Skewed Cooling Channels in Variable Reluctance Machine Rotor
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Solution Overview
Problem
Conventional cooling methods for electric machines, such as using airgaps or external cooling fans, are inefficient for heat absorption and require additional components, leading to weight increases and reduced efficiency, especially in high-speed applications.
Innovation Solution
A variable reluctance electric machine design featuring salient poles with circumferentially skewed cooling fluid channels that facilitate both axial and radial flow, eliminating the need for external cooling fans by directing cooling fluid effectively through the machine to enhance heat transfer and dissipation from electromagnetic windings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional cooling methods using airgaps or external cooling fans are employed, then cooling function is provided, but weight increases and efficiency decreases
Solution Approach 1:
The cooling channels are merged with the rotor structure itself, integrating the cooling function into the existing rotor components. This eliminates the need for separate external cooling fans and associated mounting structures, thereby reducing overall machine weight while maintaining effective cooling capability through the integrated channels that direct cooling fluid through the rotor assembly.
Solution Approach 2:
The rotor structure serves dual purposes: it both generates electromagnetic torque and provides its own cooling system through integrated cooling channels. The rotor essentially cools itself by directing cooling fluid through its own structure, eliminating the need for separate external cooling devices and reducing overall system weight.
2Temperature
If conventional cooling methods using airgaps or external cooling fans are employed, then cooling function is provided, but device complexity increases
Solution Approach 1:
The cooling channels are merged with the rotor structure itself, integrating the cooling function into the existing rotor components. This eliminates the need for separate external cooling fans and associated mounting structures, thereby reducing overall machine weight while maintaining effective cooling capability through the integrated channels that direct cooling fluid through the rotor assembly.
Solution Approach 2:
The rotor structure serves dual purposes: it both generates electromagnetic torque and provides its own cooling system through integrated cooling channels. The rotor essentially cools itself by directing cooling fluid through its own structure, eliminating the need for separate external cooling devices and reducing overall system weight.
3Temperature
If radial projections are provided on stator core laminations to cool windings, then contact area increases, but flux leakage occurs and efficiency decreases
Solution Approach 1:
The cooling function is extracted from the stator core structure and relocated to the rotor assembly. By providing cooling channels in the rotor that direct cooling fluid radially outward to cool the windings from the rotor side, the invention avoids the need for radial projections on the stator core, thereby eliminating flux leakage paths while maintaining effective winding cooling.
Solution Approach 2:
Cooling fluid acts as an intermediary medium, being directed through rotor channels to reach the windings and facilitate heat transfer. This intermediary cooling approach allows effective thermal management without requiring direct structural modifications to the stator core that would disrupt magnetic flux paths.
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 reduces weight and component complexity, improves heat transfer efficiency, and maintains electromagnetic torque capability by aligning stator and rotor pole regions, thus overcoming the limitations of existing cooling methods.
Implementation Method 1
the cooling fluid channels provide a flow of cooling fluid in a substantially axial direction through the electric machine to facilitate heat transfer and dissipation from the electromagnetic windings
Implementation Method 2
the cooling fluid channels provide a flow of cooling fluid in a substantially axial direction through the electric machine to facilitate heat transfer and dissipation from the electromagnetic windings
Data Source
AI summary
A variable reluctance electric machine comprising a rotor and a stator; the stator having two or more electromagnetic windings and the rotor having a plurality of salient poles, the salient poles defining axially extending cooling fluid channels; wherein the salient poles and the cooling fluid channels are circumferentially skewed along at least a part of their length whereby in use the cooling fluid channels impel cooling fluid in a substantially axial direction towards the electromagnetic windings and the stator to facilitate heat transfer and dissipation from the windings.