Dc Motor Experiment

Ask for Price. Components - 1 * Small-sized DC motor. The additional machine helps to supply the friction and Windage losses, under this conditions, the slip s=0 and the current drawn by the induction motor is I o only since s=0, the term R L =R 2 {(1/s)-1)} becomes the load resistance R L =0. Lab Experiment for Transfer Function of Dc Servo Motor Online Retail store for Trainer Kits,Lab equipment's,Electronic components,Sensors and open source hardware. " Wouldn't it be cool if kids could also make an electric generator that simple? But it should be possible with parts from a Radio Shack store, since Radio Shack had the special light bulb as well as magnets and spools of. Speed control involves developing a controller that will influence the DC motor such that it spins at a desired speed. Energy comes in many forms. Several feet of wire Empty spool of thread. DC motor Specification: 220V, 2. A proportional-derivative controller is used to achieve set-point tracking. The DC motor in your Arduino kit is the most basic of electric motors and is used in all types of hobby electronics. Around 1994 I was thinking about the ultra-simple electric motor which later became known on internet as the "Beakman Motor. German Inventor solves permanent magnet motor puzzle - wants to 'give away' the discovery Thomas Engel is a successful German inventor with more than a hundred patented inventions to his credit. 2 Synchronous Generator Objective The objectives of this experiment are to learn to synchronize a synchronous generator to a large stable system and to demonstrate the operating characteristics of a synchronous generator when delivering power to a large stable system. As such, its performance is a blend of the two types. Use this motor for 1. The aim of the experiments with a low-power dc motor is to show how the motor approaches its steady rotation and how its torque, mechanical power and efficiency depend on the. Remember to scrape the enamel (insulation) from the both coil ends from the same side!. 3 Lab 3: DC Motor Transfer Function Estimation by Explicit Measurement. Powerpoint has annotated answers to the worksheet questions. Note: LED anode has longer lead and should be connected to "+". In experiment-3 and 4, the speed of the DC-motor was controlled by using an open-loop voltage control. In today's industrial sector, direct current (DC) motors are everywhere. the speed = torque represents represents electrical characteristics of the dc motor. supply using SCRs. View Notes - Speed-control-of-dc-shunt-motor from BOSTON 6. They also drive many other types of. Use this motor for 1. 2 DC Motor Experiments. Build a simple DC motor. Remember to scrape the enamel (insulation) from the both coil ends from the same side!. When the two ends of the coil are connected across a DC voltage source, current I flows through it. We saw above that a DC motor is also a DC generator. com: CrocSee Micro 3 Phase AC Mini Hand Brushless Motor Generator Model Experiment Teaching Aid: Toys & Games Skip to main content Mini DC Motor, DROK. The prototype operates with speed controlled for use in the 0–10,000 rpm range. I learned that in order for the wire to spin the insulation has to be sanded off. ω − = (12) Where. In this tutorial, I am going to work on the program for DC Motor speed Control using NI LabVIEW. When the two ends of the coil are connected across a DC voltage source, current I flows through it. Some motors start at 20% DC, maybe 25% or even 35% But the matter of fact is that no DC motor starts rotating at 1% DC. The above experiment aims to verify that a be zero (this is the case of a DC motor), with reference to the quantity of charge dq found. range from small permanent-magnet dc motors at a fraction of a Watt in consumer electronics, to large industrial shunt dc machines having a separate field winding. Find out how to make a simple electric motor. You may find that changing position of the reed switch or other sensor can change the direction of rotation. Every element is located and. Regulation of an alternator by EMF & MMF methods. Lab 8 - DC Motors Lab 8-4 Figure L8-4. 2 test tables 2. It should range from 500 Ω down to about 30 Ω. When the coil is near a stronger magnet, the coil will move to align with the stronger magnet due to the magnetic force of the stronger magnet. The equation that relates motor load to measured current values is shown in Equation 4. 