Insulated Droplet-Built Stator Cores for Lower Eddy Current Loss
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Solution Overview
Problem
The fabrication of laminated stator cores for electric machines is complex, labor-intensive, and costly, limiting the efficiency and design flexibility of motors due to constraints in magnetic circuit configurations and difficulty in incorporating cooling mechanisms, especially in vibration-sensitive applications.
Innovation Solution
A system and method for creating a material with insulated boundaries using a droplet spray subsystem to form molten alloy droplets and a gas subsystem to introduce reactive gases, forming insulation layers on the droplets, which are then deposited to create a material with domains and insulated boundaries, facilitating the production of high-performance stator cores with improved magnetic properties and reduced eddy current losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional laminated stator cores are fabricated by stacking individually laminated thin sheet-metal elements, then eddy current losses are reduced, but the fabrication process becomes complicated, labor-intensive, and costly
Solution Approach 1:
The patent merges multiple separate manufacturing operations (cutting, coating, assembling) into a single integrated process by forming the stator core as one continuous piece using metal spraying techniques, eliminating the need to individually laminate and assemble multiple thin sheet-metal elements while maintaining eddy current loss reduction through the insulating layer
Solution Approach 2:
The patent replaces the mechanical assembly process of stacking and fastening individual laminations with a metallurgical deposition process where molten or semi-molten metal droplets are sprayed and deposited to form a monolithic structure, significantly simplifying manufacturing
2Reliability
If individual sheet-metal elements are coated with insulating layers and assembled, then magnetic flux path is maintained, but design flexibility is restricted
Solution Approach 1:
The patent enables dynamic and complex magnetic circuit configurations by allowing the stator core to be formed as a single piece with arbitrary three-dimensional geometries using metal spraying, freeing the design from the rigid constraints of laminated sheet-metal assembly while maintaining magnetic flux path integrity through the continuous structure
3Loss of energy
If laminated stator core geometry is constrained to align magnetic flux with laminations, then eddy current losses are minimized, but cooling incorporation becomes difficult
Solution Approach 1:
The patent segments the stator core into a monolithic sprayed structure that allows internal cooling channels to be integrated directly into the core geometry, separating the magnetic flux path function from the cooling function while maintaining both performance requirements through the flexible metal spraying process
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 approach enables the production of stator cores with enhanced magnetic permeability, low coercivity, and high saturation induction, while minimizing eddy current losses and allowing for more efficient cooling and design flexibility, thus improving motor performance and reducing manufacturing costs.
Implementation Method 1
a droplet spray subsystem configured to create molten alloy droplets and direct the molten alloy droplets to a surface
Implementation Method 2
a gas subsystem configured to introduce one or more reactive gases to an area proximate in-flight droplets. The one or more reactive gases create an insulation layer on the droplets in flight
Data Source
AI summary
A system for forming a bulk material having insulated boundaries from a metal material and a source of an insulating material is provided. The system includes a heating device, a deposition device, a coating device, and a support configured to support the bulk material. The heating device heats the metal material to form particles having a softened or molten state and the coating device coats the metal material with the insulating material from the source and the deposition device deposits particles of the metal material in the softened or molten state on the support to form the bulk material having insulated boundaries.