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Metody modulacji szerokości impulsu z widmem rozproszonym
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ISBN10: 6208611644
ISBN13: 9786208611644
Publisher: Wydawnictwo Nasza Wiedza
Published: Jan 30 2025
Pages: 160
Weight: 0.49
Height: 0.37 Width: 6.00 Depth: 9.00
Language: Polish
ISBN13: 9786208611644
Publisher: Wydawnictwo Nasza Wiedza
Published: Jan 30 2025
Pages: 160
Weight: 0.49
Height: 0.37 Width: 6.00 Depth: 9.00
Language: Polish
W ostatnich latach falowniki napięcia z modulacją szerokości impulsu (PWM-VSI) stają się popularne w zastosowaniach z napędami o zmiennej prędkości ze względu na wewnętrzną kontrolę zarówno napięcia, jak i częstotliwości w falowniku. W celu regulacji zarówno napięcia, jak i częstotliwości, opracowano różne metody PWM dla napędów zasilanych VSI. Aby wygenerowac wzór impulsu dla napędów zasilanych przez VSI, istnieją glównie dwa podejścia, a mianowicie podejście cyfrowe (podejście wektora przestrzennego) i podejście porównania nośnych. W podejściu cyfrowym czasy przelączania są obliczane i podawane do liczników, które generują momenty przelączania. Natomiast w podejściu porównywania nośnych, sygnal referencyjny lub modulujący będzie porównywany z sygnalem nośnym (zwykle trójkątnym), a następnie punkty przecięcia decydują o momentach przelączania dla urządzeń falownika. Spośród tych dwóch podejśc metoda porównywania nośnych zyskuje na znaczeniu ze względu na prostszą implementację.
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