Additively Bonded Squirrel-Cage Rotor Rings for High-Speed Stability
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Solution Overview
Problem
Existing squirrel-cage rotors in asynchronous machines face deformation issues due to low mechanical strength and centrifugal forces at high rotational speeds, leading to increased complexity and costs in stabilization measures.
Innovation Solution
The rotor bars are interconnected by short-circuit rings applied directly to the end faces of the rotor body using additive manufacturing methods, forming a stable bond with materials like copper or steel, enhancing resistance to centrifugal forces and allowing higher rotational speeds with reduced material and production complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional materials like copper or aluminum are used for short-circuit rings, then electrical conductivity is improved, but mechanical strength deteriorates leading to deformation at high rotational speeds
Solution Approach 1:
The patent applies composite materials by combining a metal base material (providing mechanical strength) with conductive material layers (providing electrical conductivity). The short-circuit rings are produced as composite structures with at least two different base materials, where one material provides structural integrity and another provides electrical conductivity, thereby resolving the contradiction between electrical conductivity and mechanical strength
Solution Approach 2:
The patent changes the material parameters by using additive manufacturing to create gradient structures and composite compositions. The material composition and microstructure are optimized to achieve both high electrical conductivity and high mechanical strength simultaneously, rather than relying on conventional single-phase materials
2Stability of the object's composition
If protective disks or supporting elements are added to stabilize short-circuit rings, then mechanical stability is improved, but device complexity and production costs increase
Solution Approach 1:
The patent merges the stabilization function into the short-circuit ring structure itself by producing composite structures with integrated reinforcement. Instead of adding separate protective disks or supporting elements, the stabilizing features are combined with the short-circuit rings through additive manufacturing, creating a unified structure that provides both electrical function and mechanical stability
Solution Approach 2:
The short-circuit rings are designed to be self-stabilizing through their composite structure and geometry optimized via additive manufacturing. The rings inherently resist centrifugal forces at high rotational speeds without requiring external protective elements, thereby simplifying the overall device structure while maintaining mechanical stability
3Ease of manufacture
If additive manufacturing is used to apply short-circuit rings directly to rotor body, then production complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies preliminary action by preparing the rotor body surface and designing the short-circuit ring geometry in advance to ensure precise fit and alignment. The additive manufacturing process parameters are pre-optimized to achieve the required dimensional accuracy and surface quality, allowing direct application to the rotor body without subsequent complex machining or adjustment operations
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 method enables rotors to operate at higher speeds with improved mechanical stability and simplified production, reducing deformation risks and costs.
Implementation Method 1
the short-circuit rings are applied to the end faces of the cylindrical rotor body directly via an additive manufacturing method
Implementation Method 2
the exposed short-circuit rings, therefore tend to deform due to centrifugal forces
Data Source
AI summary
A rotor of a squirrel-cage motor and a method for producing the same, wherein the rotor has a squirrel cage winding, and rotor bars of the squirrel cage winding extend in the axial direction through a cylindrical rotor body and are interconnected by end rings at respective end faces of the rotor body, and where the end rings are applied directly to the end faces of the cylindrical rotor body via an additive manufacturing method.