VARIABLE SPEED PUMPING SYSTEM

摘要

PURPOSE:To realize an economic design of a cyclo-converter by automatically modifying an optimal rotary speed command to be determined according to a drive output command then operating at the outside of a forbidden band. CONSTITUTION:A rotary speed deviation signal outputted from an adding section 31 is fed to a guide vane opening correction signal circuit 32 then corrected by a signal fed from an optimal guide vane opening function generator 33 and fed to a hydraulic servo mechanism 14 for operating a guide vane. If there is a possibility that the optimal rotary speed will be within a forbidden band, the driving output is corrected automatically so as to set such that the lower limit of the forbidden band will be the upper limit based upon a rotary speed command. consequently, the forbidden band causes no actual trouble and an economic design of a cyclo-converter can be realized.