Laminated Core Radial Cooling Ducts for Electric Machine Heat Dissipation
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Solution Overview
Problem
Conventional electric machines face inefficiencies in heat dissipation due to long heat transport paths and undesired heat transfers, particularly when cooling ducts are external to the laminated core, which impairs effective cooling and can lead to side effects like oil accumulation in the rotor and air gap.
Innovation Solution
A laminated core design with internal cooling ducts that open radially to the outside and inside, allowing for direct flow of cooling fluid through the core, reducing heat transport paths and enhancing heat dissipation by maintaining the cooling fluid within the core, thereby improving cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If cooling ducts are arranged external to the laminated core, then the structure is simpler to manufacture, but heat transport path becomes long and cooling efficiency deteriorates
Solution Approach 1:
The cooling duct is nested within the laminated core structure, with the duct positioned in the radial direction through the yoke region. This nesting approach allows the cooling system to be integrated into the core without adding external components, thereby shortening the heat transport path while maintaining manufacturing feasibility through standard lamination stacking processes.
Solution Approach 2:
The cooling duct is arranged in the radial direction rather than axially, utilizing the radial dimension of the laminated core. This dimensional change enables the cooling fluid to flow directly through the yoke region where heat generation occurs, significantly reducing the heat transport path and improving cooling efficiency without complicating the manufacturing process.
2Device complexity
If cooling ducts run outside the laminated core, then the cooling system is easier to implement, but undesired heat transfers occur and oil accumulation side effects arise
Solution Approach 1:
The harmful effect of oil accumulation is eliminated by extracting the cooling duct from the external environment and placing it entirely within the laminated core. The cooling fluid is confined to the internal duct, preventing it from entering the air gap and rotor, thereby eliminating the side effects while maintaining a relatively simple cooling system implementation.
Solution Approach 2:
The cooling duct is positioned specifically in the yoke region of the laminated core, targeting the area where heat accumulation is most problematic. This localized approach allows effective heat removal from the core without requiring the cooling fluid to traverse the entire machine, reducing the risk of oil accumulation in other regions while keeping the cooling system simple.
3Ease of repair
If cooling fluid flows through external ducts, then the cooling system is easier to access for maintenance, but heat transport path increases and cooling efficiency decreases
Solution Approach 1:
The cooling system is designed with the understanding that while the duct position is fixed within the core for optimal heat transport, the cooling fluid flow rate and temperature can be dynamically adjusted to maintain high cooling efficiency. This dynamic control compensates for the reduced accessibility, allowing the system to achieve high productivity through optimized fluid parameters rather than physical accessibility.
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 enables effective and efficient heat transport from the laminated core, allowing for high performance and continuous operation of the electric machine by maintaining the cooling fluid within the core, reducing heat transport paths and minimizing side effects.
Implementation Method 1
at least one cooling duct (14, 15) which runs within the laminated core (7, 9) and can be flowed through by a cooling fluid for cooling the laminated core (7, 9)... a particularly high quantity of heat can be transported from the laminated core in a short time
Implementation Method 2
heat transport from the laminated core... heat can be transported effectively and efficiently away from the laminated core
Data Source
AI summary
A laminated core for an electric machine has at least one cooling duct which runs within the laminated core and can be flowed through by a cooling fluid for cooling the laminated core. The cooling duct has at least one first throughflow opening which can be flowed through by the cooling fluid and penetrates an outer circumferential-side shell face of the laminated core, which shell face points toward the outside in the radial direction of the laminated core. The cooling duct further has at least one second throughflow opening which can be flowed through by the cooling fluid and penetrates an inner circumferential-side shell face of the laminated core, which shell face points toward the inside in the radial direction of the laminated core.