Slot-Liner Cage With Self-Retaining Lock For Electric Machine Stator
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Solution Overview
Problem
The existing stator designs for electric machines with annular stator bodies and pocket-type winding slots face difficulties in accessing and mounting slot-liner elements due to spatial constraints and the need for complex assembly, especially when windings protrude axially or laterally beyond the stator body.
Innovation Solution
A slot-liner cage with interrupted circumferential cage rings featuring a self-retaining lock geometry, allowing for a dimensionally unstable configuration that can be easily mounted by opening the cage rings to insert slot-liner elements into winding slots, and then sealing them with a positive closure mechanism to prevent autonomous opening, using indentations and bulges for a spring/groove connection and additional projections for improved stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual slot-liner elements are inserted into the orifice regions of pocket-type winding slots, then the winding slots are sealed toward the interior of the ring, but the mounting becomes elaborate and difficult due to poor accessibility
Solution Approach 1:
Multiple individual slot-liner elements are merged into a single integrated slot-liner cage structure with circumferential cage rings. This allows all slot-liner elements to be mounted simultaneously as one component rather than individually, greatly simplifying the mounting process while maintaining the sealing function for all winding slots.
Solution Approach 2:
The slot-liner cage is segmented into multiple slot-liner elements arranged in sequence between cage rings, allowing the cage to be flexibly adapted to the stator geometry while maintaining structural integrity. The segmentation enables the cage to conform to the circular arrangement of winding slots.
2Stability of the object's composition
If the slot-liner cage is constructed to be dimensionally stable, then the structure provides rigidity, but inserting the cage into the stator body becomes difficult due to accessibility constraints
Solution Approach 1:
The slot-liner cage transitions from a flexible, adaptable state during insertion to a stable, rigid state during operation. The cage can be temporarily deformed or flexed to fit through access points, then maintains its dimensional stability once installed to ensure proper sealing and structural support.
Solution Approach 2:
The slot-liner cage is designed to be inserted into the hollow cylindrical interior of the stator ring, nesting the cage structure within the stator body's internal space. This allows the cage to be positioned from the interior without requiring external access to the winding slots.
3Strength
If the cage rings are continuous, then the slot-liner cage maintains structural integrity, but the cage cannot be easily opened for mounting and may autonomously open
Solution Approach 1:
The continuous cage rings are segmented at specific locations to create interruptions that allow the cage to be opened and closed during mounting. These interruptions are strategically placed to maintain structural integrity in the closed position while enabling easy assembly and disassembly when needed.
Data Source
AI summary
A stator of an electric machine has an annular stator body with a multiplicity of winding slots. The winding slots protrude into the stator body in the manner of a pocket from a ring interior. Respective windings are disposed in the winding slots and the slots are sealed toward the ring interior with slot-liner elements. The slot-liner elements of all the winding slots are combined to form a slot-liner cage. The slot-liner cage is formed with circumferential cage rings at the ends of the slot-liner elements. The cage rings have an interruption at a circumferential point. The circumferential point has a self-retaining lock geometry which prevents an autonomous opening of two intermeshing ring ends of the cage rings.