Symmetrische Komponenten in Wechselstrommaschinen by Dr.-Ing. Karl Paul Kovács (auth.)

By Dr.-Ing. Karl Paul Kovács (auth.)

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40) 64 2. Asymmetrischer Betrieb von Asynchronmaschinen Anstatt i2 setzt man, bei Benützung des aus dem Stromvektordiagramm (bei Spannung u 1) als bekannt angenommenen, dem Schlupf 2 zugeordneten Stromes (i2s), den Wert ein. Dann nimmt die Beziehung (2. 41') ist die Gleichung solcher Ellipsen, deren halbe Längsachse 1 und die halbe Querachse 1/i2s Vk (in Parameterwerten i2s und k) beträgt. Diese Ellipsen sind in Abb. 23 für verschiedene Werte i2s (i2s = 3, 4 und 5) und für verschiedene Parameterwerte k (k = 2, 3 und 4) dargestellt.

Da in diesem Falle der Strom der Phase a ist, ergibt sich daher i2 = 0,5. Die Werte der Ströme ib und ic können auf Grund der Beziehungen a ib = = i 1 + a 2 i 2 und a2 ic = i 1 + a i 2 bestimmt werden. 28) Werden die Werte obigen Beispiels zugrunde gelegt, so beträgt der gesamte Kupferverlust des Motors bei der ungünstigsten Bedingung des unveränderten Phasenstromes: ;~ + ;~ = 0,25 + 0,25 = 0,5 ' was nur die Hälfte jenes Wertes ist, der sich bei der Bedingung des unveränderten Verlustes ergibt, in welchem Falle if + ;~ = 1 ist.

46) R2 woraus ~ (1,5 -7- 2) k R, = Rr [(1,5 -7- 2) k = 1+ 4 + ,U 4 + (p,~osrp,)•] , (2,67-:- 2) fl . + (p, co~rp,) 2 In Abb.

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