The transfer function is commonly used in the analysis of singleinput singleoutput electronic system, for instance. Why the speed torque characteristics of dc servo motor has large negative slope. The system structure of a dc motor is depicted in figure22, including the. Dc motor speed and direction controller project based on l293d hbridge and 555 timer ic. Simulate a dc position control system using matlab and. Control systems lab laboratory manual muffakham jah. In experiment3 and 4, the speed of the dcmotor was controlled by using an openloop voltage control. Simple speed control of dc motor 94 lab experiment 14. Basics of dc motors for electrical engineers beginners. Breadboard drawing of an arduino connected to a motor driver to control a dc motor.
All outputs are ttl signals, input supply 515v dc, dc bus voltage should be between 1. The application meets the following performance specifications. Engage the prony brake and record the speed and input ac current for 4 different torque loads. The dc motor control experimental setup offers rich possibilities for learning the practical aspects of control systems design and implementation. The 293d provides bidirectional drive current up to 600ma a voltage from 5v to 12v. In armaturecontrolled dc motors, the applied voltage va controls the angular velocity w of the shaft. V curves and inverted v curves of synchronous motor 8. C motor of the same size, but radio frequency interference is a problem in some applications. In particular, we will choose and tune the gains of a pi. Figure 2 torquespeed curves for a separate field excitation motor. The speed of dc servo motor is controlled by varying the armature voltage. Control systems lab laboratory manual prepared by p. Closedloop speed control and comparison of openloop and closedloop speed control of a dc motor. Its operation is based on the principle that when a current carrying conductor is placed in a.
To determine frequency response of a second order system and evaluation of frequency domain specifications. The electronic circuits created to control these motors and schematics for pcbs, tips to reduce noise over important signals can also be found in this application note. Dc motor to control the motor we are using 12 volt dc motor to provide free motion with load. In this experiment, you will drive the dc motor using the analog voltage output from your daq board. In this example there are three electromagnetic circuits connected at a common point. To construct an hbridge using 6 enhancement mosfets. Speed control of a dc motor is either done manually by the operator or by means of an automatic control device. The torque of dc servo motor decreases with increase in speed. This method is used where a fixed voltage is available. An857 ds00857apage 2 2002 microchip technology inc. With the transistors that are used by the library, when flat side of the transistor facing you the left leg is the emitter, the middle leg is the base. Load test on three phase squirrel cage induction motor 9. The purpose of this experiment is to design and implement a closeloop speed control of a dcmotor drive.
This version of internet explorer is either no longer supported by microsoft, or is obsolete and. Motors and control methods dc motor control forward, reverse, stop control by manual switch control by relay control by transistor control by hbridge control by motor driver dc stepper motor control bipolar stepper motor control driver unipolar stepper motor control driver. Control motor speed with a computer algorithm microcontroller 12 vdc motor ac. System modeling the dc motor is driven by a voltage. In turn the motion of the lever arm is controlled by the dc brush motor through gear.
To study the speed control of the given dc shunt motor by field control method and armature control method. A common actuator in control systems is the dc motor. Pdf experiment 3 lab manual american international. Qnet dc motor control laboratory manual ee labs home. Using matlab for control systems cise 302 lab manual page 2 table of contents lab experiment 1. To use an arduino microcontroller to control the qdrive and inverted qdrive. Apply 30v to the armature and measure the noload speed. Speed control of dc shunt motor and 3ph induction motor. The 990mc1 builds both knowledge and skills across topics like manual motor control, control ladder logic, motor starters, and automatic input devices.
Modeling of dc motor the most common device used as an actuator in mechanical control is the dc motor. In this experiment the simple rectifier supply, used in experiment 2. Electrical machines lab 1 griet eee 6 control the speed of a motor. To control the speed of dc shunt motor using armature control method. It is mainly used in signal processing, communication theory, and control theory. At first, the controllers will be designed and tested on a simulation model of the dcmotor. Make sure to plug the following components in correctly. The quanser dc servomotor in the control systems laboratory has the following model with.
