Rotor Short-Circuit Cage Support Ring Casting
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Solution Overview
Problem
Existing methods for producing rotors for asynchronous machines struggle to balance electrical conductivity and mechanical stability, often requiring significant additional material and energy expenditure, and are prone to mechanical deformation under centrifugal forces.
Innovation Solution
A rotor design featuring a laminated core with a short-circuit cage integrated into the core, where the short-circuit rings are supported by cast-on or cast-in support rings made from different materials, providing a mechanically stable and electrically conductive structure without the need for additional processing steps, such as bonding or welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If substitution of materials is carried out to improve electrical conductance values, then electrical conductance is improved, but mechanical stability deteriorates
Solution Approach 1:
The patent employs composite material construction where short-circuit rings made of electrically conductive material (such as copper or aluminum) are integrated with support rings made of mechanically strong material (such as steel). This composite structure allows the electrically conductive material to provide high electrical conductance for the short-circuit cage, while the mechanically strong support rings provide the necessary mechanical stability to withstand centrifugal forces during rotor operation, thus resolving the contradiction between electrical conductance and mechanical stability.
2Strength
If increasing mechanical stability is pursued, then mechanical stability is improved, but production expenditure increases
Solution Approach 1:
The patent merges the functions of mechanical support and electrical conduction into a single integrated component structure. The support rings are designed to work in conjunction with the short-circuit rings as a unified assembly, eliminating the need for separate mechanical reinforcement components. This integration allows the rotor to achieve high mechanical stability while maintaining cost-effective production through standardized manufacturing processes for the combined structure.
3Productivity
If support rings are integrated through casting process, then production time is reduced, but manufacturing precision may deteriorate
Solution Approach 1:
The patent incorporates support rings into the rotor assembly during the initial casting process of the short-circuit rings, rather than adding them as separate components afterward. This preliminary integration ensures that the support rings and short-circuit rings form a precisely fitted unified structure from the outset, eliminating subsequent assembly steps and potential alignment errors. The casting process itself is designed to achieve the required dimensional accuracy and surface finish for the integrated components.
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 design enhances mechanical stability and allows for a wider selection of materials, reducing production costs and time while preventing mechanical deformation under centrifugal forces, thus improving the reliability and efficiency of asynchronous machines.
Implementation Method 1
a respective support ring is constructed as a structure which is cast onto or into the respective short-circuit ring in a positively locking and/or materially joined fashion
Data Source
AI summary
A rotor for an asynchronous machine has a laminated core and a short-circuit cage at least partially integrated in the laminated core. The short-circuit cage is designed with rods having or consisting of a first electrically conductive material and short-circuit rings having or consisting of a second electrically conductive material. At least one of the short-circuit rings is designed with a support ring, and each support ring is designed as a structure interlockingly and/or integrally cast onto or into the associated short-circuit ring.