AC Generator

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By: swadhis (48 month(s) ago)

great sir..........................

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AC GENERATOR 1 weyes57

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Presented by V.SUBRAMANIAN, Post Graduate Teacher(Physics), Government Higher Secondary School, MANALI, CHENNAI – 600 068, TAMIL NADU STATE, INDIA. 2 weyes57

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AC Generator It is a device used for converting mechanical energy into electrical energy. This was originally designed by a Yugoslav scientist Nikola Tesla 3 weyes57

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Principle It is based on the principle of electromagnetic induction. Elecromagnetic induction An emf is induced in a coil,when it is rotated in an uniform magnetic field. 4 weyes57

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Essential Parts of An AC Generator Armature Field magnets Slip rings Carbon Brushes 5 weyes57

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Diagram of an AC Generator 6 weyes57

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Working of an AC Generator 7 weyes57

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Armature It is a rectangular coil consisting of a large number of turns of insulated copper wire wound over a laminated soft iron core. 8 weyes57

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Field magnets Permanent magnets are used in low power dynamos. Electromagnet is used in high power dynamos. 9 weyes57

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Slip rings The ends of the armature are connected to two hollow metallic rings, which are called slip rings. 10 weyes57

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Brushes 1.There are two carbon brushes. They provide contact with the slip rings. 2.They are used to pass on the current from the armature to the external Power line through the slip rings. 11 weyes57

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Working Whenever there is a change in the orientation of the coil,magnetic flux linked with it changes producing an induced emf in it. The direction of the induced emf is given by “Fleming’s right hand rule”. The armature rotates in clock-wise direction in the diagram shown in slide 13. 12 weyes57

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When the plane of the coil is parallel or( the coil is at an angle 0) to the field the emf induced is zero. When the plane of the coil is perpendicular or ( the coil is at an angle π/2) to the field the emf induced is maximum in the positive direction. When the plane of the coil is at an angle π to the field the emf induced is again becomes zero. When the plane of the coil is at an angle 3π/2 to the field the emf induced is maximum in the negative direction. When the plane of the coil is at an angle 2π to the field the emf induced is again becomes zero. 13 weyes57

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weyes57 15 e = E0 sinωt E0 = nAB ω Where, e is the induced emf at any instant of time. E0 is the peak value of the induced emf. n is the number of turns of the armature coil. A is the area of the coil. B is the intensity of the magnetic field. ω is the angular frequency of rotation of the coil. t is the time.

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16 weyes57 Fleming’s right hand rule

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Fleming’s right hand rule 17 weyes57

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weyes57 18 Related animations Courtesy 1.The university of New south Wales. 2.Arizona university

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