Stator, motor, and compressor
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Solution Overview
Problem
In compressors, the neutral lines and lead wires of the stator prevent an adequate gap between coils, leading to insufficient passage cross-sectional area for refrigerant flow, causing oil to escape due to increased flow velocity.
Innovation Solution
A stator design with a stator core, insulators, and coils where feeder lines and neutral lines are connected in specific regions to create a larger passage area, ensuring the center of gravity of the feeder line connections is above that of the neutral line connections, thereby increasing the passage cross-sectional area and reducing refrigerant flow velocity, preventing oil escape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If neutral lines and lead wires are fixed to an upper insulator without orderly separation, then the stator structure is simplified, but the passage cross-sectional area between coils becomes insufficient
Solution Approach 1:
The patent divides the insulator into distinct functional regions: a first region for connecting feeder lines and a second region for connecting neutral lines. This segmentation allows orderly arrangement of electrical connections, preventing them from occupying coil gaps and ensuring adequate passage cross-sectional area for refrigerant flow.
2Reliability
If neutral lines and lead wires prevent adequate gap between coils, then electrical connections are secured, but refrigerant flow velocity increases causing oil escape
Solution Approach 1:
The patent positions the first region (feeder line connections) axially above the second region (neutral line connections) by arranging the center of gravity of the first region above the center of gravity of the second region in the axial direction. This vertical arrangement in the axial dimension allows electrical connections to be organized without interfering with the radial gap between coils, thereby maintaining adequate passage area and controlling refrigerant flow velocity.
Data Source
AI summary
A stator includes a stator core having a plurality of teeth, an insulator, a plurality of coils, a first region in which distal ends of feeder lines are connected to each other, and a second region in which distal ends of neutral lines are connected to each other. The insulator has inner and outer walls spaced from each other in a radial direction. In a cross section at a gap between two adjacent coils, along a plane including an axis of the stator core, a center of gravity of the first region is positioned above a center of gravity of the second region in an axial direction. B<A and C<A, where a radial length of the first region is B, a radial length of the second region is C, and a radial length between the inner wall and the outer wall of the insulator is A.