Motor Rotor Magnet Fixation Using Non-Magnetic Fastening
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Solution Overview
Problem
Existing motor rotor designs face issues with permanent magnets detaching due to external factors like temperature and humidity changes, leading to reduced motor lifespan and poor assembly precision, which increases costs and reduces yield.
Innovation Solution
A motor rotor design featuring a turning axle with magnetic members having first and second fastening portions, where the fastening members are non-magnetically permeable sheet metal or plastic, allowing for secure fixation without screws and minimizing assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If permanent magnets are fixed to the turning axle by gluing, then the assembly process is simple, but the permanent magnets may fall off due to temperature and humidity changes
Solution Approach 1:
The patent divides the fixation function into two independent parts: gluing for initial positioning and mechanical fastening structures (coupling slots and fastening bolts) for secure retention. This segmentation allows each method to perform its specialized function, with gluing providing initial bond and mechanical structures preventing detachment under environmental stress.
Solution Approach 2:
The gluing process performs preliminary action by initially bonding the permanent magnets to the turning axle before the mechanical fastening structures are applied. This preliminary fixation holds the magnets in correct positions during assembly, after which the fastening bolts provide long-term reliable retention.
2Reliability
If coupling slots are formed on the turning axle to assemble permanent magnets, then the mechanical fixation is improved, but the fabrication precision variations cause permanent magnets to crack during assembly
Solution Approach 1:
The patent applies beforehand cushioning by using gluing as a buffer between the permanent magnets and the coupling slots. The glue layer absorbs and cushions the mechanical stress and precision mismatches that would otherwise be directly transmitted to the fragile permanent magnets during assembly, preventing cracking while still enabling reliable mechanical fixation.
3Strength
If fastening bolts are used to secure permanent magnets in coupling slots, then the fixation strength is improved, but the assembly complexity and cost increase
Solution Approach 1:
The patent merges multiple fixation functions into integrated components. The fastening bolts serve dual purposes: securing the permanent magnets in the coupling slots and simultaneously fixing the end cover plates to the turning axle. This merging reduces the total number of fastening elements needed and simplifies the assembly process.
Solution Approach 2:
The end cover plates are designed with multi-functionality, serving both as protective covers for the magnet assembly and as structural elements that are fastened to the turning axle using the same fastening bolts that secure the permanent magnets. This universality reduces component count and assembly complexity.
4Reliability
If end cover plates are added to prevent permanent magnets from falling off, then the reliability is improved, but the assembly cost and complexity increase
Solution Approach 1:
The end cover plates are merged with the fastening bolt assembly process. The same fastening bolts that secure the permanent magnets to the coupling slots also fasten the end cover plates to the turning axle. This merging of functions means the end cover plates are added without requiring additional fastening elements or separate assembly operations.
Solution Approach 2:
The end cover plates serve multiple functions: they protect the permanent magnet assembly, provide structural closure to the turning axle, and are fastened using the existing fastening bolt mechanism. This multi-functionality justifies their addition by providing reliability improvements without proportionally increasing complexity.
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 design enhances the fixation of magnetic members, reduces assembly costs, and improves yield by preventing cracking and displacement due to external factors, thereby extending motor rotor lifespan.
Implementation Method 1
two fastening members (15) coupled to the two end surfaces of the turning axle (11) respectively... wherein the fastening members are non-magnetically permeable sheet metal or plastic
Data Source
AI summary
A motor rotor is provided. The motor rotor includes a plurality of magnetic members circumferentially disposed on a peripheral wall surface of a turning axle of the motor rotor, and both end surfaces of the turning axle are coupled with fastening members respectively; each of the magnetic members has a first fastening portion formed at each of its two ends; and the fastening member is provided with a plurality of second fastening portions corresponding in position to the first fastening portions, such that each of the magnetic members are firmly fixed in position to the turning axle.