GB353489A - Asynchronous electric cascade generator - Google Patents

Abstract

353,489. Induction machines. FORGES ET ATELIERS DE CONSTRUCTION ELECTRIQUES DE JEUMONT, 75, Boulevard Haussmann, Paris. March 25, 1930, No. 9503. Convention date, April 16, 1929. [Class 35.] In an asynchronous generator group comprising an induction machine cascaded with a single frequency changer of commutator type or a double or two-part frequency changer of commutator type, the resultant voltage which the frequency changer supplies to the induction machine is varied in magnitude and phase by varying the two component voltages suppled to the frequency changer. Fig. 1 shows the use of two induction regulators R1, R2 the secondary windings of which supply separate voltage components to the slip-rings B1, B2 of a double frequency changer arranged in cascade with an induction generator, as described in Specification 292,465. Alternatively, both terminals of the secondary windings may be brought out on each phase, thus involving six slip-rings on each frequency converter. In the form shown in Fig. 5, the induction regulators R1, R2 give equal voltages and the secondary side of one of them is connected to the secondary of a transformer T, the secondary voltage of which is dephased by ninety electrical degrees from that of the regulators. In place of a two-part frequency changer a single one may be used, the slip-rings of which are connected to the secondaries of the induction regulators in threephase, as shown in Fig. 3, or in six-phase by means of six brushes. A transformer corresponding to that shown at T in Fig. 1 may also be used in connection with a single frequency changer. The frequency changers may have compensating and commutating windings on their stators and constitute a group running at constant power, in which case the induction regulator or regulators furnish only the magnetizing power required by the frequency changers. Specification 292,465, [Class 35, Dynamo-electric generators &c.], is referred to.