| 摘要 |
PURPOSE:To rapidly attenuate a counterelectromotive force by applying a reverse excitation to a self-shunt field with the counterelectromotive force of a motor generated by the inertial rotation as a power source. CONSTITUTION:When a pantograph 2 is raised and a motor generator operating start command is outputted by a driver, a breaker 4 is closed to flow current from a power source 1 through the pantograph 2, a disconnecting switch 3 to an armature 56, a series field 9 and a shunt field 11 to start rotating of armatures 5, 6, and necessary power is generated from a generator coupled directly to the armatures. A field current of if0 is flowed through the field 11 in the normal operation state. When the switch 3 is shifted to the ground side by an operation stop command, field changeover switches 17, 18 are closed in cooperation therewith, and a current of the direction designated by a field current if1 is flowed to the shunt field 11 with the counterelectromotive force as a power source, and the counterelectromotive force is rapidly attenuated. |
