Compressor Motor Insulator Cover Locking in Through-Grooves
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Solution Overview
Problem
The engagement of an insulating cover with a tubular insulator in a motor-driven compressor is unstable due to insufficient engagement of engaging portions on the insulator, leading to potential detachment and reduced reliability.
Innovation Solution
The insulator includes guide grooves and through-grooves that guide connecting wires, with engaging portions on the through-grooves' bottom surfaces to ensure stable attachment of a cover, enhancing insulation and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulator is designed with engaging portions at the end opposite to the stator core, then the connection between cover and insulator is established, but the engagement amount is insufficient due to insulator deformation, resulting in unstable attachment
Solution Approach 1:
The engaging portions are positioned on the bottom surfaces of the through-grooves rather than at the end face of the insulator. This preliminary positioning ensures that the engaging portions are located in a region that experiences minimal deformation when tension is applied to the connecting wires, thereby maintaining sufficient engagement amount and stable attachment before the insulator deforms under load.
Solution Approach 2:
The insulator is designed with different functional zones: the through-grooves provide wire routing paths, while their bottom surfaces provide engagement locations. This local differentiation ensures that engaging portions are situated in a specific region (bottom surfaces) that maintains structural stability and sufficient engagement capability, distinct from other regions of the insulator that may experience different stress distributions.
2Stability of the object's composition
If the insulator deforms under tension of connecting wires, then the insulator bends inward radially, but the displacement at the end opposite to the stator core becomes too large, reducing engagement effectiveness
Solution Approach 1:
The engaging portions are pre-positioned on the bottom surfaces of the through-grooves, which are located closer to the stator core end of the insulator. This preliminary positioning takes advantage of the fact that this region experiences less radial displacement during deformation, thereby maintaining the geometric stability needed for effective engagement while allowing the rest of the insulator to deform as needed.
Solution Approach 2:
The insulator structure is designed with localized functional features: the bottom surfaces of the through-grooves serve as stable engagement zones that maintain their position and shape characteristics even when other parts of the insulator deform under tension. This local quality differentiation ensures that the engaging portions remain in positions suitable for maintaining geometric stability.
Data Source
AI summary
Projections are provided on bottom surfaces of U-phase through-grooves. This configuration ensures a sufficient engagement amount of each projection with a corresponding insertion portion as compared to a case in which the projections are provided on the end of an insulator on the side opposite to a stator core. As a result, each projection is stably engaged with the corresponding insertion portion. This allows the cover to be stably attached to the insulator.