| 摘要 |
<p>PURPOSE:To prevent an electric brake from unnecessarily operating by operating the brake only when the speed of an electric railcar is the effective brake finishing speed or higher of the brake. CONSTITUTION:A speed comparator 23 generates a command of the effective brake finishing speed V0 of an electric railcar, and an AND circuit 24 applies a command to a closing circuit 15 according to the AND condition of a brake command and a command from the comparator. Thus, a line breaker 7 is closed, and a field chopper controller 18 controls a field chopper 12 to gradually start flowing a current to a shunt field winding 10. When the voltages of the armature 4 and trolley line 1 from DC transformers 5, 13 coincide, a comparator 16 produces a command. In this manner, the line breaker 3 is closed, and the controller 18 alters its control pattern to generate a regenerative brake torque.</p> |
