Laminated Stator Cooling Channels With Low Pressure Loss
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Solution Overview
Problem
Existing electric machines face challenges in optimizing cooling efficiency and reducing component complexity and weight, particularly in high-power applications without housings, leading to increased thermal losses and pressure loss in cooling circuits.
Innovation Solution
A stator design featuring a stator body composed of layered sheets with integrated fluid channels and a contacting element with a plastic base body that includes openings to connect with stator openings, allowing cooling fluid to enter and guide through the stator body, reducing the need for additional components and optimizing cooling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If separate cooling channels and components are introduced in the stator laminated core and slots, then cooling capacity is improved, but device complexity and pressure loss increase
Solution Approach 1:
The patent integrates the cooling channel system directly into the stator laminated core structure, merging the cooling function with the structural components. The fluid channels are formed as integral parts of the stator teeth and grooves, eliminating the need for separate cooling components and reducing overall device complexity while maintaining effective cooling capacity.
Solution Approach 2:
The stator laminated core serves multiple functions simultaneously: it provides the structural framework for the electric machine, holds the electrical conductors in the slots, and acts as the cooling channel system. This multi-functionality reduces the number of separate components needed and simplifies the overall device structure.
2Temperature
If separate cooling components are introduced in the stator laminated core, then cooling capacity is improved, but pressure loss in cooling circuit increases
Solution Approach 1:
By merging the cooling channels with the stator core structure, the patent creates a streamlined flow path that reduces turbulence and pressure losses. The integral design eliminates additional connections and joints between separate cooling components, which are typical sources of pressure loss in cooling circuits.
3Weight of stationary object
If electric machines without housings are used to save weight, then weight is reduced, but cooling efficiency deteriorates
Solution Approach 1:
The patent combines the structural support function traditionally provided by a housing with the cooling channel system within the stator laminated core. This integration eliminates the need for a separate housing while maintaining effective cooling, thereby reducing overall weight without compromising cooling efficiency.
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
The design enhances cooling efficiency, reduces thermal losses, and minimizes component complexity and weight by integrating fluid guidance into the stator, thereby improving overall performance and reducing pressure loss in the cooling circuit.
Implementation Method 1
the stator body has a plurality of fluid channels through which a cooling fluid can flow
Implementation Method 2
a plurality of the fluid channels emerge from an end side of the stator body so as to form a respective opening
Implementation Method 3
the contacting element comprises an electrically isolating base body, on and/or in which electrical contacting conductors run
Data Source
AI summary
A stator for an electric machine is disclosed. The state includes a stator body having a plurality of stator teeth arranged distributed circumferentially and stator grooves formed between the stator teeth and extending through the stator body in the axial direction, wherein electrical conductors of a stator winding are arranged in the stator grooves, the electrical conductors emerging from the end of the stator body at least so as to form an end winding and being able to be energized by means of an electrical contact-making element, wherein the stator body is formed from a plurality of layered stator sheets, and the stator body has a plurality of fluid channels through which a cooling fluid can flow and which extend through the stator body in the axial direction.