This document is primarily tutorial in nature as it is intended to provide guidance and direction in the design of electric power service. These are of two types, squirrel cage and slip ring motors. We are ideally looking for someone who aspires to be an engineering manager. We also discuss the construction of a three phase motor including its. Threephase induction motors are also called asynchronous motors. Product and solutions for machine safety jokab safety 90. Several additional components are necessary to operate the single phase motor. Fundamental wave model of lineoperated induction machine. The single phase induction motor is the most frequently used motor for refrigerators, washing machines, clocks, drills, compressors, pumps, and so forth. Pdf analysis and design of a new type highefficiency single. Pdf lecture 1 single phase induction motor sri vidhya. Induction motor basics, single phase and three phase.
Although single phase induction motor is more simple in construction and is cheaper than a 3 phase induction motor of the same frame size, it is less efficient and it operates at lower power factor. According to the double field revolving theory, this alternating flux. Pdf starting winding optimization in singlephase induction motor. An887, ac induction motor fundamentals microchip technology. A simple explanation of how a 3 phase induction motor works. These motors are selfstarting and use no capacitor, start winding, centrifugal switch or other starting device. Cage induction machines institut fur elektrische energiewandlung.
Single phase motors have only two power source supply lines connected. The page also answers why single phase induction motor is not selfstarting. The result is a master that is much more compact and of higher performance than would be possible with electric motor drives. Scribd is the worlds largest social reading and publishing site. This strange behavior of single phase induction motor can be explained on the basis of doublefield revolving theory. A single phase induction motor is inherently not selfstaring can be shown easily. On the right side of figure 21 for example, each winding spans three slots.
Singlephase induction motors are used extensively for smaller loads, such as. A singlephase ac induction motor depends on extra electrical components to. An induction motor or asynchronous motor is an ac electric motor in which the electric current. In a split phase motor, the running winding should have a high resistance and low inductance b low resistance and high inductance c high resistance as well as high inductance d low resistance as well as low inductiance ans. Foreword this foreword is not a part of ieee std 6661991, ieee design guide for electric power service systems for generating stations.
These are also called as asynchronous motors because an induction motor always runs. Government worksprinted in the united states of america on acidfree paper10 9 8 7 6 5 4 3 2 1international standard book number. As an example, figure 12 shows torquespeed curves of the motor with two. Each of these components rotates in the opposite direction i. Three phase ac induction motors are widely used in industrial and commercial applications. Historically, mechanical gear sys tems were used to obtain variable speed. For example, a washing machine may use different speeds for each wash cycle. Pdf because of the negativesequence magnetic field, the singlephase induction motor has higher temperature, lower output torque and lower efficiency. Speed control of 3phase induction motor microchip technology.
Induction motors are the most commonly used motors in many applications. As an illustration example, the optimal designs of a 400v, 4pole, 40kw capacitor start and run motor based on these two strategies are provided and compared. Single phase induction motors multiple choice questions. Single phase induction motor 1introduction the single phase induction machine is the most frequently used motor for refrigerators, washing machines, clocks, drills, compressors, pumps, and so forth.
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