Find the percentage slip and number of poles of the induction motor. For applications where high degree of accuracy in speed control is not required simple methods based on steady state equivalent circuit have been employed. Threephase induction motors ims were adopted in the 1990s for traction systems. Our marine certified variable frequency drives vfd regulate the speed and torque of. Performance of the drive has been evaluated through the different variation in reference speed and load torque.
Induction and synchronous motor drives, starting, running, speed control, braking, size and rating of motors short time, intermittent, continuous, mechanical considerations enclosure, bearing transmission of drive, through chain, pulley and gears noise. Another aspect in induction motor drives which has been researched recently is the use of multiphase induction motors where the number of stator phases is more than. Squirrel cage induction motor is used in lathes, drilling machine, fan, blower printing machines etc. In the electrical model, the voltage, v, and the slip, s, determine the rotor current. Abb is a leading international supplier of medium voltage ac drives in the range of. Identifying the vibration problems that can occur in induction motor drives have an added complexity due to the rotating magneticfields in the machine. The singlemotordrive design singlemotor configurations are commonly used in applications which require large, independent and decentralized drives. Kannapiran assistant professor department of electronics and communication engineering. Ac motors are highly flexible in many features including speed control vsd variable speed drives and have a much larger installed base. Electric drives are systems where the electric motors or generators are. On the other hand in a vfd controlled motor, initially low voltage at low frequency is applied. Variable frequency drive for induction motor elprocus. Direct torque control for induction motor drives main features of dtc decoupled control of torque and flux absence of mechanical transducers current regulator, pwm pulse generation, pi control of flux and torque and coordinate transformation are not required very simple control scheme and low computational time. Krishnan, electric motor drives modeling, analysis, and control, prentice hall 2001 2.
It supplies an induction motor ich has a full load speed of 144wh 0 rpm. The reason for describing induction motors as constant speed is because normally these motors have a constant speed depending. Identifying the vibration problems that can occur in inductionmotor drives have an added complexity due to the rotating magneticfields in the machine. Chapter 3 induction motor and different speed control methods page no. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Three phase transformer winding the transformation of. Induction motor drives a operation with unbalanced source voltage and single phasing, operation with unbalanced rotor impedances, analysis of induction motor fed from a nonsinusoidal voltage supply, starting braking, transient. The following information provides a brief definition and some application considerations regarding motor data on the nameplate. Variable input voltage variable rotor resistance variable rotor power variable voltage and variable frequency, vvvf drive vsi vf inverter drive variable current and variable frequency, vcvf. Remote mounting an acscp or dcs800pan keypad english pdf. Induction motor parameters locked rotor test the locked rotor. Differentiate between the various types of generating electric power stations.
Micro and machinery drives for machine building, industrial drives for controlling. Induction motor totallyenclosed fancooled nema standard epact three phase induction motors sdesign versatility teco totally enclosed fan cooled squirrelcage induction motors are designed, manufactured and tested to meet or exceed the latest nema, ieee, csa and. The rotor of an induction motor can be a squirrel cage rotor or wound. Ss 120 x f p 120 x 60 8 900 rpm rotor speed motor slip is known, equation 2. Note connecting cp600 to motion products via modbus rtu english pdf. In order to prevent the high short circuit current from destroying the healthy device, the base drive to the healthy transistor of the same phase leg should be. The electric energy generated purchased by consumers for different needs. This torque is related to the motor output power and the rotor speed and out. Ee6601 solid state drives ssd syllabus unit i drive characteristics electric drive equations governing motor load dynamics steady state stability multi quadrant dynamics. Acs355 drives quick installation and startup guide english pdf manual acs355 list of. Fault analysis of induction motor drive system using maxwellsimplorer 5 it would lead to complete shutdown of the system. The basic idea of an electric motor is to generate two magnetic fields.
Routine test of three phase induction motor vishant naik1, saurabh k singh2, sahil chawhan3, jatin wankhede4. Here you can download the industrial drives and applications vtu notes pdf ida pdf vtu of as per vtu syllabus. The rotor will constantly be turning to align its magnetic field with that of the stator field. Note us remote monitoring services for mv drives english pdf brochure. The need for energy conservation is increasing the requirements for saving the electrical energy. Braking scheme for vectorcontrolled induction motor drives. The 3phase set of currents, each of equal magnitude and with a phase. Nov 03, 2019 an induction motor also known as an asynchronous motor is a commonly used ac electric motor. A successful salesman for general electrics motor division once remarked to one of your instructors that, when asked by a customer how a motor. Problems and premature failures often indicate input power system troubles, poor or deteriorating mechanical installations, or malfunctions in the driven machinery.
