| 摘要 |
PURPOSE:To eliminate to flow an excess current from a power source at a recovering time by maintaining the DC voltage of a smoothing condenser substantially constant by a regenerative control at an instantaneous power interruption time. CONSTITUTION:If a motor IM is disposed at a crossover track to instantaneously interrupt a power when the motor is operated with power, the output signal Ism of a DC voltage controller AVR increases to exceed the set level of a Schmitt circuit SH. Then, a switch circuit SW which is connected to a side so far is converted to (b) side. Accordingly, the torque command value T'e* of the motor IM becomes negative value and hence a regenerative command. Thus, the rotary energy of the motor IM is regenerated to a smoothing capacitor Cd. Thus, the DC voltage Vd of a smoothing condenser Cd does not extremely decrease, but even if a power source voltage Vs becomes reenergized state, a converter CONV can be always normally operated. |
