| 摘要 |
823,898. Magnetic amplifiers. GENERAL ELECTRIC CO. Oct. 22, 1957 [Oct. 23, 1956], No. 32918/57. Class 40 (9). An auto-self-excited transductor 59, Fig. 5, comprises a main load 56 such as a capacitive circuit or a motor capable of producing counter electromotive forces, and a parallel auxiliary load resistance 64 the value of which is high compared with that of the main load, each load circuit including a respective self-excitation rectifier 57, 65. In this arrangement the auxiliary load takes sufficient current to permit the firing angle of the current through the main winding 58, as determined by energization of the control winding 60, to be unaffected by counter voltages developed by the main load. The arrangement may be applied to an autoself-excited full-wave rectifying transductor, Fig. 1, in which the main load 10 and the auxiliary load 26 are associated with selfexcitation rectifiers 11, 12 and 27, 28, respectively. Alternatively the main load 67 and auxiliary load 79, Fig. 6, may be connected to an auto-self-excited bridge rectifying transductor as shown, the auxiliary load circuit requiring four rectifiers 80-83 connected in a bridge. A three-phase embodiment is also described, Fig. 4, in which a three-phase supply 29 is connected to a main load 46 by way of main transductor windings 30-35 and self-excitation rectifiers 38-43, while the auxiliary load is connected to the main windings through self-excitation rectifiers 49-54. |
