| 摘要 |
<p>PURPOSE:To reduce speed variations during the magnetic field control by correcting a deviation between an armature voltage and a voltage set for starting the magnetic field control with an armature current. CONSTITUTION:A first function generator 4 receives a deviation epsilon between a speed command voltage and the output voltage of a current limiting circuit 2 and provides a voltage Vac proportional to at epsilon<epsilon' (specified magnitude) or a fixed voltage Vacmax at epsilon>epsilon1 to an armature voltage controlling circuit 5. On the other hand, a limiter 11 receives a deviation gamma between a voltage Vcs set for starting the magnetic field control and an armature voltage Vl and a correction voltage VCR corresponding to an armature current Ia and outputs zero curent at gamma<0(0<epsilon<epsilon1), a limiter curreent Il proportional to gamma at 0<gamma<gamma2 or a fixed current Ilmax at gamma>gamma2. A magnetic field controlling circut 13 receives a deviation between a current Ic corresponding to a reinforcing magnetic field current Ifmax and the limiter current Il.</p> |
