Rotating Electrical Machine Coil End Vibration Suppression
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Solution Overview
Problem
Large rotating electrical machines experience significant electromagnetic vibration at the coil end, leading to frictional wear and insulation damage due to asymmetric coil end support structures and nonuniform connection rings, which existing technologies fail to effectively suppress.
Innovation Solution
The introduction of a dummy ring with similar rigidity and mass to the connection ring, made of metal materials, is positioned in alignment with the connection ring to enhance the rigidity and uniformity of the coil end support, lowering the natural frequency and reducing vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coil end support structure is made firmer to suppress vibration, then vibration suppression improves, but structure change is limited due to physical limitations of connection rings and leads
Solution Approach 1:
The patent introduces a dummy ring that copies the structural characteristics of the connection ring without performing electrical functions. This dummy ring is positioned at locations where connection rings are not installed, creating a symmetric structure that improves vibration suppression while maintaining the necessary electrical connectivity through the actual connection rings and leads.
2Stability of the object's composition
If connection rings are added to uniformize the structure in the circumferential direction, then structural uniformity improves, but device complexity increases
Solution Approach 1:
The dummy ring replicates the mechanical support function of connection rings in locations where electrical connection is not required. This allows the structure to achieve circumferential uniformity and symmetry for vibration suppression without adding unnecessary electrical connection components, thus avoiding increased device complexity.
3Strength
If the number of connection rings is increased to enhance rigidity, then rigidity improves, but the natural frequency increases causing larger vibration
Solution Approach 1:
The dummy ring provides additional mechanical support to enhance the rigidity of the coil end support structure. By positioning the dummy ring symmetrically with respect to the connection ring, the overall structural rigidity is improved without creating the natural frequency issues that would arise from adding more electrical connection rings, since the dummy ring does not participate in electrical conduction.
Solution Approach 2:
The patent intentionally creates a symmetric structural arrangement by adding dummy rings to balance the asymmetry caused by the non-uniform distribution of connection rings and leads. This symmetry in the mechanical support structure uniformizes the rigidity distribution in the circumferential direction, lowering the natural frequency and reducing vibration, while the electrical connection asymmetry is maintained where necessary for functional reasons.
Data Source
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AI summary
A rotating electrical machine of the present invention comprises a rotor; a stator disposed facing the rotor with a predetermined gap, and including a stator core and a stator coil; a high voltage bushing that outputs electricity from the stator coil to the outside; an electric power line including at least a connection ring extending in a circumferential direction, and connecting the high voltage bushing and one side of a coil end which is an axial-direction end of the stator coil to form an electrical path; and a dummy ring including a metal as a main material, and disposed in alignment with the connection ring in the circumferential direction and in a same circumference as the connection ring.