G - Physics – 11 – B
Patent
G - Physics
11
B
341/44.3
G11B 15/06 (2006.01) G05B 11/18 (2006.01) G11B 15/56 (2006.01) G11B 23/12 (2006.01)
Patent
CA 1223941
ABSTRACT OF THE INVENTION A two mode control system for controlling the position of the tape in the buffers of a reel to reel tape system is presented. A constant current control mode is used when the tape position error is large, and a linear position control is used when the tape position error is small. Control is switched between the two modes, as required by the magnitude of the error, thus achieving the desired control while using minimal power. The system handles the worst case capstan reversal with a minimum turnaround time. Tape position is sampled at a rate that is a multiple of the mechanical resonance of the tape in the buffers, thereby minimizing the effect of the resonance on the measurement. The system further uses a feedforward signal during the initial stage of motor control to compensate for the lag in the position sensor.
446358
Smart & Biggar
Storage Technology Corporation
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