Rotor Magnet Holder Structure for Vibration-Resistant Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rotary electric machines with magnet holders that have a narrower bridge portion than arm portion width suffer from deformation, leading to gaps between magnets and arm portions, increased vibration, and reduced positioning accuracy.
Innovation Solution
A rotary electric machine design featuring a magnet holder with a base portion including an inner and outer annular beam connected by a connection beam, and an arm portion connected to the outer beam, which suppresses deformation and maintains the positioning of magnets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the width of the bridge portion in the circumferential direction is made smaller than the width of the arm portion, then it is intended to suppress opening in the arm portions, but deformation occurs with the bridge portion as a starting point, causing gaps between magnets and arm portions, which worsens vibration suppression and positioning accuracy
Solution Approach 1:
The base portion is segmented into an inner circumferential portion, an outer circumferential beam, and connection beams. This segmentation allows each part to perform its specific function: the inner circumferential portion provides central support, the outer circumferential beam maintains outer dimensional stability, and the connection beams transfer loads between them, preventing deformation while maintaining positioning accuracy.
Solution Approach 2:
Different regions of the base portion are given different structural characteristics. The inner circumferential portion and outer circumferential beam have different geometries and stiffness properties, allowing the structure to resist deformation locally where needed while maintaining overall stability. This local differentiation prevents the deformation that starts at the bridge portion in conventional designs.
2Object-affected harmful factors
If the bridge portion width is reduced, then opening suppression is intended, but deformation starts at the bridge portion causing gaps, which worsens vibration suppression performance
Solution Approach 1:
The inner circumferential portion and outer circumferential beam are merged through the connection beams to form a unified rigid structure. This merging creates a composite base portion that distributes mechanical loads across multiple elements, preventing deformation at any single location including the bridge portion, thereby eliminating gaps that cause vibration.
Solution Approach 2:
The base portion structure transitions from a simple planar connection to a three-dimensional rigid framework involving the inner circumferential portion, outer circumferential beam, and connection beams. This dimensional enhancement provides multiple load paths and increases structural rigidity, preventing deformation while maintaining the ability to suppress opening.
Data Source
AI summary
A rotary electric machine includes a stator, a rotor core provided on an inner circumferential side of the stator and fixed to an output shaft of a rotor, a plurality of magnets arranged in a circumferential direction and fixed to an outer circumferential portion of the rotor core, and a magnet holder fixing the magnets to the outer circumferential portion of the rotor core, the magnet holder includes a base portion through which the output shaft is inserted, and an arm portion connected to the base portion, and the base portion includes an inner circumferential portion having an annular shape, an outer circumferential beam which has an annular shape and is provided on an outer circumferential side of the inner circumferential portion and to which the arm portion is connected, and a connection beam connecting the inner circumferential portion and the outer circumferential beam.