End Cap Oil Spray Cooling for Electric Machine Coils
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Solution Overview
Problem
Conventional cooling methods for electrical machines, such as air or liquid coolant circulation through exterior housings, are inefficient and may require bulky external cooling jackets or submersion in liquid, leading to increased size, weight, and resistance.
Innovation Solution
An internal oil cooling system where a fluid is sprayed from an end cap onto the coils of the stator within the electrical machine, utilizing a fluid inlet and outlets to deliver and distribute the coolant effectively, thereby absorbing and carrying away heat generated during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air or liquid coolant is circulated through an exterior housing, then the electrical machine can be cooled, but the size and weight of the cooling system increases due to bulky external cooling jackets
Solution Approach 1:
The cooling system is nested within the electrical machine structure itself. The end cap houses internal fluid outlets that spray coolant directly onto the coils, eliminating the need for external cooling jackets. The coolant delivery system is integrated into the existing end cap structure, allowing the cooling function to be contained within the machine's own components rather than requiring separate external cooling apparatus.
2Temperature
If air or liquid coolant is circulated through an exterior housing, then the electrical machine can be cooled, but the device complexity increases due to external cooling jackets or submersion requirements
Solution Approach 1:
The cooling system merges with the electrical machine's existing structure. The end cap, which is already a necessary component of the electrical machine, is designed to incorporate fluid outlets and coolant distribution channels. This combines the structural support function of the end cap with the cooling function, eliminating the need for separate external cooling jackets or complex submersion systems.
3Temperature
If external cooling jackets are used, then cooling can be provided, but the length and volume of the electrical machine increases
Solution Approach 1:
The cooling components are nested within the existing end cap structure of the electrical machine. The fluid outlets are integrated into the end cap, and the coolant spray system is contained within the machine's existing dimensional envelope. This eliminates the need for extended external cooling jackets that would increase the overall length and volume of the electrical machine.
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
This method enhances cooling efficiency by reducing the need for external cooling jackets, minimizing size and weight, and improving operational resistance, while allowing for continuous fluid flow and recycling for sustained cooling performance.
Implementation Method 1
a fluid is sprayed from the end cap onto the plurality of coils to carry away heat generated by the electrical machine
Data Source
AI summary
A system for cooling an electrical machine is disclosed. The electrical machine includes a stator including a plurality of coils, an exterior housing, and an end cap. During operation of the electrical machine, a fluid is sprayed from the end cap onto the plurality of coils to carry away heat generated by the electrical machine.