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The objective of this article is to study the speed control of a DC motor using PID controller and understand the Ziegler-Nichols (ZN) tuning method for a PID controller. PID controllers are widely used in many industries such as paper mill, cotton textile industries. PID controller also finds its applications in drones. The usefulness of PID lies in its general applicability. [ABSTRACT FROM AUTHOR]

Mechanical methods of weeding are preferred over other methods of weed control because of their added advantages of simple construction, low cost and environmental friendly. Mechatronics concept was incorporated in development of a battery-assisted four-wheel weeder for weeding operation in wide row (more than 30 cm) crops. The developed machine consisted of brushed DC motor, DMSC, battery, power transmission system, drive-wheels, front wheels, frame and swinging handle. A brushed DC motor of 250W powered by 24V-14Ah battery with sweep type weeding tool performed satisfactorily in the field for weeding operation up to 147N draft.The operators are to only guide the weeder up to 147N draft while they need to apply their muscle power beyond 147N to prevent slippage.The average field capacity with this machine was 0.0554 ha/h at walking speed of 2.52 km/h with 97.5% weeding efficiency. The machine is gender-friendly with simple in design and technology and has potential to be adopted by small and hill farmers with reduced drudgery. The concept of transforming manual operated to battery assisted weeder was found satisfactory for wide row crops.

The papers presents a high performance speed and position control system for separately-excited D.C. motor, which was designed and performed with a dedicated integrated circuits (L290, L291, L292), made by SGS-THOMSON Microelectronics Company. The L290, L291 and L292 together form a complete microprocessorcontrolled (microcomputer chips) DC motor servo positioning system that is both fast and accurate with an adequate software . The papers presents a description of the system, detailed function descriptions of each device and application information.

The papers presents a high performance speed and position control system for separately-excited D.C. motor, which was designed and performed with a dedicated integrated circuits (L290, L291, L292), made by SGS-THOMSON Microelectronics Company. The L290, L291 and L292 together form a complete microprocessor-controlled (microcomputer chips) DC motor servo positioning system that is both fast and accurate with an adequate software . The papers presents a description of the system, detailed function descriptions of each device and application information. [ABSTRACT FROM AUTHOR]