Ventilated Rotor Axial Radial Channels Cooling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-power turbogenerators face a limitation in increasing power without exceeding temperature regulations, as larger dimensions lead to increased conductor bar temperatures and reduced specific power delivery, necessitating improved ventilation methods for the rotor electrical winding.
Innovation Solution
The ventilated rotor design features axial channels divided into multiple portions to enhance ventilation efficiency, with radial channels connecting subslots directly to the outer surface, concentrating ventilation in critical overheating areas, allowing for more efficient cooling of the electrical winding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the dimensions of the rotor are increased to increase the power of the turbogenerator, then the power output increases, but the temperature of the conductor bars increases and specific power delivery decreases
Solution Approach 1:
The axial channels are divided into multiple axial portions, with each portion traveled over by a respective ventilating gas flow. This segmentation allows for distributed cooling along the length of the rotor, effectively managing heat in larger dimensions without increasing overall temperature
Solution Approach 2:
Radial channels are arranged between consecutive adjacent axial portions to provide concentrated ventilation in particularly critical areas. This local enhancement of cooling capacity addresses hot spots in specific regions while maintaining overall thermal balance
2Length of moving object
If the length of axial channels is increased to accommodate larger rotor dimensions, then the rotor can handle higher power, but the temperature of conductor bars increases and ventilation efficiency decreases
Solution Approach 1:
By dividing the axial channels into multiple axial portions, the patent creates shorter effective cooling paths. Each portion is traveled over by a respective gas flow, ensuring that no single channel becomes excessively long and thermally inefficient
Solution Approach 2:
The introduction of radial channels between axial portions creates a three-dimensional ventilation network. This allows cooling gas to access conductor bars from multiple directions (axial and radial), effectively cooling larger rotor volumes without proportionally increasing channel length
3Temperature
If the rotor current is reduced to decrease losses per unit length, then temperature regulations are met, but the specific power delivery decreases
Solution Approach 1:
The patent employs a sophisticated gas ventilation system with multiple axial and radial channels to enhance convective cooling. This pneumatic approach removes heat more effectively, allowing higher currents to be carried without exceeding temperature limits, thereby maintaining specific power delivery
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 effectively reduces the mean and maximum temperature of the electrical winding, enabling compliance with temperature regulations for larger rotors while maintaining current rotor current intensity, thus improving power delivery and utilization.
Implementation Method 1
a plurality of axial channels suitable for ventilating the conductor bars; a plurality of subslots, for the ventilating gas to be distributed by the subslots to the axial channels and expelled from the latter at the level of the outer surface of the rotor
Data Source
AI summary
A ventilated rotor of a high-power turbogenerator for the production of electricity has a shaft extending along an axis; a plurality of axial slots obtained in the shaft; a plurality of conductor bars arranged at least partly in the slots; a plurality of axial channels suitable for ventilating the conductor bars; a plurality of subslots, each of which is arranged below a slot to distribute a ventilating gas; a plurality of axial portions traveled over by respective flows of ventilating gas along each axial channel; and at least one radial channel, which is intended to convey directly the ventilating gas from the subslot to the outer surface of the rotor via the conductor bars and is arranged between two consecutive and adjacent axial portions of an axial channel.