Rotary Servo Motor Research Articles

Automatic solar-based pet food dispenser system

For the majority of people, having a pet is always simple, but caring for it will always be a pain in the neck since pet owners must devote a whole time to meeting the pet’s demands, which include food, shelter, medical care, love and attention. Nowadays, feeding is one of the most frequent issues that pet owners’ encounter due to heavy work schedule. As a result, the automatic solar-powered pet food dispenser system is useful for assisting pet owners in caring for their pet’s needs when they are away from home or on the road. This automatic pet feeder proposes a simple automatic pet food dispenser controlled using the Arduino as the main controller. DS3231 Real Time Clock (RTC) module that can assist in automatically giving the pets the right mealtime was employed. This helps the food dispensing process without the owner’s presence, which is unlike the manual pet feeding product. The project ensures that the pets are fed on schedule and that the amount of food released is controlled appropriately. Also, this project will employ solar energy as a green energy source for sustainable development. This project can feed the pets 20 grams or less pet food in a single meal, according to the servo motor rotation setting activated by the Arduino.

Research and implementation of steel barrel cover rotation correction

Given the problems of low efficiency and poor accuracy of manual adjustment of offset position in screen printing of steel barrel cover, an automatic correction method based on machine vision is studied. The mode of upper-lower computers is adopted. For barrel cover with screw holes, Hough circle detection determines the number and position of screw holes and calculates the rotation direction and angle based on the big screw holes as the orientation datum. For barrel cover without screw holes, which is characterized by a steel seal, a minimum area rectangle is adopted to calculate the rotation direction and angle by collecting the location parameters of the width of the rectangle. The lower computer, PLC, controls the servo motor rotation and exchanges data through the Modbus TCP protocol. The results show that the method can adapt to the characteristics of the screw holes and the steel seal. The rotation angle is within (−180°, 180°). The angular error was ± 0.50°. The method meets the requirements of accuracy and stability.

Internal resonances of nanorods in presence of surface energy effect: Nonlinear torsional vibration

In this paper, effects of the surface energy on the nonlinear torsional vibrations and internal resonances of nanorods are investigated. To this end, the second-order term with respect to angle of rotation is considered for the displacement field. In addition, the geometrically nonlinear strain–displacement relations are obtained based on the von-Kármán theory. Then, Hamilton’s principle is implemented to derive the governing equation of motion for torsional vibration of nanorod. In the governing equation of motion, the surface energy parameters are included by the surface elasticity theory. The multiple-scale method is employed to solve the governing equation of motion for fixed-free and fixed-fixed end conditions. The nanorod considered is made of aluminum and silicon because of different values of their surface parameters. The effect of surface energy parameters on the torsional frequencies of nanorods is investigated for different values of length, radius, frequency number, and amplitude of the nonlinear vibrations. In addition the cases of occurring, the internal resonances are reported. The results obtained in this research may be useful for better design of nanoelectromechanical devices such as nanobearings and rotary servomotors.

Perancangan Alat Penghitung Bibit Ikan Otomatis Dengan Metode Counter Berbasis Arduino

Fish and other aquatic animals are a source of protein for humans that are useful for building units in the biosynthesis of damaged human body parts and regulating and controlling body function metabolism. Automatic fish seed calculation aims to help fish cultivation to calculate the number of fish, as well as provide information on the results of the number of fish calculations. The Counter Up technique is a logical circuit that is used to count the input values in the input and output sections in the form of binary digits with a separate channel for each rank. The design system for the fish calculation system uses Arduino nano, one of the developments of a microcontroller that has a small size. The results of data testing carried out are in the form of servo motor rotation speed data, calculation counters and the maximum input power is 220 volts, the speed is 1300 rpm with a total of 468 calculation results. Fish seeds within 1 minute.

Application and research of robot sorting system based on LabVIEW

Sorting robot is a kind of artificial intelligence robot which has certain sense ability and can classify items. In the sorting industry, its appearance not only reduces the labor input, but also improves the production efficiency of the sorting industry. In this paper, a production line composed of linear Delta robot and 3-DOF robot is studied. The forward and inverse solutions are calculated by MATLAB and simulated by Solid Works. Through the visual processing function, communication function and axle card driving function of Lab VIEW software, the servo motor rotation is controlled to achieve the purpose of the end moving along the predetermined trajectory, and finally the visual sorting function is realized.

