Motor Case Axial Cooling Channels for Compact Stator Heat Removal
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Solution Overview
Problem
Existing motor designs face challenges in efficiently cooling critical components while minimizing the increase in motor volume due to limited discharge points for cooling media, often using annular rings that restrict discharge locations.
Innovation Solution
A motor design featuring a cooling medium channel with vertical and branching channels, allowing flexible discharge patterns directly toward the stator, including holes of varying diameters to optimize cooling based on component needs, and incorporating discharge points for lubrication and efficient use of space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If annular rings are placed in the motor case to cool the inside, then cooling function is provided, but the volume of the motor unit increases and the number and positions of discharge portions are limited
Solution Approach 1:
The patent transitions from radial cooling (annular rings) to axial cooling (discharge portions in the axial direction). The cooling medium channel extends in the axial direction with discharge portions that release cooling medium toward the stator in the axial direction, fundamentally changing the cooling dimension and enabling multiple discharge positions without increasing motor volume.
Solution Approach 2:
The cooling medium channel is divided into multiple segments with discrete discharge portions at different axial positions. This segmentation allows the cooling medium to be discharged at multiple locations along the axial direction, providing flexible and targeted cooling to different portions of the stator without requiring a single large cooling structure.
2Temperature
If annular rings are used for cooling, then cooling is provided, but the number and positions of discharge portions are limited
Solution Approach 1:
The patent moves from radial discharge (annular rings) to axial discharge (multiple positions along the axial direction). This dimensional change enables multiple discharge portions to be arranged at different axial locations, significantly increasing the flexibility and adaptability of cooling medium discharge positions and allowing targeted cooling of specific stator regions.
Solution Approach 2:
The cooling system design allows the number, positions, and dimensions of discharge portions to be flexibly adjusted based on cooling requirements. The channel configuration can be optimized to direct cooling medium to specific areas, making the cooling system adaptable to different thermal conditions and component layouts.
3Temperature
If multiple discharge portions are added to improve cooling, then cooling efficiency increases, but the space required for cooling increases
Solution Approach 1:
The cooling medium channel is integrated into the motor case structure itself, merging the cooling function with the housing. The channel utilizes the wall thickness and internal space of the motor case, eliminating the need for separate cooling components and preventing additional volume increase when adding multiple discharge portions.
Solution Approach 2:
The cooling medium channel is nested within the motor case wall structure. The channel occupies the wall thickness space and internal cavities of the motor case, effectively utilizing existing space rather than adding external cooling components, thus enabling multiple discharge portions without increasing overall motor volume.
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
Enhances cooling efficiency by directing cooling medium to specific motor components, reducing space requirements, and maintaining lubrication, thus improving overall motor performance.
Implementation Method 1
a cooling medium channel 40 and a plurality of discharge portions 50 in a cover 22 disposed on a non-output side of the motor 2 in the axial direction. The cooling medium channel 40 includes a first channel 42 extending in a vertical up-down direction. The discharge portions 50 are holes that allow the cooling medium to be discharged from the cooling medium channel 40 toward the stator 8 and the rotor 6
Data Source
AI summary
A motor includes: a shaft; a rotor fixed to the shaft; a stator having an annular shape about a central axis of the rotor; and a motor case that houses the rotor and the stator. The motor case includes a cooling medium channel and discharge portions in a surface of the motor case that faces the stator in an axial direction of the central axis. The cooling medium channel includes at least a first channel through which a cooling medium flows in a vertical up-down direction. The cooling medium is discharged in the axial direction from the cooling medium channel through the discharge portions toward the inside of the motor case.