Stator End Cap and Insulation Film Layout for Bubble-Free Casting
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Solution Overview
Problem
Conventional stators in electric machines are prone to overheating due to air bubbles in the casting process, which negatively affect thermal behavior and can lead to inefficient heat dissipation.
Innovation Solution
The stator design incorporates a stator core with end caps that have winding wire supports with projections, and an insulation film that extends between these projections to prevent axial forces on the insulation film, thereby avoiding deformation and air bubble formation during casting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional casting method is used for stator production, then manufacturing simplicity is maintained, but air bubbles form in the casting which negatively influence thermal behavior and cause overheating
Solution Approach 1:
The insulation film is pre-installed on the stator tooth before the casting process, creating a protective barrier in advance that prevents air bubble formation during subsequent manufacturing steps. This preliminary protective measure ensures that the casting material flows smoothly without trapping air, thereby eliminating the harmful effect of air bubbles while maintaining reliable thermal behavior.
Solution Approach 2:
The insulation film acts as an intermediary element between the stator tooth and the casting material. It mediates the interaction by providing a smooth, non-stick surface that allows the casting material to flow uniformly without entrapping air bubbles. This intermediary layer protects the stator tooth while ensuring good thermal contact with the casting, resolving the contradiction between manufacturing simplicity and thermal reliability.
2Reliability
If insulation film is used between winding wire and stator tooth, then insulation is provided, but axial forces may deform the insulation film and create air bubbles during casting
Solution Approach 1:
The insulation film is designed as a flexible thin film that can accommodate minor dimensional variations and forces during the casting process. Its flexibility allows it to conform to the stator tooth surface and resist deformation from axial forces, maintaining its insulating function while preventing air bubble formation. The thin film structure provides adequate insulation without creating rigid constraints that would lead to deformation.
3Manufacturing precision
If end caps with projections are used to support winding wire, then winding wire positioning is improved, but the design complexity of end caps increases
Solution Approach 1:
The end cap is designed with local projections only at the specific locations where winding wire support is needed, rather than modifying the entire end cap structure. These localized projections provide precise positioning for the winding wire while minimizing the overall complexity of the end cap design. The rest of the end cap maintains its simple, conventional structure, thus achieving improved manufacturing precision without excessive device complexity.
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
This design enhances thermal behavior by preventing air bubble formation and ensuring good heat transfer between the stator winding and the stator core, leading to improved power capacity and efficiency.
Implementation Method 1
ensuring good heat transfer between the stator winding and the stator core
Data Source
AI summary
A stator comprises a stator core having stator teeth, a first end cap and second end cap which each have a base and a winding wire support, wherein the end caps are arranged on the same stator tooth so that the bases are directed toward front sides of the stator tooth, and a stator winding having a wire which is wound over the end caps around the stator tooth. The winding wire support has two projections which project at opposite sides over the base. The wire extends over the projections of the end caps. An insulation film comprises front edges and extends between one of the projections of the first end cap and the opposite projection of the second end cap. The film is arranged between the wire and the stator tooth. The wire extends over the projections without applying any force action to the front edges of the film.