Thermal-Sprayed Winding Head Assembly for Shorter Axial Length
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Solution Overview
Problem
The existing winding head arrangements in electrical rotating machines require significant axial installation space, leading to inefficiencies due to ohmic losses, increased bearing distance, and complex stiffening measures, especially in high-speed machines, and are costly and labor-intensive to produce.
Innovation Solution
A method using thermal spraying processes to connect metallic conductors to an insulating base body via an intermediate layer, made of materials like silver, aluminum, or copper, to form a dense and conductive layer, reducing the need for extensive conductor lengths and simplifying production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional bending and crimping processes are used to create winding heads, then the conductors can be formed to fit into slots, but the axial space requirement increases significantly
Solution Approach 1:
The patent replaces the conventional mechanical bending and crimping process with a thermal spraying process. Conductors are sprayed onto the insulating base body in a molten or semi-molten state, allowing them to conform to the required geometry without mechanical deformation. This substitution eliminates the need for lengthy bending operations and reduces axial space requirements while maintaining the ability to create complex conductor shapes that fit into slots.
Solution Approach 2:
The patent changes the physical state of the conductor material during formation. Instead of using solid conductors that require mechanical bending, the conductors are applied in a molten or semi-molten state through thermal spraying. This parameter change allows the material to flow and conform to the desired shape, then solidifies in place, reducing the axial length required for the winding head formation process.
2Manufacturing precision
If manual connection and insulation processes are used for conductor assembly, then precise connections can be achieved, but production time and labor costs increase
Solution Approach 1:
The patent replaces manual mechanical connection and insulation processes with automated thermal spraying. The thermal spray process simultaneously deposits conductor material and insulating material in a controlled sequence, eliminating manual assembly steps. This automation maintains manufacturing precision through computer-controlled spray deposition while dramatically increasing production speed and reducing labor requirements.
Solution Approach 2:
The patent performs preliminary action by pre-forming the insulating base body with integrated conductor pathways and support structures before applying the conductors. This preliminary preparation allows the thermal spray process to directly deposit conductors in their final positions without requiring subsequent manual assembly, insulation, or reinforcement steps, thereby increasing productivity while maintaining precision.
3Adaptability or versatility
If different conductor geometries are implemented using traditional methods, then design flexibility is achieved, but manufacturing complexity and effort increase
Solution Approach 1:
The patent replaces complex mechanical operations (bending, crimping, soldering) with thermal spraying to achieve different conductor geometries. The thermal spray process can deposit material in various patterns and shapes by controlling the spray gun movement, angle, and deposition parameters, eliminating the need for different mechanical processes for different geometries and reducing manufacturing complexity.
Solution Approach 2:
The patent makes the thermal spraying process universal for creating all conductor geometries. A single thermal spray system can produce various conductor shapes, sizes, and configurations by programming the spray deposition parameters, replacing the need for multiple specialized manufacturing processes and tools that would otherwise be required for different conductor designs.
4Reliability
If longer conductor lengths are used to accommodate winding heads, then connection reliability is improved, but ohmic losses increase
Solution Approach 1:
The patent replaces mechanical bending and assembly processes with thermal spraying, which creates direct, continuous conductor deposits from the insulating base body to the connection points. This eliminates the need for additional conductor length required for mechanical bending and assembly operations, reducing ohmic losses while maintaining connection reliability through the direct thermal bond created during spraying.
Solution Approach 2:
The patent uses the insulating base body as an intermediary structure that integrates conductor support and connection functions. The base body provides built-in support structures and connection points that eliminate the need for separate mechanical assembly components, allowing conductors to be sprayed directly into their final positions with minimal excess length, thereby reducing ohmic losses while ensuring reliable connections.
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 reduces the axial length and weight of the winding head, enhances mechanical and thermal stability, and lowers production costs by enabling a more efficient and flexible manufacturing process.
Implementation Method 1
the conductors are sprayed onto the intermediate layer by means of a first thermal spraying process, in particular by means of cold gas spraying
Implementation Method 2
the intermediate layer is connected to the insulating base body at least via a positive connection
Data Source
Figure 1
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AI summary
The invention relates to a method for producing a winding overhang assembly (24) for an electrical rotating machine (2). The aim of the invention is to provide a winding overhang assembly (24) which, in comparison with the prior art, can be produced more simply and more economically. This aim is achieved, according to the invention, in that the winding overhang assembly (24) has at least one insulating main body (26, 28), which is produced at least partly from a dielectric material, a plurality of conductors (30) made of a metal material being connected to the insulating main body (26, 28) by means of at least one intermediate layer (36) each, the intermediate layer (36) being produced from a material different from the dielectric material and from the metal material, the conductors (30) being sprayed onto the intermediate layer (36) by means of a first thermal spraying process.