Dc motor experiment pdf

The student designs a controller for the given system based on a mathematical model that was provided by the control systems manufacturer, viii. Dc motors although ac motors are used in most of the cases, dc motors have many applications and used for multipurpose applications. Dc motor dc motor theory the dc motor has two basic parts. To obtain the performance characteristics of a dc shunt motor by load test. Introduction a series dc motor is a motor whose filed windings consists of a relatively few turns connected in series with the armature circuit.

Dc motors have been known to fly apart under these over speed conditions. Dcmotors that are used in feedback controlled devices are called dc servomotors 14. Torque exerted by the motor, when a multiple segments commutator is used. A permanent magnet dc motor can easily be characterized. How to make a simple electric motor science project. Experiment 5 dc motor speed control walter scott, jr. The magnetic force is only able to flow in one direction, so the motor spins in only one direction. There are two types of controls which were made in order to control the speed as well as the current. Pdf remote laboratories are normally developed for giving students and others remote access to physical laboratory. Electric motors work due to electromagnetic interactions. Motor property 1 torque is proportional to current question. Its operation is based on the principle that when a current carrying conductor is placed in a. For the direction control of dc motor the functionality remains the same as it was in dc motor direction control with arduino in proteus but for the speed control, i have placed an light dependent resistor ldr sensor in the simulation and depending on the value of the ldr sensor the speed dc motor will either increase or decrease. One area of focus is preventing noise random instabilities in circuitry from affecting the control of high power motors.

To obtain the armature voltage vs armature current load curve of the generator. Principles of operation the construction of a simple bdc motor is shown in figure 1. You can make any school science experiment mentioned above and demo as your science fair projects. Brushed dc bdc motors are inexpensive, easy to drive, and are readily available in all sizes and shapes. The motor we experiment with is a simple dc motor with a wheel and an arm attached. Its control pins allow us to do the equivalent of swapping over the motor terminals to. System analysis page where the systems openloop response is simulated. This is video i want to show you about electric power free energy generator with dc motor 100% new experiment science project at. The armature, carrying current provided by the battery, is an electromagnet, because a currentcarrying wire generates a magnetic field. The objective of this lab is to develop and test a closedloop control algorithm for a stepper motor. Set the derivative of 3 equal to zero to determine the location of the extremum. Also studied are the performance and control characteristics of these configurations. Feb 10, 2017 electric generator using dc motor is a simple science project for school students who are interested in science experiments which can be done at home are classroom or any were. Electric power free energy generator with dc motor 100%.

Vb to the armature voltage va canbeobtainedbyapplyingkirchhos voltage law 1,4. To find out how to reverse the direction of rotation of a series dc motor. We present here a set of simple experiments thro ugh which various. The dc motor control experimental setup offers rich possibilities for learning the practical aspects of control systems design and implementation.

Electric power free energy generator with dc motor 100% new. Testing of dc motor, dc motor testing direct and indirect. The purpose of this experiment is to design and implement a closeloop speed control of a dc motor drive. Another name for a coil or loop of wire inductors oppose the change in current.

Armature controlled dcmotor next, note that the angular speed. Conclusion in this lab experiment the dc motor speed control. This is video i want to show you about electric power free energy generator with dc motor 100% new experiment science project at home. In this experiment the mechanical characteristics b and j will be determined. The above experiment aims to verify that a owing current indeed generates a vector eld b. The performance of the stepper motor is compared to the performance measured for the dc motor in previous labs. Dc motor principle a machine that converts dc power into mechanical energy is known as dc motor.

Ee 448 laboratory experiment 4 introduction to dc motors 2 i. Ac, or alternating current, uses the same principle of electron flow, but the pole is rotating rather than in one place. This eld may be thought of as the sum of in nite contributions db due to all. Dc motor research is being used to develop systems which can accurately control the movement such motors. Science fair projects with dc motor school science.

We shall use the same dcmotor for which the parameters were calculated in. A dc generator is used to provide a dynamic, variable load on the shaft of the dc motor in the dynamometer cradle. Armature controlled dc motor next, note that the angular speed. Electric energy can be converted into useful work, or mechanical energy, by machines called electric motors. Performance of dc motors experiment 2 linkedin slideshare. What is common to all the members of this family is that the basic. An introductory electric motors and generators experiment for a. Experiment dc machine dc motors and generators 1800rpm objective. Induced voltage opposes applied voltage and limits current. Whence, computing the derivative in equation 12, the back electromotive. However, your dc motor has been carefully designed to withstan d possible over speed conditions. If there are sparks, you may decrease the voltage a little. For this experiment, a reversible, permanent magnet, brushed dc motor is selected. Note that the scope measures the voltage applied to the base of the power transistor as shown in figure l8.

The armature is made of coils of wire wrapped around the core, and the core has an extended shaft that rotates on bearings. Experimental friction identification of a dc motor. In this lab experiment, the dc motor speed control was studied. Other members of the family are the direct current dc motor or generator, the induction motor or generator, and a number of derivatives of all these three.

We send in a pulse width modulated signal from port t3 which will drive the motor. To study the properties of the separatelyexcited dc shunt generator under noload and fullload conditions 2. To examine the behavior of dc shunt and compound motors under load. The principle of experimental friction identification results from first newton. E x p e r i m e n t 3 characterization of dc motor. The term reversible means the rotation of the motor can be reversed by simply flipping the terminals of the dc power supply. The circuit diagram of dc motor speed control based pid controller is shown in figure 4. Have these ready to be checked by lab staff at the door on the day of your lab. The motor is normally part of a lego mindstorms kit. Dc motor, motor constant, mo tor speed control, speedtorque curve, startstop dynamics. Therefore, the flux in the machine can be given by. The purpose of this experiment is to design and implement a closeloop speed control of a dcmotor drive.