Research on the Nonlinear Characteristic of Flow in the Electro-Hydraulic Servo Pump Control System

In an electro-hydraulic servo system, the system flow is used as an intermediate variable to control the output displacement/force/speed of the actuator, and it plays the role of a medium for energy transmission and conversion. Therefore, the control of the system flow is the essence of state control for the system actuator. The purpose of this paper is to study the non-linear characteristics of pump control system flow and pave the way for high-performance control of the system. Based on the flow partition idea, the system output flow is divided into the dead zone, load zone, and saturation zone. We establish a mathematical model of the hydraulic system to analyze and study the effect of the nonlinear characteristics of the servo motor and the positive displacement pump on the system flow partition characteristics. We focus on the effects of the positive displacement pump shear flow internal leakage, pressure difference flow internal leakage, oil compression, servo motor rotation friction, and servo motor torque reserve rate on the system flow output, and analyze the partition characteristics of the system flow under different working conditions. We provide a theoretical basis for a high-precision control strategy for a hydraulic system.

Design and implementation of pipe cutting machine with AC servo motor and PLC based on HMI

This research aims to design a pipe cutting machine using an AC servo motor and PLC as a controller based on HMI (Human Machine Interface). The use of AC servo motors is done to maintain accuracy and precision in cutting pipe lengths. This research uses experimental methods which include hardware and software design. PLC LS XGT Series is used to control the pipe cutting machine automatically based on the input signal from the proximity and encoder. Proximity is used to detect the presence of pipe while the encoder is used to detect AC servo motor rotation. By knowing the number of turns of the AC servo motor through the encoder, the length of the pipe can also be determined. The AC servo motor with Mitsubishi HC-KFS43 400W models is used to pull the pipe, gripping the pipe, and moving the cutting machine while a modified AC circle saw motor is used to drive the cutting blade. Based on the results of the study, the cutting machine can cut pipes automatically according to the desired number and length of the pipe. The work process can be monitored and controlled on a computer through HMI.

Driver-behavior-based robust steering control of unmanned driving robotic vehicle with modeling uncertainties and external disturbance

In this paper, a steering robust control method based on professional driver behavior with modeling uncertainties and external disturbance is proposed for an unmanned driving robotic vehicle, to realize the accurate and stable steering control like a professional human driver. An unmanned driving robotic vehicle nonlinear dynamics model considering modeling uncertainties and external disturbance is established. A driver behavior model composed of an adaptive preview model, a driver path planning model, and a driver desired yaw rate model is established, with the influences on preview time and driver path planning strategy, respectively. On the basis of this, a robust steering controller based on professional driver behavior is presented, by taking road information, driver reaction delay time, and vehicle driving status as inputs and the servo motor rotation angle of the steering mechanical arm as output. The stability of the control system with modeling uncertainties and external disturbance is proved. A comparison of the analysis results of simulation and experiment among the proposed control method, other existing control methods, and professional human driver demonstrates the effectiveness of the proposed method.

Design and selection of servomotor for radial aircraft tire secondary molding machine

The company Meridian Air Tire using two method molding, molding machine transmission components design selection using mitsubishi J4 series servo motor and control system. Among them, the two-segment host pitch and rotary servo motor selection is the most typical, this paper on its design ideas and selection of a detailed discussion, for manufacturers to correctly select servo motor to provide reference.

Variable volume ratio free-piston expander: Prototyping and experimental campaign

This paper describes a dynamic model developed for control purposes of a novel free piston expander with a variable built-in volume ratio (BVR) for Organic Rankine Cycle (ORC) applications. In order to demonstrate the feasibility of the proposed concept and to validate the theoretical model, a test setup has been designed and built. An integrated two degree of freedom motor/alternator is substituted by a separate linear motor/alternator (LMA) and a rotary servo motor designed and made from standard industrial components. This approach gives a possibility to develop and to test the integrated alternator and the expander itself independently. The model has been validated by running the setup in compressor mode. The cogging force and the frictional force, which are difficult to obtain analytically, are identified and mapped. An estimation of the geometry and the mass of the piston of an integrated design has also been made. The obtained results are sufficient for the control algorithm development since all acting forces are calculated or estimated with a good accuracy.

