Fluoropolymer Bonding for Electric Machine Stator Laminations
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Solution Overview
Problem
Electric machine components, particularly stator cores, face deterioration when exposed to corrosive chemicals at high temperatures due to the degradation of traditional adhesives used for bonding, leading to compromised structural integrity and increased maintenance costs.
Innovation Solution
The method involves using fluoropolymer films, such as FEP, PFA, or PTFE, to bond metallic laminations in electric machines, where the laminations are positioned with the fluoropolymer in between and then clamped and heated above the melting temperature to form a strong, chemical-resistant bond.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional adhesives are used to bond metallic laminations, then the bonding process is simple and cost-effective, but the adhesive degrades when exposed to corrosive chemicals at high temperatures, compromising structural integrity
Solution Approach 1:
The patent changes the bonding method from chemical adhesive bonding to thermal bonding using fluoropolymer films. The fluoropolymer is heated above its melting point to bond the laminations, creating a bond that withstands corrosive chemicals and high temperatures where traditional adhesives would degrade
Solution Approach 2:
The patent uses fluoropolymer films (such as PTFE, PFA, or FEP) as a bonding material that combines the properties of being chemically inert to corrosive substances while maintaining bonding capability at high temperatures, creating a composite bonding solution that overcomes the limitations of traditional organic adhesives
2Reliability
If fluoropolymer films are used to bond laminations, then corrosion resistance and structural integrity are improved, but the bonding process complexity increases due to additional steps required
Solution Approach 1:
The bonding process is segmented into distinct sequential steps: positioning laminations with fluoropolymer film between them, clamping to apply pressure, heating above the melting point to activate bonding, and cooling to set the bond. This segmentation makes the complex process more controllable and manufacturable
Solution Approach 2:
The bonding mechanism utilizes the phase transition of the fluoropolymer from solid to molten state when heated above its melting point, allowing the material to flow and bond the laminations together, then solidifies upon cooling to create a strong, corrosion-resistant bond
3Manufacturing precision
If multiple laminations are bonded together, then the lamination density and core strength are improved, but the manufacturing time and process complexity increase
Solution Approach 1:
The fluoropolymer films are pre-positioned between laminations before assembly, and multiple laminations are stacked in sequence with fluoropolymer layers in between. This preliminary preparation allows for efficient batch processing where multiple layers can be assembled before the heating step, improving manufacturing throughput
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 provides a durable and corrosion-resistant bond that maintains structural integrity even at extreme temperatures, reducing maintenance costs and adhesive-related issues, while allowing for efficient manufacturing with minimal mess and high lamination density.
Implementation Method 1
the temperature of the fluoropolymer can be increased above the melting temperature for bonding the first and the second metallic stator laminations
Data Source
AI summary
The present specification describes systems, methods, and apparatuses for bonding core laminations for electric machines (e.g., stators, actuators, sensors, etc.) using fluoropolymer films. A first metallic lamination can be aligned together with a second metallic lamination with a fluoropolymer in-between. The first and the second metallic laminations can be bonded together with the fluoropolymer. The first and second metallic laminations can be aligned with the fluoropolymer in-between below the melting temperature of the fluoropolymer. The first metallic stator lamination can be clamped to the second metallic stator lamination to fix the relative position. Thereafter, the temperature of the fluoropolymer can be increased above the melting temperature for bonding the first and the second metallic stator laminations.