Rotor Shaft Cooling Tube Geometry for Bidirectional Heat Dissipation
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Solution Overview
Problem
Existing cooling mechanisms for rotating electric machines in flying objects are complex and inefficient, particularly when the rotor rotates in different directions, leading to varying cooling efficiencies.
Innovation Solution
A cooling device with a tubular member inserted into the rotor shaft, featuring a variable cross-sectional area in the internal hollow part to maintain consistent cooling efficiency regardless of rotor direction, utilizing a cooling medium feed unit that integrates with the rotor's rotation to circulate the coolant without additional pumps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling mechanism is designed for a rotating electric machine, then cooling effectiveness is improved, but device complexity increases
Solution Approach 1:
The cooling mechanism merges the cooling function with the existing rotor shaft structure by inserting a tubular member into the hollow rotor shaft. The rotor shaft serves dual purposes: mechanical rotation and cooling medium passage, eliminating the need for separate cooling components and reducing overall device complexity while maintaining effective cooling
Solution Approach 2:
The hollow rotor shaft is designed to serve multiple functions: it provides structural support for the rotor, enables rotational motion, and simultaneously acts as a passage for cooling medium flow. This multi-functionality reduces the need for additional dedicated cooling components, thereby simplifying the overall device structure
2Ease of manufacture
If a cooling mechanism uses a tubular member with constant cross-sectional area, then manufacturing is simplified, but cooling efficiency varies with rotor rotation direction
Solution Approach 1:
The tubular member features a non-uniform cross-sectional area that varies along its length, with the cross-sectional area increasing from the proximal end toward the distal end. This local variation in geometry optimizes the cooling medium flow characteristics and heat dissipation efficiency at different locations, ensuring consistent cooling performance regardless of rotor rotation direction while remaining manufacturable
Solution Approach 2:
The variable cross-sectional area design creates dynamic flow characteristics that adapt to the direction of rotor rotation. As the rotor rotates in different directions, the cooling medium flows through the tubular member with optimized velocity distribution, maintaining effective heat transfer coefficients and consistent cooling efficiency across all operating conditions
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
The solution ensures consistent cooling performance across different rotational directions of the rotor, reducing component complexity and maintaining efficient heat dissipation with a simple configuration.
Implementation Method 1
a cooling medium feed unit configured to cause a cooling medium to flow through a cooling medium flow path
Implementation Method 2
a cooling medium flows through the coolant supply pipe from the proximal end thereof located outside the cooling hole toward the distal end thereof located inside the cooling hole
Data Source
AI summary
A cooling device includes: a tubular member inserted into a hollow rotor shaft; and a cooling medium feed unit for causing a cooling medium to flow through a cooling medium flow path including a first partial flow path and a second partial flow path. The first partial flow path and the second partial flow path communicate with each other at a distal end of the tubular member, and the cross-sectional area of the second partial flow path at the distal end of the tubular member is larger than the cross-sectional area of the second partial flow path at a proximal end of the tubular member.