Winding – tensioning – or guiding – Unwinding and rewinding a machine convertible information... – Carrier speed or tension control
Patent
1994-10-04
1995-11-14
Darling, John P.
Winding, tensioning, or guiding
Unwinding and rewinding a machine convertible information...
Carrier speed or tension control
2423345, G11B 1543
Patent
active
054659183
ABSTRACT:
In a current supply circuit for supplying a current to a reel-drive motor in a magnetic tape apparatus, the circuit includes: a conversion table storing a relationship between a radius of the magnetic tape wound on a reel and a target current to be supplied to the reel-drive motor, and the target current being converted to a digital command; a correction table storing a relationship between the digital command and an actual current flowing in the motor when the digital command is applied to the motor, the actual current being converted to a digital value; a command unit for outputting the digital command corresponding to the target current in accordance with the conversion table; a supply current control unit for supplying an analog current corresponding to the digital command to the motor; a first correction unit for applying first correction signal to the supply current control unit in response to the actual current flowing in the motor; and a second correction unit for supplying a second correction signal to the supply current control unit in accordance with an error to be corrected from the correction table with reference to the digital command.
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Darling John P.
Fujitsu Limited
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