G - Physics – 11 – B
Patent
G - Physics
11
B
318/20, 352/21.3
G11B 21/08 (2006.01) G05B 5/00 (2006.01) G05B 6/00 (2006.01)
Patent
CA 1171524
197,184 CAN/WDB CONTROL SYSTEM FOR TRANSDUCER POSITIONING MOTOR Abstract A control system for a stepper motor utilized in positioning a transducer (18) in relationship to a plurality of parallel tracks (14, 16) on a record media (10). Dual closed loop feedback systems are provided. A current control circuit is provided having a high output impedance and a voltage control circuit is provided having a low output impedance. A switch (30) may select the current control sensor (28) when the transducer (18) is making coarse adjustments in position and may select the voltage control sensor (32) when the transducer (18) is making fine adjustments in position. A seamless switch- over may be achieved where the voltage control sensor (32) has a time constant which matches the time constant of the stepper motor. Performance is further improved by pro- viding an impedance cancellation circuit (252, 254, 256, 258, 260, 262) which eliminates the internal resistance of the motor in order to quickly damp motionally induced emf of the motor.
385152
Minnesota Mining And Manufacturing Company
Smart & Biggar
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