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Machiners TO ECE AB CD - Generated Voltages in AC and DC...

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Generated Voltages in AC and DC Machines B. Umamaheswari Professor DEEE
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Magnetic Field direction
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Direction of magnetic field
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Electromagnet in an Electrical machine
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3D=>2D presentation of AC machines stator rotor winding stator rotor
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Two-Pole Single-Phase Stator winding Coils are placed in slots over the inner circumference of the stator Coils are connected in series with a sinusoidal distribution as’ 2 Rotor Stator s φ as 1 as 2 as 3 as’ 1 as’ 3 as axis + - as 1 as’ 1 as 2 as’ 2 as 3 as’ 3 i as v as
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Two-Pole Two-Phase Stator Winding s φ as 1 as 2 as 3 as’ 1 as’ 2 as’ 3 as axis bs axis bs 3 bs 2 bs 1 bs’ 1 bs’ 2 bs’ 3 + - + - bs 1 bs 2 bs 3 as 1 as 2 as 3 i bs i as v as v bs
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EMF Generation
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DC Generators Replace the brushes with slip rings and you get a DC generator. Notice the voltage is not steady. The coil is shown at the top and bottom of the shaft.
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Magnetic Flux in DC machines Φ /2 rotor stator I f S S N N V f + - . . . . . . x x x x x x Armature Winding I f Φ a
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Lap Winding – 4 pole machine
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