Download Elektrotechnik für Maschinenbauer by Professor Dipl.-Ing. Hermann Linse (auth.) PDF

By Professor Dipl.-Ing. Hermann Linse (auth.)

?ber den Autor/Hrsg
Prof. Dipl.-Ing. Hermann Linse, Esslingen (verst.) Prof. Dr.-Ing. Rolf Fischer, FH Esslingen

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Elektrotechnik für Maschinenbauer

? ber den Autor/HrsgProf. Dipl. -Ing. Hermann Linse, Esslingen (verst. ) Prof. Dr. -Ing. Rolf Fischer, FH Esslingen

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R ergibt. b) Man berechne siimtliche in der Schaltung auftretenden Spannungen, Strome und Leistungen, wenn U = 30 V und R = 60 n ist und fiihre die Kontrollen durch. In Laboratorien und Priiffe1dem benotigt man zur Speisung e1ektrischer Stromkreise Mufig Spannungen, die von Null bis zu einem Hochstwert moglichst stufenlos verstellbar sind. Da die ublichen Spannungsquellen Akkumulatoren, das Stromversorgungsnetz usw. B. 2 Gleichstromkreise 25 quelle und Verbraucher (Widerstand Rv) ein Spannungsteiler in Form eines Schiebewiderstandes Rs mit 3 Klemmen geschaltet.

20) . 2 Gleichstromkreise 35 Eigenverbrauch eines Me8instruments Darunter versteht man die bei einer Messung in der MeBwerkspule und in den vorhandenen Reihen- und Parallelwiderstanden insgesamt auftretende Leistung. B. 2Sa 0,6 V . 2Sb 30 V· 3 rnA = 90 mW. Der Eigenverbrauch steigt von der Nullstellung des Zeigers bis zum Vollausschlag nach Gl. 17b) quadratisch mit dem zu messenden Strom bzw. der zu messenden Spannung an; bei halbem Vollausschlag betragt er deshalb 1/4 der vorstehend ermittelten Werte.

1 Gleichstrom so mehr verloren, je groBer RslRv bzw. /vRs wird (s. 32). 2 Elektrische Spannungsquellen Die Physik kennt zahlreiche M6glichkeiten zur Erzeugung elektrischer Spannungen. Die folgenden Spannungsquellen haben zur Erzeugung elektrischer Energie fUr Zwecke der Energietechnik Bedeutung erlangt. Elektrodynamische Spannungsquellen (Generatoren) Die elektrische Spannung in Generatoren wird durch Induktion im Magnetfeld erzeugt (s. Abschn. 3). Die Umwandlung von mechanischer Energie in Gleichstrom ist sowohl in der offentlichen Stromversorgung als auch im Kraftfahrzeug (Lichtmaschine) zu Gunsten des Drehstroms verlassen worden.

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