Stator Support Using Symmetrical Material Necks
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Solution Overview
Problem
Electrical machines experience significant stator deformations and subsequent frame and bearing vibrations due to the rotating force field, which are challenging to mitigate without increasing manufacturing costs, weight, or space requirements, especially in large two-pole asynchronous machines.
Innovation Solution
The stator is supported using narrow necks of material at its ends, positioned symmetrically around both vertical and horizontal axes, to isolate it from the frame and reduce deformation wave transmission, allowing for flexible attachment while managing quasi-static and dynamic loads effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the stator back is made thicker or external reinforcements are used to stiffen the stator, then stator deformation is reduced, but manufacturing complexity, cost, weight and space requirements increase
Solution Approach 1:
The stator support structure is segmented into multiple discrete support points (feet) distributed around the circumference, rather than using a continuous thick back or external reinforcements. This segmentation allows the stator to be supported at critical locations while maintaining manufacturing simplicity and reducing overall material usage.
2Object-generated harmful factors
If the stator is isolated from the frame using flexible suspension, then transmission of stator deformations to the frame is reduced, but the ability to bear quasi-static and dynamic loads is compromised
Solution Approach 1:
The support structure exhibits local quality differentiation: the support feet have localized flexibility at the contact points to isolate vibrations, while the overall structure maintains sufficient rigidity through strategic positioning and geometry to bear quasi-static and dynamic loads. This localized approach allows simultaneous achievement of vibration isolation and load bearing capacity.
3Object-generated harmful factors
If the stator is supported at multiple points around the circumference, then frame and bearing vibrations are reduced, but the structural rigidity may be compromised
Solution Approach 1:
The support feet are merged with the stator back structure as an integrated design, where the feet extend from the stator back to provide support points. This merging ensures that the support structure maintains the structural integrity and rigidity of the stator while providing multiple contact points to reduce frame and bearing vibrations.
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 solution substantially reduces frame and bearing vibrations, particularly improving second-order vibrations in large two-pole machines, while maintaining structural rigidity and not obstructing cooling air flow, and can be applied to various pole configurations.
Implementation Method 1
The support isolates the stator from the frame by utilising the natural properties of the frame structure. Furthermore, the support eliminates the transmission of the rotating stator deformation wave into horizontal vibration of the frame.
Data Source
AI summary
The invention comprises an electrical machine with a stator (10) formed of plates, said stator (10) having an outer surface (11) and a first and second end (12) in the axial direction (2) and said stator being supported on the frame (1) of the electrical machine. The stator (10) is supported by necks of material (40a-d) on the outer surface (11) at both ends of the stator. The number of necks (40a-d) at both ends of the stator is even. The stator (10) has a vertical symmetry axis (7) perpendicular to the axial direction (2) and a horizontal symmetry axis (8) perpendicular to the axial direction (2), and the necks (21a-f, 31a-d, 40a-d) are located symmetrically in relation to at least one of the symmetry axes (7, 8).