Stator Attachment Mechanism Using T-Slots to Eliminate Back Iron Compressive Stress
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Solution Overview
Problem
The existing stator attachment methods in electric machines, particularly in electric vehicle motors, introduce compressive stresses in the back iron of the stator, which affect the magnetic properties and efficiency of the motor, leading to reduced driving range due to inefficiencies.
Innovation Solution
A stator attachment mechanism using T-slots and T-nuts is introduced, allowing bolts to extend through the case and engage with the stator's attachment points, providing structural stability without compressive stresses by creating a clearance fit between the stator and case, except at specific attachment points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the stator is press fit into the case to maintain structural strength, then the stator can withstand rotational forces, but compressive stresses are introduced in the back iron affecting magnetic properties and efficiency
Solution Approach 1:
The attachment mechanism is segmented into discrete attachment points with T-slots rather than a continuous press fit. This allows the stator to be attached at specific locations while maintaining clearance elsewhere, providing structural strength where needed without creating compressive stresses across the entire back iron surface.
Solution Approach 2:
The attachment mechanism applies local quality by creating a clearance fit between the stator and case except at specific attachment points. The T-slots are strategically positioned to provide localized structural support while the surrounding areas maintain clearance, preventing unwanted compressive stresses in the back iron.
2Stability of the object's composition
If the stator is press fit into the case, then the stator remains fixed and prevents rotation, but motor efficiency decreases due to compressive stresses
Solution Approach 1:
The attachment mechanism is segmented into discrete attachment points with T-slots rather than a continuous press fit. This allows the stator to be attached at specific locations while maintaining clearance elsewhere, providing structural strength where needed without creating compressive stresses across the entire back iron surface.
Solution Approach 2:
The attachment mechanism applies local quality by creating a clearance fit between the stator and case except at specific attachment points. The T-slots are strategically positioned to provide localized structural support while the surrounding areas maintain clearance, preventing unwanted compressive stresses in the back iron.
Data Source
AI summary
A stator system for an electric vehicle motor may include a stator forming a back iron and a plurality of teeth extending inwardly therefrom, the stator including a plurality of attachment points protruding radially outwardly from the back iron, and a case configured to house the stator and defining a plurality of case openings, each configured to receive one of the attachment points, wherein each attachment point defines at least one T-slot configured to receive a nut that cooperates with a bolt extending through the case to connect the case to the stator.