Outer Rotor Motor with Immersed Stator Cooling
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Solution Overview
Problem
Conventional motor designs with inner rotor types face challenges in cooling efficiency due to trapped heat within the motor housing, requiring additional components like condensers and flow paths that increase the motor's size and complexity.
Innovation Solution
The motor design features a shaft-centered outer rotor type with a stator and housing filled with a cooling medium, where the stator and coil are immersed, allowing for efficient cooling through convection, vaporization, and circulation of the cooling medium, reducing the need for large condensers and minimizing heat trapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an inner rotor type motor configuration is used with traditional cooling methods, then cooling can be achieved, but the motor size increases due to required condensers and flow paths
Solution Approach 1:
The patent combines the cooling medium storage function with the housing structure by filling the housing interior space with cooling medium. This eliminates the need for separate condensers and complex flow paths, achieving effective cooling while maintaining a compact motor size.
Solution Approach 2:
The cooling medium in the housing performs self-circulation through natural convection caused by temperature differences. The cooling medium absorbs heat from the stator and rotor, rises due to thermal expansion, and circulates automatically without requiring external pumps or complex circulation systems.
2Temperature
If an inner rotor type motor is used with traditional cooling structure, then cooling function can be provided, but device complexity increases due to additional components
Solution Approach 1:
The patent extracts the cooling function from the mechanical structure by utilizing the housing interior space as the cooling medium storage area. This eliminates the need for separate cooling components such as condensers, pumps, and complex flow paths, significantly simplifying the overall device structure.
Solution Approach 2:
The housing serves multiple functions: it provides structural support, contains the stator and rotor, and simultaneously acts as a cooling medium reservoir. This multi-functionality reduces the number of components needed and simplifies the cooling structure.
3Temperature
If cooling medium is circulated through separate flow paths, then cooling effectiveness can be maintained, but the motor structure becomes more complex and larger
Solution Approach 1:
The cooling medium circulates through the motor components via natural convection driven by temperature-induced density differences. Hot cooling medium rises and cool medium sinks, creating automatic circulation that effectively cools the stator and rotor without requiring pumps or complex controlled flow paths.
Solution Approach 2:
The patent merges the cooling medium storage function with the housing structure by filling the housing interior space with cooling medium. This eliminates the need for separate condensers and complex flow paths, achieving effective cooling while maintaining a compact motor size.
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 cooling efficiency by utilizing liquid immersion boiling, improving torque performance and reducing the motor's size while maintaining high cooling performance without increasing the cooling structure's complexity.
Implementation Method 1
a cooling medium with which the housing member is filled, where the stator and the coil is immersed in the cooling medium
Implementation Method 2
The motor further includes a shaft centered on a center axis extending in a predetermined direction, and a stator located radially outside of the shaft... a cooling medium with which the housing member is filled, where the stator and the coil is immersed in the cooling medium
Implementation Method 3
This design enhances cooling efficiency by utilizing liquid immersion boiling
Data Source
AI summary
In an aspect of the motor of the present invention, the motor includes a shaft centered on a center axis extending in a predetermined direction, and a stator located radially outside of the shaft. The stator has a coil wound around the stator. The motor further includes a housing member having a substantially cylindrical shape with a bottom, where the housing member accommodates substantially the entire stator, and supports the shaft, a cooling medium with which the housing member is filled, where the stator and the coil is immersed in the cooling medium, and a rotor that rotates radially outside of the housing member with the center axis of the shaft as a rotation center.