Stator Jacket Plate Weld Seam Thermal Stress Centering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrical machine stators are complex in construction and have poor heat dissipation due to the placement of jacket plates and weld seams, which complicates cooling and can lead to inefficiencies in thermal management.
Innovation Solution
An intermediate element is placed in the area of the weld seam between the jacket plate and the stator core, allowing the weld seam to be pressed against the intermediate element, maximizing the contact area between the jacket plate and the stator core, and facilitating a positive fit to enhance torque transmission and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the jacket plate is used to center the laminated stator core with press rings and welding, then the centering function is achieved, but the construction becomes complex
Solution Approach 1:
The patent removes the press rings and their centering grooves from the structure, extracting the complicating elements while retaining the essential centering function through the simplified jacket plate configuration
Solution Approach 2:
The jacket plate is designed to perform multiple functions: it centers the stator core, provides structural support, and enables cooling, eliminating the need for separate press rings and reducing overall construction complexity
2Reliability
If a casing is arranged between the casing plate and laminated core with a recess for the weld seam, then the weld seam is positioned away from the casing, but heat dissipation becomes complicated
Solution Approach 1:
The patent eliminates the intermediate casing and its recess structure, removing the thermal barrier that impeded heat dissipation while maintaining reliable weld seam positioning through direct contact between the jacket plate and stator core
Solution Approach 2:
The design transitions from a multi-layer radial structure (casing plate-casing-jacket plate-stator core) to a more direct configuration, improving thermal conduction pathways from the stator core through the jacket plate to the cooling medium
3Reliability
If the abutting edges of the jacket plate are welded together, then a liquid-tight seal is formed, but the contact area between jacket plate and stator core is reduced
Solution Approach 1:
The intermediate element acts as a mediator that enables the weld seam to be positioned optimally for creating a liquid-tight seal while simultaneously maintaining maximum contact area between the jacket plate and stator core, resolving the spatial conflict between sealing and thermal contact requirements
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 simplifies the construction of the electrical machine, improves heat dissipation by maximizing the contact surface area, and allows for efficient cooling while maintaining a liquid-tight seal, thereby enhancing the overall performance of the machine.
Implementation Method 1
the weld seam exerts a tensile stress on the shell sheet due to its thermal shrinkage
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A stator (1) of an electric machine has a stator laminate stack (6), which extends, when viewed in the direction of an axis of symmetry (5) of the stator laminate stack (6), from a first to a second axial end side (8, 9) of the stator laminate stack (6). The stator laminate stack (6) is surrounded on its outer side (10) by a jacket plate (11), which extends, when viewed around the axis of symmetry (5), from a first to a second abutment edge (12, 13) of the jacket plate (11). The abutment edges (12, 13) extend, when viewed in the direction of the axis of symmetry (5), at least from the first to the second axial end side (8, 9). They are welded to one another, when viewed in the direction of the axis of symmetry (5), by means of a continuous weld seam (14) over the entire length (1) of said abutment edges. The weld seam (14), owing to its thermal shrinkage, exerts a tensile stress on the jacket plate (11). When viewed around the axis of symmetry (5), an intermediate element (15) is arranged in the region of the weld seam (14) and only there between the jacket plate (11) and the stator laminate stack (6). In the remaining region, the jacket plate (11) rests directly on the stator laminate stack (6). Owing to the tensile stress, in the region of the intermediate element (15) the weld seam (14) is pressed in the direction towards the axis of symmetry (5) against the intermediate element (15) and, in the remaining region, the jacket plate (11) is pressed in the direction towards the axis of symmetry (5) against the stator laminate stack (6).