Additive Laminated Iron Core for Electric Motor Eddy Current Reduction
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Solution Overview
Problem
The existing manufacturing methods for laminated iron cores are complex and prone to eddy current losses, which hinder miniaturization and efficiency in electric motors and transformers, especially at higher operating frequencies.
Innovation Solution
An additive manufacturing method using a selected laser melting process to form laminated iron cores by alternately layering silicon steel metal layers and insulation layers, where the insulation layers are partially melted to reduce eddy currents, allowing for complex shapes and optimized performance without the need for intricate assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional cold-rolled silicon steel sheets are punched and assembled into laminated structures, then magnetic permeability is improved, but manufacturing complexity increases significantly
Solution Approach 1:
The patent combines multiple manufacturing steps (punching, stacking, insulation coating, assembly) into a single additive manufacturing process. The laser selectively melts metal particles layer by layer to directly form the laminated iron core with integrated insulation layers, eliminating the need for separate punching and assembly operations while maintaining high magnetic permeability.
Solution Approach 2:
The patent replaces mechanical punching and assembly operations with laser-based additive manufacturing. The laser selectively melts metal particles to build the laminated structure layer by layer, substituting complex mechanical manufacturing processes with a more efficient thermal processing approach that reduces manufacturing complexity.
2Loss of energy
If single-layer thickness of laminated iron core is reduced to decrease eddy current losses, then eddy current losses are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The additive manufacturing process inherently controls the thickness of each layer through the laser melting depth and particle layering, eliminating the need for separate precision thickness control mechanisms. The process self-regulates the insulation layer thickness by controlling the laser power and scanning parameters, achieving both low eddy current losses and acceptable manufacturing precision.
3Device complexity
If additive manufacturing is used to create block magnetic cores, then manufacturing complexity is reduced, but eddy current losses increase significantly
Solution Approach 1:
The patent segments the magnetic core into multiple thin laminated layers with insulation between them, rather than creating a solid block structure. This segmentation is achieved through selective laser melting that builds the core layer by layer with insulation layers interspersed, reducing eddy current paths while maintaining manufacturing simplicity through additive processing.
Solution Approach 2:
The patent applies different properties to different regions of the magnetic core by selectively melting metal particles only where needed. The laser creates local variations in material density and structure, forming conductive magnetic layers in some areas and insulating layers in others, optimizing both electrical properties and manufacturing efficiency.
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 reduces eddy current losses, enables miniaturization, and improves the magnetic properties of laminated iron cores, enhancing the efficiency and performance of electric motors and transformers.
Implementation Method 1
performing laser scanning on the silicon steel metal particle, so that the silicon steel metal particle is melted layer by layer into at least one silicon steel metal layer
Implementation Method 2
stopping performing the laser scanning on the silicon steel metal particle or reducing a laser power for performing the laser scanning, so that an insulation layer in which the silicon steel metal particle is not fully melted is formed
Implementation Method 3
the insulation film functions as a protective screen against eddy currents, so that eddy currents flow only in a finite closed loop, that is, in the thickness direction of each lamination
Data Source
AI summary
Provided are an electric motor, a laminated iron core, and a manufacturing method. In. an embodiment, the method includes S1: introducing inert gas into an additive manufacturing printing apparatus, pouring silicon steel metal particles into a fanning cylinder of the apparatus, and performing laser scanning on the silicon steel metal particles to gradually melt the silicon steel metal particles into at least one silicon steel metal layer; and S2: continuing to pour silicon steel metal particles into the forming cylinder, and stopping performing laser scanning on the silicon steel metal particles or reducing the laser power executing the laser scanning, such that the silicon steel metal particles do not entirely melt and form an insulating layer. Execution of steps S1 and S2 is alternated until a laminated iron core having a plurality of alternating silicon steel metal layers and insulating layers is formed.