| 摘要 |
An electric synchronous machine is excited via rotating rectifiers by an exciter machine. To this end, the three-phase winding of the exciter machine is connected to two Y-connected rectifiers having different current conduction directions. One end of the field winding of the synchronous machine is connected to the central point of the three-phase winding. In addition, there is provided between the Y-point of the rectifiers and the other end of the field winding one thyristor each, to the control electrodes of which a parallel-connected voltage sensitive firing device is coupled. Furthermore, stationary electrical elements are connected to the exciter device via switches and auxiliary slip rings and liftable brushes. These elements contain a d-c current source which can be connected between the control electrodes and the cathodes of each thyristor in the forward direction in order to fire the former, as well as a capacitor which can be connected, for quenching, parallel to each thyristor, and also a de-energizing resistor which can be connected via antiparallel diodes in parallel with the field winding. In this manner, the direction of the field current of the synchronous machine can be reversed in order to obtain a given pole wheel position. |
