SPEED CONTROL DEVICE OF DIFFERENTIAL CENTRIFUGAL DEHYDRATION MACHINE

摘要

PURPOSE: To avoid an unusual increase in the regenerative power of a motor on a regenerative operation side when a power supply for a differential centrifugal dehydra tion machine which is powered by motors, one of which is in a power running mode and the other of which is in a regenerative running mode and at the same time, dehy drating, has recovered from a short time power supply failure. ;CONSTITUTION: If the speed of a motor 22 for a differential governor is accelerated during a power supply failure, a signal switching device 33 activates an instantaneous power supply failure frequency setting device 32 in which a higher value is set during the recovery of power supply. Therefore, the deviation range between the speed of the motor for a differential governor and a command value of frequency for the differential governor is narrow, so that a regenerative power can be restricted. The command value of frequency for the differential governor at a further higher level is gradually restored to an original value by action of a means for calculating a reduced speed. Consequently, the speed of the motor for the differential governor is restored to an original speed in a maintained deviation range, in accordance with a change in the command value of frequency for the differential governor, and thus the regenerative power is well controlled.;COPYRIGHT: (C)1994,JPO&Japio