5-volt to 6-volt) and connecting wire. Motor 2/3 H. In this particular case we modeled a DC motor. The module I need will monitor one or two 0-5VDC inputs and output a PWM. The dc motor is driven by a linear. com: Topoox 6 Pack DC 1. The generator motor is a DC motor and generates DC power. Motor Adjustable Power Source. Shunt motor by(i) Field. In most common DC motors (and all that BEAMers will see), the external magnetic field is produced by high-strength permanent magnets 1. DC Motor Reversing Before we get the Arduino board to control the motor, we should experiment with the L293D motor control chip to get. characteristics and behaviour of a DC servo motor. Background Theory: How Does a DC Motor Work?. So how do they work? With this activity, you will build your own simple DC motor. Starting of DC Motors. The mathematical model of a DC motor is reviewed and its physical parameters, as in the speed control experiment, are identified. Find out how to make a simple electric motor. We will spend the last half hour of the lab for project discussion. " Http://www. The cool video clips show what happens to marshmallows in a vacuum, how to suck an egg into a bottle, an amazing tea bag rocket in action, how to test how much sugar is in soda and more. synchronous motor (studied earlier) to drive the IM at w s. Then, use those to compute the overall transfer function (Lab 3). 5 H System equations. Introduction. In this experiment we will generate a model for an armature-controlled DC motor based on its step response. 2:stepper motor control 3:servo motor control. Date Name : Student ID: UEEA2433: Electrical Machines Lab-1. 1 Introduction In today's high technology world, the electrical engineer is faced with the design and analysis of an increasingly wide variety of circuits and systems. In this paper we present the scheme to construct an easy to operate and low cost programmable spin coater based on the brushless dc motor of hard disk drivers (HDDs). Lathe Modification: Variable Speed Treadmill DC Motor. The system illustrated in Fig. Motors come in various sizes. How does this affect overall motor performance? At an elevated motor temperature, the slope of the DC motor curve increases as a result of an increase in no-load speed and a decrease in locked rotor torque (sometimes referred to as stall torque). A Novel Web-Based Laboratory for DC Motor Experiments ILHAMI COLAK, SEVKI DEMIRBAS, SEREF SAGIROGLU, ERDAL IRMAK Gazi Electrical Machines and Energy Control (GEMEC) Group, Technical Education Faculty Electrical Education Department, Gazi University, 06500 Besevler/Ankara, Turkey Received 2 June 2008; accepted 27 October 2008 ABSTRACT: This article introduces a novel web-based DC motor. In this article, you will learn what makes electric motors tick. Generators. Equipment The equipment required for the experiment are:. ALLInterview. LAB #8: SPEED CONTROL OF A DC MOTOR - MOTOR DRIVE. DC COMPOUND MOTOR. In clockwise mode, the motor rotates in the direction. com FREE DELIVERY possible on eligible purchases. Build a simple DC motor using an electromagnet. How to Make a Simple Motor: Here is a fun way to explore the inner workings of a simple motor. characteristics and behaviour of a DC servo motor. In particular, we will ¯rst develop the governing di®erential. For an armature controlled DC-motor, the ¯eld current if is constant and the torque Tm generated at the DC-motor shaft is given by [2{4] Tm = KTia; (2. In this project DC motor's speed is controlled by sending the command through PC. Motor efficiency: 50. To understand the performance such as torque, speed, current and efficiency of dc. Making your own Motor is an excellent introduction into the world of technology. It is just made up of simple motor which run through servo mechanism. 5-volt to 6-volt) and connecting wire. Hence the armature current differs and the speed of a DC Shunt motor will continue constant which is shown in the fig (dotted Line AB). Project Owner Contributor PID control of a DC motor speed. It can be done in an afternoon or less, and costs almost nothing (the materials are things that are on the edge of being garbage or not garba. Tutorial group. Experiment 7 Series DC Motor (I) 0405344: Electrical Machines for Mechatronics Laboratory 7 – 4 Speed Control of Series DC Motors Unlike with the shunt dc motor, there is only one efficient way to change the speed a series dc motor. INDUCTION MOTOR AND DIFFERENT SPEED CONTROL METHODS 3. Similarly, an alternator is also an AC motor. In this experiment, we will examine some key characteristics of a DC motor. While the principles behind electric current and magnetic fields interacting can be a bit technical, building a basic engine is easy. An example is Michael Faraday's homopolar motor, and the ball bearing motor. Your bench will be already set up for you with three machines coupled mechanically: On the left will be the IM, in the center the DC Dynamometer and on the right the SM. The motor effect is the term used when a current-carrying wire in the presence of a magnetic field experiences a force. A longer-life motor with an improved design of commutator. of thermal behaviour between healthy DC motor and commutator fault DC motor, that can clearly recognize the commutator fault by through the different of characteristic temperature profile of DC motor. Electric energy can be converted into useful work, or mechanical energy, by machines called electric motors. In the next section friction of the DC motor will be identified and subsequently DC motor mathematical model can be simulated and compared with real DC motor behavior. As such, its performance is a blend of the two types. com offers 1,247 dc motor experiment products. Let's