Wind Turbine Stator Cooling Channels for Magnetic Loss Control
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Solution Overview
Problem
Wind turbines with dynamoelectric machines face challenges in efficient cooling due to increased losses and magnetic flux changes, requiring effective cooling methods that maintain magnetic properties and reliability under harsh conditions.
Innovation Solution
The implementation of axially extending cooling channels between the slot wall and main insulation, combined with a can between the stator and rotor, allowing for liquid cooling of the stator and gas cooling of the rotor, which maintains magnetic conditions and enhances cooling performance through double-flow cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling channels are provided in the magnetically conductive body (stator and/or rotor), then cooling efficiency is improved, but magnetic flux changes resulting in further losses
Solution Approach 1:
The cooling system is segmented into two separate circuits: one for the stator (liquid cooling) and one for the rotor (gas cooling). This segmentation allows each part to be cooled independently without interfering with the magnetic properties of the other, resolving the contradiction between cooling efficiency and magnetic losses.
Solution Approach 2:
A can is introduced as an intermediary component between the stator and rotor. This can serves as a barrier that allows thermal management for both components while preventing direct thermal and magnetic interaction, thus maintaining magnetic flux integrity while enabling efficient cooling.
2Temperature
If liquid cooling is used for the stator, then cooling performance is improved, but device complexity increases
Solution Approach 1:
The can structure serves multiple functions simultaneously: it acts as a barrier between stator and rotor, provides a mounting structure for cooling channels, and facilitates both liquid cooling of the stator and gas cooling of the rotor. This multi-functionality reduces overall device complexity despite the advanced cooling system.
3Temperature
If cooling channels are provided between insulation and slot wall, then heat dissipation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The cooling channels are formed in the insulation material before the winding is assembled into the final position. This preliminary formation of cooling channels allows for better manufacturing control and precision, as the channels are created when the insulation is in a more accessible and stable state, rather than attempting to create them after assembly.
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 solution achieves high power density and reliability in wind turbines with a compact design, ensuring efficient heat dissipation and uniform temperature profiles while preserving magnetic properties.
Implementation Method 1
cooling channels are required in the magnetically conductive body of the dynamoelectric machine... cool the metal of the teeth particularly efficiently
Implementation Method 2
stator can be liquid-cooled (oil, water)... to reliably dissipate the heat arising there
Implementation Method 3
a can is provided between the stator and the rotor, with the result that different cooling principles are employed
Data Source
AI summary
A wind turbine includes a dynamoelectric machine including a liquid-cooled stator and a rotor interacting with one another. The stator includes a magnetically conductive body and a winding system which is embedded in slots of the magnetically conductive body and which includes a main insulation arranged between a conductor of the winding system and a slot wall and including at least one recess provided in a cooling-channel impression of the main insulation to form at least one axial cooling channel extending between the main insulation and the slot wall, so that the at least one cooling channel borders the slot wall without insulation in direct contact with the slot wall. The winding system includes end windings which are also liquid-cooled. A can separates the stator and the rotor from one another and enables different cooling media for the stator and the rotor.