Science fair projects with dc motor school science. Torque exerted by the motor, when a multiple segments commutator is used. Some of the dc motor project ideas are electric lift, electric bell, dc motor powered car, chaff machine, home made fan, electric break, etc. Experiment dc machine dc motors and generators 1800rpm objective. This lab allowed us to further investigate the characteristics of the various dc motor speed control schemes. The performance of the stepper motor is compared to the performance measured for the dc motor in previous labs. Title of the experiment page no 7 retardation test on dc shunt motor.
Electrical machines for mechatronics laboratory 7 2. Dc motor dc motor theory the dc motor has two basic parts. The speed response of dc motor is drawn for a bove circuit see fig. Discussion a dc motorgenerator can run either as a motor or as a generator. There are several types of these kits available as noted above, as well as some very simple ones. We send in a pulse width modulated signal from port t3 which will drive the motor. A 24 vdc generator actually just another groschopp dc motor is used as the mechanical load. One area of focus is preventing noise random instabilities in circuitry from affecting the control of high power motors. To examine the behavior of dc shunt and compound motors under load. The dc motor control experimental setup offers rich possibilities for learning the practical aspects of control systems design and implementation. If there are sparks, you may decrease the voltage a little. The purpose of this experiment is to design and implement a closeloop speed control of a dcmotor drive. We shall use the same dcmotor for which the parameters were calculated in the previous experiment. Its control pins allow us to do the equivalent of swapping over the motor terminals to.
Electric power free energy generator with dc motor 100%. We present here a set of simple experiments thro ugh which various. In experiment 3 and 4, the speed of the dc motor was controlled by using an openloop voltage control. There are two types of controls which were made in order to control the speed as well as the current. Varying its supply voltage can change the speed of a dc motor. 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.
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. You can make any school science experiment mentioned above and demo as your science fair projects. The flux in this machine is directly proportional to its armature current at least until the metal saturation. In an open loop control, the only components in the system. Pdf experiment setup for focused learning of advanced servo. The armature is made of coils of wire wrapped around the core, and the core has an extended shaft that rotates on bearings. An introductory electric motors and generators experiment for a. For this experiment, a reversible, permanent magnet, brushed dc motor is selected. The motor you created uses direct current, or dc, to rotate the armature. Brushed dc bdc motors are inexpensive, easy to drive, and are readily available in all sizes and shapes. The direct tests can be used only on small machines. Write experiment title, your name and student number at top of the page.
A constant voltage of 110v was maintained throught the experiment. This is video i want to show you about electric power free energy generator with dc motor 100% new experiment science project at home. Ee 448 laboratory experiment 4 introduction to dc motors 3 accidentally, there is a comp lete loss of the stator field. 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. Performance of dc motors experiment 2 linkedin slideshare. Electric energy can be converted into useful work, or mechanical energy, by machines called electric motors. 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. The arduino board together with the motor and attachments is called the minseg. Quanser has a dc motor control kit with a user manual that lists at least 67 experiments1. In this experiment the mechanical characteristics b and j will be determined. The method of testing to derive the equivalent circuit of a given design is demonstrated. Also studied are the performance and control characteristics of these configurations. Dc motor speed control using pid controller implementation.
The direction of the motor was checked and turn in clockwise direction. Armature controlled dc motor next, note that the angular speed. We shall use the same dc motor for which the parameters were calculated in the previous experiment. Using four rotors made out of four di erent materials would allow us to get very complete data. The above experiment aims to verify that a owing current indeed generates a vector eld b. We shall use the same dcmotor for which the parameters were calculated in. Related threads on resistance of dc motor experiment dc motors. The magnetic force is only able to flow in one direction, so the motor spins in only one direction. This eld may be thought of as the sum of in nite contributions db due to all. Dc motors have been known to fly apart under these over speed conditions. This is video i want to show you about electric power free energy generator with dc motor 100% new experiment science project at. Model 1 the student sees one experimental setup in each experiment e. Experimental friction identification of a dc motor. Armature controlled dcmotor next, note that the angular speed.
System analysis page where the systems openloop response is simulated. In this lab experiment, the dc motor speed control was studied. The rst major design decision was to build a motor that would facilitate our experiment as e ectively as possible. Dc motor speed control using pid controller implementation by.
