Design aspects of a high speed permanent magnet synchronous motor / generator for flywheel applications
Bibliographic record
Abstract
This paper presents aspects of the design solution for a high speed, high efficiency permanent magnet machine used as a motor/generator (M/G) unit in a flywheel energy storage system. The motor is operated in a vacuum with passive cooling; thus the right choice of permanent magnet properties and ability to withstand demagnetization due to the temperature variation and armature reaction is important for the M/G design. Additionally, the M/G is operated with magnetic bearings so radiation is the only heat transfer method for rotor losses. Because of that, special measures are directed toward reducing the rotor losses. Analytical design results obtained by using a commercial motor design software package are presented. An investigation of the armature reaction and magnet demagnetization is performed using the magnetic circuit method and 2D finite element analysis (FEA). The results of the transient 2D FEA are presented. The value of the axial force applied to the rotor due to the stator slots skew as a function of stator current is determined using 3D FEA simulation. The final design results in good torque performance over the entire operating range
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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 source (direct Gemma or distilled Codex), 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".