Stator Core Radial Flow Channels for High Power Density Cooling
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Solution Overview
Problem
Conventional heat dissipation methods for motor stators are inefficient, failing to meet the increased heat dissipation requirements due to higher power density in modern motors.
Innovation Solution
A stator silicon steel sheet with radial flow channels that form inner and outer cooling channels, allowing coolant to flow between them, enhancing heat dissipation efficiency by communicating through radial flow channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional heat dissipation methods are used for motor stators, then the motor structure remains simple, but the heat dissipation efficiency is insufficient and cannot meet the requirements of high power density motors
Solution Approach 1:
The cooling system is segmented into multiple independent cooling holes (first cooling holes and second cooling holes) distributed across different stator silicon steel sheets. Each cooling hole acts as an independent cooling channel that can be selectively activated, allowing the system to achieve efficient heat dissipation while maintaining structural simplicity through modular design
Solution Approach 2:
The cooling holes are nested within the stator silicon steel sheets themselves, with the cooling channels integrated directly into the stator core structure. The first and second cooling holes are positioned at different radial distances from the center, creating a nested arrangement that maximizes cooling efficiency while minimizing additional structural complexity
2Power
If the motor power density is increased, then the motor volume is reduced, but the heat dissipation requirements become more stringent and conventional methods fail to meet them
Solution Approach 1:
Different regions of the stator core are provided with different cooling configurations. First cooling holes are positioned at greater radial distances from the center while second cooling holes are positioned closer to the center, creating localized cooling zones that match the heat generation distribution in high power density motors, thereby improving overall heat dissipation performance
Solution Approach 2:
The cooling system transitions from conventional single-dimension cooling to multi-dimensional cooling by implementing cooling holes at different radial positions (first cooling holes at greater radius, second cooling holes at smaller radius) and different axial positions. This multi-dimensional arrangement enhances heat dissipation capability to support higher power density while maintaining compact 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
Improves cooling performance and heat dissipation efficiency, extending the service life and power performance of motors and powertrains.
Implementation Method 1
Each radial flow channel is configured to communicate with one first cooling hole and one second cooling hole, and the first cooling hole and the second cooling hole are adjacently arranged in the radial direction of the stator silicon steel sheet
Implementation Method 2
Coolant may be fed into the first cooling hole, and the coolant may also be fed into the second cooling hole, to form two cooling channels in a radial direction of the stator core
Implementation Method 3
The first cooling hole may communicate with the second cooling hole through the radial flow channel, so that the coolant can flow between the first cooling hole and the second cooling hole
Data Source
AI summary
A stator silicon steel sheet, a stator core, and an electric vehicle are provided. The stator silicon steel sheet includes a plurality of first cooling holes, a plurality of second cooling holes, and at least one radial flow channel. In an axial direction of the stator silicon steel sheet, each first cooling hole and each second cooling hole penetrate the stator silicon steel sheet. In a radial direction of the stator silicon steel sheet, a distance between each first cooling hole and a center of the stator silicon steel sheet is greater than a distance between each second cooling hole and the center of the stator silicon steel sheet. Each radial flow channel is configured to communicate with one first cooling hole and one second cooling hole. The radial flow channel can enhance heat dissipation performance of the motor.