Bi-directional motor drive servo

Details Bi-directional motor drive servo Bi-directional motor drive servo

G - Physics

05

B

318/60, 341/44.3

G05B 11/28 (2006.01) G11B 15/46 (2006.01)

Patent

CA 1060537

ABSTRACT A reel motor drive system using a first and a second signal for comparing an error signal derived from a tape tension sensing transducer with a respective polarity of separate positive and negative repetitive ramp signals. Each comparator produces an output signal as a series of constant frequency, duty cycle modulated pulses having a duration equal to the time that the error signal is greater than the ramp signal being compared thereto. These pulses are used as drive signals to a reel motor through a motor power amplifier and are used to develop mutually exclusive steering signals for selecting a motor drive direction by means of a steering logic circuit. The steering signals are also applied to the motor power amplifier to select a current path through the reel motor corresponding to the desired motor drive direction.

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