| 摘要 |
PURPOSE:To prevent unstableness of action associated with the simultaneous operation of two controls i.e. an armature voltage control and a magnetic field control by starting the magnetic field control after the completion of the armature voltage control detecting an armature voltage of a motor. CONSTITUTION:A first function generator 4 receives a deviation epsilon between a speed command voltage from an accelerator 1 and the output voltage from a current limiting circuit 2 and provides a voltage Vac proportional to epsilon at epsilon<epsilon1 (specified magnetude) or a fixed voltage Vacmax at epsilon>epsilon1 to an armature voltage controlling circuit 6. On the other hand, the deviation gamma between an armature voltage Vl and a voltage Vcs becomes negative at a low speed range (0<epsilon<epsilon1). A limiter 24 outputs zero current at gamma<0, a limiter current Il proportional to gamma at 0<gamma<gamma2 or a fixed current Ilmax at gamma>gamma2. A magnetic field control circuit 9 is supplied with a deviation between a current Ic corresponding to a reinforcing magnetic field current Ifmax and the limiter current Il. |
