Motor Oil Guide Structure for Uniform End-Coil Cooling
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Solution Overview
Problem
Existing motor cooling systems face challenges with uneven distribution of cooling oil, leading to overheating in certain motor parts and potential hot spots due to inadequate reflection of flow characteristics at varying rotation speeds.
Innovation Solution
A motor cooling device featuring an oil guide with an asymmetric annular structure and strategically positioned outlet holes of different shapes, along with a partition wall to manage secondary oil flows, enhances cooling efficiency by optimizing oil distribution and reusing secondary flows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If direct cooling methods using cooling oil are used to meet high-efficiency and high-power requirements, then cooling performance is improved, but uneven distribution of cooling oil causes overheating in certain motor parts
Solution Approach 1:
The oil guide is divided into multiple segments with different outlet hole configurations. The guide body includes a first region with first outlet holes and a second region with second outlet holes, allowing different parts of the winding to receive cooling oil at different rates based on their specific cooling needs
Solution Approach 2:
Different regions of the oil guide are designed with different outlet hole characteristics. The first outlet holes have different shapes, sizes, or distributions compared to the second outlet holes, creating localized cooling zones that address specific heat generation patterns in different winding regions
2Device complexity
If cooling oil flow characteristics are not adjusted for varying rotation speeds, then system simplicity is maintained, but hot spots occur locally due to inadequate flow adaptation
Solution Approach 1:
The oil guide incorporates dynamic flow adaptation through its asymmetric structure and multiple outlet configurations. As rotation speed changes, centrifugal forces and flow patterns naturally adjust the distribution of cooling oil across different outlet holes, providing rotation-speed-adaptive cooling without additional control mechanisms
Solution Approach 2:
The oil guide features an asymmetric structure where the first and second regions have different outlet hole arrangements. This asymmetry allows the cooling system to naturally adapt to rotational dynamics, as the oil flow distribution changes with rotation speed to prevent hot spots in different winding regions
3Productivity
If secondary flow of cooling oil is not utilized, then system simplicity is maintained, but cooling efficiency is reduced due to unused cooling potential
Solution Approach 1:
The partition wall structure captures and redirects secondary flows of cooling oil that would otherwise be discarded. By preventing these flows from escaping or circulating uselessly, the system recovers their cooling potential and directs them to additional cooling zones, improving overall cooling efficiency
Solution Approach 2:
The partition wall acts as an intermediary element that manages the interaction between primary and secondary cooling oil flows. It redirects secondary flows back into the cooling circuit, ensuring they continue to perform their cooling function rather than being wasted
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 effectively addresses overheating issues by improving oil distribution and maximizing cooling efficiency, reducing the likelihood of local hot spots and enhancing motor performance.
Implementation Method 1
Methods of cooling motors include air cooling methods using forced convection of surrounding air
Implementation Method 2
a partition wall disposed above and spaced apart from the end coil
Data Source
AI summary
The present disclosure relates to a motor cooling device and a motor including an oil cooling system. An embodiment of the present disclosure provides a motor including a stator assembly including an end coil which includes a plurality of layers and is externally exposed, an oil guide disposed in front of or behind the stator assembly, and a partition wall disposed above and spaced apart from the end coil, wherein the oil guide includes a guide body, one inlet hole formed in one surface of the guide body, and a plurality of outlet holes formed in another surface of the guide body, wherein the plurality of outlet holes are formed in different shapes according to positions at which the plurality of outlet holes are disposed.