Before discussing, induction motor drives its important to understand and know about induction motors. The induction motor cannot make a quickreversal run because of the torque acting in the opposite therefore stop the induction motor once, change the wire connections and make a reverse run construction characteristics coding system motor ac power supply mounting frame option d2 l a 4. They are generally more expensive than induction motor dri ves,but the advantages is that the efficiency is higher,which is tends to lower the life cycle cost. Induction motors and transformers both im and transformer works on the principle of induced voltage transformer. Mostafa elshahed objectives learn a brief history of the electrical power systems construction. To analyze and design the current and speed controllers for a closed loop solidstate. It consists of an electric motor motors, a transfer mechanism, an electrical energy converter, and a control system. Syllabus, question banks, books, lecture notes, important part a 2 marks questions and important part b 16 mark questions, previous years question papers collections.
Induction motor testing and evaluation summary as energy costs rise, more emphasis is being placed on determining the health of large inductive motors. They are used to adapt the motor speed to the actual need, thus optimizing. By controlling the output ac frequency, it is possible to drive the motor at different speeds based on the requirements. Energy efficient control of threephase induction motor drive. First noload test the noload test, like the open circuit test on a transformer, gives information about exciting current and rotational losses. T s t 2 3 2 3 sa b sc e i a i b in principle thedtc method selects one of the six nonzero and two zero voltage vectors of the inverter on the basis of the instantaneous errors in torque and stator flux magnitude. An induction motor also known as an asynchronous motor is a commonly used ac electric motor.
My original aim was to bridge the gap between specialist textbooks which are pitched at a level too academic for the. The test is performed by applying balanced rated voltage on the stator. An induction motor is presented as an electromechanical power converter, and basic relations between the electrical, magnetic and mechanical quantities in the motor will be explained. Since, number of poles of a motor is fixed at the time of construction, special motors are required with provision of pole changing windings. The induction motor is made up of the stator, or stationary windings, and the rotor. Numerical examples about three phase induction machines. Another aspect in induction motor drives which has been researched recently is the use of multiphase induction motors where the number of stator phases is more than three. The synchronous speed of the motor is given by equation 1. In an induction motor, the electric current in the rotor needed to produce torque is obtained via electromagnetic induction from the rotating magnetic field of the stator winding. List and describe the more commonly used equipment in an electric substation.
Pdf control of induction motor drive using artificial. It is logical that the least expensive, lowest maintenance type motor should be used most often. In very simple words induction motors can be described as a threephase, selfstarting constant speed ac motors. Control of induction motor through stator voltage variable voltage characteristicscontrol of induction motor by ac voltage controllers waveforms speed torque characteristics. Anywhere a motor is used on board is a great opportunity to save energy. Induction machine control and simulation c 2003 james l. It is therefore important to optimize the efficiency of electrical drive systems under certain operating conditions.
Fall 2005 ee595s electric drive systems 2 overview of strategies. In this type of three phase induction motor the rotor is wound for the same number of poles as that of stator but it has less. You should also make a dc measurement of stator winding linetoline resistance using a dmm. Control of induction motor drive using artificial neural network. Soft starters are used for induction motor drives having fan, pump and blowers types load where load torque is directly proportional to square of speed. Advantages of 3 phase induction motor generally easy to build and cheaper than corresponding dc or synchronous motors induction motor is robust. Fall 2005 ee595s electric drive systems 3 voltsperhertz control. The theory used in the work was collected by studying literature on how electrical motors work, and by simplifying the. Motor speed relationship the synchronous speed of an ac motor is the speed of the rotating magnetic field set up by the stator winding synchronous speed rpm 120 x frequency divided by the number of poles. Chapter 3 induction motor and different speed control methods page no 3. Electrical input voltagethe voltage at which the motor is designed to operate.
Phasethis represents the number of ac power lines supplying the motor. Power semiconductor drives pdf notes psd pdf notes. This application note discusses the basics of an ac induction motor. Strangas, notes for an introductory course on electrical machines and drive, msu. Soft starters are used for induction motor drives having fan, pump and blowers types load where load torque is directly. Induction motor notes free download faadooengineers. Application notes vibration diagnostics for industrial electric motor drives the induction motor is the most widely employed industrial electricdrive. A course material on ee 2352 solid state drives by mr. Select number of stator slots and suitable three phase winding layout experience. What is common to all the members of this family is that the basic physical process involved in their operation is the conversion of electromagnetic energy. Control of induction motor through stator frequency.
