Stator Neutral Line Fixing for Vibration Resonance
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Solution Overview
Problem
In rotary electric machines, the neutral line tends to resonate at a frequency lower than the natural frequency of the stator core and phase windings, leading to unstable operation, especially when mounted in vehicles, as it can resonate with engine vibrations, causing the connecting point between the neutral line and phase windings to separate.
Innovation Solution
A stator design where the neutral line is fixed to adjacent phase windings using a high viscosity adhesive, tablet adhesive, or a sheet member that melts and cures, increasing the resonant frequency of the connecting structure and preventing resonance with external vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the neutral line is connected in a floating state between pulled out lead ends, then assembly is easier and manufacturing is simpler, but the resonant frequency becomes lower than the natural frequency of the stator core and phase windings, causing resonance with external vibrations and unstable operation
Solution Approach 1:
The patent merges the neutral line with the phase windings by fixing the neutral line to the coil ends of the phase windings. This integration increases the resonant frequency of the neutral line connecting structure to be higher than the natural frequency of the stator core and phase windings assembly, thereby preventing resonance with external vibrations while maintaining manufacturing simplicity
Solution Approach 2:
The patent changes the resonant frequency parameter of the neutral line by fixing it to the phase windings. This parameter change ensures that the resonant frequency of the neutral line connecting structure exceeds the natural frequency of the stator core and phase windings assembly, eliminating the harmful resonance effect
2Reliability
If the neutral line is fixed rigidly to increase resonant frequency, then operational stability improves, but the complexity of the structure and manufacturing process increases
Solution Approach 1:
The patent applies partial fixing action by fixing the neutral line only to the coil ends of the phase windings, rather than throughout its entire length. This partial action is sufficient to increase the resonant frequency above the natural frequency of the stator core and phase windings assembly, ensuring operational stability without requiring complete rigid fixation and thus avoiding excessive structural complexity
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 ensures stable fixation of the neutral line to the phase windings, preventing resonance and ensuring reliable operation by increasing the resonant frequency of the connecting structure, thus avoiding instability caused by engine vibrations.
Implementation Method 1
the neutral line is fixed to adjacent phase windings using a high viscosity adhesive, tablet adhesive, or a sheet member that melts and cures
Data Source
AI summary
A stator includes a stator core, a plurality of phase windings, a neutral line and a fixing portion. The plurality of phase windings is wounded a plurality of times by a predetermined winding method crossing between a plurality of slots. One lead end of each phase winding is a neutral point connecting portion, and the one lead end is pulled out from an axially end portion of the stator core. The neutral line connects the neutral point connecting portions of the phase windings of different phases together. The neutral line is separate from the phase windings. The fixing portion fixes a first phase winding that is connected to the neutral line. A second phase winding is adjacent to the first phase winding together.