Title:
MOTOR CONTROLLER
Document Type and Number:
WIPO Patent Application WO/1990/015474
Kind Code:
A1
Abstract:
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.
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Inventors:
CHIBA HIROSHI (JP)
MIURA SATOSHI (JP)
HATTORI MOTONOBU (JP)
OBATA TAKESHI (JP)
MIURA SATOSHI (JP)
HATTORI MOTONOBU (JP)
OBATA TAKESHI (JP)
Application Number:
PCT/JP1990/000744
Publication Date:
December 13, 1990
Filing Date:
June 07, 1990
Export Citation:
Assignee:
HITACHI LTD (JP)
International Classes:
H02P27/06; D01H1/32; H02P5/74; (IPC1-7): D01H1/244; D01H1/26; H02P7/74
Foreign References:
| JPS6026496A | 1985-02-09 | |||
| JPS60155729A | 1985-08-15 | |||
| JPS63283498A | 1988-11-21 |
Other References:
See also references of EP 0537344A1
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