Propeller Motor Rotor Cooling Structure for Moisture-Safe Airflow
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Solution Overview
Problem
Existing propeller driving devices for aircraft, particularly those using BLDC motors, face challenges with heat dissipation and moisture ingress, leading to reduced efficiency and potential electrical shorts or fires, especially in stopped conditions.
Innovation Solution
A propeller driving device utilizing an inner rotor-outer stator structure with insulating heat dissipation composite materials, incorporating a water jacket with a refrigerant circulation circuit, and a design featuring through holes and bridges for air cooling, along with insulating heat dissipation composite materials to surround the stator coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling holes are provided in the case to enable air cooling of the electric motor, then heat dissipation is improved, but foreign substances such as rainwater, moisture, or dust may enter the case causing electrical short circuits or fires
Solution Approach 1:
A cover member is introduced as an intermediary component between the external environment and the cooling holes. This cover member selectively blocks foreign substances while permitting air flow for cooling, thus mediating between the conflicting requirements of heat dissipation and protection against contamination
Solution Approach 2:
The cover member provides different functional properties at different locations: it has through holes that allow air passage for cooling while simultaneously having a repelling surface that prevents moisture and foreign substance penetration, achieving local differentiation of protective and cooling functions
2Productivity
If the case rotates at constant speed during operation, then propulsion is maintained, but foreign substances cannot enter the case during operation while the aircraft is parked outside, foreign substances may enter through the cooling hole
Solution Approach 1:
The cover member is designed to rotate together with the case during operation, dynamically adapting its orientation and position. This rotational movement ensures that the repelling surface continuously faces outward to prevent foreign substance entry while maintaining the cooling function, and during parking, the cover member's structure inherently blocks foreign substances from entering through the through holes
3Power
If the stator generates heat during motor operation, then motor driving capability is achieved, but heat accumulation lowers motor efficiency and lifespan
Solution Approach 1:
Air cooling is implemented by utilizing the rotational motion of the propeller and case to create air flow through the cooling holes and cover member. This pneumatic cooling system continuously removes heat from the stator without requiring additional mechanical cooling components, maintaining motor driving capability while preventing heat accumulation
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
Effectively cools the rotor and stator through outer and inner air cooling, prevents moisture ingress, and enhances insulation, thereby improving motor efficiency and preventing electrical shorts or fires.
Implementation Method 1
effective heat dissipation in a water-cooling manner by using a water jacket having a refrigerant circulation circuit
Implementation Method 2
refrigerant circulation circuit capable of circulating a refrigerant between an outer circumferential portion of a stator core and a casing
Implementation Method 3
inner air cooling by using an air flow passage formed inside a motor
Data Source
AI summary
Provided are a rotor, and a propeller driving device and an aircraft using same. The propeller driving device includes: a housing in which an upper cover and a lower cover having a plurality of through holes are respectively coupled to an upper portion and a lower portion of a cylindrical case; a stator arranged inside the case; a rotor arranged at a distance from the stator; and a rotary shaft connected to the rotor through a plurality of bridges and having both ends rotatably supported by an upper bearing and a lower bearing positioned at respective centers of the upper cover and the lower cover, wherein inner cooling of a motor is formed by an air flow passage that passes through a plurality of through holes of the upper cover and the lower cover and a plurality of spaces formed between the plurality of bridges.