Synchronous Machines - E-Courses

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Electrical <strong>Machines</strong> II Prof. Krishna Vasudevan, Prof. G. Sridhara Rao, Prof. P. Sasidhara Rao V V V V V Indian Institute of Technology Madras V B S N (a) Conductor moving at right angles to magnetic field V VV V V V B S N V θ (c) Conductor moving at any angle across to magnetic field V V V V B S N V (b) Conductor moving parallel to magnetic field B θ S 180 N 0-θ (d) Conductor moving at any angle across magnetic field Figure 3: Effect of change of flux linkages on induced EMF in a conductor 4
Electrical <strong>Machines</strong> II Prof. Krishna Vasudevan, Prof. G. Sridhara Rao, Prof. P. Sasidhara Rao 1.2 Direction of induced e.m.f Induced EMF Indian Institute of Technology Madras S V V V V V Field Motion (a) Right-hand rule V B S N (b) orthogonal relations N Figure 4: Fleming’s right hand rule for direction of induced EMF The direction of the induced emf is given by Fleming’s Right Hand Rule which states: If the thuMb, First finger and the seCond finger of the right hand are stretched out and held in three mutually perpendicular directions such that the First finger is hold pointing in the direction of the magnetic field and the thuMb pointing in the direction of motion, then the seCond finger will be pointing in the direction of the induced emf such that the current flows in that direction. As shown in Fig. 4 the induced emf is in a direction so as to circulate current in the direction shown by the middle finger. Schematically we indicate the direction of the emf by a dot (or a cross) as shown in Fig. 5(a) to represent an emf so 5
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