Armature Coil Holder Cooling for Rotating Machine End Turns
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rotating electrical machines face challenges in efficiently cooling the end portions of coils, leading to reduced performance and increased temperature, which can result in decreased efficiency and reliability.
Innovation Solution
The design incorporates a holder member with thermally coupled end portions to dissipate heat generated by the armature coil, utilizing air or water cooling, and includes a slot-less structure with a polar anisotropic magnet unit and flattened conductor structure to minimize magnetic saturation and eddy currents, enhancing torque density and cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional cooling passages are used in rotating electrical machines, then the side portion of the coil can be cooled efficiently, but the end portions of the coil remain insufficiently cooled leading to heat accumulation
Solution Approach 1:
The holder member is designed to serve dual functions: mechanically holding the armature coil in position and thermally conducting heat away from the coil end portions. By integrating the cooling function into the existing holder structure rather than adding separate cooling components, the patent achieves efficient end portion cooling without increasing overall system complexity
Solution Approach 2:
The holder member acts as a thermal intermediary between the armature coil end portions and the external cooling system. It conducts heat from the coil ends to the cooling passages where coolant flows, enabling efficient heat transfer from locations that were previously difficult to cool
2Power
If traditional coil structures with slots are used, then manufacturing is simpler, but magnetic saturation occurs reducing torque density
Solution Approach 1:
The armature coil is divided into multiple independent coil parts, each with its own end portions that can be independently held and cooled by the holder member. This segmentation allows for optimized magnetic field distribution without requiring traditional slots, reducing magnetic saturation while maintaining manufacturability through modular assembly
Solution Approach 2:
The patent changes the structural parameters of the coil from traditional slotted configurations to a slot-less design with multiple coil parts. This parameter change eliminates magnetic saturation issues associated with slots while the holder member provides the necessary mechanical support and positioning that would otherwise require complex manufacturing processes
3Loss of energy
If conventional coil windings are used, then manufacturing is easier, but eddy currents are generated reducing efficiency
Solution Approach 1:
The coil is constructed from multiple discrete coil parts rather than continuous windings, which interrupts eddy current paths and reduces eddy current losses. The holder member maintains proper positioning of these segmented coil parts, achieving energy efficiency without requiring complex winding processes
Solution Approach 2:
The patent changes the winding configuration from conventional continuous windings to a segmented structure with specific geometric arrangements. This parameter change reduces eddy current generation while the holder member provides the mechanical framework that would otherwise require elaborate winding processes to achieve proper geometry
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 configuration effectively dissipates heat from the armature coil ends, improves torque characteristics, and reduces magnetic saturation, resulting in increased efficiency and reliability of the rotating electrical machine.
Implementation Method 1
The first portion of the holder member is thermally coupled to the first end portion of the armature coil. The second portion of the holder member is thermally coupled to the second end portion of the armature coil
Implementation Method 2
the heat dissipated to the holder member may be air-cooled to be discharged outward or may be water-cooled to be discharged outward
Data Source
AI summary
In a rotating electrical machine, a holder member is disposed to be radially closer to an armature coil than to a magnetic field generator. The holder member is configured to hold the armature coil. The holder member has a first portion that faces a first end portion of the armature coil, and a second portion that faces a second end portion of the armature coil. The first portion of the holder member is thermally coupled to the first end portion of the armature coil. The second portion of the holder member is thermally coupled to the second end portion of the armature coil.