Turn insulation aging of motors exposed to fast pulses of inverter drives
Bibliographic record
Abstract
The effects of fast pulses from PWM inverter AC drives on motor insulation are not well understood and their impact on long term reliability is not known. Turn insulation stresses have been simulated on small "layer-to-layer" specimens subjected to typical pulses of 120 ns rise-time at a repetition rate of 10 kHz. Voltage pulse overshoots reached 920 V. Under these conditions no partial discharge was detected. Measurements of capacitance, dielectric losses, relaxation currents, return voltage and thermally stimulated current (TSC) have been used to characterise insulation modifications resulting in the cumulative effects of multiple pulses. Preliminary results indicated that changes in the dielectric properties after a short exposure (1310 hours) to voltage alone were negligible. When specimens were exposed to both temperature and voltage, TSC results showed that some modifications of the dielectric properties could be initiated after short exposure time, even below the partial discharge inception voltage.
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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 | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 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".