Stator End-Face Inserts for Electric Machine Vibration Damping
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Solution Overview
Problem
The existing stator designs of electric machines face challenges in effectively managing vibrations caused by the rotating force of the rotor, which can lead to structural instability and reduced performance.
Innovation Solution
The introduction of inserts with specific shapes, such as triangular, rounded, or radially extended tips, bonded to the stator end face between adjacent slots, which are compressed by end windings, enhancing structural integrity and vibration mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple laminations are stacked to form the stator, then the stator can be assembled with available components, but vibrations occur during operation due to rotor rotation
Solution Approach 1:
An insert is introduced as an intermediary component between the laminations and the end windings. This insert has a rounded tip that extends radially outward and engages with the end windings, serving as a mediator to transmit compressive forces uniformly across the lamination stack and reduce vibrations.
Solution Approach 2:
The insert is positioned and bonded to the end face of the laminations before the end windings are placed. This pre-positioning allows the insert to be in place to receive and distribute compressive forces from the end windings, cushioning the lamination stack against vibrations before they fully develop during operation.
2Object-affected harmful factors
If end windings are bent over inserts, then compression force is exerted on laminations to reduce vibrations, but the insert shape must be precisely controlled
Solution Approach 1:
The insert features a rounded tip at its radial outer end, which engages with the bent end windings. This curved geometry allows the end windings to naturally conform to the insert shape when bent over it, distributing compression forces more evenly and reducing sensitivity to minor manufacturing variations compared to a sharp or flat tip.
Solution Approach 2:
The insert is designed with specific dimensional parameters including a radial length longer than the slot length and a rounded tip radius. These parameter changes optimize the engagement between the insert and end windings, allowing effective vibration reduction while maintaining manufacturability within standard tolerances.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The use of these inserts improves the structural stability of the stator by distributing compression forces evenly, thereby reducing vibrations and enhancing the overall performance and durability of the electric machine.
Implementation Method 1
The use of these inserts improves the structural stability of the stator by distributing compression forces evenly, thereby reducing vibrations
Data Source
AI summary
An electric machine includes a plurality of laminations stacked to form a stator defining an end face and a plurality of slots spaced about a circumference of the stator. The electric machine further includes a plurality of inserts each disposed, and bonded to a portion of the end face, between an adjacent pair of the slots, and each defining an outer triangular-shaped tip that is radially outside the adjacent pair of the slots. The electric machine further includes end windings extending out from the adjacent pair of the slots and bent over a corresponding one of the inserts such that the end windings engage the corresponding one of the inserts and exert a compression force on the corresponding one of the inserts and the laminations.