Here you can download the free lecture notes of control systems pdf notes cs notes pdf materials with multiple file links to download. 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. Conduct locked rotor tests on 3phase induction motors conduct noload tests on 3phase induction motors. Ac motor, main drive controller assembly, and driveoperator interface 210211 ac motor.
Testing and commissioning procedure for electric motors eep. Fall 2005 ee595s electric drive systems 3 voltsperhertz control history. Control systems pdf notes cs notes pdf book starts with the topics covering concepts of control systems, transfer function of dc servo motor ac servo motor synchro transmitter and receiver, standard test signals time response of first order. A three phase, 12 pole, salient pole alternator is coupled to a diesel engine running at 500 rpm.
An introduction to electric motors stmicroelectronics. Noload and blocked rotor test on an induction machine aim. Electrical machines 1 pdf notes em 1 pdf notes smartzworld. Massachusetts institute of technology department of electrical engineering and computer science 6. This conversion is usually obtained through the generation of a magnetic field by means of a current flowing into one or more coils. A successful salesman for general electrics motor division once remarked to one of your instructors that, when asked by a customer how a motor. Pdf test file congratulations, your computer is equipped with a pdf portable document format reader. Ac motors are used worldwide in many applications to transform electrical energy into mechanical energy.
Mukhopadhyay, department of electrical engineering, iit kharagpur. Nptel provides elearning through online web and video courses various streams. The ac electric motor used in a vfd system is usually a threephase induction motor. For reason of economy, most houses, offices and also rural areas are supplied with single phase a. Dc machines 1 dc machines transformsmechanicalenergyintoelectric energywithdc voltage and currentdc generatoror dynamo, or converselydc motor. Electrical, electronics and communications engineering. Figure 3typical scale on the megger insulation tester. How to test three phase ac motors learning electrical. Singlephase ac motors are the most common motors built. Since 20, through an online portal, 4, 8, or 12week. Umanand, principal research scientist, power electronics group, cedt, iisc bangalore for more detail. The cable, winding, current transformer, potential transformer, transformer bushing, on which tan delta test or dissipation factor test to be conducted, is first isolated from the system. Nptel syllabus electrical machines i video course course outline synchronous machines.
It should be noted that the scope of motor testing depends upon the motor type and size, this being indicated on the inspection forms. Indicated power ic engine testing it is the power developed in the cylinder and thus, forms the basis of evaluation of combustion efficiency or the heat release in the cylinder. You should be able to view any of the pdf documents and forms available on our site. For three phase motors, connection type is either star y or delta ac motor winding continuity test using a multimeter, check the continuity of motor winding from phase to phase u to v, v to w, w to u. This chapter will describe the most common types found on army watercraft. Introduction to industrial automation and control 2. Gradually apply three phase voltage across motor stator terminals via the autotransformer d. Debaprasad kastha, department of electrical engineering, iit kharagpur. Each phase to phase must have a continuity if winding is ok. Fall 2005 ee595s electric drive systems 2 overview of strategies voltsperhertz control constant slip control fieldoriented control. Output frequency and voltage is controlled electronically by controlling the width of the pulses of voltage to the motor. Lecture series on industrial automation and control by prof. Reluctance machines, induction machines, synchronous machines, stepper motors, and brushless dc motors.
A variablefrequency drive is a device used in a drive system consisting of the following three main subsystems. In this type of drive, a diode bridge rectifier provides the intermediate dc circuit voltage. Ac motors are fairly basic devices that consist of one or more run windings and one or more start windings. They only have two moving parts, the rotor and the start switch, which means that they are pretty easy to test and fix when you notice something is going wrong with the device. Ieee std 1122004, ieee standard test procedure for. Some types of singlephase motors or synchronous motors can be advantageous in some situations, but. The complete guide to electrical insulation testing. Disconnect any mechanical load connected to the induction motor. There are two basic reasons for the use of singlephase motors rather than 3phase motors.
Nptel, online courses and certification, learn for free. The rotor of an induction motor can be a squirrel cage rotor or wound type rotor. The most common type of ac motor being used throughout the work today is the induction motor. Determination of equivalent circuit parameters no load test. Find the percentage slip and number of poles of the induction motor. Since there is such a wide variety of these motors, it is impossible to describe all of them. Craig 4 in rotational electromechanical devices other than dc machines, torque is produced as a result of one or more magnetic fields which rotate about the air gap of the device. Single phase induction motor double revolving field theory the threephase induction motor starting torque inversely depends on the slip this implies that a small positive slip 0.
In blocked rotor test, the machine shaft is locked or is prevented from rotating via external means. Synchronous and asynchronous alternating current motors theacmsare simplier instructure andmore economicthandcms. Pulse width modulated pwm drives rockwell automation. Mechanical energy what is an electric motor an electric motor is a device converting electrical energy into mechanical energy usually a torque.
Learn for free, pay a small fee for exam and get a certificate. A very lowfrequency test voltage is applied across the equipment whose insulation to be tested. There is no difference between squirrel cage and slip ring motors. In many cases, the singlephase motors on board a ship will be wired into the lighting distribution panels. 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.
Be careful it can hurt to tangle with a threephase motor. Note down the machine ratings and calculate rated current of the machine noload test. The lighting distribution panels are the source for singlephase power supply. Circuit diagram for noload and blockedrotor test on 3 phase induction motor a. An ac motor of this type may be part of a pump or fan or connected to some other form of mechanical equipment such as a winder, conveyor, or mixer. An acm generates more power comparing with a dc motor that has the same dr. Applications of threephase induction motors of size varying from half a kilowatt to thousands of kilowatts are numerous.
Spectacular failures that triggered the birth of fracture mechanics, modes of loading, classification as lefm and epfm, crack. Lecture series on basic electrical technology by prof. The construction of the slipring induction motor is exactly similar to the construction of squirrel cage induction motor. An induction motor also known as an asynchronous motor is a commonly used ac electric motor. It supplies an induction motor ich has a full load speed of 144wh 0 rpm. If any particular phase fails the continuity test, your motor is probably burnt. The course covers the basic aspects of engineering fracture mechanics. Reverse side of card at right is used to record the test data. There are many types of ac motors, but this course focuses on threephase induction motors, the most common type of motor used in industrial applications. The book deals with the fundamentals, theory, and design of conventional cars with internal combustion engines ices, electric vehicles evs, hybrid.
Nptel syllabus industrial automation and control video course 1. It is true that single phase motors are less efficient substitute for 3phase motors but 3phase power is normally. In the intermediate dc circuit, the dc voltage is filtered in a lc lowpass filter. Armature reaction, separately excited and self excited generators, load characteristics of shunt, principle of operation, speed control of d. Brushless dc motors nyu tandon school of engineering.
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