Electric Machine Stator Insulating Plate Radial Shoulders
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Solution Overview
Problem
Existing electric machines with plate stack stators face challenges in easy assembly and maintaining the position of insulating strips between windings, which can lead to electrical short circuits if not properly secured.
Innovation Solution
The electric machine incorporates radially projecting shoulders on insulating plates to serve as axial stops for insulating strips, ensuring they maintain their position during assembly and preventing slipping, with additional features like form-fitting connections and oblique windings for enhanced security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If insulating strips are placed between adjacent windings without additional positioning features, then the assembly process becomes simpler, but the insulating strips cannot maintain their position and may slip, causing electrical short circuits
Solution Approach 1:
The insulating plate serves as an intermediary component between the windings and the positioning system. It provides a stable base structure with integrated radially projecting shoulders that act as axial stops, allowing the insulating strips to be securely positioned without complex assembly procedures. The intermediary plate structure mediates between the simplicity of direct placement and the reliability of secured positioning.
Solution Approach 2:
The radially projecting shoulders are pre-formed on the insulating plate before the windings are assembled. These shoulders create axial stops that preliminarily define the correct position for the insulating strips. This preliminary positioning action ensures that when insulating strips are placed, they automatically assume the correct axial position, preventing slippage during subsequent assembly operations.
2Reliability
If radially projecting shoulders are added to the insulating plate to position insulating strips, then the positioning reliability improves, but the device complexity increases
Solution Approach 1:
The positioning function is merged into the insulating plate structure itself. The radially projecting shoulders are integrated features of the insulating plate, combining the insulation function and the positioning function into a single component. This merging eliminates the need for separate positioning elements, reducing overall device complexity while maintaining reliable insulating strip positioning.
Solution Approach 2:
The insulating plate has different local qualities: the main body provides electrical insulation, while the radially projecting shoulders provide mechanical positioning. This local differentiation of function allows the plate to serve multiple purposes with simple geometric additions. The shoulders are localized features that add positioning capability without requiring complex restructuring of the entire plate.
3Reliability
If insulating strips extend axially over the entire length of windings without stops, then the insulation coverage is sufficient, but the strips cannot be pre-positioned or maintained in place during assembly
Solution Approach 1:
The insulating strips serve themselves by being held in position by the radially projecting shoulders. The shoulders act as self-contained positioning features that automatically maintain the strips in the correct axial position throughout the assembly process. This self-service positioning eliminates the need for external fixtures or complex positioning procedures, making assembly easier while maintaining adequate insulation coverage.
Data Source
AI summary
The invention concerns an electric machine with a stator and a rotor, comprising a plate stack with a plurality of superposed plates with windings which can be energized. Disposed at at least one end of the plate stack is an insulating plate. Furthermore, insulating strips are provided on the plate stack, between adjacent windings, which are supported on radially protruding shoulders on the insulating plate.