take a closer look at step-pers and learn how to apply them to your robot designs. Watch a range of fun science experiment videos that show just how exciting science can be. Sk etch and describe the magnetic Þelds in this motor at different points during the rotation. A SCR controlled circuit has been built to con. of the base current IB. 4 Experiment 3: DC to DC Converters 4. The value of IB is controlled by the input circuit (which is RB and VBB in the CE configuration shown in Fig. Measure all the physical parameters of the system used to derive the equations. THEORY : The load test on induction motor is performed to compute its complete performance i. The identification is performed using the transient response analysis of the mechanical and electrical subsystems of a series DC motor. (1) Time response experiment. Detailed formulas for the relevant variables are also displayed. The stator is free to turn; however, its motion is restricted by a spring. Inside an electric motor, these attracting and repelling forces create rotational motion. Electric motors are used to power hundreds of devices we use in everyday life. One question that used to be in many formal exams was, If a DC shunt wound motor is running and the power to the field is removed, What occurs? 1/ The motor slows and stops. 1 is self exciting. 5 VOLT pre-mounted and wired on to one panel SOLAR SCIENCE FAIR PROJECT - Terrific for STEM and STEAM curriculum and the study of Alternative Energy options. : ----- Load test on DC shunt motor Objectives. OPEN LOOP CONTROL FOR A SIMPLE DC MOTOR Pablo A. What is the difference between a stepper motor and a servo motor? Inside a stepper motor there are coils and it's necessary to apply a series of pulses to them for the motor to rotate a certain number of steps; This is why it has so many wires coming out of it (usually 5 to 6 wires). Several feet of wire Empty spool of thread. 2-1 DC Machines Objectives: The objectives of this experiment are to investigate the operation of dc generator under load, determine the characteristic Kaφ, the resistances rA (total resistance rA= ra + rb, where ra is the armature resistance and rb is the total brush resistance), rF (field winding resistance), rb (brush. Keywords: FPGA, DPLL, DC motor, Speed controller, PWM generator, Phase frequency detector. EE443L Lab 3: Open Versus Closed Loop Motor Speed Control Introduction: The concepts of open loop and closed loop control are introduced in this laboratory for the objective of DC motor speed control. UXCELL 2pcs DC 3-6V Micro-Step Stepping Stepper Motor Screw 2 Phase 4 Wire for DIY Small Slipway Laser Engraving Machine Toys 5. Ø To be able to interpret its characteristics based on the data obtained through the experiment. The DC motor is driven by a voltage through a power amplifier. To avoid short circuit, two electric brush never touch the commutator. The idea of a speed control system is to maintain the speed of the motor at the desired value under various condition. Water Hydro Generator | Heating Process Principle Science | Physical Experiment. In today's industrial sector, direct current (DC) motors are everywhere. At normal condition the back EMF E b and Flux Φ both are constant in a DC Shunt motor. DC Motors and Generators DC motor Fall15 Revised: 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. …This integrated circuit allows the GPIO…to control a. Experiment Module 2 Electric Motors Objective/Introduction A coil of wire with a current produces a magnetic field. 2 Three Phase Induction Motor (IM) The three-phase induction motors are also called as asynchronous motors, which are. The pot here is used to adjust the speed of motor. Small DC Motors DC Motors come in sizes from very small dc motors used in toys that run on as little as 1. 1 operates the motor at one of ten speeds, as selected by a keypad. This course starts with identification and control of DC motors on a prototyping platform. The motor should rotate smooth and even. Experiment : Load test on DC shunt motor. These applica-tions include ship propulsion, mine hoists and steel rolling mills. Multiple Choice on DC Motor / Page - 1 · 32. Electric motor and generator science fair projects and experiments: topics, ideas, resources, and sample projects. Experiment No. A brushed dc motor has four fundamental modes: clockwise mode, counter-clockwise mode, coast mode, and brake mode. c motor work 3)Investigate the factors that affects its speed of rotation 4)Suggest the type of appliances that a motor may be used. After the invention of the induction motor, alternating current (AC) machines largely replaced DC machines in most applications. The MD20A enables bidirectional control of one high-power brushed DC motor from 6V to 30V. supply using SCRs. Stepper motors aren't as easy to use as standard DC motors, however, and they're both harder to get and more expensive. This is to ensure that the construction of the DC motors is the same and to eliminate the friction factor that may result from different types of construction. Electric Motor Fleming's Fleming Flemings Left Hand Rule Magnetism Motion Lorentz Commutator Force Magnetic Field. In today's industrial sector, direct current (DC) motors are everywhere. The brushless DC (BLDC) motor is becoming increasingly popular in sectors such as automotive (particularly electric vehicles (EV)), HVAC, white goods and industrial because it does away with the mechanical commutator used in traditional motors, replacing it with an electronic device that improves. 