Operating Envelopes of the Variable-Flux Machine With Positive Reluctance Torque
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Bibliographic record
Abstract
Variable-flux interior permanent magnet synchronous motors (VFIPMSMs) find growing attention for electrified transportation applications, especially in the area of electric vehicles. While a prior focus was on optimizing the magnetization requirement to not oversize the inverter, and improving the machine power over a wide operating range, this paper aims to investigate and compare different possible operating envelopes of the VFIPMSM from the drive point of view. Demagnetizing the low-coercive magnets via only a short d-axis current pulse eliminates the need of continuously applying a negative d-axis current in the flux-weakening region; hence, lower copper loss and improved motor efficiency are expected. In this paper, this has been investigated and compared with the utilization of continuous negative d-axis current in the flux-weakening region considering the nonlinear demagnetization characteristics of the low-coercive magnets. The latter scheme has been seen to improve the high-speed output characteristics and to extend the speed range. Although a constant-power-speed range with VFIPMSMs is not feasible due to the irreversible demagnetization of lowcoercivity magnets, an improvement of high-speed output power is shown to be feasible via saliency manipulation with the latter scheme. A VFIPMSM with a positive-reluctance torque (inverted saliency L <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">q</sub> <; L <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">d</sub> ) is used for experimental validation.
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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 | 0.000 | 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 it