Motor Frame Stator Mount Layout to Reduce Airflow Stagnation
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Solution Overview
Problem
Conventional electric motor assemblies experience performance degradation due to increased air flow loss and formation of stagnant zones around the stator fixing part, leading to reduced coupling force and increased vibration and noise.
Innovation Solution
The electric motor assembly incorporates a stator fixing part that is inclined with respect to the axial direction to correspond to the rotational component of air moved by the impeller, thereby reducing air flow loss and stagnant zone formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the stator fixing part extends along the axial direction to secure coupling force, then the coupling force between bearings, impeller, and PCB is improved, but an air flow stagnant zone is generated in the periphery of the stator fixing part, causing an increase in flow path loss
Solution Approach 1:
The stator fixing part is designed to extend in the radial direction rather than the axial direction, changing the dimension of extension. This radial extension allows the fixing part to provide sufficient coupling force while avoiding the creation of stagnant zones in the axial flow path, thus resolving the contradiction between coupling force and flow path loss.
2Loss of energy
If the width of the stator fixing part is decreased to reduce flow path loss, then the flow path loss caused by air flow stagnant zone is reduced, but the coupling force between bearings, impeller, and PCB is reduced, causing increased clearance and vibration
Solution Approach 1:
The stator fixing part extends in the radial direction with a controlled width that does not excessively protrude axially. This radial extension strategy provides sufficient coupling force through increased contact area while maintaining a compact axial profile that minimizes interference with the air flow path, thus resolving the contradiction between coupling force and flow path loss.
3Reliability
If the stator fixing part protrudes axially from the frame body, then the stator is securely coupled to the frame, but air that has passed through the body is spread or diffused in the radial direction, reducing axial flow component and degrading performance
Solution Approach 1:
The stator fixing part is designed to extend primarily in the radial direction rather than the axial direction. This radial extension provides secure coupling between the stator and frame through increased contact area and mechanical interlocking, while maintaining a minimal axial profile that does not interfere with the axial flow of air, thus resolving the contradiction between coupling reliability and air flow performance.
4Device complexity
If parts are disposed in the flow path of air moved by the impeller, then the motor assembly structure is completed with all necessary components, but air flow loss increases due to the presence of these parts
Solution Approach 1:
The stator fixing part is designed with specific local characteristics: it extends radially with a controlled width and is positioned at the periphery of the stator. This localized design allows the fixing part to perform its coupling function while minimizing its presence in the main air flow path, thus reducing air flow loss while maintaining structural completeness.
Data Source
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AI summary
An electric motor assembly includes: an impeller; a plurality of vanes disposed at one side of the impeller along an axial direction; a stator disposed at one side of the plurality of vanes along the axial direction; a rotor rotatably disposed with respect to the stator and configured to rotate the impeller; and a frame coupled to an outside of the stator along a radial direction. The frame includes a body that has a cylindrical shape, is disposed at the outside of the stator and is provided therein with an air flow path, a plurality of stator fixing parts protruding from an inner surface of the body so as to be coupled to the stator. The plurality of stator fixing parts is disposed to be inclined with respect to the axial direction. Accordingly, formation of a flow stagnant zone of air moved by the impeller may be suppressed.