File:PWM-Intensity.jpg
PWM-Intensity.jpg (618 × 355 pixels, file size: 56 KB, MIME type: image/jpeg)
Captions
DescriptionPWM-Intensity.jpg |
English: A simplified example of pulse-width modulated (PWM) voltage supply to a magnetic circuit. The voltage (blue waveform) in a magnetic circuit is proportional to the rate of change of the flux density (red waveform). Therefore, by using PWM supply the resultant flux density can be controlled with relative ease. This method is commonly used for supplying electric motors, in which the torque is proportional to the flux density. As can be seen, with a series of appropriately modulated voltage impulses the resultant flux density can be modulated to be close to desired sinusoidal waveform. In the example shown (for 50 Hz), for clarity the switching frequency is 600 Hz, in real devices the switching frequency is much higher - even up to 10 kHz or higher. Of course, for higher fundamental frequency the switching frequencies would be even higher.
Polski: Przykładowe przedstawienie modulacji szerokości impulsu (PWM) dla obwodu magnetycznego. Napięcie elektryczne (niebieski przebieg) w obwodzie magnetycznym jest proporcjonalne do szybkości zmian indukcji magnetycznej (czerwony przebieg). Dlatego też, poprzez użycie PWM wypadkowa indukcja magnetyczna może być kształtowana z względną łatwością. Metoda ta jest szeroko stosowana do zasilania i kontrolowania pracy silników elektrycznych, w których moment obrotowy na wale silnika jest proporcjonalny do indukcji magnetycznej. Jak widać na rysunku, wypadkowa indukcja (dąży się zazwyczaj do kształtu sinusoidalnego) może być łatwo kształtowana poprzez użycie odpowiednio modulowanych impulsów. W pokazanym przykładzie (dla 50 Hz), dla jasności rysunku użyto częstotliwość przełączania 600 Hz. W rzeczywistości jednak stosuje się znacznie większe częstotliwości przełączania - nawet do 10 kHz lub więcej. Oczywiście dla nośnych częstotliwości wyższych niż 50 Hz częstotliwości przełączania będą znacznie większe. |
Date | (UTC) |
Source | |
Author |
|
This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: B to generic. The original can be viewed here: PWM, 3-level.svg: . Modifications made by Peperre.
|
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. | ||
| ||
This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue |
Original upload log
[edit]This image is a derivative work of the following images:
- Image:PWM,_3-level.svg licensed with Cc-by-sa-2.5,2.0,1.0, Cc-by-sa-2.5,2.0,1.0, GFDL
- 2007-03-24T20:36:13Z Zureks 688x475 (18542 Bytes) {{Information |Description=An example of pulse-width modulated voltage supply to a magnetic circuit. The voltage (blue waveform) in a magnetic circuit is proportional to the rate of change of the flux density (red waveform).
Uploaded with derivativeFX
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 09:40, 12 December 2008 | 618 × 355 (56 KB) | Peperre (talk | contribs) | {{Information |Description='''English''':<br> A simplified example of pulse-width modulated (PWM) voltage supply to a magnetic circuit. The voltage (blue waveform) in a magnetic circuit is proportional to the rate of change of the flux density (red wavefo |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
File usage on other wikis
The following other wikis use this file:
- Usage on ca.wikipedia.org
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
_error | 0 |
---|