Stator Core Cooling Channels for Uniform Motor Temperature

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Solution Overview

Problem

Existing motor cooling structures with a single cooling channel experience uneven cooling due to a significant temperature gradient, leading to reduced cooling performance as the coolant's temperature increases, resulting in degraded motor performance.

Innovation Solution

A device with multiple cooling channels in the stator core, featuring separate coolant inlets and outlets, allows coolant to flow in straight lines in different directions, minimizing temperature gradients and ensuring even cooling across the motor.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a single cooling channel is used with zigzag array to circulate coolant back and forth, then the coolant path covers the entire stator core, but the channel length becomes very long causing severe temperature gradient and uneven cooling

Engineering Contradiction:

Improvecoolant temperature uniformityVSAvoidcooling channel length

Core Design Contradiction:

TemperatureVSLength of moving object

Solution Approach 1:

The single cooling channel is divided into multiple cooling channels (first cooling channels and second cooling channels) arranged alternately along the circumferential direction. Each cooling channel has its own coolant inlet and outlet, segmenting the coolant flow path to reduce individual channel lengths and minimize temperature gradients, thereby achieving more uniform cooling across the stator core.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cooling channels are arranged in multiple dimensions: alternately along the circumferential direction and positioned at different radial locations. This multi-dimensional arrangement allows coolant to flow in straight lines in different directions simultaneously, reducing the need for long zigzag paths while ensuring comprehensive coverage of the stator core.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If a single cooling channel with zigzag path is used, then coolant circulation is achieved, but cooling performance degrades near the outlet due to temperature increase along the path

Engineering Contradiction:

Improvecooling performance uniformityVSAvoidcoolant cooling capacity

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

Multiple cooling channels with separate inlets and outlets are created, segmenting the coolant flow into multiple parallel paths. This ensures that coolant flows through shorter distances in each channel, maintaining lower temperatures throughout and preserving cooling capacity across all regions of the stator core, eliminating the performance degradation near the outlet.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different cooling channels are positioned at different locations (alternately along circumferential direction) to provide localized cooling where needed. Each channel optimizes cooling for its specific region, ensuring uniform cooling performance across the entire stator core without the temperature gradient issues of a single long channel.

Inventive Principle:

Principle #3Local quality

3Temperature

If multiple cooling channels with separate inlets and outlets are formed, then coolant flows in straight lines reducing temperature gradient, but device complexity increases

Engineering Contradiction:

Improvecoolant temperature distributionVSAvoidcooling channel configuration

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The stator core is segmented into multiple cooling channels with alternating arrangement along the circumferential direction. This segmentation creates straight-line flow paths that reduce temperature gradients while maintaining a regular, repeating pattern that limits overall structural complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Multiple cooling channels perform the same cooling function simultaneously in parallel, allowing the system to achieve uniform temperature distribution through redundancy. This multi-functional approach distributes the cooling load across multiple identical structures, making the complexity manageable through standardization.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 enhances motor cooling performance by reducing channel length and ensuring uniform cooling, thereby maintaining optimal motor operation.

Implementation Method 1

the coolant flows first through the coolant inlet 21, taking away heat from the stator core 10 for cooling

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

the coolant flows through the coolant inlet 21, taking away heat from the stator core 10 for cooling while circulating back and forth along the single cooling channel 22

Methodology Applied

Scientific EffectConvection: Convection

Data Source

PatentUS12418207B2Device for cooling a motor

Publication Date: 2025.09.16 HYUNDAI MOTOR CO LTD

AI summary

A device for cooling a motor can improve motor cooling performance with multiple cooling channels formed in a stator core of the motor, allowing a coolant to flow in both directions therethrough. The device is capable of maximizing motor cooling performance in such a manner that two or more multiple cooling channels are formed in a stator core with a separate coolant inlet and outlet. The coolant moves in a straight line in different directions along each cooling channel to cool the stator core, and thus the temperature gradient of the coolant is minimized to cool the entire area of the motor evenly.