Two-Chamber Rotor Shaft Cooling for Speed-Independent Flow Split
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Solution Overview
Problem
Existing cooling systems for electric machines fail to adjust the cooling fluid quantity independently of rotational speed, leading to inefficiencies.
Innovation Solution
A rotor shaft with a tubular hollow shaft and an inflow region divided by a dividing wall into two chambers, allowing cooling fluid to be split into parallel flows, with one chamber having a bottom wall for radial discharge and the other open for axial discharge, ensuring consistent cooling regardless of rotational speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If cooling fluid is introduced axially into the hollow shaft, then cooling fluid can be supplied to the rotor shaft, but the cooling fluid quantity cannot be adjusted independently of rotational speed
Solution Approach 1:
The hollow shaft is segmented into multiple chambers (first chamber with bottom wall, second chamber without bottom wall) separated by dividing walls. This segmentation allows the cooling fluid to be distributed into separate flow paths, enabling independent control of cooling fluid quantity to each chamber regardless of rotational speed variations.
Solution Approach 2:
Different chambers are given different structural qualities - the first chamber has a bottom wall for radial discharge while the second chamber is open for axial discharge. This local differentiation allows each chamber to handle cooling fluid differently, enabling independent quantity adjustment tailored to specific cooling requirements.
2Temperature
If cooling fluid flows through the hollow shaft with axial component, then cooling can be achieved, but the cooling performance varies with rotational speed
Solution Approach 1:
The system dynamically adapts cooling fluid distribution by utilizing both radial and axial flow components through different chambers. The radial discharge from the first chamber and axial discharge from the second chamber work together to maintain consistent cooling performance across varying rotational speeds by compensating for speed-dependent flow variations.
3Device complexity
If single-chamber hollow shaft is used, then structure is simple, but cooling fluid distribution to opposite ends is uneven
Solution Approach 1:
The hollow shaft is divided into multiple chambers with dividing walls to create separate flow paths. This segmentation ensures that cooling fluid is distributed evenly to opposite ends of the rotor shaft through controlled radial and axial discharge, achieving uniform cooling without significantly increasing overall 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
Enables efficient cooling of both the rotor and stator by distributing cooling fluid evenly to opposite ends, independent of rotational speed, enhancing cooling performance and efficiency.
Implementation Method 1
a cooling fluid, for example an oil, to flow through said hollow shaft
Implementation Method 2
leaves the hollow shaft via outlet openings, for example bores on the first side and on a second side which lies axially opposite the first side, in order to deposit it onto stator winding heads of the stator, for example for cooling purposes
Data Source
AI summary
A rotor shaft includes a hollow shaft for conducting a cooling fluid in a cavity enclosed by a shaft outer wall, wherein the outer wall has a first radial outlet opening in a first end portion and a second radial outlet opening in an axially opposite second end portion for letting fluid out into a surrounding environment. An inflow region is arranged in the region of the first end portion and is subdivided into at least two chambers by an axially extending partition wall for splitting the fluid into two parallel cooling fluid flows. A first chamber is fluidically coupled to the first outlet opening, and a second chamber is designed without a bottom to pass the second cooling fluid flow into the cavity and is fluidically coupled to the second outlet opening to allow the second cooling fluid flow out radially at the second side.