| 摘要 |
PURPOSE:To permit the starting of a magnetic field current control corresponding to the revolution by controlling the armature voltage based on the revolution. CONSTITUTION:A speed control circuit 8 outputs a current reference signal Vm corresponding to a deviation alpha between a signal Vac from an accelerator 1 and a speed signal Vg from a speed detection circuit 22. A current control circuit 3 controls a driving circuit 4 according to a deviation epsilon between the current reference signal Vm and a current signal Vi. A magnetic field current command circuit 8 outputs a signal Ii1 proportional to a deviation gamma when the deviation gamma between an armature voltage Va and a voltage Vcs at the magnetic field control starting point is gamma>0. The signal Ii1 is subtracted from the maximum reiforcing magnetic field current Ifmax to obtain a signal Ii2. A deviation beta between the signal Ii2 and a magnetic field current If and the minimum weakening magnetic field current Ifmin are provided to a magnetic field current controlling circuit 13 through a high voltage reference circuit 11. |
