Hierarchical organization of motor structures level 4. Lecture 6 three phase induction motors cairo university. Unit 1 synchronous reluctance motors constructional. Though these machines are useful for small outputs, they are.
Explain how this motor can be operated as either a synchronous motor or a plain induction motor. Core or proximal stiffening provides a base for the limb movement. Induction machine control and simulation c 2003 james l. Clicking on the following links will allow you to down load adobe acrobat files of the class lecture notes. A short course on synchronous machines and synchronous. Search wegsynchronousmotors50019091brochureenglish. Vector control of pm synchronous motor drive system using hysteresis current controller 1rajesh p.
Massachusetts institute of technology mit opencourseware. Brain stem red nucleus, reticular formation, vestibular nuclei, tectum, pontine nuclei, inferior olive level 1. Typical motor applications include compressors, pumps, blowers, and mg sets. It is a motor that can rotate in both directions, move in. Einstein college of engineering einstein college of engineering an institution affiliated to anna university, tirunelveli sir. This winding is spatially distributed for polyphase ac current. Highperformance variablespeed motor drives are often constructed using a permanentmagnet synchronous motor. Department of electrical engineering and computer science. The stator and rotor windings of the motor are connected in series through the rotor commutator.
In fact, a given synchronous machine may be used, at least theoretically, as an alternator, when driven mechanically or as a motor, when driven electrically, just as in the case of d. Stepper motors stepper motor an electromagnetic actuator. The structure of reluctance motor is same as that of salient pole synchronous machine as shown in fig. For the love of physics walter lewin may 16, 2011 duration. 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. The stator is the outer shell of the motor, which carries the armature winding. Induction motors induction motors are the most commonly used prime. Slip test is performed in a salient pole synchronous machine to measure the 1 direct axis synchronous reactance and 2 the quadrature axis synchronous. Consult the slosyn motor catalog for a complete description of the motor identification system and a list of the motors available. Typically, a synchronous motor has a stator with a winding similar to that of an induction motor. Voltage for a superior motor synchronous motor characteristics starting and stopping rapid starting, stopping and reversing are among the advantages of superior electric synchronous motors. Specialpurpose electric machines the machines introduced in this lecture are used in many applications requiring fractional horsepower, or the ability to accurately control position, velocity or torque.
To study the different starting methods of of 3 type of motor. Levent cetin insynchronous motors, the rotor is an electromagnet and a dc power applied to it. Ac synchronous motors speed of 72 rpm and a torque output of 200 ounceinches at 120 volts, 60 hertz, the ss221 motor, which produces 220 ounceinches of torque at 72 rpm, could be specified. Enclosures typical motor enclosures include dpg ic01 ip22, wp i ic01ipw23, wp ii ic01ipw24, tewac ic817ip54, and teaac ic611 or industry standards ic616ip54. Apr 04, 2008 lecture series on power electronics by prof.
Lecture 30 speed control of induction motor part 1 youtube. Search weg synchronous motors50019091brochureenglish. Introduction to synchronous motor the engineering projects. Therefore the universal motor is also known as an ac series motor or an ac commutator motor. Lecture notes threephase synchronous machines saad m. The starting device adds to the cost of the motor and also requires more space. The range of motionmotor control continuum improving prom decreases motor control. Smart 2010 servo motor dc motors with feedback position control as long as the coded signal exists on the input line, the. Motor control electrical engineering and computer science.
Though these machines are useful for small outputs, they are not used for large powers as. Magnetic poles of synchronous and induction motors are 180 electrical degrees apart. However, this increased prom does not transfer to function. Describe how a squirrel cage motor is built, and classify it as either an induction motor or a synchronous motor. To study how to reverse the direction of rotation in 3 type of motor. It is an incremental drive digital actuator and is driven in fixed angular steps. On large generators and motors, brushless exciters are used.
