Stator Winding Layout to Suppress Resonance in Rotating Machines
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing rotating electric machines face issues with insulation performance due to resonance phenomena and voltage amplification, leading to potential short-circuiting and decreased space factor in windings, especially in wave and lap winding structures.
Innovation Solution
The rotating electric machine employs a stator winding configuration with series-connection coil groups, where unit coils are arranged in slots of the same phase within the same magnetic pole to enhance magnetic coupling, thereby suppressing resonance and improving insulation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulating film is made thicker to improve insulation performance between phases, then insulation performance is improved, but interphase distance increases leading to decreased space factor and increased size
Solution Approach 1:
The patent changes the winding configuration parameter from conventional wave/lap winding to a specific connection pattern where unit coils are connected in series within coil groups, and coil groups are connected in parallel. This parameter change in the electrical connection structure suppresses resonance and allows for reduced interphase distance while maintaining insulation performance
Solution Approach 2:
The patent converts the harmful resonance phenomenon into a beneficial effect by strategically arranging unit coils in slots of the same phase within the same magnetic pole. This arrangement creates magnetic coupling that suppresses resonance currents, transforming the potential harmful resonance into a stabilizing effect that improves insulation performance
2Stability of the object's composition
If unit coils are connected in series in lap winding structure, then winding continuity is improved, but resonance currents in opposite directions may flow causing surge voltage and decreased insulation performance
Solution Approach 1:
The patent segments the phase winding into multiple unit coils that are arranged in series within coil groups. Each unit coil is placed in specific slots, and the segmentation allows for controlled magnetic coupling between adjacent unit coils, suppressing resonance while maintaining overall winding continuity
Solution Approach 2:
The patent introduces coil groups as intermediary structures between unit coils and phase terminals. These coil groups provide a structured connection pattern that mediates the electrical connection, ensuring continuity while enabling resonance suppression through specific slot arrangements
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 configuration effectively suppresses resonance and reduces voltage differences between unit coils, enhancing insulation performance and output efficiency.
Implementation Method 1
unit coils that are housed in slots of the same phase within the same magnetic pole... enhance magnetic coupling, thereby suppressing resonance
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A rotating electric machine includes a stator and a rotor. The stator includes a stator core that has a plurality of slots that are arranged in a circumferential direction and a stator winding that has a plurality of phase coils that are wound in the slots. The rotor is arranged so as to oppose the stator in a radial direction and has a plurality of magnetic poles in the circumferential direction. In the rotating electric machine, each of the phase coils has a plurality of series-connection coil groups that each includes n unit coils that are arranged to be wound in the circumferential direction. In each of the series-connection coil groups, a first end thereof is connected to a phase terminal for a respective phase and a second end is connected to a neutral point, and the series-connection coil groups are connected in parallel.