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. Operating switch on position m constt constswitch torque range position 10 nmswitch speed range position 6000table 2. By varying the pulse width duty cycle, we are able to create variable speed motor. 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 motor research is being used to develop systems which can accurately control the movement such motors. Dc motor, motor constant, mo tor speed control, speedtorque curve, startstop dynamics. Dc motor is directly proportional to the voltage applied across its windings.
Since the most basic requirement of a motor is that it should rotate at the desired speed, we will require that. Brushed dc motor fundamentals microchip technology. Dc machines are most commonly used in control and servomechanism, as well as industrial, applications. The term reversible means the rotation of the motor can be reversed by simply flipping the terminals of the dc power supply. The motor we experiment with is a simple dc motor with a wheel and an arm attached. Another name for a coil or loop of wire inductors oppose the change in current.
Dc motor voltagetospeed transfer function estimation by stepresponse and frequencyresponse. 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. The dierential equation relating the armature current ia and the back e. Do not run your motor for more than a minute continuously. It works very well, and is a great demonstrator of a dc motor or a dc generator. Electric power free energy generator with dc motor 100% new. The physics of the dc motor example a linear dc machine 19 consider the simple linear dc machine in figure 1. The objective of this lab is to develop and test a closedloop control algorithm for a stepper motor. This gives us a clue as to how the l293d chip works.
Electric motors work due to electromagnetic interactions. Experiment 7 series dc motor i objectives to determine the torquespeed characteristic curve. 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. This is my version of what others call the worlds simplest motor. How to make a simple electric motor science project. To obtain the armature voltage vs armature current load curve of the generator.
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. 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. Introduction a series dc motor is a motor whose filed windings consists of a relatively few turns connected in. Note that the scope measures the voltage applied to the base of the power transistor as shown in figure l8.
Flux produced by the shunt field per pole i a armature current the torque developed in the motor is opposed by the torques due to a friction and windage b eddy currents and hysteresis and c mechanical load connected at the shaft. 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. First consider that our uncompensated motor rotates at 0. Science fair projects with dc motor school science experiments. The circuit diagram of dc motor speed control based pid controller is shown in figure 4. To obtain the performance characteristics of a dc shunt motor by load test. Ac, or alternating current, uses the same principle of electron flow, but the pole is rotating rather than in one place.
The model of output voltage control of the switchmode dc converter was discussed in experiment. Induced voltage opposes applied voltage and limits current. What is common to all the members of this family is that the basic. To study the methods of controlling the speed of separately excited dc motor. Whence, computing the derivative in equation 12, the back electromotive. The student designs a controller for the given system based on a mathematical model that was provided by the control systems manufacturer, viii. Testing of dc motor, dc motor testing direct and indirect. This experiment explores all the possible design connections of a dc machine. The armature, carrying current provided by the battery, is an electromagnet, because a currentcarrying wire generates a magnetic field. However, your dc motor has been carefully designed to withstan d possible over speed conditions. Have these ready to be checked by lab staff at the door on the day of your lab. Its operation is based on the principle that when a current carrying conductor is placed in a. A dc generator is used to provide a dynamic, variable load on the shaft of the dc motor in the dynamometer cradle.
In experiment3 and 4, the speed of the dcmotor was controlled by using an openloop voltage control. A schematic representation of an armature controlled dcmotor is given in figure 1. The principle of experimental friction identification results from first newton. Ee 448 laboratory experiment 4 introduction to dc motors 2 i. 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. Set the derivative of 3 equal to zero to determine the location of the extremum. Dcmotors that are used in feedback controlled devices are called dc servomotors 14.
Conclusion in this lab experiment the dc motor speed control. 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. Experiment 5 dc motor speed control walter scott, jr. Vb to the armature voltage va canbeobtainedbyapplyingkirchhos voltage law 1,4.
Principles of operation the construction of a simple bdc motor is shown in figure 1. Pdf remote laboratories are normally developed for giving students and others remote access to physical laboratory. A permanent magnet dc motor can easily be characterized. Therefore, the flux in the machine can be given by. To study the properties of the separatelyexcited dc shunt generator under noload and fullload conditions 2. Sep 30, 2012 operating switch on position m constt constswitch torque range position 10 nmswitch speed range position 6000table 2.
1511 121 1097 459 764 32 285 175 1436 1262 965 1413 408 652 1543 681 1112 1287 785 1204 347 28 417 259 693 811 766 928 209 1279 252 906 1255 390 577 833 244 897 564 378 601 372 139 363 1460 135 331 44 658 922