End Shield Shoulder Segmentation for Stator Holding
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Solution Overview
Problem
Conventional rotary electric machine brackets with holding portions extending over the entire circumference can cause short circuits due to close proximity with visible portions, limiting the machine's radial size and increasing weight.
Innovation Solution
A bracket design with a plate and axially extending skirt featuring a shoulder that forms a discrete axial stop, extending only over a portion of the skirt's circumference, providing focused stator immobilization and reducing assembly tolerances, weight, and risk of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the holding portion extends over the entire circumference of the stator body, then the stator is effectively held and immobilized, but the radial size of the machine increases and the visible portions may cause short circuits
Solution Approach 1:
The holding portion is segmented into discrete zones rather than extending continuously. The shoulder is divided into multiple axial stops positioned at specific circumferential locations, creating localized holding zones that concentrate immobilization forces where needed while leaving gaps that reduce radial interference with visible portions.
Solution Approach 2:
The bracket structure transitions from uniform circumferential support to non-uniform localized support. The shoulder provides enhanced holding capability at specific axial positions where stator immobilization is critical, while reducing material presence in other radial zones to prevent short circuits and minimize machine size.
2Reliability
If the holding portion extends over the entire circumference, then the stator is securely held, but the weight of the bracket increases
Solution Approach 1:
The continuous holding portion is segmented into discrete axial stops at specific circumferential positions. This segmentation removes unnecessary material from non-critical zones, directly reducing bracket weight while preserving holding functionality at the segmented stopping positions where stator immobilization is required.
Solution Approach 2:
The bracket structure implements local quality by concentrating material and holding capability at specific axial positions rather than distributing it uniformly. The shoulder provides enhanced holding where stator immobilization is critical, while reducing material presence in other zones, thereby reducing overall bracket weight without compromising reliability.
3Object-affected harmful factors
If the visible portions are kept far from the brackets to prevent short circuits, then electrical safety is improved, but the radial size of the machine increases
Solution Approach 1:
The holding portion is segmented into discrete zones rather than extending continuously. This creates localized holding areas that provide sufficient electrical clearance from visible portions while maintaining effective stator immobilization at the segmented positions, thus preventing short circuits without increasing overall radial dimensions.
Solution Approach 2:
The bracket structure implements local quality by concentrating holding capability at specific axial positions with reduced radial extent. This localized approach creates adequate electrical clearance zones from visible portions to prevent short circuits, while the concentrated holding zones maintain effective stator immobilization without increasing machine radial size.
4Length of moving object
If the shoulder extends over a portion of the circumference only, then the assembly tolerances are reduced and radial size is minimized, but the stator holding may be insufficient
Solution Approach 1:
The holding portion is segmented into multiple discrete axial stops positioned at optimized circumferential locations. This segmentation creates multiple localized holding points that collectively provide sufficient stator immobilization while maintaining reduced radial size and relaxed assembly tolerances compared to a continuous holding portion.
Data Source
AI summary
An end shield for a rotary electric machine includes a plate which extends generally transversely in relation to an axis (X), and a skirt which extends generally axially from the plate. The skirt has at least one shoulder which forms an axial stop, the shoulder being intended to axially block a stator body of the rotary electric machine. The shoulder extends only over a portion of the circumference of the skirt.