REEL TENSION CONTROLLING METHOD AND APPARATUS

Title:

REEL TENSION CONTROLLING METHOD AND APPARATUS

Document Type and Number:

WIPO Patent Application WO/1985/003061

Kind Code:

A1

Abstract:

In conventional reel tension control, it has been impossible to control reel tension ratio over a wide range exceeding 1:10, with a single D.C. motor. Hitherto, therefore, various measures have been taken for attaining such a high ratio of tension control, such as the use of a plurality of D.C. motors, use of variable speed changing gear between the reel and the motor, and so forth. The invention is based on a discovery of the fact that the unfavourable effects such as change in the characteristics and inferior rectification which are attributable to the use of a magnetic field of low level can be suppressed remarkably if the armature current is limited only to a low level. Namely, according to the invention, the magnetic field is set at a low level such that the ratio between the magnetic flux of the field and the coil diameter falls below the maximum value and the upper limit of the armature current in the motor is selected at a low level, thereby attaining a stable tension control in a low range of tension, which control could never be attained conventionally by a single D.C. motor.

Inventors:

KISAKIBARU TOSHIRO (JP)
GOTOH TSUGUO (JP)
OHUCHI KAZUNORI (JP)
OHHO HIROSUKE (JP)

Application Number:

PCT/JP1985/000012

Publication Date:

July 18, 1985

Filing Date:

January 14, 1985

Export Citation:

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Assignee:

YASKAWA DENKI SEISAKUSHO KK (JP)

International Classes:

B65H23/195; B65H23/198; H02P7/06; B65H59/38; H02P7/298; H02P23/16; H02P27/06; (IPC1-7): B65H23/198; B65H23/185

Foreign References:

JPS58139955A	1983-08-19
JPS5817052A	1983-02-01
JPS5822250A	1983-02-09
JPS5132790B1	1976-09-14
JPS5815421Y2	1983-03-28
JPS5443152B2	1979-12-18

Other References: