Annular Motor Air Path Structure for Dust and Water Blocking
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Solution Overview
Problem
Existing motors used in rotary blade devices, such as those in unmanned aerial vehicles, are vulnerable to dust and water ingress through their air paths, compromising their dustproof and waterproof performance.
Innovation Solution
The motor design incorporates an annular rotor and stator configuration with projecting parts that create gaps in radial and axial directions, forming bent airflow paths to prevent dust and water from entering critical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an air path is provided for cooling the stator, then heat dissipation performance is improved, but dustproof and waterproof performance deteriorates
Solution Approach 1:
The air path is segmented into multiple sections by the first and second projecting parts, creating a multi-stage flow path that separates the cooling function from the dust/water prevention function. The first projecting part divides the air path radially, while the second projecting part further segments it axially, requiring contaminants to navigate complex paths rather than direct access to the stator.
Solution Approach 2:
The air path is designed with curved and bent geometry rather than straight lines. The first projecting part creates a radial gap that bends the airflow path, and the second projecting part creates additional curvature in the axial direction. This curved path design makes it difficult for dust and water to follow the airflow directly to the stator while still allowing effective cooling.
2Temperature
If the air path is opened to the outside for cooling, then cooling efficiency is improved, but reliability against water and dust ingress deteriorates
Solution Approach 1:
The protection mechanism operates in multiple dimensions: the first projecting part provides radial dimension protection by creating a radial gap, while the second projecting part provides axial dimension protection by creating an axial gap. This multi-dimensional approach blocks contaminants from reaching the stator from both radial and axial directions while maintaining cooling efficiency through the multi-stage air path.
Solution Approach 2:
The first and second projecting parts act as intermediary structures between the external environment and the stator. These projecting parts create intermediate gaps that allow airflow to pass through for cooling purposes while serving as physical barriers that prevent direct access of dust and water to the stator, effectively mediating between cooling requirements and protection requirements.
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 design enhances the motor's dustproof and waterproof performance by effectively blocking contaminants while maintaining efficient heat dissipation through airflow.
Implementation Method 1
When the motor is driven, the stator is cooled by flow of air in the air path
Data Source
AI summary
A motor and a rotary blade device capable of increasing dustproof and waterproof performance is provided. A motor includes an annular rotor and a stator opposing the rotor. The rotor includes a magnet and a housing covering the magnet. The stator includes a coil and a holder holding the coil. The housing includes a first projecting part projecting toward the holder. The holder includes a second projecting part projecting toward the housing. The second projecting part opposes the first projecting part via a gap in a radial direction.