Episode 4 single phase induction and shaded pole motors. The parameters of equivalent circuit of induction machines are. Ieee std 1122004, ieee standard test procedure for polyphase. Splitphase motor running as capacitor starts motor and as capacitor run motor article pdf available in leonardo electronic journal of practices and technologies 1528. An experiment using a 415 v, 2 hp, three phase induction motor having 36 stator slots with 72. Motors are susceptible to the gradual failure of their insulation resistance. If any particular phase fails the continuity test, your motor is probably burnt. When the test is performed on other than threephase power, the equations shall be. If the motor is completely unresponsive, no ac humming or false starts. The basic steps in ascertaining the health of a threephase ac motor are given below. The basic idea of an electric motor is to generate two magnetic fields. Graund test or body short test in continuity test we.
In this tutorial we explain how to check induction motor with series test lamp. Thus from the working principle of three phase induction motor, it may be observed that the rotor speed should not reach the synchronous speed produced by the stator. Practicing all polyphase induction motors electrical engineering questions and answers in online helps you to improve your ability to attend the real time gate, ies and bsnl jto exams. One single phase wattmeter plus miscellaneous apparatus as needed. If the speeds become equal, there would be no such relative speed, so no emf induced in the rotor, and no current would be flowing, and therefore no torque would be generated. Testing of induction motor december 30, 2018 february 24, 2012 by electrical4u demand of energy is growing day by day and along with it cost of energy rising abruptly, so now it is necessary that the health of large motors which consumes maximum power should be taken care off.
The windings all three in a threephase motor should read low but not. For this motors, we require three phase power supply. Conduct locked rotor tests on 3phase induction motors. The rotor will constantly be turning to align its magnetic field with that of the stator field. Consider the working of a motor for a better understanding of these indicators. Each phase to phase must have a continuity if winding is ok. Construction of three phase linear induction motor. How to test three phase ac motors learning electrical. Both of the motors that were tested were 12lead motors so that current probes could be placed in each phase, even though the load was delta connected. These motors run conveyor belts, pumps, fans, and many other applications.
For reason of economy, most houses, offices and also rural areas are supplied with single phase a. Isbn 9789535122074, pdf isbn 9789535163992, published 20151118. Pdf splitphase motor running as capacitor starts motor. Induction motors applications, control and fault diagnostics. One instrumentation rack with the usual test equipment. There are two basic reasons for the use of single phase motors rather than 3 phase motors. Threephase dualvoltage motor insulation resistance testing.
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