Electrical Steel Lamination with Localized Magnetic Permeability Control
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Solution Overview
Problem
Conventional electric machine rotor and stator lamination cores have homogeneous magnetic properties, limiting the optimization of magnetic field shaping and flux redirection, which affects torque generation and efficiency in electric machines.
Innovation Solution
A method to create laminations with regions of varying magnetic permeability by selectively applying non-ferrous elements to specific areas of the substrate, inducing phase transformations to stabilize non-ferromagnetic austenite phases, and forming alloys with lower magnetic permeability, allowing for localized control of magnetic flux and improved torque density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If homogeneous magnetic properties are used in conventional electric machine rotor and stator lamination cores, then manufacturing simplicity is maintained, but magnetic field shaping and flux redirection are limited
Solution Approach 1:
The patent applies local quality by creating distinct regions within the lamination substrate with different magnetic permeability properties. A first region maintains high magnetic permeability for efficient flux conduction, while a second region has reduced magnetic permeability for flux redirection and leakage control. This spatial differentiation of material properties enables optimized magnetic field shaping and flux management in different areas of the core without requiring completely different structural approaches.
2Productivity
If non-ferrous elements are selectively applied to create regions with varying magnetic permeability, then flux redirection and torque density are improved, but manufacturing process complexity increases
Solution Approach 1:
The patent employs parameter changes by modifying the magnetic permeability parameter of the lamination substrate through selective application of non-ferrous elements. By controlling the concentration and distribution of elements such as aluminum, silicon, or chromium in specific regions, the magnetic permeability is adjusted to create the desired magnetic property gradient. This enables optimization of torque density and flux characteristics through material composition modification rather than structural redesign.
Solution Approach 2:
The patent utilizes composite materials by combining the base ferromagnetic lamination substrate with selectively applied non-ferrous element regions. The resulting structure functions as a composite material system where the interaction between the ferromagnetic substrate and non-ferrous element regions creates the desired magnetic field shaping effects. This approach leverages the complementary properties of different materials to achieve superior magnetic performance.
3Adaptability or versatility
If phase transformation is induced to generate non-ferromagnetic austenite phase in specific regions, then magnetic permeability is reduced for flux barrier functionality, but process complexity and temperature control requirements increase
Solution Approach 1:
The patent applies phase transitions by inducing transformation of the ferromagnetic substrate to non-ferromagnetic austenite phase in specific regions through controlled heating and alloying. The phase transition creates distinct magnetic property regions where the austenite phase provides reduced magnetic permeability for flux barrier functionality. This phase transformation approach enables dynamic control of magnetic properties through temperature management during manufacturing.
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 optimized flux leakage and redirection, enhancing torque density and performance of electric machine cores by creating regions with distinct magnetic properties within the lamination, thereby improving the efficiency and performance of electric machines.
Implementation Method 1
The at least one non-ferrous element from Period 2, 3, 4 may be diffused into the non-ferromagnetic austenite phase to stabilize the non-ferromagnetic phase
Implementation Method 2
inducing a phase transformation of an electrical steel lamination having a predefined magnetic permeability to generate a non-ferromagnetic austenite phase
Data Source
AI summary
A core lamination includes a first region defined by a ferromagnetic electrical steel substrate having a predefined magnetic permeability and a second region having a lower magnetic permeability than the first region, the second region defined by the substrate selectively overcoated with at least one non-ferrous element from Period 2-5, or a combination thereof.