Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1980-10-15
1983-05-10
Truhe, J. V.
Electricity: motive power systems
Open-loop stepping motor control systems
318685, 318561, G05B 500, G05B 600
Patent
active
043832091
ABSTRACT:
A control system for a stepper motor utilized in positioning a transducer in relationship to a plurality of parallel tracks on a record media. 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 may select the control sensor when the transducer is making coarse adjustments in position and may select the voltage control sensor when the transducer is making fine adjustments in position. A seamless switchover may be achieved where the voltage control sensor has a time constant which matches the time constant of the stepper motor. Performance is further improved by providing an impedance cancellation circuit which eliminates the internal resistance of the motor in order to quickly damp motionally induced emf of the motor.
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Machine Design, vol. 49, No. 25, 1977, "Current Sensors Close the Loop in Stepper Controls," pp. 147 to 148.
IBM Technical Disclosure Bulletin, vol. 24, Nr. 1B, Jun. 1981, P. A. Cook et al., "Step Motor Chopper Driver", pp. 574 to 575.
Alexander Cruzan
Bauer William D.
Evans A.
Minnesota Mining and Manufacturing Company
Sell Donald M.
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