Stator Coil-End Support Structure for Vibration and Cooling
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Solution Overview
Problem
Conventional rotating electric machines experience vibration and temperature increase at coil ends due to electromagnetic forces and Joule heat, with adhesion adjustment members and insulation members hindering cooling.
Innovation Solution
A stator design with support members inserted between adjacent stator coils, featuring larger contact surfaces in the coil end distal portion, and strategically positioned to increase the natural frequency beyond the excitation frequency, allowing for improved cooling airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesion adjustment members and insulation members are provided between stator coils at coil ends, then vibration suppression is improved, but cooling performance deteriorates
Solution Approach 1:
The support members are designed with non-uniform contact surface areas along the axial direction of the coil end. The contact surface area in the distal portion (away from stator core) is made larger than in the base portion (close to stator core). This local differentiation allows vibration suppression where needed while preserving cooling pathways in the base portion where temperature is highest.
2Reliability
If support members with large contact surface area are provided throughout the coil end, then vibration suppression is improved, but cooling airflow is hindered
Solution Approach 1:
The support members are designed with non-uniform contact surface areas along the axial direction of the coil end. The contact surface area in the distal portion (away from stator core) is made larger than in the base portion (close to stator core). This local differentiation allows vibration suppression where needed while preserving cooling pathways in the base portion where temperature is highest.
3Reliability
If support members are provided with larger contact surfaces in the coil end distal portion, then vibration suppression is improved, but manufacturing complexity increases
Solution Approach 1:
The support members are designed with varying contact surface area parameters along the axial direction. By changing the geometric parameter (contact surface area) of the support members, the patent achieves both vibration suppression and improved cooling without requiring complex multi-component assemblies.
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
Suppresses vibration and temperature rise at coil ends by enhancing cooling airflow, particularly in the coil end base portion, resulting in uniform temperature distribution.
Implementation Method 1
an electromagnetic force having a frequency that is two times the operation frequency acts on the stator, thus causing vibration
Implementation Method 2
the natural frequency is adjusted to be smaller than the excitation frequency based on an electromagnetic force, thus preventing resonance based on the electromagnetic force
Implementation Method 3
the temperature increases due to Joule heat based on the electromotive force, an interlinking magnetic flux, and the like
Implementation Method 4
increase the volume of cooling air flowing to the coil end base portion where the coil temperature is high
Data Source
AI summary
A stator includes: a stator core; stator coils wound at the stator core; and a plurality of support members inserted between the stator coils adjacent to each other so as to retain the stator coils, at a coil end where the stator coils protrude, such that a total contact surface area of the support members with the stator coils is larger in a coil end distal portion away from the stator core than in a coil end base portion close to the stator core. A rotating electric machine includes: a rotor; and the above stator provided around the rotor.