2 test tables 2. brushee of the DC Motor/Generator are odjuated to the neutral 2. INDUCTION MOTOR AND DIFFERENT SPEED CONTROL METHODS 3. Experiment 7 Series DC Motor (I) 0405344: Electrical Machines for Mechatronics Laboratory 7 – 4 Speed Control of Series DC Motors Unlike with the shunt dc motor, there is only one efficient way to change the speed a series dc motor. Arduino Lesson 15. microcontrolleruser, Why do you want to use a ULN2003 for a DC motor when the L293D is perfectly suited for it? The ULN2003 is great for a Unipolar stepper motor where each coil is either on or off, but a bipolar stepper motor and a DC motor also need the current to flow in BOTH directions. 011827 MOTOR INERTIA Jm Motor rotor inertia can be measured by making an experiment. Its operation is based on the principle that when a current carrying conductor is placed in a. edu ABSTRACT This paper consists in the construction of a simple and low cost DC motor as well as the design and implementation of an open-loop control system circuit which. Permanent magnet DC motor model to DC electric motor, simple design easy to assemble and disassembled ideal for school scientific teaching project. Transfer Function of DC Motor and Generator. It has been shown earlier that the speed of a motor is given by the relation It is obvious that the speed can be controlled by varying (i) flux/pole, F (Flux Control) (ii) resistance Ra of armature circuit (Rheostatic Control) and (iii) applied voltage V (Voltage Con- trol). The block diagram representation of the positional control system is shown below. INDUCTION MOTOR AND DIFFERENT SPEED CONTROL METHODS 3. In the July — December semester of 2009, we introduced 4 new experiments involving control of DC motor. Find these and other hardware projects on Arduino Project Hub. the speed - armature current represents represents mechanical characteristics of the dc motor. 5 V) and the dependent variable is how fast the motor spins. 3/2018 Brown County Library Project 03 continued: Note: No code is needed for this project – you will manually move jumper wires to make the DC motor start, stop and move in the direction that you want. In this report, we have implemented a DC motor speed control system. Electrodynamometer is an electrical break, inwhich the breaking force can be varied electrically. When selecting a DC motor for an application, or when developing a powered prototype there are numerous calculations and formulas which must be considered to produce a well-functioning, sufficiently-powered, and safe device. Electric Motor. A DC motor's speed can be controlled over a wide range, using either a variable supply voltage or by changing the strength of current in its field windings. 5 A 1440 RPM with Drum Brake Loading Arrangement. In our next experiment we will use a dedicated motor controller. Only take care, that you change only the field or the rotary field. Connect the DC-Shunt motor as shown in. 5-volt to 6-volt) and connecting wire. Energy comes in many forms. To study the properties of the separately-excited dc shunt generator under no-load and full-load conditions 2. PROCEDURE: 1. To find out G o and B o the induction motor is made to run at synchronous speed by using another machine. Figure 1: DC Motor Speed Control System The speed control of a motor is frequently required in industrial applications, robotics, home appliances, etc. DC COMPOUND MOTOR. DC Motor Reversing Before we get the Arduino board to control the motor, we should experiment with the L293D motor control chip to get. The LED is one way device. The identification is performed using the transient response analysis of the mechanical and electrical subsystems of a series DC motor. A proportional-derivative controller is used to achieve set-point tracking. We obtain the transfer function of the motor and identify specific parameters of the system that affect system response. A Novel Web-Based Laboratory for DC Motor Experiments ILHAMI COLAK, SEVKI DEMIRBAS, SEREF SAGIROGLU, ERDAL IRMAK Gazi Electrical Machines and Energy Control (GEMEC) Group, Technical Education Faculty Electrical Education Department, Gazi University, 06500 Besevler/Ankara, Turkey Received 2 June 2008; accepted 27 October 2008 ABSTRACT: This article introduces a novel web-based DC motor. These transistors have characteristics that are similar to the characteristics of the transistors used in the motor driver experiments. Analysing simple electric motors in the classr oom Q4. Experiment (2) DC Motor Control (Direction and Speed) Introduction Controlling direction and speed of DC motor is very essential in many