Ee3010 electricaldevicesand machines lectureno6 introduction to. Consider dc motor with no retarding torque or friction with constant voltage input, the steady state shaft speed. Construction and principle of operation of singlephase transformer, emf equation, singlephase autotransformer. Fall 2005 ee595s electric drive systems 3 voltsperhertz control. Dc machines 1 dc machines transformsmechanicalenergyintoelectric energywithdc voltage and currentdc generatoror dynamo, or converselydc motor. While control of the induction machine is considerably more complicated than its dc motor counterpart, with continual advancement of microelectronics, these control complexities have essentially been.
Suppose we have a 120v permanent magnet dc motor that is rated for 15a at 3600 rpm. Stepper motors stepper motor an electromagnetic actuator. Brush dc motor summary the magnetic field intensity is proportional to the current forced into the motor leads. State the term that applies to voltage variation from noload to fullload conditions and how it is expressed as a percentage. Dc motor propeller matching 3 mar 05 lab 5 lecture notes nomenclature t prop thrust q prop torque qm motor torque pshaft shaft power pelec electrical power ct thrust coe.
We have learnt in the previous lecture 37, that for motor operation. Motor control suppose we wish to use a microprocessor to control a motor or to control the load attached to the motor. Dc motor, generators and energy conversion devices lecture notes. Dcgenerator 2 lecture notes 2 electrical machine 1. Note for basic electrical engineering bee by gyana ranjan biswal lecture notes, notes, pdf free download, engineering notes, university notes, best pdf notes, semester, sem, year, for all, study material. The magnetic field rotation is automatically obtained commutating the active coil through mechanical switches brushes. The power loss due to the resistance of the armature b. Dcmotor lecture notes 4 electrical machine 1 enel3ma. Dc motor principle a machine that converts dc power into mechanical energy is known as dc motor. Download dc motor, generators and energy conversion devices lecture notes download free online book chm pdf. A good material for the poles of a pmdc motor should have the apposite of the above. Explain the effect of motor reaction in a dc generator. February 5, 2002 have been shown to be more than a match for dc drives in highperformance applications. A 230v,960b rpm and 200 amp separately excited dc motor has an armature resistance of 0.
Fall 2005 ee595s electric drive systems 2 overview of strategies voltsperhertz control constant slip control fieldoriented control. It consists of an electric motor motors, a transfer mechanism, an electrical energy converter, and a control system. Magnetic circuits quantities and definitions, solving magnetic circuits with electrical analogies, mechanics for motors and generators, electromagnetic induction and magnetic forces, construction of elementary dc generators, induced voltage in practical dc machines, power balance and. What is common to all the members of this family is that the basic. Motor control rss lecture 3 monday, 7 feb 2011 prof. Lecture notes electrical drives and traction veer surendra sai university of technology burla, odisha, india department of electrical engineering. Principles and working of dc and ac machines bits pilani. Ee2403 special electrical machines a course material on. Alwash lecture notes university of babylon electrical machines mechanical department fig. The rotor will constantly be turning to align its magnetic field with that of the stator field.
Et 332a dc motor, generators and energy conversion devices. It is an incremental drive digital actuator and is driven in fixed angular steps. Elements of electrical machines lecture notes for students on photo. Smart funded by the national science foun dation dc motor dc motors are simple twolead electrically controlled the voltage range of the dc motor is 1. Another name for a coil or loop of wire inductors oppose the change in current. Digital communication notes pdf dc lecture notes 4. Dc motor introduction, principle and working my tech info. Dc machines 1 dc machines transformsmechanicalenergyintoelectric energywithdc voltage and current dc generatoror dynamo, or conversely dc motor.
In a dc motor, the electric power is conducted directly to the armature through brushes and commutator. The rotor and stator windings are connected in parallel. Transforms mechanical energy into electric energy with dc voltage and current dc generator or dynamo, or conversely dc motor. Induced voltage opposes applied voltage and limits current. The rotor and stator are each connected from a different power supply, this gives another degree of freedom for controlling the motor over the shunt. Note that the efficiency of a dc machine will vary with the operating. Ee301 dc motors part ii 3 112016 pin pout ploss pa as the motor speeds up, the contact arm moves to sequentially remove starting resistors from the circuit example. The permanent magnet motor uses a magnet to supply field flux. There are three main varieties of dc motors, all of which make use of the relations above.
Any dc machine can act either as a generator or as a motor. 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. In this course notes we shall consider the motor drive system operation in the steady state only. The 3phase set of currents, each of equal magnitude and with a phase. Pdf basic electrical engineering 1st year ebook, notes. Motor starters 3 point and 4 point starters protective devicescalculation of starter steps for d.
The electrical power flowing into a dc motor, or the electrical power flowing out of a dc. Dc motor is mainly constructed from two main parts, the stator and the rotor as shown in fig. Doehdbk1011192 june 1992 doe fundamentals handbook electrical science volume 1 of 4 u. Note electrical machines 2 em2 by deepak kumar sahoo. Notes about relays to make a relay change states, the voltage. There are also links to powerpoint slideshows that show the animations seen in the presentations.
Information and entropy, conditional entropy and redundancy, shannon fano coding, mutual information, information loss due to noise, source codings huffman code, variable length coding, source coding to increase average lnfomtation per bit. In general, a dc motor,s stalling torque is equal to its starting torque. Clicking on the following links will allow you to down load adobe acrobat files of the class lecture notes. The motor is fed from a chopper which provides both motoring and braking operations. Ee 361 laboratory manual and lecture notes, middle east technical university. It has a maximum speed of 500 rads with a maximum current of 2 a. Dc motor, generators and energy conversion devices lecture. An advantage of dc motors is that it is easy to control their speed in a wide diapason. Motor property 1 torque is proportional to current question. For a dc motor, the efficiency is the electrical output power divided by the mechanical input power, or for a dc generator, the efficiency is the electrical output power divided by the mechanical input power, or note that the efficiency of a dc machine will vary with. Massachusetts institute of technology department of electrical engineering and computer science 6.
The successive sections explain the implementation of code drivers using the mpc5604b mcu. A permanent magnet dc motor has a machine constant, kv 1. The basic idea of an electric motor is to generate two magnetic fields. This mean that a digital signal is used to drive the motor and every time it receives a digital pulse it rotates a specific number of degrees in rotation. Its operation is based on the principle that when a current carrying conductor is placed in a. Dc motor rotor construction commutator poles rotor winding fan bearing brushes. Other members of the family are the directcurrent dc motor or generator, the induction motor or generator, and a number of derivatives of all these three.