Stator Cooling Nozzle Layout for Uniform Winding Temperatures

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Solution Overview

Problem

Conventional stators in electromechanical transducers experience nonuniform heat dissipation, leading to inhomogeneous temperature distribution and premature material degradation due to uneven cooling medium flow, which results in thermal imbalance and inefficient waste heat emission.

Innovation Solution

The stator incorporates a cooling system with nozzles that direct an accelerated coolant jet at winding overhangs and utilizes a core with axially spaced bodies to create parallel coolant flow paths, ensuring targeted cooling and uniform temperature distribution by guiding the coolant through axial gaps and around winding sections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If conventional cooling channels are used in the core, then cooling is provided, but nonuniform temperature distribution and thermal imbalance occur due to uneven cooling medium flow

Engineering Contradiction:

Improvetemperature distribution uniformityVSAvoidcooling system structure

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The core is divided into multiple magnetically permeable bodies arranged axially next to one another with gaps between them. This segmentation creates multiple parallel flow paths for the cooling medium, distributing the flow more uniformly and eliminating thermal imbalance in the stator.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Nozzles are strategically positioned to direct accelerated cooling medium jets at specific locations such as winding overhangs that generate increased temperatures. This localized targeted cooling addresses hot spots while maintaining overall temperature uniformity.

Inventive Principle:

Principle #3Local quality

2Productivity

If cooling medium flow is increased to improve heat dissipation, then heat dissipation efficiency improves, but nonuniform flow distribution and dead water zones worsen

Engineering Contradiction:

Improveheat dissipation efficiencyVSAvoidcooling uniformity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The cooling system is segmented into multiple parallel flow paths through the gaps between magnetically permeable bodies. This segmentation distributes the cooling medium flow more evenly, preventing dead water zones while maintaining high heat dissipation efficiency.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Nozzles are used to accelerate the cooling medium into targeted regions, optimizing fluid dynamics to ensure uniform flow distribution and effective heat removal without creating flow imbalances.

Inventive Principle:

Principle #29Pneumatics and hydraulics

3Reliability

If conventional cooling channels are used, then cooling is provided, but material properties are depleted earlier in some regions due to higher thermal loading

Engineering Contradiction:

Improvematerial lifespanVSAvoidthermal loading distribution

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

Dividing the core into multiple axially arranged magnetically permeable bodies creates uniform cooling distribution across all regions. This prevents localized overheating and ensures all materials are subjected to comparable, reduced thermal loading, extending overall material lifespan.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Targeted nozzle positioning directs enhanced cooling to regions with higher thermal loading, balancing the thermal conditions across different stator regions and preventing premature material degradation in specific areas.

Inventive Principle:

Principle #3Local quality

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 heat dissipation efficiency, maintains balanced temperatures, and prolongs material lifespan by ensuring uniform cooling and targeted heat management across the stator.

Implementation Method 1

the cooling system has at least one nozzle through which the cooling medium flows during operation, such that the cooling medium flows out as an accelerated jet downstream of the nozzle

Methodology Applied

Scientific EffectFluid flow:

Implementation Method 2

the cooling medium is combined in the axial gap from various flow paths guided in a parallel fashion

Methodology Applied

Scientific EffectHeat transfer:

Implementation Method 3

the core has at least two bodies arranged axially next to one another, a first body and a second body, wherein the first body is arranged in a manner spaced apart from the second body by an axial gap, and wherein the cooling medium is combined in the axial gap from various flow paths guided in a parallel fashion

Methodology Applied

Scientific EffectFluid flow:

Data Source

PatentUS20240055952A1Stator, method for simulation, computer program product

Publication Date: 2024.02.15 FLENDER GMBH

AI summary

A stator of an electromechanical transducer includes a winding system and a cooling system designed for through-flow of a cooling medium and including a nozzle through which the cooling medium flows during operation, such that the cooling medium flows out as an accelerated jet downstream of the nozzle. The nozzle is oriented such that part of the winding system is struck by the accelerated jet from the nozzle. A core includes cutouts for at least partial arrangement of winding sections of the winding system. The core includes a magnetically permeable body designed to include at least a first body and a second body which are arranged axially next to one another, with the first body being arranged in spaced-apart relationship from the second body to define an axial gap there between, with the cooling medium being combined in the axial gap from various flow paths guided in a parallel fashion.