Multi-phase Magnetic Component with Selective Nitriding
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Solution Overview
Problem
Current magnetic materials used in electric machines face a tradeoff between power density, efficiency, and mechanical load-bearing capability, as they struggle to control saturation magnetization effectively, leading to inefficiencies and design challenges in hybrid and electric vehicle traction applications.
Innovation Solution
A magnetic component with regions of varying nitrogen content, formed through selective nitriding, allows for localized control of saturation magnetization by creating magnetic, partially-magnetic, and non-magnetic regions, enabling precise flux distribution and mechanical integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If traditional ferrous-based magnetic materials are used to increase power density and efficiency, then magnetic flux coupling is improved, but mechanical load-bearing capability and saturation magnetization control are compromised
Solution Approach 1:
The patent applies local quality by creating distinct regions within the magnetic component with different nitrogen contents. High-nitrogen regions (0.1-0.4 wt%) provide reduced saturation magnetization for mechanical strength, while low-nitrogen regions (<0.1 wt%) provide high saturation magnetization for efficient magnetic flux coupling. This spatial variation in material properties resolves the contradiction between power density and mechanical strength.
Solution Approach 2:
The patent creates a composite magnetic material structure by combining regions with different nitrogen concentrations in a single component. The multi-phase structure integrates high-nitrogen and low-nitrogen regions, allowing the component to simultaneously exhibit properties of both: reduced coercivity and saturation in high-nitrogen regions, and high saturation magnetization in low-nitrogen regions, thereby achieving both power density and mechanical strength.
2Strength
If nitrogen content is increased to reduce saturation magnetization in certain regions, then mechanical strength is improved, but magnetic efficiency is reduced
Solution Approach 1:
The patent uses local quality to apply nitrogen enrichment only in specific regions where mechanical strength is needed, while keeping other regions low-nitrogen for optimal magnetic performance. The high-nitrogen regions (0.1-0.4 wt%) provide structural support with reduced saturation magnetization, while low-nitrogen regions (<0.1 wt%) maintain high saturation magnetization for efficient flux coupling, thus resolving the strength-efficiency tradeoff.
3Ease of manufacture
If uniform nitrogen distribution is applied throughout the magnetic component, then manufacturing simplicity is maintained, but localized control of saturation magnetization is lost
Solution Approach 1:
The patent applies segmentation by dividing the magnetic component into distinct regions with different nitrogen contents. The manufacturing process segments the nitriding treatment spatially, creating high-nitrogen and low-nitrogen zones through controlled exposure during heat treatment. This segmentation enables precise localized control of saturation magnetization while maintaining a relatively simple overall manufacturing approach using conventional nitriding equipment and processes.
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 enhances power density and efficiency while maintaining mechanical integrity by optimizing saturation magnetization across different regions, allowing for improved performance in electric machines.
Implementation Method 1
Both the first and second regions have a concentration of carbon, if present, that is less than 0.05 weight % of the respective regions
Implementation Method 2
at least one of the first region and the second region is partially-magnetic and has a nitrogen content in a range from about 0.1 weight % to about 0.4 weight % of that region
Data Source
AI summary
A magnetic component including first and second regions, and a method of varying the magnetization values in different regions of the magnetic component are disclosed. The first and the second regions are characterized by a nitrogen content that is different from each other. At least one of the first region and the second region is partially-magnetic and has a nitrogen content in a range from about 0.1 weight % to about 0.4 weight % of that region. A concentration of carbon, if present, of both the first and second regions is less than about 0.05 weight % of the respective regions.