Rotor Shaft Guide Design for Permanent Magnet Fixation
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Solution Overview
Problem
The existing methods for manufacturing rotors of permanent magnet surface affixation-type rotating machines are costly due to high machining workload and require special screws for narrow magnet spacings, increasing costs further.
Innovation Solution
A rotor design featuring cylindrical guides extending axially and positioned at regular intervals on the rotor shaft, with projection portions of the guides fixed using ring jigs or adhesive, allowing for easy placement and fixation of pre-magnetized permanent magnets without the need for special screws or machining grooves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If magnet fixing grooves are formed by directly machining the rotor shaft or by attaching a silicon steel sheet core formed with grooves, then magnets can be fixed to the rotor shaft, but the machining workload and cost increase
Solution Approach 1:
The invention divides the rotor structure into modular components: the rotor shaft body and separate magnet fixing plates. These plates are attached to the rotor shaft surface and contain pre-formed grooves for magnet insertion, eliminating the need to machine grooves directly into the rotor shaft. This segmentation transfers the grooving operation to separate, easily manufactured components.
Solution Approach 2:
The invention introduces magnet fixing plates as intermediary components between the rotor shaft and the magnets. These plates serve as mediators that provide the groove structure needed for magnet fixation without requiring direct machining of the rotor shaft itself, thereby simplifying the overall manufacturing process.
2Manufacturing precision
If guides are used to determine magnet positions in the circumferential direction, then magnet positioning accuracy improves, but special screws are required for narrow spacings which increases cost
Solution Approach 1:
The invention merges the guiding function and the fixing function into a single integrated component. The magnet fixing plates contain both the grooves for magnet insertion and the guiding structures for positional accuracy, eliminating the need for separate guide components and their associated special fasteners.
Solution Approach 2:
The magnet fixing plates perform multiple functions simultaneously: they provide structural support for magnet attachment, establish precise circumferential positioning through their groove geometry, and serve as the mounting interface for magnets. This multi-functionality eliminates the need for specialized single-purpose components.
Data Source
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AI summary
Provided are rotor of permanent magnet surface affixation-type rotating machine and its manufacturing method, where permanent magnets previously magnetized are easily fixable at proper positions while restricting cost. In rotor of permanent magnet surface affixation-type rotating machine, including cylindrical rotor shaft 11, columnar guides 13 extending along axial direction of rotor shaft 11 and disposed in circumferential direction at regular intervals, and permanent magnets 12 previously magnetized and installed on surface of rotor shaft 11 and between the adjacent guides 13, axial length of guide 13 is formed longer than that of region where permanent magnets 12 are installed, guide 13 is disposed on surface of rotor shaft 11 such that guide 13 projects toward both sides in axial direction from region where permanent magnets 12 are installed, and projection portions 13a, 13b projecting in axial direction from region where permanent magnets 12 are installed are fixed to rotor shaft 11.