C-Shaped Stator Element Alignment via Non-Magnetic Bridge
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Solution Overview
Problem
The alignment and assembly of stator elements in electrical machines with c-shaped cores are complicated by tolerance issues, leading to larger air gaps and reduced precision, which affects the machine's performance and reliability.
Innovation Solution
Moulding non-magnetic bridges onto the poles of c-shaped stator elements to secure and align them precisely, creating a unitary stator with a small air gap and well-defined saliencies, simplifying assembly and enhancing rotor alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If c-shaped cores are used to achieve high fill-factor and easier winding, then manufacturing ease is improved, but alignment precision deteriorates due to tolerance issues
Solution Approach 1:
A non-magnetic bridge component is introduced as an intermediary element to connect and align the C-shaped stator cores. The bridge includes alignment features such as protrusions fitting into recesses or keyed interfaces that precisely position the stator cores relative to each other, eliminating alignment errors caused by tolerances in the C-shaped cores themselves.
Solution Approach 2:
The alignment features are pre-formed on the stator cores and bridge component during manufacturing. The precise geometric relationships are established in advance through precision machining or molding of the alignment features, so that when assembly occurs, the alignment is automatically achieved without requiring complex adjustment procedures.
2Reliability
If larger air gap is provided to accommodate tolerance in alignment, then reliability is improved by allowing free rotation, but magnetic performance deteriorates due to increased reluctance
Solution Approach 1:
The non-magnetic bridge serves as a mediator that provides precise alignment between stator cores, enabling the air gap to be minimized for optimal magnetic performance while still accommodating tolerance variations through the precision alignment features built into the bridge structure.
3Ease of manufacture
If stator elements are assembled as separate components, then ease of manufacture is improved, but assembly complexity increases due to simultaneous alignment requirements
Solution Approach 1:
The bridge component acts as an intermediary that pre-establishes the spatial relationships between stator elements. This allows stator elements to be manufactured separately and then quickly assembled together through simple insertion or attachment to the bridge, eliminating the need for complex simultaneous alignment procedures.
Solution Approach 2:
The alignment features are pre-formed on the stator cores and bridge component during manufacturing. The precise geometric relationships are established in advance through precision machining or molding of the alignment features, so that when assembly occurs, the alignment is automatically achieved without requiring complex adjustment procedures.
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 approach allows for precise alignment and assembly of stator elements, reducing air gap reluctance, improving rotor start-up conditions, and enabling accurate sensor positioning, thereby enhancing the electrical machine's performance and simplifying the assembly process.
Implementation Method 1
The air gap between the rotor and the stator is ideally as small as possible so as to reduce reluctance
Data Source
Figure 1
Figure 2
AI summary
A stator comprising a plurality of stator elements, each stator element comprising a c-shaped core having two poles. Each pole of each stator element is secured to a pole of an adjacent stator element by a bridge formed of a non-magnetic material moulded onto the poles.