| 摘要 |
<p>PURPOSE:To enable to simultaneously control field currents by detecting the maximum value of armature currents of respective groups as a brake force return signal to a field control system and applying as a command value of respective armature control system the maximum value of the reference command value and armature currents of other groups. CONSTITUTION:A maximum value detecting circuit A0 selects the maximum value of armature current Ia1-Ia4 of respective groups, and a multiplier c multiplies the output of the circuit A0 by a field current If and feeds back a real brake force to a shunt field control system. When the current If reaches the maximum value, a gate G is opened. Respective armature control systems B1, B2 input as a command value the maximum values of armature current command value Ip and the currents Ia1-Ia4 of other groups. In this manner, the shunt field currents of the respective groups can be simultaneously controlled by one exciter.</p> |
