公开(公告)号：EP0537344A4

公开(公告)日：1993-05-12

申请号：EP90908634

申请日：1990-06-07

申请人： HITACHI, LTD.

发明人： CHIBA, HIROSHI 248-1, HONGO MIMOMI-CHO ,  MIURA, SATOSHI 13-4, MIYAGIDAI 2-CHOME ,  HATTORI, MOTONOBU 26-19, MITSUWADAI 3-CHOME ,  OBATA, TAKESHI 248-1, HONGO MIMOMI-CHO

IPC分类号： H02P27/06 ,  D01H1/32 ,  H02P5/74 ,  H02P7/74 ,  D01H1/244 ,  D01H1/26

CPC分类号： H02P5/74 ,  D01H1/32 ,  H02P29/025

摘要： A motor controller using an inverter (103), which is useful for preventing coasting at the time of power failure or for keeping synchronous operation of a plurality of motors (105); and which has a construction wherein a voltage (VDC) on the D.C. side of the inverter (103) is compared with a target voltage (E), a correction signal associated with the difference is added to a speed instruction from the inverter (103) and the speed of the motor (105) is smoothly reduced at the time of power failure with a voltage (VDC) on the inverter D.C. side kept at the target voltage. When applied to a spinning frame or the like, the motor controller of the present invention can prevent non-uniform winding and breakage of yarns at the time of power failure.