Universal motor the universal motor is a rotating machine similar to a dc motor but designed to operate either from dc or singlephase ac. Drives lecture 1 free download as powerpoint presentation. Synchronous motor, alternatingcurrent electric motor designed to run at a speed that is directly proportional to the frequency of the electric power source. Motor speed may be controlled over a limited range by varying the line voltage. Varying the slip of the motor for a given load slip control may be accomplished by 1. A threephase stator similar to that of an induction motor.
The machine is named synchronous since at steadystate the rotor speed is proportional to the frequency of currents and voltages in the stator. List and describe the more commonly used equipment in an electric substation. A synchronous motor is composed of the following parts. In general, overexcitation will cause the synchronous motor to operate at a leading power factor, while underexcitation will cause the motor to operate at a lagging power. In synchronousrotor construction it is common to use a combination of squiirrel cage and wound rotor. Gopakumar, centre for electronics design and technology, iisc bangalore. Motor parameters time constant, electrical te winding current to reach 63. Jun 04, 2014 for the love of physics walter lewin may 16, 2011 duration. Threephase induction motors are the most common and frequently encountered machines in industry simple design, rugged, lowprice, easy maintenance wide range of power ratings. Continuous torque is the torque a motor can produce continuously without exceeding the thermal limit of the winding insulation peak torque. Hierarchical organization and functional segregation of central motor structures level 4. The rotor of a synchronous machine is a large electromagnet. Synchronous machines the inductance of the stator winding depends on the rotor position energy is stored in the inductance as the rotor moves, there is a change in the energy stored either energy is extracted from the magnetic field and becomes mechanical energy that is, its is a motor or energy is stored in the magnetic field and.
Motor control rss lecture 3 monday, 7 feb 2011 prof. Eb is set up in the armature stator by the rotor flux which opposes the applied voltage v. This lecture will provide information on the following aspects. The basic use of a synchronous motor is power factor correction that means to increase the power factor of a system. Single phase induction motors sizes vary from 1400 kw to 125 kw are used in toys, hair dryers, vending machines etc. Fall 2005 ee595s electric drive systems 2 overview of strategies voltsperhertz control constant slip control fieldoriented control. Of synchronous machines the synchronous electrical generator also called alternator belongs to the family of electric rotating machines. Synchronous and asynchronous electromechanicalsystems dr. Rotatingfield type the armature winding is on the stator and the field system is on the rotor. Raman nagar seethaparpanallur tirunelveli department of electrical and electronics engineering me 36 electrical drives and control iii sem mechanical engg. Synchronous motors have the following characteristics. Synchronous machine simulation models c 2005 james l. 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. Electric motors rss technical lecture 2 friday, 10 feb 2012 prof.
Synchronous and asynchronous electricmotors the electric motor is an electromechanical continuous energy conversion equipment that converts electrical energy into electrical energy mechanical energy. When the synchronous motor operates with constant power input, the variation of armature current with field current is thus a shaped curve, as illustrated in. Vector control of pm synchronous motor drive system using. Massachusetts institute of technology department of electrical engineering and computer science 6. Fall 2005 ee595s electric drive systems 3 voltsperhertz control. Synchronous motor 24800 hp at 225 rpm with tewac enclosure driving. Power and torque in synchronous generators the real output power of the synchronous generator is p v i v i out t l a 3 cos 3 cos the reactive output power of the synchronous generator is q vi viout t l a 3 sin 3 sin recall that the power factor angle is the angle between v and i a and not the angle between e a and i a. Oct 07, 2016 introduction to synchronous motor wont be complete unless we have a look at its uses and areas of application, i am sharing some of the uses of synchronous motor which are given below. This armature creates a rotating magnetic field inside the motor. Differentiate between the various types of generating electric power stations. The torque at which the kt rollsoff reduces by 10% as a function of. Lesson 18 synchronous motor operation and applications. In this document we develop models useful for calculating. The synchronous machine synchronous ac machines find application as motors in constant speed applications and, when interfaced to the power source with a variablefrequency converter system, in variablespeed applications.