Rotating Electrical Machine Cooling Layout for Compact Airflow
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Solution Overview
Problem
Existing cooling structures for rotating electrical machines, which involve installing cooling fans at a predetermined angle to prevent mutual interference, result in increased external dimensions, making miniaturization difficult and limiting cooling efficiency.
Innovation Solution
The design incorporates a fan cover with cooling fans installed on the same plane, featuring convex and concave exhaust opening parts on end brackets to reduce ventilation resistance and facilitate efficient airflow without increasing the machine's external dimensions, along with the use of a partition plate to direct cooling air and prevent mutual interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cooling fans are installed at a predetermined angle to prevent mutual interference of cooling air, then cooling efficiency is improved, but external dimensions of the rotating electrical machine become larger
Solution Approach 1:
The patent transitions from arranging cooling fans in parallel at angles (2D plane arrangement) to stacking them in the axial direction (3D spatial arrangement). This dimensional change allows multiple fans to be positioned without increasing radial dimensions, while the convex-concave exhaust opening structure optimizes airflow in the axial direction to prevent mutual interference.
Solution Approach 2:
The cooling fans are nested within the fan cover structure, with multiple fans arranged in the axial direction within the available space. The convex portion of the fan cover and concave exhaust opening parts create a nested airflow path that guides cooling air efficiently without requiring additional external space.
2Productivity
If multiple cooling fans are arranged in parallel to improve cooling efficiency, then heat dissipation is enhanced, but the structure becomes more complex and occupies more space
Solution Approach 1:
Multiple cooling fans are combined within a single fan cover structure, sharing common mounting and airflow management. The convex-concave exhaust opening configuration unifies the airflow path for all fans, reducing overall structural complexity compared to separate cooling systems for each fan.
3Power
If the size of rotating electrical machine is increased to achieve high output and torque, then performance is improved, but installation space requirements and cost increase
Solution Approach 1:
The enhanced cooling system creates an optimized thermal environment that allows the machine to operate at higher power densities without excessive temperature rise. By efficiently removing heat, the system can sustain higher outputs and torques within the same physical dimensions, effectively creating a high-performance thermal management environment.
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 enhances cooling efficiency by rapidly dissipating heat from the housing surface, reducing temperature rise, and maintaining compact dimensions, suitable for applications requiring high output and torque like machine tool equipment.
Implementation Method 1
Cooling air discharged from the cooling fan passes through the space created between the housing of the rotating electrical machine and the fan cover, quickly exhaust heat from the surface of the housing
Implementation Method 2
The heat generated inside the rotating electrical machine is dissipated from the housing surface by heat conduction
Data Source
AI summary
Rotating electrical machine comprising: a housing storing a stator and a rotor, a fan cover covers the housing from the outside, an end bracket attached to the axial end face of the housing, a cooling fan installed in the fan cover, wherein output shaft side end face of the fan cover has a convex portion extending in the axial direction, the end bracket on the output shaft side has a concave first exhaust opening part relative to the convex part of the fan cover, the end bracket on the anti-output shaft side has a second exhaust opening part on the opposite side of the first exhaust opening part.