Stator Core Cooling Structure for Central Heat Removal
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Solution Overview
Problem
Existing cooling methods for stator cores in electric motors, particularly in hybrid vehicles, are inefficient in cooling the central portion of the stator core, leading to potential damage from high temperatures.
Innovation Solution
A stator cooling structure that incorporates a thermally conductive material, such as copper or aluminum, inserted into the teeth of the stator core to transfer heat from the inner circumferential surface outwards, combined with an oil flow groove on the outer surface to enhance cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If oil cooling is applied between the outer circumferential surface of the stator body and the motor housing, then the outer portions of the stator core are cooled, but the central portion of the stator core is not effectively cooled
Solution Approach 1:
The cooling structure is segmented into multiple independent thermal conductive units, each inserted into individual teeth of the stator core. Each unit consists of a thermal conductive member (such as copper or aluminum) that independently conducts heat from the central portion of the stator core to the oil flow path, enabling distributed cooling across the central region without requiring a complex integrated cooling system.
Solution Approach 2:
The cooling approach transitions from uniform outer surface cooling to localized central portion cooling by inserting thermal conductive members specifically into the teeth of the stator core. This creates high thermal conductivity pathways precisely where heat generation is most intense in the central region, optimizing cooling efficiency for the problematic area while maintaining overall system simplicity.
2Loss of energy
If thermal conductive material is inserted into teeth of the stator core, then heat transfer from the inner circumferential surface is improved, but the structural complexity of the stator core increases
Solution Approach 1:
The thermal conductive members are merged with the existing tooth structure of the stator core, utilizing the empty spaces within the teeth for insertion. The thermal conductive members are positioned to extend from the inner circumferential surface through the teeth, merging the cooling function with the structural framework without requiring separate cooling components or major structural modifications.
Solution Approach 2:
The thermal conductive members utilize the natural convection current of the cooling oil that already flows through the system. The oil flow pattern automatically creates effective heat transfer from the thermal conductive members without requiring additional active cooling mechanisms, control systems, or complex fluid management infrastructure.
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 central portion of the stator core by quickly transferring heat to the oil flow, improving cooling performance without increasing the motor's volume or requiring design changes.
Implementation Method 1
a thermal conductive unit provided on the inner circumferential surface of the stator body and configured to transfer heat from the inner circumferential surface of the stator body outwards in an axial direction
Implementation Method 2
combined with an oil flow groove on the outer surface to enhance cooling efficiency
Data Source
AI summary
Disclosed is a cooling structure of an electric motor, and more particularly to a stator core having a cooling structure to cool a central portion of the stator core of a motor. An aspect of the disclosure is to provide a stator cooling structure of the motor to efficiently cool the central portion of the stator core of the motor.