applications like: 1- Robotic application - to change direction and speed of moving robot. A simple direct current (DC) motor is illustrated below. The independent variable is the battery charge (1. speed characteristic of a cumulative compound wound DC motor and calculate its efficiency. Great news! You're in the right place for dc motor experiment. Type: Motor Toy. com: CrocSee Micro 3 Phase AC Mini Hand Brushless Motor Generator Model Experiment Teaching Aid: Toys & Games Skip to main content Mini DC Motor, DROK. the DC-motor angular position response tracks a step command. Arduino Lesson 15. ) Back emf Now, as the first two animations show, DC motors and generators may be the same thing. A brushed dc motor has four fundamental modes: clockwise mode, counter-clockwise mode, coast mode, and brake mode. This Demonstration shows a series of rotation rates versus electromagnetic torque curves for separately powered DC motors. org Design and Simulation of Speed Control of DC Motor by. DC Motor Reversing Before we get the Arduino board to control the motor, we should experiment with the L293D motor control chip to get. If you are working on DC Motor then you should also have a look at DC Motor Direction Control using Arduino. To study the properties of the separately-excited dc shunt generator under no-load and full-load conditions 2. DC MOTORS Almost every mechanical movement that we see around us is accomplished by an electric motor. Find out how to make a simple electric motor. Our Solar Powered Motor physical dimension ranges from 3. Giggleway Electric Motor Robotic Science Kits, DIY STEM Toys for Kids, Building Science Experiment Kits for Boys and Girls-Doodling, Balance Car, Reptile Robot (3 Kits) $23. phase-current of DC motor) and encoder signal (speed of DC motor) is fed back to the DS1104 board via CP 1104. OPEN LOOP CONTROL FOR A SIMPLE DC MOTOR Pablo A. File name: Ph203_Lab6-DC Motor. The system illustrated in Fig. If you are working on DC Motor then you should also have a look at DC Motor Direction Control using Arduino. But like the UNL2003 it still require the Arduino to do all the motor sequencing. High torque DC electric motor with simultaneous battery charging system by Wilson A. motors characterized by the connections of field winding in They are Shunt Wound DC Motor Series Wound DC Motor Compound. Experiment DC Motor VS AC Motor. [2] DCMCT User Manual [3] QNET Experiment #01: DC Motor Speed Control 3. 5-3V 15000RPM Mini Electric Motor for DIY Toys, Science Experiments: Toys & Games. I also did this experiment i connected a electric drill chuck to conditions can explode etc), but first are you positive its a dc motor, oh wait i asume it. The LED is one way device. Interested in motor? Explore 90 projects tagged with 'motor'. Powerpoint has annotated answers to the worksheet questions. A DC motor will pull far more current than the Raspberry Pi can provide, and it's likely something will burn out. It has a low startup current (30 mA) and a max operating speed of 2180 RPM. For obvious practical and safety reasons, however, it focuses on DC motor projects only, and is best for ages 11–14. But like the UNL2003 it still require the Arduino to do all the motor sequencing. BACKGROUND. B coil B permB B perm B perm B coil maximum torque minimum torque circuit interrupted minimum torque no B coil B coil Q5. This is to ensure that the construction of the DC motors is the same and to eliminate the friction factor that may result from different types of construction. 937 DC brushed servo motor, one Arduino motor shield with encoder. Transfer Function of Dc Motor and Generator. G is a generator directly coupled to M 1. C Test on a single phase transformer 6. A DC motor can be modelled as before you run the experiment. In this block dialog you see the parameters that define the behavior of the motor: damping, inertia, back EMF, resistance and inductance. 0001 vsense2 8 0 dc 0v * * motor position fpos 0 11 vsense2 1 cpos 11 0 1 rpos. Power and Energy by Chris Woodford. One question that used to be in many formal exams was, If a DC shunt wound motor is running and the power to the field is removed, What occurs? 1/ The motor slows and stops. The mathematical model of a DC motor is reviewed and its physical parameters, as in the speed control experiment, are identified. We obtain the transfer function of the motor and identify specific parameters of the system that affect system response. Motor Power. Equipment: • solenoid • connection wires • analog galvanometer • 4-6 strong block • 2 bar magnets • 5V DC power supply (or battery) • a drinking straw. Amazing, isn't it? What you've built is called a homopolar motor, which uses direct current from the battery to power rotational movement. sciencebuddies. Apparatus 1. As a result, it is important to become familiarized with the physical characteristics of the motor. Family Charitable Foundations, 7 Sept. That is why this motor is really a simple DC motor. From robotics to automobiles, small and medium sized motoring applications often feature DC motors for their wide range of functionality. 