First noload test the noload test, like the open circuit test on a transformer, gives information about exciting current and rotational losses. Energy efficient control of threephase induction motor drive. Fault analysis of induction motor drive system using maxwellsimplorer 5 it would lead to complete shutdown of the system. Induction motor drive elec46 electric drive systems 1. Induction motors and transformers both im and transformer works on the principle of induced voltage transformer. Vector control of induction motor drives springerlink. In very simple words induction motors can be described as a threephase, selfstarting constant speed ac motors. The induction motor is made up of the stator, or stationary windings, and the rotor. A three phase, 12 pole, salient pole alternator is coupled to a diesel engine running at 500 rpm. Pwminverterfed induction motor drives equipped with a three phase diode rectifier.
Mostafa elshahed objectives learn a brief history of the electrical power systems construction. Three phase transformer winding the transformation of 3 current at one voltage to another can be done by means. Performance of the drive has been evaluated through the different variation in reference speed and load torque. The induction motor cannot make a quickreversal run because of. In the electrical model, the voltage, v, and the slip, s, determine the rotor current. List and describe the more commonly used equipment in an electric substation. 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. 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 is one of the most important motor used in industrial applications.
Nov 03, 2019 an induction motor also known as an asynchronous motor is a commonly used ac electric motor. Application notes vibration diagnostics for industrial electric motor drives the induction motor is the most widely employed industrial electricdrive. The test is performed by applying balanced rated voltage on the stator. Timken bearing selection techniques as applied to mainshaft direct and hybrid drives for wind turbines.
Record all nameplate information for the induction motor. Since, number of poles of a motor is fixed at the time of construction, special motors are required with provision of pole changing windings. Induction motor parameters locked rotor test the locked rotor. 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. Our marine certified variable frequency drives vfd regulate the speed and torque of. Regarding the dynamic response, it is important to note that. 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.
The synchronous speed of the motor is given by equation 1. Control of induction motor through stator voltage variable voltage characteristicscontrol of induction motor by ac voltage controllers waveforms speed torque characteristics. Abb is a leading international supplier of medium voltage ac drives in the range of. Siemens standard drives division manufacture standard inverters up to.
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. Control of induction motor drive using artificial neural network. It is logical that the least expensive, lowest maintenance type motor should be used most often. Lecture 6 three phase induction motors cairo university. Chapter 3 induction motor and different speed control methods page no. 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. You should also make a dc measurement of stator winding linetoline resistance using a dmm. The theory used in the work was collected by studying literature on how electrical motors work, and by simplifying the. 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. Pdf ee6601 solid state drives ssd books, lecture notes. The rotor will constantly be turning to align its magnetic field with that of the stator field. Three phase transformer winding the transformation of. 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. 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.
Anywhere a motor is used on board is a great opportunity to save energy. Strangas, notes for an introductory course on electrical machines and drive, msu. 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. A detailed analysis of various methods of starting an ac induction motor and their effects on motor characteristics pdf. Note us remote monitoring services for mv drives english pdf brochure. Motor current monitoring and analysis mcsa is a straight forward tool to diagnosing problems with large inductive motors. By controlling the output ac frequency, it is possible to drive the motor at different speeds based on the requirements. Soft starters are used for induction motor drives having fan, pump and blowers types load where load torque is directly.
This is really a helpful aid in the writing of my project. The threephase induction motor is the extensively used for various kinds of industrial drives. On the other hand in a vfd controlled motor, initially low voltage at low frequency is applied. Any mechanical load applied to the motor shaft will introduce a torque on the motor shaft. Fall 2005 ee595s electric drive systems 3 voltsperhertz control. With the availability of semiconductor devices for static frequency conversion, most of the adjustable speed drives are now inverter fed drives. This application note discusses the basics of an ac induction motor. A course material on ee 2352 solid state drives by mr.
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. Krishnan, electric motor drives modeling, analysis, and control, prentice hall 2001 2. 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. Massachusetts institute of technology department of electrical engineering and computer science 6. 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. Massachusetts institute of technology mit opencourseware. 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. 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. Variable frequency drive for induction motor elprocus. Numerical examples about three phase induction machines.
This torque is related to the motor output power and the rotor speed and out. Ss 120 x f p 120 x 60 8 900 rpm rotor speed motor slip is known, equation 2. 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. Phasethis represents the number of ac power lines supplying the motor. An induction motor also known as an asynchronous motor is a commonly used ac electric motor. Chapter 3 induction motor and different speed control methods page no 3.
Fall 2005 ee595s electric drive systems 2 overview of strategies voltsperhertz control constant slip control fieldoriented control. Induction motor drives starting braking speed control of. 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. Therefore, motor troubleshooting involves the entire system, not just the.
