L-37(TB)(ET) ((EE)NPTEL)

# L-37(TB)(ET) ((EE)NPTEL) - Module 9 DC Machines Version 2...

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Module 9 DC Machines Version 2 EE IIT, Kharagpur

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Lesson 37 EMF & Torque Equation Version 2 EE IIT, Kharagpur
Contents 37 EMF & Torque Equations 4 37.1 Goals of the lesson ………………………………………………………………. 4 37.2 Introduction ……………………………………………………………………… 4 37.3 EMF & Torque Equations ………………………………………………………. . 4 37.3.1 EMF Equation ………………………………………………………… 5 37.3.2 Torque Equation ………………………………………………………. . 6 37.4 GNP and MNP …………………………………………………………………. .. 6 37.5 Armature reaction ………………………………………………………………. . 7 37.5.1 No Load operation ……………………………………………………. . 8 37.5.2 Loaded operation ………………………………………………………. 8 37.6 Cross magnetizing & Demagnetizing AT ………………………………………. 9 37.6.1 Commutation & Armature reaction …………………………………… 11 37.7 Tick the correct answer …………………………………………………………. . 13 37.8 Answer the following ……………………………………………………………. 14 Version 2 EE IIT, Kharagpur

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37.1 Goals of the lesson After going through the lesson, the student will be able to understand: 1. the factors on which induced voltage in the armature depend. 2. the factors on which the electromagnetic torque developed depend. 3. the derivation of the emf and torque equations. 4. that emf and torque equations are applicable to both generator and motor operations. 5. why the generated emf in motor called the back emf. 6. armature reaction, its ill effects and remedial measures. 7. the purpose of compensating winding – its location and connection. 8. the purpose of interpole – its location and connection. 9. the difference between the GNP (geometric neutral plane) and MNP (magnetic neutral plane). 37.2 Introduction Be it motor or generator operations, the analysis of D.C machine performance center around two fundamental equations namely the emf equation and the torque equations. In fact both motoring and generating actions go together in d.c machines. For example in a d.c motor there will be induced voltage across the brushes in the same way as in a generator. The induced voltage in d.c motor is however called by a different name back emf . Thus the factors on which induced emf in generator depend will be no different from motor action. In fact the same emf equation can be employed to calculate induced emf for both generator and motor operation. In the same way same torque equation can be used to calculate electromagnetic torque developed in both motoring and generating actions.
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L-37(TB)(ET) ((EE)NPTEL) - Module 9 DC Machines Version 2...

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