Stator Winding Coil Group Layout to Suppress Resonance Voltage
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Solution Overview
Problem
Rotating electric machines with stator windings experience resonance phenomena due to high-frequency components when square-wave voltage is applied, leading to increased voltage differences and reduced insulation performance, which complicates the design in achieving both high output and compact size.
Innovation Solution
The rotating electric machine incorporates a stator winding configuration with series-connection coil groups, where unit coils are wound in a circumferential direction and connected in parallel, with specific end connections to suppress resonance and enhance insulation performance by magnetic coupling between coils within the same magnetic pole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a square-wave voltage is applied to the stator winding, then the voltage is amplified due to resonance phenomenon, but the insulation performance is reduced
Solution Approach 1:
The patent divides the stator winding into multiple independent coil groups, each with its own resonance characteristics. By segmenting the winding structure into several parallel-connected coil groups rather than using a single continuous winding, the resonance phenomenon is distributed and controlled across multiple segments, preventing excessive voltage amplification that would compromise insulation performance.
2Power
If the stator winding is designed for high output, then the power increases, but the device size increases
Solution Approach 1:
The patent combines multiple coil groups in parallel connection to achieve high output power within a compact stator structure. By merging the magnetic fields and electrical outputs of multiple parallel coil groups, the system achieves high power density without proportionally increasing the overall stator volume, thus resolving the contradiction between power output and device size.
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 reduces voltage differences between coils, improves insulation performance, and allows for higher output while maintaining a compact and efficient stator winding design.
Implementation Method 1
When a square-wave voltage is applied, a resonance phenomenon occurs in the stator winding as a result of high-frequency components
Implementation Method 2
enhance insulation performance by magnetic coupling between coils within the same magnetic pole
Data Source
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.