Ac induction motors are also the most common motors used in main powered home appliances. The three phase induction motors are simple in construction, rugged, low cost and easy to maintain. The stator circuit model of an induction motor consists of a stator phase winding resistance r 1, stator phase winding leakage reactance x 1 as shown in the circuit diagram below the no load current i 0 is simulated by a pure inductive reactor x 0 taking the. It turns out that the similarity extends to the equivalent circuits of the two devices. Pdf this paper presented a dq model of a threephase induction motor with two stator. Vector control of threephase ac machines system development. The line current passes through the strip, which shuts down or restores the supply circuit as necessary. Record all nameplate information for the induction motor. The power input to a 3phase induction motor is 40 kw. Three phase emf generation, delta and star connection. Figure 1 daxis equivalent circuit of the induction mo. Mostafa elshahed objectives learn a brief history of the electrical power systems construction.
An electrical motor is an electromechanical device which converts electrical energy into mechanical energy. As that wave sweeps by the rotor bars, voltages are induced. Types, construction and principle of operation, 3 phase induction motor, general phasor diagram, equivalent circuit. Pdf performance study of threephase induction motor driving a load. The three phase induction motor is the extensively used for various kinds of industrial drives. Starting an induction motor using a dol starter 27. The following safety and common symbols may be used in this manual and on the equipment. For reason of economy, most houses, offices and also rural areas are supplied with single phase a. A novel scheme for reduction of torque and speed ripple in rotor.
Equivalent circuit diagram of a permanent magnet synchronous motor. Squirrel cage wound rotor with slip rings the rotating magnetic field. Advantages of 3 phase induction motor generally easy to build and cheaper than corresponding dc or synchronous motors induction motor is robust. List and describe the more commonly used equipment in an electric substation. A 3 phase induction motor can be used for different applications with various speed and load requirements. Find the synchronous speed, the full load speed and the frequency of rotor current at full load solution. With the law of induction, the equations of the threephase motor in vector. You should also make a dc measurement of stator winding linetoline resistance. This book addresses the vector control of threephase ac machines, in particular. This book is aimed at all those working in the field of drive technology. In the case of three phase ac alternating current operation, the most widely used motor is a 3 phase induction motor, as this type of motor does not require an additional starting device. The stator losses total 1 kw and the friction and winding losses total 2 kw. The threephase cage induction motor owes its good reputation as a rugged.
The shunt motor has the armature and field circuits wired in parallel, and this. Pdf this paper presented a dq model of a threephase induction motor with two stator phases. The springloaded brake can also be designed with manual release hl upon. The basic idea of an electric motor is to generate two magnetic fields. There are two types of induction motors, one with wound type rotor, also called slipring motor and another one with squirrelcage rotor. The three phase induction motor has voltage applied to the stator that creates a rotating flux wave. A very interesting book, which puts focus on winding schemes and the. The 3 phase set of currents, each of equal magnitude and with a phase. Chapter 6 level 3 nvq and technical certificate electrical. Pdf modeling of threephase induction motor with two stator. A 3phase, 60hz induction motor has a slip of 3 % at full load.
This final thesis will mostly be dedicated to induction motors but also to synchronous permanent magnet and reluctance motors. The stator of three phase induction motor is made up of numbers of slots to construct a 3 phase winding circuit which we connect with 3 phase. The design of this type of protection allows for manual or. Starting, braking and positioning with threephase cage induction. By far the most commonly used ac motor is the induction motor. Differentiate between the various types of generating electric power stations. One single phase wattmeter plus miscellaneous apparatus as needed. If the slip of the motor is 4%, find a the mechanical power output b the rotor cu loss per phase and c the efficiency. Approximate equivalent circuit of an induction motor. There are two basic reasons for the use of single phase motors rather than 3 phase motors. These types of motors are known as selfstarting induction motors.