Maglev Bearing Stator Assembly Without Shrink-Fit Deformation
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Solution Overview
Problem
The shrink-fitting technique for fixing the stator core in the housing of magnetic levitation bearings results in uncontrollable dimensional deformation and increased tolerances of form and position, leading to poor control accuracy and potential safety hazards.
Innovation Solution
A stator design for magnetic levitation bearings that includes a stator core, a stator coil, a housing with a clearance or transition fit, and a potting component filled between the housing and the stator core, which provides axial and circumferential positioning without deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shrink-fitting technique is used to fix the stator core in the housing, then the stator core is secured in position, but the housing and stator core undergo uncontrollable dimensional deformation and increased tolerances
Solution Approach 1:
The invention divides the fixation function into two independent parts: (1) a positioning structure with positioning protrusions and positioning grooves that provides precise initial positioning, and (2) a sealing structure with sealing protrusions and sealing grooves that provides secure fixation. This segmentation allows each structure to optimize its function without compromising the other, avoiding the deformation problems of shrink-fitting.
Solution Approach 2:
The invention extracts the positioning function from the housing-stator core interface and implements it through dedicated positioning protrusions and grooves on the stator core. Similarly, the sealing function is extracted and implemented through separate sealing structures. This extraction eliminates the need for shrink-fitting deformation to achieve positioning and sealing.
2Strength
If interference fit is used between housing and stator core, then the stator core is firmly fixed, but the stator core is deformed and tolerances of form and position increase
Solution Approach 1:
The fixation strength is achieved through multiple distributed positioning protrusions (typically 2-4) and sealing protrusions around the stator core perimeter, rather than through uniform interference fit. This distributes the mechanical stress and prevents localized deformation while maintaining firm fixation.
Solution Approach 2:
The positioning protrusions and sealing protrusions act as intermediary elements between the housing and stator core, providing the necessary mechanical connection without requiring direct interference fit. These intermediaries transfer and distribute forces evenly, preventing stator core deformation.
3Manufacturing precision
If clearance fit or transition fit is used between housing and stator core, then deformation is reduced, but axial and circumferential positioning becomes insufficient
Solution Approach 1:
The positioning protrusions and sealing protrusions are pre-formed on the stator core before assembly with the housing. These pre-formed features ensure that when the stator core is installed in the housing, the positioning and sealing functions are immediately activated without requiring additional deformation or adjustment, thereby maintaining both precision and reliability.
Solution Approach 2:
The invention adds circumferential positioning capability through positioning protrusions that extend around the stator core perimeter, complementing the axial positioning. This multi-dimensional positioning approach (axial + circumferential) achieves reliable positioning without requiring interference fit, allowing clearance or transition fit to be used.
Data Source
AI summary
The present disclosure relates to a stator of a magnetic levitation bearing, a magnetic levitation bearing, and a compressor. The stator of the magnetic levitation bearing includes a stator core (4), a stator coil (5) wound around the stator core (4), a housing (2) sleeved outside the stator core (4) and having a clearance fit or a transition fit with the stator core (4), and a potting component (3) filled between the housing (2) and the stator core (4).