Camera Stabilizer 2 Axis by Proporsional Integral Derivative (PID) Based LabView

Abstract - In taking a video on the camera results that are not much movement are needed, so that the video can be seen properly by the audience. In addition, the video does not have a lot of distortion which is caused by being unstable in its capture. Then a Camera Stabilizer is needed so that the resulting video remains stable. This camera stabilizer uses a computer device in making this program needed to make it easier for the operator to set the desired angle. In order to obtain the best stability, a tuning of the Proportional Integral Derivative (PID) controller parameter is performed. In this tuning we can find out the values of Proportional gain (Kp), Integral Time (Ti), and Derivative Time (Td). The PID controller can provide action to the servo motor controller based on the error obtained, the desired servo motor rotation value is called the setpoint. LabView software is used as a driver, motor speed control. Keyword : LabView, servo motor, arduino, accelerometer, computer

가슴 착용형 보행 재활로봇의 개발

This paper describes the development of a chest-wearable robot that can efficiently perform self walking rehabilitation without a helper. The features of the developed robot are divided into three parts. First, as a mechanical characteristic, the conventional elbow crutch is attached at the forearm. However, the proposed robot is attached to the patient's chest, enabling them to feel free to use their hands and eliminate the burden of the arms. Second, as a characteristic of the driving algorithm, pressure sensors attached to the chest automatically perceive the patient's walking intention and move the robot-leg thereafter. Also, for safety, it stops operating when an obstacle is found in front of the patient by using ultrasonic sensors and generates a beeping sound. Finally, by using the scotch yoke mechanism, supporting legs are moved up and down using a rotary servo motor without excessive torque that is generated by large ground reaction forces. We showed that the developed robot can effectively perform self walking rehabilitation through walking experiments, and its performance was verified using Electromyograph (EMG) sensors.

Torsional vibration analysis of double walled carbon nanotubes using nonlocal elasticity

In the present study, the torsional vibration behavior of double walled carbon nanotubes (DWCNTs) is investigated using nonlocal elasticity theory. The effects of van der Waals Force interaction, nanotube length and nonlocal parameter are studied in detail. Two frequency set are obtained for DWCNTs for a given half wave number. It is also shown that some mode shapes are anti-phase and some of them are in-phase. The present results can be useful in design of nano electromechanical systems like nanobearings and rotary servomotors.

Study on the Trajectory Planning of Hybrid-Driven Planar 3-RRR Mechanism

Hybrid-driven mechanism synthesis the constant speed motor and the servo motor as the power source through a multi degree of freedom mechanism. The text study on the trajectory planning of hybrid-driven planar 3-RRR mechanism. Firstly, based on compatible link combinations, all possible basic configurations of planar 3-dof kinematics chains were derived. Based on the requirements of hybrid-driven mode, the kinematics chains were selected one by one Planar 3-RRR mechanism was determined to be the research object finally. Then, based on the conclusions of inverse kinematics analysis, using the cubic spline function on point to point path planning, the servo motor rotation laws were presented. Comparing the different speed situation of constant motor, the influence trends on planning results were analyzed.

Research of System of Trailer Axle’s Function Test

Axle is one of the most important parts related to the safety of trailer’s operation on the railroad. In China, the checking of axles is mainly through visual inspection and hammer examinations. The construction of an automation hardware system was simulated by Pro/E, including support, guide rail, sensor, AC servomotor and servo driver conformed to the model. Next, for controlling the operation of the entire system, LabVIEW was used to write a program and to control the rotation of servomotor. The pressure heads controlled by linkage system were utilized to load the axle; meanwhile, through the PCI of NI, the data of pressure and displacement was collected. After calibration, the relative error of pinpointing sensor was 5.207%, and the average relative error was about 1.4%. Analyzed by SPSS, the voltage-load formula's correlation coefficient R is greater than 0.994, while the significance is less than 0.05, showing the regression of great significance. Finally, the capabilities of the simulated axle, such as fatigue, stiffness, intensity and stress, were analyzed carefully.

Design of High Speed NC Crankshaft Grinding Machine

Siemens AG SINUMERIK820 is used for high-speed numerical control (NC) grinder, which integers CNC and PLC and is safe and reliable. The mechanism of high speed spindle is that the motor and spindle are combined as one body; rapid feedrate is realized by steep-lead ball screw and increasing feed servo motor rotation speed; the wear particles of wheel are mainly of cubic Boron Nitride and diamonds; and the machine is more stable and reliable.

