Rotor Yoke Ridge Structure for Accurate Magnet Assembly
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Solution Overview
Problem
Conventional rotors with magnet holders become complex and increase the number of parts, leading to potential deterioration in assembly workability.
Innovation Solution
A rotor design featuring a cylindrical yoke with magnets arranged circumferentially on its radially inner surface, utilizing integral ridge portions with protrusions and extensions to position the magnets, thereby simplifying the configuration and reducing the number of parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a holder dedicated to positioning a magnet is arranged on the rotor, then magnet positioning accuracy is improved, but device complexity increases and the number of parts increases
Solution Approach 1:
The patent merges the magnet positioning function into the rotor body itself by forming protrusions directly on the rotor surface. This eliminates the need for a separate holder component, thereby maintaining accurate magnet positioning while reducing device complexity and part count. The protrusions are formed as integral parts of the rotor through processes like machining or additive manufacturing.
Solution Approach 2:
The rotor body is given multiple functions: it serves both as the rotating component and as the magnet positioning structure. The protrusions on the rotor surface simultaneously provide mechanical support and precise positioning for the magnets, eliminating the need for dedicated positioning holders and reducing overall system complexity.
2Manufacturing precision
If a holder dedicated to positioning a magnet is arranged on the rotor, then magnet positioning accuracy is improved, but assembly workability deteriorates
Solution Approach 1:
By combining the positioning function into the rotor body itself via protrusions, the number of components to be assembled is reduced. This simplifies the assembly process and improves workability while maintaining precise magnet positioning, as the protrusions are already integrated into the rotor structure.
3Device complexity
If the number of parts is reduced by eliminating the holder, then device complexity is reduced, but magnet positioning accuracy may deteriorate
Solution Approach 1:
The protrusions are formed directly on the rotor body with precise dimensions and positions, ensuring accurate magnet positioning even without a separate holder. The integration of the positioning feature into the main rotor structure maintains manufacturing precision while reducing overall device complexity.
Data Source
AI summary
A rotor rotatable about a central axis extending in an axial direction includes a yoke that is a cylindrical magnetic body extending in the axial direction. A plurality of ridge portions of the yoke are connected to one axial end of the yoke cylindrical portion in a cylindrical shape and extending in the axial direction, and are arranged at intervals in the circumferential direction. In each ridge portion, a protrusion protrudes radially inward from one axial end of the yoke cylindrical portion. Further, an extension extends in the other axial direction from the radially inner end of the protrusion along the radially inner surface of the yoke cylindrical portion. A magnet is located between the extensions adjacent to each other in the circumferential direction. The ridge portion is integral with the yoke cylindrical portion to define a single structure.