File:Electromagnetic Vibration Experiment with a Rotating Magnet.webm
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Size of this JPG preview of this WEBM file: 703 × 600 pixels. Other resolutions: 281 × 240 pixels | 563 × 480 pixels | 844 × 720 pixels.
Original file (WebM audio/video file, VP8/Vorbis, length 9.8 s, 844 × 720 pixels, 367 kbps overall, file size: 438 KB)
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Summary[edit]
| Description |
English: This simple experimental setup illustrates the phenomenon of electromagnetic acoustic noise and vibrations - also called electromagnetically-excited noise, e-NVH or electrical noise - occurring in rotating electric machines (e.g. permanent magnet synchronous machine, induction machines). A Neodynium single-pole magnet is mounted on a rotating shaft and generates significant deflection of a ferromagnetic cylindrical shell, resulting in forced vibrations of the cylinder (equivalent to a slotless stator). When rotating at higher frequencies, these magnetic vibrations can generate audible noise, creating the so-called whining noise of electric motors.
The magnetic flux created by the magnet has one pole pair (one minimum, one maximum) but the resulting stator deformation has two pole pairs (two minima, two maxima) due to the quadratic relationship between magnetic force and magnetic flux density. ©Eomys Engineering 2017 -- http://www.eomys.com |
| Date | |
| Source | YouTube: Electromagnetic Vibration Experiment with a Rotating Magnet – View/save archived versions on archive.org and archive.today |
| Author | EOMYS ENGINEERING |
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This video, screenshot or audio excerpt was originally uploaded on YouTube under a CC license.
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Attribution: EOMYS ENGINEERING
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This file, which was originally posted to
YouTube: Electromagnetic Vibration Experiment with a Rotating Magnet – View/save archived versions on archive.org and archive.today, was reviewed on 26 June 2018 by reviewer Explicit, who confirmed that it was available there under the stated license on that date.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 07:29, 20 June 2018 | 9.8 s, 844 × 720 (438 KB) | Vislupus (talk | contribs) | Imported media from https://www.youtube.com/watch?v=5489-rzCaMQ |
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