Eletricidade Geração Transmissão Distribuição e Aplicação

8/18/2019 Eletricidade Geração Transmissão Distribuição e Aplicação

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Corrente AlternadaLuiz Barros


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Corrente alternada

0V

- V

+v


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Corrente contínua

0 V

+V

tempot1 t2t3


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Corrente contínua

Corrente alternada

0V

- V

+v

tempo


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lâmpada

0V

- V

+v

apaga apaga apaga

CA


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Corrente alternada

0 V

-311 V

+311 V

+220 V

-220 V

V rms

V Pico

V Pico

V rms

seg

V Pico= V rms x √2


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MAGNETISMO


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MAGNETISMO

• Atração

• Repulsão


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DC Motors

• Just as the rotor reaches alignment, the brushesmove across the commutator contacts andenergize the next winding. In the animation thecommutator contacts are brown and the brushes

are dark grey. yellow s!ark shows when thebrushes switch to the next winding.


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C Induction Motor

• "he rotating magnetic #ield o# the stator drags the rotor around. "he rotordoes not $uite kee! u! with the the rotating magnetic #ield o# the stator. It#alls behind or sli!s as the #ield rotates. In this animation, #or every time themagnetic #ield rotates, the rotor only makes three #ourths o# a turn. I# you#ollow one o# the bright green or red rotor teeth with the mouse, you willnotice it change color as it #alls behind the rotating #ield. "he sli! has beengreatly exaggerated to enable visualization o# this conce!t. real inductionmotor only sli!s a #ew !ercent.


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Eletricidade Geração Transmissão Distribuição e Aplicação