Any mechanical load applied to the motor shaft will introduce a torque on the motor shaft. Ac induction motors are also the most common motors used in main powered home appliances. Acs355 the compact choice for machine builders machinery drives. The threephase induction motor is the extensively used for various kinds of industrial drives. The content of this book is divided into three basic parts. Pdf ee6601 solid state drives ssd books, lecture notes. Singlephase induction motor threephase induction motor singlephase induction motor there are probably more singlephase ac induction motors in use today than the total of all the other types put together. The increased use of adjustable frequency drives afds for motor control is also making it necessary to nameplate a frequency range, especially for hazardous duty listed applications. A three phase, 12 pole, salient pole alternator is coupled to a diesel engine running at 500 rpm. Motor current monitoring and analysis mcsa is a straight forward tool to diagnosing problems with large inductive motors. Record all nameplate information for the induction motor. Drives general 4 motor operation with converter supply 6 motor current waveforms 6.
Lecture 6 three phase induction motors cairo university. This is really a helpful aid in the writing of my project. When the motor reaches a steady state speed the connection changes from star to delta connection. Induction motor drives starting braking speed control of. The ac induction motor is the most used electrical motor in industrial applications worldwide. View notes machine 2 notes from ee 141 at stanford university. Variable frequency drive or vfd is the way that enables controlling of the speed of induction motor by applying varying frequency of ac supply voltage. Analytic design evaluation of induction machines january 12, 2006 c 2005 james l. Induction motor is one of the most important motor used in industrial applications. Regarding the dynamic response, it is important to note that. What is common to all the members of this family is that the basic physical process involved in their operation is the conversion of electromagnetic energy to mechanical energy, and vice versa.
A detailed analysis of various methods of starting an ac induction motor and their effects on motor characteristics pdf. The stator consists of a series of wire windings of very low resistance permanently attached to the motor frame. Leonhard, control of electrical drives, springer 2001 4. Single phase induction motor 1introduction the singlephase induction machine is the most frequently used motor for refrigerators, washing machines, clocks, drills, compressors, pumps, and so forth.
Induction motor drive elec46 electric drive systems 1. Fall 2005 ee595s electric drive systems 2 overview of strategies voltsperhertz control constant slip control fieldoriented control. Although ac induction motors are easier to design than dc motors, the speed and the torque control in various types of ac induction motors require a greater understanding of the design and the characteristics of these motors. A detailed analysis of various methods of starting an ac induction motor and their effects. An electronically controlled braking resistor across the dc link is not used. Pwminverterfed induction motor drives equipped with a three phase diode rectifier. Three phase transformer winding the transformation of 3 current at one voltage to another can be done by means. Motor analysis block diagram induction motor starting can be analyzed using electrical, mechanical, and thermal models which interact as diagrammed in figure 1. The motor is mounted in a test rig that allows one to control the torque applied to the motor shaft and to measure both rpm and torque. With the availability of semiconductor devices for static frequency conversion, most of the adjustable speed drives are now inverter fed drives. The summation of all torques acting on the motor shaft comprises the mechanical model. Stator voltage control using ac voltage controllers. Massachusetts institute of technology department of electrical engineering and computer science 6. Vector control of induction motor drives springerlink.
Timken bearing selection techniques as applied to mainshaft direct and hybrid drives for wind turbines. In an ordinary induction motor, switched on using an ac switch, the current drawn is much higher than the rated value and can increase with the increased acceleration of the load to attain the full speed of the motor. Application notes vibration diagnostics for industrial. Industrial drives and applications vtu notes pdf ida pdf. Target motor theory 4 3phase ac induction motor vector control motorola 3. The motor with national specifications is of heatproof class 120 e. The induction motor cannot make a quickreversal run because of. Induction motors are extensively used in industrial and household appliances and consume more than 50% of the total generated electrical energy. It is required to reduce the speed of the motor to rpm by. Massachusetts institute of technology mit opencourseware. Power electronic converters for induction motor drives.
It is logical that the least expensive, lowest maintenance type. For example thruster drives for dynamic positioning of drilling vessels and floating production vessels or main propulsion drives. Be careful it can hurt to tangle with a threephase motor. Jun 08, 2019 the induction motor drives are normally designed to run on delta connection, but during starting the supply is given from star connection because then the starter voltage and current reduces by 1v3 times than the delta connection. Other motors that are included are 1phase induction motors, permanent synchronous motors and synchronous reluctance motors. In general, the induction motor is cheaper and easier to maintain compared to other alternatives. Siemens standard drives division manufacture standard inverters up to. Therefore, motor troubleshooting involves the entire system, not just the. A variable speed drive vsd consists of a motor and some form of controller. Construction and steadystate operation of induction motors.
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