Rotating Machine Winding Structure for Vibration Suppression
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Solution Overview
Problem
Conventional winding structures of rotating electric machines suffer from imbalance in electromotive force due to eccentric placement of the rotor and stator, leading to increased vibrations and noise, and longer coil-to-coil wires that hinder downsizing and electrical insulation.
Innovation Solution
The winding structure involves winding a part of the coil-to-coil wire around the teeth to shorten the coil length and integrate it with the second coil, maintaining electromagnetic balance while reducing the size of the winding structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If parallel circuits are formed for each coil to reduce vibrations and noise, then electromagnetic balance is improved, but the coil-to-coil wire becomes longer and the coil end increases in size
Solution Approach 1:
The patent merges the coil-to-coil wire with the coil structure by having the wire pass through slots and be wound around teeth to form additional coil portions. This integration eliminates the need for separate long connection wires between coils, as the connection path becomes part of the functional coil structure itself, thereby reducing coil end size while maintaining the parallel circuit configuration for vibration and noise suppression
2Volume of moving object
If the coil-to-coil wire is shortened to reduce coil end size, then the winding structure is downsized, but the electromagnetic balance may deteriorate
Solution Approach 1:
The coil-to-coil wire serves multiple functions: it connects adjacent coils electrically to form parallel circuits for electromagnetic balance, and simultaneously acts as additional coil windings that contribute to the electromagnetic field generation. This multi-functionality allows the wire to be both short (reducing size) and effective (maintaining electromagnetic balance), as its dual role eliminates the need for separate connection and functional components
3Ease of manufacture
If conventional winding structures are used with eccentric rotor and stator placement, then manufacturing is simplified, but cyclic current is generated causing increased vibrations and noise
Solution Approach 1:
The patent employs asymmetric winding configurations where coils are strategically arranged and connected in parallel circuits with specific phase relationships. This asymmetric design compensates for the eccentric placement of rotor and stator by creating balanced electromagnetic forces through the parallel circuit configuration, thereby preventing cyclic current generation while maintaining ease of manufacture through standardized winding patterns
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 approach effectively suppresses vibrations and noise, improves electrical insulation, and enhances productivity by downsizing the rotating electric machine while maintaining electromagnetic balance.
Implementation Method 1
a part of the wire connecting a plurality of coils included in the first coil group is wound around the teeth to form a part of a coil... the part of the wire can contribute, together with the second coil, to the electromotive force
Data Source
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AI summary
A stator winding has series coils (A, B) and the series coils (A, B) are connected in parallel. One of the series coil (A) includes series-connected U phase coils (111U, 112U, 115U, 116U1) and the other series coil (B) includes series-connected U phase coils (113U1, 114U, 117U, 118U). A part of a wire connecting U phase coils (112U, 115U) of that one series coil (A) is wound around the same teeth as those around which one (113U1) of the U phase coils of the other series coil (B) is wound, so as to form a U phase coil (113U2). A part of a wire connecting U phase coils (114U, 117U) of the other series coil (B) is wound around the same teeth as those around which one (116U1) of the phase coils of that one series coil (A) is wound, so as to form a U phase coil (116U2).