Design and Control of a Hydraulic Simulator for a Flexible-Joint Robot

For the first time, a novel experimental hydraulic system that simulates joint flexibility of a single-rigid-link flexible-joint robot manipulator, with the ability of changing the joint flexibility's parameters, was designed and implemented in this study. Such a system could facilitate future control studies of robot manipulators by reducing investigation time and implementation cost of research. It could also be used to test the performance of different strategies to control the movement of flexible-joint manipulators. A hydraulic rotary servo motor was used to simulate the action of a flexible-joint robot manipulator, which was a challenging task, since the control of angular acceleration was required. In this study, a single-rigid-link elastic-joint robot manipulator was mathematically modeled and implemented in which joint flexibility parameters such as stiffness and damping could be easily changed. This simulation is referred to as a 'function generator' to drive a hydraulic robot manipulator. In this study the desired angular acceleration of the manipulator was used as the input to the hydraulic rotary motor and the objective was to make the hydraulic system follow the desired acceleration in the frequency range specified. A hydraulic actuator robot was built and tested. The results indicated that if the input signal had a frequency in the range of 5–15 Hz and damping ratio of 0.1 (typical values for flexible joints), the experimental setup was able to reproduce the input signal with acceptable accuracy. Owing to the inherent noise associated with the measurement of acceleration and some severe nonlinearities in the rotary motor, control of the experimental test system using classical methods was a challenging task that had not been anticipated.

Incident-simulating device with wireless control for extracorporeal circulation crisis management drills

Incidents during extracorporeal circulation (ECC) may lead to serious consequences, and troubleshooting exercises are becoming more important. We developed an incident-simulation device operated by remote control for ECC crisis management drills, and evaluated its efficacy at a seminar for perfusionists. This compact device consists of a transmitter and a receiving system and is run by dry batteries without a personal computer. A 4-channel radio-control system is used as the transmitter, and four servomotors placed in a box as the receiving system. To simulate occlusion of 3/8" arterial and venous lines, two servomotors with a rod rotate and the rod compresses the tube. The tilt angle of the stick and the servomotor rotation are in proportion, so that the degree of occlusion is controlled. As a result, the tube lumen becomes "stenotic" and then occluded, depending on the rotation. To cut off the power, the other two servomotors, with a relay system, work as a breaker. When the rod of the servomotor rotates, a micro-switch is turned off. The present device is able to increase perfusion pressure quickly and to simulate inadequate venous drainage quietly. At a seminar for perfusionists, an instructor manipulated the transmitter to create incidents and the participants handled the events effectively. In conclusion, incidents created by this device were perceived as similar to real ECC crises and this device may be useful and educationally effective when used in crisis management drills for perfusionists and trainees.

Effect of servomotor control parameters on the dynamic behaviour of a coupled elastic shaft-elastic beam system

In this study, a servomotor-driven coupled elastic shaft-elastic beam system is analysed. This mechanism has considerable applications in the industry and can be present in vehicles. Equations of motion are derived with respect to the generalised coordinates of the elastic shaft, elastic beam and the servomotor rotation. Frequency equations and mode shapes for the elastic beam and elastic shaft are obtained assuming compliant boundary conditions. Non-linear terms, which come from the Coriolis, normal and tangential accelerations, are retained in the equations. The eigenvalues of the relatively elastic shaft-elastic beam system and relatively rigid shaft-elastic beam system are analysed with respect to the desired control frequencies and dampings of the servomotor.

Servomotor control of a coupled elastic shaft–elastic beam system

Abstract In this study, a servomotor driven coupled elastic shaft–elastic beam system is analyzed. The model consists of a servomotor, disk, and an elastic beam attached to the disk separated by an elastic shaft. Equations of motion are derived with respect to the generalized coordinates of the elastic shaft, elastic beam and the servomotor rotation. Frequency equations and mode shapes for the elastic beam and elastic shaft are obtained assuming compliant boundary conditions. Nonlinear terms which come from the Coriolis, normal and tangential accelerations retained in the equations. For a chosen example, disk rotation, servomotor rotation and beam vibration are obtained for a desired servomotor input rotation which assumes proportional plus derivative control. Results show that shaft elasticity not only affects the disk motion and beam vibrations but also alters the actual servomotor motion. Beam vibration amplitudes are lower when the shaft elasticity is higher. Nonlinear terms have also a lowering effect on the beam vibration amplitudes.