Single phase emf generation pdf

Rotor has 2 salient poles with field windings which can be magnetized by means of DC source. The loop PQRS is stationary and is perpendicular to the plane of the paper. When field windings are excited, magnetic field is produced around it. The direction of magnetic field passing through the armature core is shown in Figure 4. Let the field magnet be rotated in clockwise direction by the prime mover.

The axis of rotation is perpendicular to the plane of the paper. Assume that initial position of the field magnet is horizontal. At that instant, the direction of magnetic field is perpendicular to the plane of the loop PQRS. The induced emf is zero Refer case iii of section 4. This is represented by origin O in the graph between induced emf and time angle Figure 4. The induced emfs across PQ and RS would become maximum. Care has to be taken while applying this rule; the thumb indicates the direction of the motion of the conductor with respect to field.

For clockwise rotating poles, the conductor appears to be rotating anti-clockwise. Thank you so much. Points 3 Location Other Student of Engineering. Best website i have ever seen. Excellent notes! Points 33 Location Faridabad Student of. Well explained notes and ebook for Basic Electrical engineering.. Manjalika New User. Points 16 Location Delhi Student of Engineering. Microwice said:. Click to expand GreatST Newbie. Points 1 Location Faridabad Student of Engineering.

Thanks a lot for this. HrutujaJiwane New User. Points If fault occurs in any winding of 3-phase transformer, the rest of two winding can be used in open delta to serve the 3-phase load which is not possible in 1- transformer. A 3-phase system can be used to feed a 1- load, whereas vice- versa is not possible. Power to weight ratio of electrical machines To produce same amount of power, a single phase machine must be larger in size when compared to a three phase machine.

Requirement of conductor material Requirement of copper for a single phase Vs three phase system is in the ratio of 2 : 0. Rotatting magnetic field Rotating magnetic field is readily produced in the case of three phase alternators and induction machines whereas difficult to be produced in the case of single phase motors.

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