This innovative approach to bringing motor control training to wherever you need is one example of why amatrol is the worlds leader in skillsbased, interactive technical learning. The 930 square foot laboratory contains advanced movement analysis equipment as well as ample open space required for movement studies. Motors and control methods dc motor control forward, reverse, stop control by manual switch control by relay control by transistor control by hbridge control by motor driver dc stepper motor control bipolar stepper motor control driver. We shall use the same dcmotor for which the parameters were calculated in the previous experiment. C motor can be controlled by varying either the field current o the armature current. Write a transfer function for a dc motor that relates input voltage to shaft position. Tt 0, the transfer function from the applied voltage v a t to the motor speed m t can be simplified as a first order system. The term project develops a speed control system for a direct current dc motor. Dc motor principle a machine that converts dc power into mechanical energy is known as dc motor. The purpose of this experiment is to design and implement a closeloop speed control of a dc motor drive. The motor control laboratory is located in the des moines university clinic building. Et 438a automatic control systems technology 1 learning objectives 2 x after this presentation you will be able to.
The operation of this type of device dc motor is reversible if the load opposes the rotation movement the load is said to be resistive, the device provides a torque and operates as a motor if the load is such that it tends to make the device rotate the load is said to be driving or it opposes the slowdown. Dc motor speed control in matlab the engineering projects. Power electronics lab manual vii sem ec set r1 and r2 to mid position and v1 and v2 to minimum. To use this hbridge to control a motor using a qdrive and an inverted qdrive. The system for the speedcontrol of a dc motor is shown in fig 1.
The electric equivalent circuit of the armature and the freebody diagram of the rotor are shown in the following figure. The requirement of feeding back phasecurrent and speed of the motor will be studied in experiment4. Write the transfer function for an armature controlled dc motor. The motor housing is supported along its axis by ball bearings. The successive sections explain the implementation of code drivers using the mpc5604b mcu. Dc motor with speed and current closed loops, driven by etpu on mcf523x, rev. Our primary research goals are to determine age and diseaserelated chang. Set the gate current ig ig1 such that forward break over voltage is between 15 to 20 v, by varying r2 and v2. Pmdc motor modeling, identification, speed control 19. The principle behind the motor is based on electromagnetism which converts electrical energy into mechanical energy 1. Dc motor speed control in labview the engineering projects. Apply 40v to the field using the lab dc power supply.
The standby pin is connected to voltage through a 10kilohm resistor. In this method, speed control is possible from rated speed to low speeds. Experiment 3 lab manual american international university title. The category of dc motor that is the least expensive, easiest to use, and thus the most popular, is the sub. The motor control laboratory des moines university.
The dc motor under investigation is mounted in a special cradle to permit measurements of the output torque. Dc motors although ac motors are used in most of the cases, dc motors have many applications and used for multipurpose applications. Here, in this tutorial i will explain about how can make a program for dc motor speed control in matlab by creating a gui having different buttons on it to control the direction of rotation of the dc motor as well as the speed of the dc motor by sending different commands through the serial port. Tt load applied on the motor shaft of the motor such as coulomb friction, weight lifted by the motor so for a motor with zero load i. For example, the control of a rotary inverted pendulum requires a dc motor to drive the arm and the pendulum as shown in figure 21. The motor drivers vcc pin is connected to the arduinos voltage output 5v or 3. You will be able to switch the motor on and off, and control its direction. In the tutorial dc motor speed control in labview, i will explain you a complete step by step procedure to control the clockwise and counter clockwise direction of the dc motor as well as accelerating and deacelerating it with the help of the buttons on the gui created in ni labview using serial communication between arduino and ni labview. Represent a mechanical load using a mathematical model. Laboratory 4 open loop analog control of a dc motor.
Introduction direct current dc motors comprise one of the most common types of actuator designed into electro. This example shows two dc motor control techniques for reducing the sensitivity of w to load variations changes in the torque opposed by the motor load. Experiment 5 dc motor speed control walter scott, jr. Dc motor with speed and current closed loops, driven by.
Before the lab begins, students are required to read and understand the control system laboratory manual for the hardware and software description. In addition, it is recommended that the students complete the following pre lab work. Rs pro by allied dc motor controller potentiometer control 110 vac 240 vac 1. It directly provides rotary motion and, coupled with wheels or drums and cables, can provide translational motion. What is the relation between torque and speed of dc servo motor. The exact design and materials vary with each type of motor and depend on the application and constraints, but several elements are common to most. The open loop analog motor control system is shown in figure 4. To control the speed of dc shunt motor using field control method. Dc drives and dc motor drives from automationdirect, the best value in industrial automation low prices, fast shipping, and free awardwinning service. The feedback voltage signal can be obtained as depicted in appendix a. Speed control is achieved by adding an external resistance in the armature circuit. Pulsewidth modulation, pi control, pole placement, steadystate error, disturbance rejection, saturation, integrator windup, embedded control. In this activity we will design and implement a speed controller for a simple dc motor.
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