Monolithic Rotor Assembly via Additive Manufacturing
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Solution Overview
Problem
Traditional methods for manufacturing electrical machines are inefficient and limited in producing complex components with precise features, leading to issues like eddy current losses and increased assembly costs due to multiple sub-components and joints.
Innovation Solution
The use of additive manufacturing techniques, such as 3D printing, to fabricate electrical machine components like stators and rotors by layering materials, allowing for integrated construction of complex shapes and varied material properties, reducing eddy current losses and assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional stacking and winding methods are used to manufacture rotor components, then assembly flexibility is maintained, but manufacturing precision and structural integrity deteriorate due to multiple joints and sub-components
Solution Approach 1:
The patent merges multiple rotor components (rotor shaft, rotor core, rotor winding, and housing) into a single monolithic structure manufactured by additive manufacturing. This eliminates the need for stacking lamination sheets and winding coils separately, removing multiple joints and sub-components while improving structural integrity and manufacturing precision.
Solution Approach 2:
The additive manufacturing process enables a single component to perform multiple functions that traditionally required separate parts. The monolithic rotor assembly integrates structural support, magnetic core functions, electrical winding pathways, and housing features, reducing the overall number of components needed in the rotor assembly.
2Productivity
If multiple sub-components are assembled to form rotor components, then ease of repair is improved, but productivity deteriorates due to time-consuming assembly processes
Solution Approach 1:
By combining rotor shaft, rotor core, rotor winding, and housing into one monolithic component, the patent eliminates the assembly process entirely for these parts, dramatically improving productivity. The single additive-manufactured component requires no joining, stacking, or winding operations during assembly.
3Loss of energy
If conventional manufacturing methods are used for rotor components, then material selection flexibility is maintained, but loss of energy deteriorates due to eddy current losses from laminated structures
Solution Approach 1:
The monolithic structure eliminates the laminated sheet construction that causes eddy current losses. By manufacturing the rotor core as a single continuous piece rather than stacked laminations, the patent reduces the pathways for eddy currents, thereby reducing energy losses while maintaining material flexibility through additive manufacturing.
Solution Approach 2:
The patent changes the structural parameter from laminated sheets with insulation layers to a monolithic continuous structure. This parameter change eliminates the eddy current pathways present in laminated structures, reducing energy losses while the additive manufacturing process maintains flexibility in material selection.
4Manufacturing precision
If traditional manufacturing processes are used for rotor components, then manufacturing cost is controlled, but manufacturing precision deteriorates due to limitations in producing complex features
Solution Approach 1:
The patent replaces traditional mechanical manufacturing processes (stacking, winding, joining) with additive manufacturing technology. This substitution enables the creation of complex geometries and features that are difficult or impossible to achieve with conventional methods, improving manufacturing precision for complex features while the additive process integrates multiple operations into a single manufacturing step, potentially reducing overall cost.
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 creation of components with reduced eddy current losses, lower assembly costs, and enhanced performance by integrating multiple parts into single, monolithic components with intricate features, improving the overall efficiency and accuracy of electrical machine manufacturing.
Implementation Method 1
printing a first part of a rotor shaft... printing a rotor core onto the first part of the rotor shaft... printing a second part of the rotor shaft onto the rotor core
Implementation Method 2
The 3D printing process comprises fusing metal using laser energy or heat
Implementation Method 3
fusing metal using laser energy or heat
Data Source
AI summary
A method for manufacturing a rotor assembly for an electrical machine includes printing a first part of a rotor shaft. The method also includes printing a rotor core onto the first part of the rotor shaft. In addition, the method includes printing a second part of the rotor shaft onto the rotor core; printing a first part of the rotor winding. The method also includes coupling the first part of the rotor winding to the rotor core. After coupling the first part of the rotor winding to the rotor core, the method includes printing a second part of the rotor winding onto the first part of the rotor winding to form the rotor assembly.