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Raspberry Pi and Arduino
Published in Rajesh Singh, Anita Gehlot, Lovi Raj Gupta, Bhupendra Singh, Mahendra Swain, Internet of Things with Raspberry Pi and Arduino, 2019
Anita Gehlot, Rajesh Singh, Lovi Raj Gupta, Bhupendra Singh, Mahendra Swain
A servo motor is a rotary actuator used for precise control of the angular position. It is comprised of a motor coupled with a sensor for position feedback. It also requires a servo drive. The drive uses the feedback sensor to control the rotary position of the motor precisely. This is called a closed-loop operation. The high torque standard servo motor with metal gears and 360° rotation can provide 11 kg/cm at 4.8 V, 13.5 kg/cm at 6 V, and 16 kg/cm at 7.2 V. Figure 6.8 shows the block diagram to interface the servo motor with Arduino. It is comprised of an Arduino Uno, a power supply, a liquid crystal display, a potentiometer (POT), and a servo motor. The system is designed to control the angle of the servo motor with the potentiometer.
Principles of Energy Conversion
Published in Hamid A. Toliyat, Gerald B. Kliman, Handbook of Electric Motors, 2018
Hamid A. Toliyat, Gerald B. Kliman
Brushless de motor operation and control requires an electronic circuit with the capability to apply the required voltage to the motor terminals to produce a pattern of current in the stator windings in synchronism with the rotor movement. The electronic control circuit must respond to rotor position sensors, input voltage source variations, and input commands for rotor shaft position, rotor speed or acceleration. For high performance servo operation, a feedback control is incorporated. The feedback control is active in controlling and limiting current to achieve a certain performance with the correct amount of damping to limit overshoot of current, position, and speed. A simplified motor controller is shown in Fig. 15.49 where various capacitors, snubbers, and inductors used for filtering and spike suppression are not shown.
Fundamentals of Digital Motion Control
Published in Richard L. Shell, Ernest L. Hall, Handbook of Industrial Automation, 2000
Ernest L. Hall, Krishnamohan Kola, Ming Cao
A servo system is a motor control system that combines various components to automatically control a machine’s operation. It is generally composed of a servo drive, a motor, and feedback device. The controller gets a feedback signal and outside control signal and controls the servo drive and motor together to precisely control torque, velocity, or position of the motor shaft. The feedback continuously reports the real-time status, which is compared to the command value. Differences between the command position and feedback signals are automatically adjusted by the closed-loop servo system. This closed loop provides the servo system with accurate, high-performance control of a machine.
Characteristic analysis and motion control of a novel ball double-screw hydraulic robot joint
Published in Engineering Applications of Computational Fluid Mechanics, 2022
Jie Shao, Yongming Bian, Meng Yang, Guangjun Liu
The control principle of the electro-hydraulic position servo control system is shown in Figure 7. The control system collects the actual rotation angle through the angle encoder, and controls the joint angle by closed-loop control. The controller transmits the calculated control signal to the servo amplifier for amplification and conversion. Then, the output angle and swing direction of the hydraulic robot joint are controlled by controlling the opening size and direction of the electro-hydraulic servo valve.