Liquid-Cooled Rotor Axial Flow Heat Dissipation
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Solution Overview
Problem
Existing electric machines face limitations in heat dissipation due to inefficient cooling methods, where the cooling fluid is directed away from the rotor soon after entry, leading to inadequate and disproportionate heat removal, which can damage components.
Innovation Solution
The electric machine design includes a housing with end caps and bearings that allow for axial communication between fluid passageways, enabling the cooling fluid to flow through the rotor's length and radially outward to the stator windings at both ends, ensuring uniform heat transfer and dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling fluid is directed axially into the rotor shaft and immediately outward via radially-bored passageways, then some heat removal from the generator is achieved, but the heat removal is insufficient and disproportionate, particularly from the rotor and one end
Solution Approach 1:
The rotor shaft is segmented into multiple cooling zones with separate passageway systems. The cooling fluid flow path is divided into: (1) axial flow through the rotor shaft length, (2) radial flow through radially-bored passageways, and (3) additional axial flow through axial passageways at both ends. This segmentation allows proportional heat removal from different rotor regions, preventing localized overheating and component damage.
Solution Approach 2:
The cooling system transitions from a single-dimension radial cooling approach to a multi-dimensional cooling system. Fluid flow occurs in multiple dimensions: axial flow through the rotor shaft length, radial flow outward to stator windings, and bidirectional axial flow at both rotor ends. This multi-dimensional approach ensures comprehensive and uniform heat removal throughout the entire rotor structure.
2Device complexity
If cooling fluid enters the rotor shaft from only one end and is immediately redirected away, then the cooling system is simple, but little or no heat is removed from the other end of the rotor
Solution Approach 1:
The cooling system is segmented into multiple independent flow paths: (1) axial passageways at the first end for cooling that region, (2) axial passageways at the second end for cooling that region, and (3) radial passageways for cooling the rotor shaft body. This segmentation enables uniform heat removal across all rotor regions without requiring overly complex fluid distribution mechanisms.
Solution Approach 2:
The cooling system achieves multi-functionality by using the same cooling fluid to perform multiple cooling tasks simultaneously: cooling the rotor shaft body through radial passageways, cooling the first rotor end through first axial passageways, and cooling the second rotor end through second axial passageways. This universal cooling approach ensures uniform temperature distribution without proportionally increasing system complexity.
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 design enhances cooling efficiency by allowing even heat removal along the rotor's length and from both ends, reducing heat-induced stresses and increasing the power output capacity of the electric machine.
Implementation Method 1
the cooling fluid to flow through the rotor's length and radially outward to the stator windings at both ends, ensuring uniform heat transfer and dissipation
Implementation Method 2
directing fluid from the housing axially from one end of the rotor through to the other end of the rotor, and directing fluid from the rotor radially outward to windings of the stator
Data Source
AI summary
An electric machine for a power system is disclosed. The electric machine has a housing with a first end cap and a second end cap. The first end cap has a first fluid passageway, and the second end cap has a second fluid passageway. The electric machine also has a stator fixedly disposed within the housing, and a rotor rotationally disposed radially inward from the stator. The rotor has an axial passageway fluidly communicating the first fluid passageway with the second fluid passageway.