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PWM-Intensity
 

 

 

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Description 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. Polish:
Przyk?adowe przedstawienie modulacji szeroko?ci impulsu (PWM) dla obwodu magnetycznego. Napi?cie elektryczne (niebieski przebieg) w obwodzie magnetycznym jest proporcjonalne do szybko?ci zmian indukcji magnetycznej (czerwony przebieg). Dlatego te?, poprzez u?ycie PWM wypadkowa indukcja magnetyczna mo?e by? kszta?towana z wzgl?dn? ?atwo?ci?. 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 wida? na rysunku, wypadkowa indukcja (d??y si? zazwyczaj do kszta?tu sinusoidalnego) mo?e by? ?atwo kszta?towana poprzez u?ycie odpowiednio modulowanych impulsów. W pokazanym przyk?adzie (dla 50 Hz), dla jasno?ci rysunku u?yto cz?stotliwo?? prze??czania 600 Hz. W rzeczywisto?ci jednak stosuje si? znacznie wi?ksze cz?stotliwo?ci prze??czania - nawet do 10 kHz lub wi?cej. Oczywi?cie dla no?nych cz?stotliwo?ci wy?szych ni? 50 Hz cz?stotliwo?ci prze??czania b?d? znacznie wi?ksze.
Date 2008-12-12 09:39 (UTC)
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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).

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