The ac induction motor is the most used electrical motor in industrial applications worldwide. 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. Kannapiran assistant professor department of electronics and communication engineering. Pdf control of induction motor drive using artificial. The singlemotordrive design singlemotor configurations are commonly used in applications which require large, independent and decentralized drives. Leonhard, control of electrical drives, springer 2001 4. Acs355 the compact choice for machine builders machinery drives. The summation of all torques acting on the motor shaft comprises the mechanical model. The basic idea of an electric motor is to generate two magnetic fields. Braking scheme for vectorcontrolled induction motor drives.
The content of this book is divided into three basic parts. A detailed analysis of various methods of starting an ac induction motor and their effects. The reason for describing induction motors as constant speed is because normally these motors have a constant speed depending. Fall 2005 ee595s electric drive systems 2 overview of strategies. The electric energy generated purchased by consumers for different needs. Application notes vibration diagnostics for industrial. Select number of stator slots and suitable three phase winding layout experience. Power electronic converters for induction motor drives. It is required to reduce the speed of the motor to rpm by. Identifying the vibration problems that can occur in induction motor drives have an added complexity due to the rotating magneticfields in the machine.
Analytic design evaluation of induction machines january 12, 2006 c 2005 james l. The 3phase set of currents, each of equal magnitude and with a phase. 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. Industrial drives and applications vtu notes pdf ida pdf. It consists of an electric motor motors, a transfer mechanism, an electrical energy converter, and a control system. When the motor reaches a steady state speed the connection changes from star to delta connection. A successful salesman for general electrics motor division once remarked to one of your instructors that, when asked by a customer how a motor. Motor analysis block diagram induction motor starting can be analyzed using electrical, mechanical, and thermal models which interact as diagrammed in figure 1. Differentiate between the various types of generating electric power stations. 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.
An electronically controlled braking resistor across the dc link is not used. Problems and premature failures often indicate input power system troubles, poor or deteriorating mechanical installations, or malfunctions in the driven machinery. Electrical input voltagethe voltage at which the motor is designed to operate. The stator consists of a series of wire windings of very low resistance permanently attached to the motor frame. It is therefore important to optimize the efficiency of electrical drive systems under certain operating conditions. The rotor of an induction motor can be a squirrel cage rotor or wound.
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. Electric drives are systems where the electric motors or generators are. Note connecting cp600 to motion products via modbus rtu english pdf. My original aim was to bridge the gap between specialist textbooks which are pitched at a level too academic for the. 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. Identifying the vibration problems that can occur in inductionmotor drives have an added complexity due to the rotating magneticfields in the machine. 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. Target motor theory 4 3phase ac induction motor vector control motorola 3. Drives general 4 motor operation with converter supply 6 motor current waveforms 6. To analyze and design the current and speed controllers for a closed loop solidstate.
Induction motors are extensively used in industrial and household appliances and consume more than 50% of the total generated electrical energy. 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. Ac induction motors are also the most common motors used in main powered home appliances. Remote mounting an acscp or dcs800pan keypad english pdf. Threephase induction motors ims were adopted in the 1990s for traction systems. 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. In general, the induction motor is cheaper and easier to maintain compared to other alternatives. Construction and steadystate operation of induction motors.
It is logical that the least expensive, lowest maintenance type. It supplies an induction motor ich has a full load speed of 144wh 0 rpm. The following information provides a brief definition and some application considerations regarding motor data on the nameplate. Power semiconductor drives pdf notes psd pdf notes. 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.
Other motors that are included are 1phase induction motors, permanent synchronous motors and synchronous reluctance motors. Acs355 drives quick installation and startup guide english pdf manual acs355 list of. Control of induction motor through stator frequency. Before discussing, induction motor drives its important to understand and know about induction motors. Be careful it can hurt to tangle with a threephase motor. Squirrel cage induction motor is used in lathes, drilling machine, fan, blower printing machines etc.
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. The need for energy conservation is increasing the requirements for saving the electrical energy. Routine test of three phase induction motor vishant naik1, saurabh k singh2, sahil chawhan3, jatin wankhede4. For example thruster drives for dynamic positioning of drilling vessels and floating production vessels or main propulsion drives. Ac motors are highly flexible in many features including speed control vsd variable speed drives and have a much larger installed base. Stator voltage control using ac voltage controllers. Induction motor notes free download faadooengineers. A variable speed drive vsd consists of a motor and some form of controller. 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. 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 machine control and simulation c 2003 james l. Advantages of 3 phase induction motor generally easy to build and cheaper than corresponding dc or synchronous motors induction motor is robust. Induction motor testing and evaluation summary as energy costs rise, more emphasis is being placed on determining the health of large inductive motors.
1376 355 989 1632 571 728 873 793 547 1186 397 708 1323 889 968 671 265 1601 1278 366 1573 487 893 294 1499 793 1096 468 545 760