Lundell Rotor with Segmented Rectifying Magnet for Flux Control
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Solution Overview
Problem
In motors with Lundell-type rotors, it is difficult to adjust magnetic flux due to the integration of magnets, which limits the flexibility and efficiency of the magnetic field.
Innovation Solution
A rotor design incorporating first and second rotor cores with disk and rectifying magnets, where the rectifying magnet is integrated with the disk magnet in a post-process, allowing for adjustable magnetic flux and reduced component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If all magnets are integrally molded in advance, then the number of components is kept low, but it becomes difficult to adjust the magnetic flux in each portion
Solution Approach 1:
The magnet system is divided into a disk magnet and a rectifying magnet that are integrated in a post-process. This segmentation allows the rectifying magnet to be separately adjusted to control magnetic flux distribution between adjacent claw poles, while the disk magnet provides the base magnetic field. The separation enables independent optimization of each magnet's magnetic properties.
Solution Approach 2:
The rectifying magnet is specifically designed to be located between adjacent claw poles to locally adjust the magnetic flux in those specific regions. By positioning the rectifying magnet only where needed and using different materials with appropriate magnetic permeability, the magnetic flux distribution is optimized locally without affecting the entire magnet system uniformly.
2Adaptability or versatility
If magnets are made from different materials, then magnetic flux adjustment becomes easier, but the manufacturing complexity increases
Solution Approach 1:
The disk magnet and rectifying magnet are prepared separately with their respective materials and magnetic properties optimized in advance. The rectifying magnet is pre-formed with the appropriate material and geometry to achieve the desired magnetic flux adjustment, then integrated with the disk magnet in a post-process, simplifying the overall manufacturing workflow.
Solution Approach 2:
The magnet system uses composite construction with the disk magnet and rectifying magnet made from different materials optimized for their specific functions. The disk magnet uses a material suitable for generating the main magnetic field, while the rectifying magnet uses a material with specific magnetic permeability characteristics for flux adjustment, creating a composite magnetic system with superior overall performance.
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
Facilitates adjustable magnetic flux and enhances motor output by using magnets made from different materials, allowing for easier adjustment and integration while maintaining a low component count.
Implementation Method 1
The disk magnet is magnetized in the axial direction so that the claw-poles of the first rotor core function as first poles and the claw-poles of the second rotor core function as second poles
Implementation Method 2
The rectifying magnet includes at least one of an inter-pole magnet portion and a back-surface magnet portion... The rectifying magnet and the disk magnet are formed from different materials
Data Source
AI summary
A rotor includes first and second rotor cores, a disk magnet, and a rectifying magnet. The first and second rotor cores each include a core base and claw-poles. The disk magnet is magnetized in the axial direction so that the claw-poles of the first rotor core function as first poles and the claw-poles of the second rotor core function as second poles. The rectifying magnet includes at least an inter-pole magnet portion or a back-surface magnet portion. The inter-pole magnet portion is located in a gap formed in the circumferential direction between the claw-poles of the first rotor core and the claw-poles of the second rotor core. The back surface magnet portion is located in a gap formed at back surfaces of the claw-poles. The rectifying magnet and the disk magnet are formed from different materials. The rectifying magnet is integrated with the disk magnet in a post-process.