Tape transport system including a logical network for producing quadrature pulse trains and motor control utilizing same
AssigneeBurroughs Corporation
InventorJohn E. Sargunar
Life of this patent
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Abstract
A constant speed reel-to-reel tape transport system is described including a drive motor having a pair of quadrature windings, and a motor supply producing a pair of square-wave motor-drive pulse trains of the same repetition rate, but 90.degree. out of phase, one train being supplied to each of the quadrature windings. The system further includes control means responsive to the change in the effective radius of one of the reels, for example the drive reel, for varying the repetition rate of the pulse trains, and thereby the speed of the motor, to maintain a constant linear tape speed.
Claims7
A constant speed reel-to-reel tape transport system, comprising:
- a tape drive reel;
- a tape supply reel;
- a drive motor driving the drive reel;
- said drive motor including a pair of quadrature windings;
- motor supply means producing a pair of square-wave motor-drive pulse trains of the same repetition rate, but 90.degree. out of phase, and supplying one train to each of the quadrature windings of the drive motor to control its speed in accordance with the repetition rate of the pulse trains;
- and control means responsive to the change in the effective radius of one of said reels for varying the repetition rate of said pulse trains, and thereby the speed of the motor, to maintain a constant linear tape speed.
Dependencies are inferred from the claim text.