Magnetizing Yoke Structure for High-Flux Rotor Magnetization
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Solution Overview
Problem
The existing techniques for manufacturing rotating electric machines face challenges in easily performing magnetization due to deformation of the magnetizing yoke and magnetic flux leakage, which affects the magnetic flux density and makes it difficult to remove the magnet from the yoke after magnetization.
Innovation Solution
The proposed solution involves a magnetizing yoke with a cylindrical core and slots for the coil, where the magnet section is arranged closer to the d-axis and q-axis, and radially-recessed grooves are formed to prevent coil deformation and contact with the magnet, minimizing magnetic flux leakage and allowing easy removal. Additionally, a temperature regulator and current controller are used to optimize the magnetization process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high current is supplied to the coils to increase magnetic force and achieve saturation magnetization, then the magnetization effect is improved, but the magnetizing yoke deforms and the coils may contact the magnet making removal difficult
Solution Approach 1:
The yoke is divided into multiple segments (first yoke, second yoke, third yoke, fourth yoke) arranged around the magnet. This segmentation allows each segment to independently support the magnetic force without causing overall yoke deformation, preventing coil displacement and magnet entrapment while maintaining effective magnetization.
Solution Approach 2:
Magnetic force generating portions are selectively provided on specific surfaces of the yoke segments (radially inner surfaces facing the magnet). This localized magnetic force generation concentrates the magnetization effect where needed while distributing the mechanical stress, preventing yoke deformation and coil contact issues.
2Reliability
If high current is supplied to the coils to achieve saturation magnetization, then the magnetic flux density is improved, but magnetic flux leakage occurs reducing efficiency
Solution Approach 1:
The yoke is segmented into multiple parts with magnetic force generating portions positioned to create focused magnetic fields. This segmentation directs magnetic flux through intended paths while preventing leakage, improving magnetization efficiency and reducing energy loss.
Solution Approach 2:
The segmented yoke structure acts as an intermediary that guides and contains the magnetic flux between the coils and magnet. By providing structured magnetic force generating portions, it ensures flux follows the desired path rather than leaking, maintaining high magnetic flux density while minimizing energy loss.
3Force
If the coil is allowed to be attracted to the magnet section side during magnetization, then the magnetic force is improved, but the coil deforms and may damage the magnet section
Solution Approach 1:
The yoke is divided into multiple segments that distribute the magnetic attraction forces. This segmentation prevents concentrated forces from deforming the coil or damaging the magnet, while still maintaining sufficient magnetic force for effective magnetization through the segmented magnetic force generating portions.
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 effectively increases the magnetic flux density by preventing coil deformation and magnetic flux leakage, making the magnetization process more efficient and allowing for easier removal of the magnet, while also optimizing the magnetic field strength based on temperature and current control.
Implementation Method 1
The magnetization is performed by supplying electric current to the coils and thereby generating a magnetic field
Implementation Method 2
the coils may be displaced to the magnet side by the magnetic force
Data Source
AI summary
A manufacturing apparatus includes a magnetizing yoke in which a magnet section to be magnetized is installed. The magnetizing yoke includes a core having slots formed at predetermined intervals in a circumferential direction, and a coil received in the slots. When installed with respect to the magnetizing yoke, the magnet section is arranged to face, at locations closer to a d-axis, magnetization surfaces of the core and face, at locations closer to a q-axis, the slots of the core. The magnetization surfaces of the core are formed between the slots adjacent to one another in the circumferential direction. The coil is fixed by a nonmagnetic and elastic fixing material in the slots. On a facing surface of the magnet section which faces the magnetizing yoke, there are radially-recessed grooves formed respectively in q-axis-side portions of the magnet section.