3 Lab 3: DC Motor Transfer Function Estimation by Explicit Measurement. An electric motor contains two magnets; in this science project, you will use a permanent magnet (also called a fixed or static magnet) and a temporary magnet. At normal condition the back EMF E b and Flux Φ both are constant in a DC Shunt motor. We will spend the last half hour of the lab for project discussion. 5 V) and the dependent variable is how fast the motor spins. The DC motor is driven by a voltage through a power amplifier. C Test on a single phase transformer 6. In the next section friction of the DC motor will be identified and subsequently DC motor mathematical model can be simulated and compared with real DC motor behavior. Small DC motors find many uses in electronic devices and are a favorite component of engineers and hobbyists. Keywords: FPGA, DPLL, DC motor, Speed controller, PWM generator, Phase frequency detector. Components - 1 * Small-sized DC motor. About 4% of these are other electronic components, 1% are educational equipment, and 1% are other pcb & pcba. Determine effect on relative stability and steady-state accuracy as the gains as varied. A comparison of Eqs. We will discuss transfer function of armature controlled dc motor. The PWM output is here connected to power a DC motor through a NPN driving transistor. They are small in size but pack a big punch and are very energy-efficient. (9) and (17) indicates that the time constant of the system comprised of the motor and amplifier (τ), and the motor time constant (τm), are the same. How I can determine the parameters of a DC motor experimentally using speed vs input voltage? View. In this lesson, we will learn to how to use L293D to drive a DC motor and make it rotate clockwise and counterclockwise. is it OK to run any DC motor at an over. Experiment, simulation and results The principle of experimental friction identification results from first Newton´s law of motion. OK, this is. This experiment enables the students to explore set-point angular position control of a link driven by a DC motor. Recently, most servo systems are using brushless motors called "AC servo motor" to reduce maintanance cost. https://www. : Experimental Friction Identification of a DC Motor. Speed Torque Characteristic of Separately Excited DC Motor: The circuit equation of a Speed Torque Characteristic of Separately Excited DC Motor whose armature, having a total of Z con­ductors, is wound for 2P poles (the brushes divide the winding into 2a parallel paths), is. In our next experiment we will use a dedicated motor controller. Let's take a step back. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of rotation of a shaft. C Test on a single phase transformer 6. Performance of dc motors experiment 2 1. However, your DC motor has been carefully designed to withstan d possible over speed conditions. When angular velocity ω(t). But for the applications that require them, stepper motors can solve a lot of problems with a minimum of fuss. As you can see an L298N makes a great stepper motor controller as well as a DC motor controller. The generator motor is a DC motor and generates DC power. This is the kind that you’ll find inside essentially everything that moves (or shakes) and runs on batteries. 5 A 1440 RPM with Drum Brake Loading Arrangement. Highly efficient and compact, the control of the motor is achieved by a simple circuitry. One of the primary objectives of this experiment is. DO NOT run your motor for more than a minute continuously. What is the relation between torque and speed of DC servo motor? Ans. " Wouldn't it be cool if kids could also make an electric generator that simple? But it should be possible with parts from a Radio Shack store, since Radio Shack had the special light bulb as well as magnets and spools of. Alpha Decay: Atomic Interactions: Balancing Act: Balloons & Buoyancy: Balloons and Static Electricity: Band Structure: Battery-Resistor Circuit: Battery Voltage. To understand the performance such as torque, speed, current and efficiency of dc. AC, or alternating current, uses the same principle of electron flow, but the pole is rotating rather than in one place. World's Simplest DC Motor January 4, 2016 January 4, 2016 Coco Science dc motor , electromagnetism , homopolar motor Build a simple homopolar motor with a battery, a magnet and a strip of copper wire. We saw above that a DC motor is also a DC generator. Small DC motors are used in tools, toys, and appliances. Whatever dc electric motor styles you want, can be easily bought here. The universal motor can operate on direct current but is a lightweight brushed motor used for portable power tools and appliances. There are several types of these kits available as noted above, as well as some very simple ones. (9) and (17) indicates that the time constant of the system comprised of the motor and amplifier (τ), and the motor time constant (τm), are the same. Stepper motors aren't as easy to use as standard DC motors, however, and they're both harder to get and more expensive.