Rotor Protruding Webs for High-Speed Stability
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Solution Overview
Problem
Reluctance rotors with cut-outs in laminated cores suffer from weakened mechanical stability, which restricts their use at high rotary speeds due to impaired magnetic flux efficiency and mechanical stability issues.
Innovation Solution
A rotor design featuring a laminated core with layers stacked axially, where flux barriers are filled with a non-ferromagnetic casting compound and lamination regions have inwardly protruding webs that extend partially in the axial direction, enhancing mechanical stability and magnetic flux conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cut-outs are made in rotor laminations to create flux barriers, then magnetic pole formation is improved, but mechanical stability is weakened
Solution Approach 1:
The patent applies composite materials by filling the flux barriers with a non-ferromagnetic casting compound (such as plastic or resin) that combines with the laminated core structure. This composite approach allows the flux barriers to maintain their magnetic function while the casting compound provides mechanical support and stability to the laminated core, resolving the contradiction between magnetic pole formation and mechanical stability.
Solution Approach 2:
The casting compound acts as an intermediary material that fills the cut-outs and provides mechanical reinforcement. It mediates between the magnetic requirements (flux barriers) and mechanical requirements (stability), allowing both functions to coexist by transferring mechanical loads away from the weakened lamination structure while maintaining the magnetic flux barrier functionality.
2Strength
If synthetic resin is used to fill flux barriers with dovetail joints, then mechanical stability is improved, but magnetic flux efficiency is impeded
Solution Approach 1:
The patent applies local quality by making the casting compound non-ferromagnetic in the flux barrier regions where magnetic flux efficiency is critical. This localized material property selection ensures that the filling material provides mechanical support without interfering with magnetic flux conduction, unlike the previous dovetail joint design that extended into magnetic paths.
Solution Approach 2:
The patent changes the dimensional approach by having the casting compound fill only the flux barrier cut-outs without creating protruding joint structures that extend radially. This dimensional modification eliminates the interference with magnetic flux paths while maintaining mechanical stability through proper filling of the barrier regions.
3Strength
If lamination regions are connected by dovetail joints with synthetic resin, then mechanical stability is improved, but device complexity increases
Solution Approach 1:
The patent merges the functions of mechanical connection and flux barrier filling into a single integrated casting compound filling operation. Instead of separate dovetail joint structures and filling operations, the non-ferromagnetic casting compound simultaneously provides mechanical reinforcement and flux barrier functionality, simplifying the overall structure and manufacturing process.
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 improves mechanical stability and efficiency by creating enlarged boundary surfaces for positive engagement with the casting compound, reducing displacement and maintaining flux barrier dimensions under high forces, thus enabling high-quality, high-efficiency operation at high rotary speeds.
Implementation Method 1
creating enlarged boundary surfaces for positive engagement with the casting compound
Implementation Method 2
fastened lamination regions are present which each have a web inwardly protruding into the casting compound
Implementation Method 3
a laminated core which extends in an axial direction from a first axial end to a second axial end, wherein the laminated core includes layers stacked in the axial direction
Implementation Method 4
at least one flux barrier is filled with a non-ferromagnetic casting compound
Data Source
AI summary
A rotor for an electrical machine includes a laminated core with stack of sheets extending in an axial direction from a first axial end to a second axial end. The stack of sheets has layered layers in the axial direction. Each layer has a plurality of sheet areas with flow conduction blocks situated between adjacent sheet areas. At least one flow conduction block is cast with a non-ferromagnetic potting compound. The potting compound extends in the at least one flow conduction block from the first axial end to the second axial end. Fastened sheet areas, respectively, having at least one web protrudes into the potting compound. The protruding web, at least in part, extends in a direction, having a component in the axial direction. In each layer, at least one sheet area is a fastened sheet area.