File:Magnetic Noise Experiment with a Tuning Fork- Constant Frequency.webm
Original file (WebM audio/video file, VP8/Vorbis, length 11 s, 854 × 480 pixels, 538 kbps overall, file size: 708 KB)
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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 electrical systems such as rotating machines (e.g. permanent magnet synchronous machine, induction machines) or passive components (e.g. inductors).
A coil powered by a fixed frequency AC current is put around a Tuning Fork prong. The current source create an AC flux density flowing in the magnetic circuit and the airgap created by the two iron prongs. Maxwell forces attract the two fork tips (equivalent magnetic dipole) similarly to what happens between the opposite polarities of North and South magnets. This magnetic force creates a vibration of the tuning fork prongs at twice the current frequency because magnetic force is proportional to the square of the flux density. The fork tips behave like an acoustic linear quadrupole. A strong tonal noise is created without any mechanical contact between excitation coil and tuning fork, illustrating the origin of the whining noise of electric motors. ©Eomys Engineering 2017 -- http://www.eomys.com |
| Date | |
| Source | YouTube: Magnetic Noise Experiment with a Tuning Fork: Constant Frequency – View/save archived versions on archive.org and archive.today |
| Author | EOMYS ENGINEERING |
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This file, which was originally posted to YouTube: Magnetic Noise Experiment with a Tuning Fork: Constant Frequency(archive), was reviewed on 13 February 2020 by the automatic software YouTubeReviewBot, which confirmed that this video was available there under the stated Creative Commons license on that date. This file should not be deleted if the license has changed in the meantime. The Creative Commons license is irrevocable.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 07:29, 20 June 2018 | 11 s, 854 × 480 (708 KB) | Vislupus (talk | contribs) | Imported media from https://www.youtube.com/watch?v=y9JyYLBRGnk |
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