in the flow path, the design minimizes energy loss through compact proximity to the power portion while avoiding flow resistance by occupying a non-obstructive spatial dimension
Data Source
AI summary
A motor includes: an inner housing defining an accommodation space, an outer housing defining a flow path with the inner housing, an impeller disposed at a first side of the inner housing, a power portion that is disposed in the accommodation space and that includes a rotation shaft coupled to the impeller so as to be rotated together with the impeller, a bracket coupled to the inner housing at a second side of the inner housing and rotatably supporting the rotation shaft, and a printed circuit board (PCB) that is spaced apart from the bracket by a predetermined distance and that is electrically connected to the power portion. A circumference of the PCB includes a plurality of concave portions that are spaced apart from each other, and the plurality of concave portions are recessed toward a center of the PCB.