Electrical Machine Cooling Jacket with Bypass Duct for Pressure Loss
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Solution Overview
Problem
Existing electrical machines face challenges in efficiently managing heat transfer and pressure loss in their cooling systems, particularly as output increases, with prior art designs limiting flexibility in influencing heat transfer behavior and pressure drop.
Innovation Solution
The electrical machine incorporates a hollow-cylindrical cooling jacket with redirecting grooves and a bypass duct that connects adjacent cooling ducts, allowing for a meandering cooling path and optional bypassing of parts of the path to adjust pressure drop and heat transfer parameters, featuring seals with cutouts and grooves for fluid communication between ducts and grooves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a meandering cooling path is formed through the housing to improve cooling effect, then heat transfer efficiency is improved, but pressure drop increases
Solution Approach 1:
The cooling path is segmented into multiple straight cooling ducts connected by redirecting grooves, creating a meandering flow path without excessive length. This segmentation allows the coolant to follow a controlled zigzag pattern that improves heat transfer while limiting pressure drop compared to a continuous meandering path.
Solution Approach 2:
Redirecting grooves act as intermediaries between adjacent cooling ducts, enabling smooth transitions of coolant flow. These grooves facilitate the meandering path by providing dedicated flow channels that redirect coolant between ducts while minimizing flow resistance and pressure loss.
2Temperature
If cooling ducts are arranged to maximize heat transfer, then cooling performance is improved, but device complexity increases
Solution Approach 1:
The cooling ducts and redirecting grooves are merged into an integrated cooling system where adjacent cooling ducts are fluidically connected through the grooves. This merging creates a unified meandering cooling path that achieves effective heat transfer without requiring separate complex components for each cooling zone.
Solution Approach 2:
The housing structure serves multiple functions: it provides mechanical support, contains the cooling system, and incorporates both cooling ducts and redirecting grooves as integral features. This multi-functionality reduces overall device complexity by eliminating the need for separate cooling system components.
3Stress or pressure
If pressure drop is reduced by simplifying the cooling path, then ease of operation is improved, but heat transfer efficiency decreases
Solution Approach 1:
Different sections of the cooling system have optimized local characteristics: cooling ducts are designed for efficient heat transfer with appropriate dimensions and spacing, while redirecting grooves are designed for smooth flow transition with minimal resistance. This local optimization allows the system to achieve both low pressure drop and high heat transfer efficiency simultaneously.
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 enhances heat transfer efficiency and reduces pressure loss between the inlet and outlet, allowing for flexible adjustment of cooling parameters while maintaining a simple and economical production process.
Implementation Method 1
A coolant can flow along the cooling path and can thus cool the housing and in particular the stator of the electrical machine
Implementation Method 2
The cooling jacket has cooling ducts running between its end sides... The cooling jacket serves to accommodate a stator of the electrical machine. The stator of the electrical machine can thus be cooled by the cooling jacket
Data Source
AI summary
The present invention relates to an electrical machine (1) having a housing (2), wherein the housing (2) has a hollow-cylindrical cooling jacket (2a) for accommodating a stator (3) and, attached to the end sides of the cooling jacket (2a), housing closures (2b), in particular mounting plates, and wherein the cooling jacket (2a) has cooling ducts (4a) running between its end sides (17) and the housing closures (2b) have redirection grooves (4b) so that two adjacent cooling ducts (4a) are fluidically connected by a redirecting groove (4b), whereby the cooling ducts (4a) and the redirecting grooves (4b) form a meandering cooling path (10) which extends through the housing (2) between an inlet (5) and an outlet (6) and through which a coolant can flow, wherein the housing (2) has a bypass duct (7) which fluidically connects the inlet (5) and the outlet (6) while bypassing the meandering cooling path (10), or which fluidically connects two part regions of the meandering cooling path (10) while bypassing one part of the meandering cooling path (10).