Self-Supporting Dynamo-Electric Machine Housing Design
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Solution Overview
Problem
Dynamoelectric machines without a housing lack rigidity and are complex and expensive to produce, while those with a housing have reduced cooling efficiency and increased size, making them less efficient and more costly to manufacture, especially for low-voltage applications.
Innovation Solution
A self-supporting housing with a laminated core section and connection sections that provide structural support and cooling efficiency, allowing for easy implementation of various cooling options and noise insulation, reducing production complexity and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a housing is added to provide structural support, then rigidity is improved, but cooling efficiency deteriorates and size increases
Solution Approach 1:
The housing is segmented into a laminated core section that provides structural support and connection sections that accommodate cooling components. This segmentation allows different parts of the housing to serve different functions - the laminated core section maintains rigidity while the connection sections enable efficient cooling without compromising the overall structural integrity.
Solution Approach 2:
The laminated core section serves multiple functions: it provides structural rigidity, supports the stator laminated core, and facilitates cooling through its design features. This multi-functionality resolves the contradiction by integrating support and cooling functions into a single component rather than requiring separate housing and cooling systems.
2Stability of the object's composition
If a housing is added to provide structural support, then rigidity is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The housing structure is merged with the cooling system by integrating the laminated core section that serves both structural and cooling functions. Connection sections are merged into the same housing structure, eliminating the need for separate support structures and cooling housings, thereby reducing manufacturing complexity while maintaining rigidity.
Solution Approach 2:
The housing is designed as a multi-functional component that simultaneously provides structural support, mounting surfaces for bearings and terminal boxes, and integrated cooling pathways. This universality reduces the number of separate components needed, simplifying manufacturing while achieving the required rigidity.
3Temperature
If cooling passages are enlarged at the outer perimeter, then cooling capacity is improved, but heat flow from laminations to outer casing is blocked
Solution Approach 1:
Cooling passages are strategically positioned and sized differently in different regions of the laminated core section. The local geometry of cooling passages is optimized based on the thermal requirements of each region, allowing adequate cooling capacity while maintaining thermal pathways from the laminations to the outer casing in critical heat-generating areas.
Solution Approach 2:
The cooling system utilizes axial cooling passages that extend through the laminated core section in the axial direction, providing an additional thermal pathway dimension. This axial dimension complements the radial heat flow path, enabling effective cooling without blocking the radial heat flow from laminations to the outer casing.
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 self-supporting housing design enhances cooling efficiency, reduces noise emissions, and simplifies production, enabling the creation of high-performance machines with optimized material use and reduced complexity, particularly suitable for low-voltage applications.
Implementation Method 1
The laminated core section serves to fix the laminated core of a stator via the defined contact areas between the laminated core section of the housing and the laminated core
Implementation Method 2
A plurality of cooling air passages extend axially through the stacked laminations, generally parallel to the central bore
Data Source
Figure 1~4
Figure 5~6
Figure 7~9
AI summary
The invention relates to a dynamo-electric machine (23) comprising a self-supporting housing (1) that has a laminated core section (2) and at least one connecting section (3) in the axial extension of the laminated core section (2). The laminated core section (2) accommodates and secures, and at least sectionally surrounds all sides of, a laminated core (5) of a stator (22). The individual sheets of the laminated core have a basic outer shape with an especially octagonal cross-section, a stator bore (9) surrounded by radially arranged grooves (10) which are evenly distributed along the circumference of the stator bore (9), a yoke back that radially adjoins the grooves and extends equidistantly from the stator bore (9), and axial cavities (34) in the sheet, in regions between the yoke back and the basic outer shape of the sheets.