Rotor Magnet Cover Assembly That Shields Magnets From Caulking Loads
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Solution Overview
Problem
Existing rotors with permanent magnets face issues of assembly strength inferior to caulking fixation, and caulking loads can damage or degrade the magnets.
Innovation Solution
A rotor design with a load reception block between the flange part and the rotor core, which absorbs caulking loads, preventing direct impact on the permanent magnets, and includes features like annular parts, legs, and locking claws to secure magnet position and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the magnet cover is fixed to the rotor core by caulking, then the assembly strength is improved, but the permanent magnet may be damaged or degraded due to large caulking loads
Solution Approach 1:
A load reception block is introduced as an intermediary component between the magnet cover and the rotor core. This block reception block receives the caulking load from the magnet cover and transmits it to the rotor core, preventing direct transmission of large caulking loads to the permanent magnet while maintaining strong assembly fixation
Solution Approach 2:
The fixation structure is segmented into multiple components: the magnet cover, the load reception block, and the rotor core. This segmentation allows the load reception block to specifically handle the caulking load, isolating the permanent magnet from direct mechanical stress while maintaining overall assembly strength
2Ease of manufacture
If a bent piece is used to fix the magnet cover to the rotor core, then the assembly work is easy, but the assembly strength is inferior to caulking fixation
Solution Approach 1:
The load reception block is prepared in advance with a through-hole positioned at a specific height. This preliminary preparation allows the insertion pin to be easily inserted through the pre-positioned hole, combining the ease of insertion with strong mechanical fixation, eliminating the need for complex bent piece operations
Data Source
AI summary
A rotor is provided with: a rotor core (32); a plurality of permanent magnets (33); a substantially tubular magnet cover (71); and a load reception block (70). The rotor core (32) rotates integrally with a rotary shaft of a motor. The permanent magnets (33) are arranged on the outer peripheral part of the rotor core (32). The magnet cover (71) covers the exterior of the plurality of permanent magnets (33) and the rotor core (32), and has a flange part which is bent radially inward at the end along a rotation axis. The load reception block (70) is disposed between the flange part and the end surface of the rotor core (32) in a direction along the rotation axis, and abuts against the flange part and the rotor core (32).