Cast Copper Alloy Rotor for Asynchronous Machines
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Solution Overview
Problem
Current copper alloys for cast squirrel cage rotors in asynchronous machines lack a favorable combination of strength, conductivity, and castability, with existing alloys either compromising on electrical conductivity or mechanical strength, and there is a need for compositions that avoid harmful elements like lead and cadmium.
Innovation Solution
A copper alloy composition featuring 0.05 to 0.5% Ag, 0.05 to 0.5% of at least two elements from Ni, Zn, Sn, and Al, with optional additions of Mg, Ti, Zr, B, P, As, and Sb, optimized to balance strength and conductivity while ensuring castability and reducing gas absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If alloying elements are added to increase strength, then mechanical strength is improved, but electrical conductivity deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the concentration ranges of alloying elements (Ag: 0.05-0.5%, Ni: 0.05-0.5%, Zn: 0.05-0.5%, Sn: 0.05-0.5%, Al: 0.05-0.5%) to achieve optimal balance between strength and conductivity. This quantitative parameter optimization resolves the contradiction by finding the sweet spot where mechanical properties are enhanced while electrical conductivity remains acceptable
Solution Approach 2:
The patent creates a composite copper alloy material combining multiple elements (Ag, Ni, Zn, Sn, Al) with copper base metal. This multi-element composite approach allows synergistic effects where each element contributes differently to strength and conductivity, enabling the material to achieve both high mechanical strength and satisfactory electrical conductivity that cannot be obtained with single-element additions
2Strength
If alloying elements are added to increase strength, then mechanical strength is improved, but castability deteriorates
Solution Approach 1:
The patent optimizes castability by controlling the total alloying content and individual element concentrations within specific ranges. The balanced composition (0.05-0.5% for each element) prevents excessive alloying that would worsen castability while still achieving strength enhancement, resolving the contradiction between strength improvement and manufacturing ease
3Object-affected harmful factors
If harmful elements like lead and cadmium are avoided, then environmental safety is improved, but available alloying options for strength enhancement are reduced
Solution Approach 1:
The patent extracts and eliminates harmful elements (Pb, Cd) from the alloy composition while retaining only beneficial elements (Ag, Ni, Zn, Sn, Al) that enhance strength without environmental harm. This selective removal resolves the contradiction by proving that high strength can be achieved through clean alloying without relying on toxic elements
Solution Approach 2:
The patent compensates for the removal of harmful elements by optimizing the concentrations of beneficial elements within specific ranges. The controlled parameter ranges for Ag, Ni, Zn, Sn, and Al ensure sufficient strength enhancement is achieved even without Pb and Cd, resolving the contradiction between environmental safety and strength requirements
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
The alloy achieves a significant increase in strength compared to pure copper while maintaining electrical conductivity close to that of pure copper, with improved castability and reduced gas absorption, making it suitable for high-performance squirrel cage rotors with lower metal costs.
Implementation Method 1
the strength of pure copper is to be increased through solid solution solidification
Implementation Method 2
They can also reduce gas absorption by deoxidizing the melt
Data Source
AI summary
The invention relates to a copper alloy having the following composition (in % by weight): in each case 0.05 to 0.5% of at least three elements selected from the group consisting of Ag, Ni, Zn, Sn and Al, remainder Cu and unavoidable impurities, optionally 0.01 to 0.2% of one or more elements selected from the group consisting of Mg, Ti, Zr, B, P, As, Sb. The invention also relates to a current-carrying structural part made of a copper alloy and also to a cage rotor having a plurality of conductor bars and two short-circuiting rings, which are cast in one piece from a copper alloy.