Rotor Winding Head Support Layout for Higher Rigidity
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Solution Overview
Problem
Existing rotors for electric machines, particularly in variable-speed hydroelectric power motor-generators, lack sufficient rigidity and are difficult to mount due to complex curvature of winding elements and inadequate support structures.
Innovation Solution
A rotor design featuring winding elements arranged in two layers with distinct regions of axial and angled progression, utilizing a winding head support and retaining elements with tension bolts and support bodies, where winding elements in the angled region are spaced differently to accommodate larger diameter tension bolts, and incorporating stop surfaces and elastic elements to manage stress and prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If support bodies and tension bolts are arranged in multiple rings perpendicular to the rotor axis, then the winding elements can be held in place, but the rigidity of the rotor is insufficient and the structure becomes complex
Solution Approach 1:
The patent transitions from arranging support bodies and tension bolts in multiple rings perpendicular to the rotor axis to arranging them in at least one plane extending axially through the rotor body. This dimensional change from radial rings to axial planes simplifies the structure while improving rigidity by distributing the holding force more effectively along the axial direction where the winding elements progress.
2Adaptability or versatility
If winding elements follow a complicated curved progression with multiple curvature areas, then the winding head can accommodate angled progression, but the mounting becomes difficult
Solution Approach 1:
The patent divides the winding head into distinct regions: a first region where winding elements progress in axial direction and a second region where they progress at an angle. By segmenting the winding head and providing different support structures for each region (with the second region having larger spacing for larger diameter tension bolts), the complex curved progression is managed through modular, region-specific solutions that simplify mounting.
3Strength
If smaller diameter tension bolts are used, then the structure can be simpler, but the rigidity and structural integrity are reduced
Solution Approach 1:
The patent applies local quality by providing different spacing configurations for different regions of the winding head. The second region, where winding elements progress at an angle, has larger spacing between adjacent winding elements to accommodate larger diameter tension bolts. This localized adaptation allows the use of stronger bolts specifically where needed for structural integrity, while other regions can maintain simpler configurations.
Data Source
AI summary
A rotor for an electric machine includes a rotor body, winding elements, and a winding head arranged axially adjacent to the rotor body, and wherein the winding head encompasses two regions, wherein in a first region the winding elements progress in axial direction, and wherein in a second region the winding elements progress at an angle to the axial direction, and wherein each winding element in the second region in which it progresses at an angle to the axial direction is located at a distance of A1 from a first directly adjacent winding element of the same layer and at a distance A2 from a second directly adjacent winding element of the same layer, wherein A2 is greater than A1.