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Class Information
Number: 318/696
Name: Electricity: motive power systems > Open-loop stepping motor control systems
Description: Subject matter in which a rotary electric motor; of the type in which the rotary element tends to assume a predetermined angular position when the motor is continuously energized; indexes in discrete angular increments of essentially uniform magnitude as a function of pulse inputs derived from outside the motor.










Patents under this class:
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Patent Number Title Of Patent Date Issued
4837493 System for driving drum Jun. 6, 1989
4835451 Switching circuit for five-phase stepping motor and method of switching May. 30, 1989
4833372 Control circuit for electric motor May. 23, 1989
4833385 Method for the phase synchronization of step-drive controlled equipment May. 23, 1989
4833593 Method for preparing information tables for a digital valve control apparatus May. 23, 1989
4831319 Method for the phase synchronization of step-drive controlled equipment May. 16, 1989
4831320 Duty factor control method May. 16, 1989
4829222 Stepper motor driver control circuit May. 9, 1989
4827200 Velocity control unit of detecting head May. 2, 1989
4825133 Electromechanical actuator control system Apr. 25, 1989
4825313 Method for adjustably positioning a transducer for a disc drive Apr. 25, 1989
4821644 Method and apparatus for positioning a member Apr. 18, 1989
4822019 Electronic equipment utilizing forward/reverse rotation of motor Apr. 18, 1989
4820963 Driving device for step motor Apr. 11, 1989
4816756 Circuit and method for statically testing rotating rectifiers in brushless alternators Mar. 28, 1989
4817007 Machine tool control systems Mar. 28, 1989
4812059 Printer apparatus with automatic gap adjusting mechanism Mar. 14, 1989
4812727 Stepping motor drive device Mar. 14, 1989
4806834 Electrical circuit for inductance conductors, transformers and motors Feb. 21, 1989
4803414 Method of controlling a step motor Feb. 7, 1989
4803415 Stepper motor control circuit and apparatus Feb. 7, 1989
4800334 Method of analyzing the voltage induced in an exciter coil of a stepping motor Jan. 24, 1989
4799002 Method of driving a five-phase stepping motor Jan. 17, 1989
4795953 Method of and electronic circuit for starting a reluctance motor and reluctance motor provided with such an electronic circuit Jan. 3, 1989
4792816 Device for transporting photosensitive material past an imaging line in text and graphics image setting apparatus Dec. 20, 1988
4791343 Stepper motor shaft position sensor Dec. 13, 1988
4791345 Driving device for a stepping motor Dec. 13, 1988
4789816 Stepping motor drive control apparatus Dec. 6, 1988
4789909 Method and apparatus for placing servo information at predetermined locations on a disc Dec. 6, 1988
4788484 Method and apparatus for driving a stepper motor with multiple voltages Nov. 29, 1988
4782276 Electric signal generator system and its application Nov. 1, 1988
4782277 Method of driving and controlling a stepping motor Nov. 1, 1988
4779031 Motor system Oct. 18, 1988
4779032 Drive device Oct. 18, 1988
4779033 Device for driving stepping motor Oct. 18, 1988
4777417 Head position control system for a disc storage unit Oct. 11, 1988
4777419 Control apparatus and method for operating a switched reluctance motor Oct. 11, 1988
4775825 Positioning method and apparatus therefor Oct. 4, 1988
4775902 Apparatus for recording and reading information on a magnetic disk with track following circuitry Oct. 4, 1988
4772839 Rotor position estimator for switched reluctance motor Sep. 20, 1988
4772840 Method and arrangement for controlling a stepping motor Sep. 20, 1988
4772841 Stepping motor and driving method thereof Sep. 20, 1988
4769585 Method of controlling a line-feed stepping motor in a printer and a driver circuit therefor Sep. 6, 1988
4769725 Servo head positioner using VCO and counter for digitizing position information Sep. 6, 1988
4768115 Stepper motor magnetic hysteresis correction using a stepping algorithm Aug. 30, 1988
4764698 A.C. electric motors having a stator forming orthogonal magnetic paths Aug. 16, 1988
4761590 Electric motor Aug. 2, 1988
4761598 Torque-angle stabilized servo motor drive Aug. 2, 1988
4760320 Stepping-motor driving circuit Jul. 26, 1988
4757245 Control system for a plurality of stepper motors Jul. 12, 1988

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