Acoustic Noise and Vibration of an Interior Permanent Magnet Traction Motor: PWM Effect
Bibliographic record
Abstract
The pulse width modulation (PWM) fed permanent magnet motor drives have been widely applied in various applications. Plenty of work has been carried out to investigate the effect of PWM on motor losses and efficiency. In this paper, the focus is to study the impact of PWM on the acoustic noise and vibration performance of a 48-slot 8-pole interior permanent magnet (IPM) machine. The current and radial force harmonics generated due to the PWM effect are identified and the contributions to acoustic noise of the motor are outlined. Results show that the PWM effect on the acoustic noise levels for this motor are negligible since the total sound pressure levels (SPLs) are very similar for sinusoidal and PWM currents for base- and maximum-speed operations. However, the effect on acoustic noise can be significant if introduced PWM harmonics overlap with the stator's natural frequencies to cause resonance, which should be carefully considered during the design process.
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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 | 0.002 |
| 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) | 0.001 | 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".