Segmented Rotor Magnets for Stable EV Motor Torque
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Solution Overview
Problem
The magnetic performance of permanent magnets in motor rotors needs improvement to enhance the output torque and reliability of electric vehicle motors and powertrains, as current integrated structures face issues with uneven magnetic fields, difficulty in process control, and performance inconsistency.
Innovation Solution
The permanent magnets in the motor rotor are divided into multiple adjacently arranged magnetic steels, with varying coercive forces and remanences, allowing for adjustable distributions based on application scenarios, and widths are used to distinguish and control these properties to prevent misalignment and reduce processing difficulties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the permanent magnet is of an integrated structure with local diffusion of heavy rare earth elements, then the distribution of coercive force and remanence can be adjusted, but performance consistency of the permanent magnet is adversely affected and the magnetic field of the motor becomes uneven
Solution Approach 1:
The permanent magnet is divided into multiple magnetic steels arranged adjacently in the first direction. Each magnetic steel has different coercive force and remanence values, allowing independent adjustment of magnetic properties without affecting overall consistency. This segmentation enables precise control of magnetic field distribution while maintaining performance uniformity across the permanent magnet structure.
2Adaptability or versatility
If the permanent magnet is of an integrated structure with local diffusion, then coercive force and remanence distribution can be adjusted, but difficulty in process control and performance detection is further increased
Solution Approach 1:
Dividing the permanent magnet into discrete magnetic steels simplifies process control compared to local diffusion methods. Each magnetic steel can be independently manufactured and characterized, making performance detection more straightforward. The adjacent arrangement allows for systematic assembly and quality control while maintaining the desired magnetic property distribution.
3Adaptability or versatility
If different arrangement manners of permanent magnets are used, then adaptability to different application scenarios is improved, but the complexity of determining coercive force and remanence distribution increases
Solution Approach 1:
The segmented structure of multiple magnetic steels provides a modular approach that can be adapted to different arrangement manners (e.g., radial, axial, or skewed arrangements). The first direction can be oriented differently relative to the motor axis depending on the application, while the fundamental principle of having magnetic steels with varying coercive forces and remanences remains consistent, simplifying the determination process across different configurations.
Solution Approach 2:
Each magnetic steel is assigned specific coercive force and remanence values tailored to its local position and function within the permanent magnet structure. This local quality approach allows optimization for different application scenarios without requiring complex global redesign, as each segment can be independently optimized for its specific role.
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 improves the consistency and anti-demagnetization performance of the permanent magnets, reducing torque fluctuations and processing costs while maintaining optimal magnetic field distribution.
Implementation Method 1
A motor is an important component of the powertrain, and is configured to convert electric energy into mechanical energy
Implementation Method 2
A permanent magnet in a motor rotor is one of factors that affect an output torque of the motor
Data Source
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AI summary
This application provides a motor, a powertrain, and a vehicle. A motor rotor of the motor includes a plurality of permanent magnets, and the plurality of permanent magnets are arranged at intervals. Each permanent magnet includes a plurality of magnetic steels, and the plurality of magnetic steels are adjacently arranged in a first direction. A coercive force of one of the plurality of magnetic steels is unequal to a coercive force of another magnetic steel, remanence of the one magnetic steel is unequal to remanence of still another of the plurality of magnetic steels, a width of the one magnetic steel in the first direction is unequal to both a width of the another magnetic steel and a width of the still another magnetic steel, and the first direction is perpendicular to an axial direction of the motor. In this application, a magnitude of a coercive force and a magnitude of remanence are distinguished by using widths of the plurality of magnetic steels, to help flexibly adjust a distribution of magnetic performance of a permanent magnet, and further reduce wrong sorting of the plurality of magnetic steels due to mixed materials.