To study the methods of controlling the speed of separately excited dc motor. Conclusion in this lab experiment the dc motor speed. Brushed dc motor fundamentals microchip technology. Science fair projects with dc motor school science experiments.

In direct method of testing the generator or motor is put on full load and whole of the power developed by it is wasted. Dc motor speed control using pid controller implementation. The motor you created uses direct current, or dc, to rotate the armature. This lab allowed us to further investigate the characteristics of the various dc motor speed control schemes. It works very well, and is a great demonstrator of a dc motor or a dc generator.

Introduction a series dc motor is a motor whose filed windings consists of a relatively few turns connected in. This experiment explores all the possible design connections of a dc machine. Experiment 7 series dc motor i objectives to determine the torquespeed characteristic curve. This is my version of what others call the worlds simplest motor. Electrical machines for mechatronics laboratory 7 2. The dierential equation relating the armature current ia and the back e. Dc motor is directly proportional to the voltage applied across its windings. The flux in this machine is directly proportional to its armature current at least until the metal saturation. An experiment before we get the arduino board to control the motor, we should experiment with the l293d motor control chip to get an idea how it works. The motor features a permanent horseshoe magnet called the stator because its fixed in place and an turning coil of wire called an armature or rotor, because it rotates. There are several types of these kits available as noted above, as well as some very simple ones. The direct tests can be used only on small machines.

Do not run your motor for more than a minute continuously. Discussion a dc motor generator can run either as a motor or as a generator. The motor we experiment with is a simple dcmotor with a wheel and an arm attached. Electric generator using dc motor is a simple science project for school students who are interested in science experiments which can be done at home are classroom or any were. The direction of the motor was checked and turn in clockwise direction. Using four rotors made out of four di erent materials would allow us to get very complete data. Introduction the purpose of this experiment is to examine the construction of a dc motorgenerator, to learn the basic motor wiring connections, and to study the performance characteristics of a shunt and series dc motor. In experiment 3 and 4, the speed of the dc motor was controlled by using an openloop voltage control.

By varying the pulse width duty cycle, we are able to create variable speed motor. In experiment3 and 4, the speed of the dcmotor was controlled by using an openloop voltage control. Quanser has a dc motor control kit with a user manual that lists at least 67 experiments1. The dc motor is an attractive piece of equipment in many industrial applications requiring variable speed and load characteristics due to its ease of controllability. A constant voltage of 110v was maintained throught the experiment.

Dc motor speed control using pid controller implementation by. The model of output voltage control of the switchmode dc converter was discussed in experiment. A schematic representation of an armature controlled dcmotor is given in figure 1. Sep 30, 2012 operating switch on position m constt constswitch torque range position 10 nmswitch speed range position 6000table 2. The arduino board together with the motor and attachments is called the minseg. Dc machines are most commonly used in control and servomechanism, as well as industrial, applications. Dc motor voltagetospeed transfer function estimation by stepresponse and frequencyresponse. The method of testing to derive the equivalent circuit of a given design is demonstrated. Model 1 the student sees one experimental setup in each experiment e. An external magnetic field is going through the loop of the circuit up out of the page indicated by the 0 in the plane of the loop. Operating switch on position m constt constswitch torque range position 10 nmswitch speed range position 6000table 2. Write experiment title, your name and student number at top of the page.

Varying its supply voltage can change the speed of a dc motor. Maksimovic the purpose of this experiment is to become familiar with operating principles, equivalent circuit models, and basic characteristics of a dc machine. May 24, 2017 for the direction control of dc motor the functionality remains the same as it was in dc motor direction control with arduino in proteus but for the speed control, i have placed an light dependent resistor ldr sensor in the simulation and depending on the value of the ldr sensor the speed dc motor will either increase or decrease. The rst major design decision was to build a motor that would facilitate our experiment as e ectively as possible. Title of the experiment page no 7 retardation test on dc shunt motor. In an open loop control, the only components in the system. Related threads on resistance of dc motor experiment dc motors.

In this particular case, notice that the ux owing in the coil is given by equation 3 substituting with the angle t of the motor and a with the area of the internal surface of the coil. The physics of the dc motor example a linear dc machine 19 consider the simple linear dc machine in figure 1. November 4, 2016 1 of 21 experiment dc machine dc motors and generators 1800rpm objective this experiment explores all the possible design connections of a dc machine. We shall use the same dc motor for which the parameters were calculated in the previous experiment. Pdf experiment setup for focused learning of advanced servo.

First consider that our uncompensated motor rotates at 0. We shall use the same dcmotor for which the parameters were calculated in the previous experiment. Introduction the purpose of this experiment is to examine the construction of a dc motor generator, to learn the basic motor wiring connections, and to study the performance characteristics of a shunt and series dc motor. Ee 448 laboratory experiment 4 introduction to dc motors 3 accidentally, there is a comp lete loss of the stator field. Since the most basic requirement of a motor is that it should rotate at the desired speed, we will require that. Some of the dc motor project ideas are electric lift, electric bell, dc motor powered car, chaff machine, home made fan, electric break, etc. A 24 vdc generator actually just another groschopp dc motor is used as the mechanical load.