Finite Element Analysis of Rotor Strength in High-Speed Permanent Magnet Generators
Bibliographic record
Abstract
This study systematically analyzes the stress distribution of the rotor in high-speed permanent magnet generators under different conditions, including rotor structure, types of inter-pole filler materials, sleeve thickness, interference fit, temperature, and rotational speed, using finite element analysis (FEA). The results indicate that circumferential segmentation can significantly reduce the tangential and radial stresses of the permanent magnets, with the best performance observed in the rotor structure with four segments. However, increasing the number of segments (e.g., to 20 segments) does not significantly improve the stress distribution in the sleeve and core, and in some cases, it may even exacerbate stress concentration. Regarding the choice of inter-pole filler materials, high-temperature-resistant plastic (PPS) performs best in reducing the stress on both the permanent magnets and the sleeve. Compared to carbon fiber and aluminum alloy materials, PPS more effectively reduces the stress on the permanent magnets and sleeve, especially under high-temperature and high-speed conditions, showing superior mechanical performance. Increasing the sleeve thickness effectively reduces both the tangential and radial stresses of the permanent magnets, while also decreasing the equivalent stress in the sleeve, thus enhancing the structural safety of the rotor. As the interference fit increases, the radial stress on the permanent magnets gradually decreases, while the tangential and equivalent stresses in the sleeve first increase slowly and then rapidly. When the interference fit is below 0.26 mm, the stress variation is minimal, but once it exceeds 0.26 mm, the sleeve stress increases significantly, indicating that excessive interference may lead to stress concentration and a higher risk of failure. Temperature elevation significantly increases the tangential and equivalent stresses in the permanent magnets, and the tangential and equivalent stresses in the sleeve also increase linearly with rising temperatures. At high rotational speeds, the maximum tangential stress experienced by both the permanent magnets and the sleeve increases substantially, highlighting the need for careful optimization of materials and structure in the design phase.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".