Small electric generator science project,earthquake safety kit for car upholstery,survival gear kit tools,first aid kits portable - Tips For You

12.12.2015
We provide lots of teaching resources catered to your students' grade level and science requirements. Your goal is to inspire tomorrow's leaders and consumers with an intuitive understanding of energy. O artigo Como funcionam os motores eletricos explica como funcionam os motores com escovas.
Com o avanco dos computadores e transistores de potencia, tornou-se possivel "colocar o motor para fora" e eliminar as escovas.
A unica desvantagem de um motor sem escovas e seu maior custo inicial, mas normalmente da para recuperar esse custo devido a maior eficiencia obtida durante a vida do motor. Existem varios metodos - mecanicos e quimicos - para extrair o oleo das algas e converte-lo em um biocombustivel viavel. Step 1Create the bottom base of the windmill by gluing 10 wooden craft sticks, side-by-side to each other with wood glue.Repeat with another 10 wooden craft sticks, glued side-by-side. Step 2Create the tower of the windmill by gluing the bottom of the paper towel roll to the center of the base using wood glue.
Step 3Push the nail through the top of the paper towel tube leaving an inch of space between the top of the tube and the nail.


Step 5Glue six wooden craft sticks to the back of the wooden circle spaced evenly apart creating the fan blades.
Step 6Test the windmill's spinning capability by pointing the fan toward your windmill and turning it on.
Step 4Test the windmill by turning on the fan which should spin the windmill blades and light the light bulb. Em um motor CC comum, ha imas permanentes na parte de fora e uma armadura giratoria na parte de dentro. Quando uma corrente eletrica passa por esse eletroima, e criado um campo magnetico na armadura, que atrai e repele os imas do estator. Em um motor CC sem escovas (BLDC), voce coloca os imas permanentes no rotor e transfere os eletroimas para o estator. You can design and construct a windmill using many household items,based on the American wind machine design from the late 19th century, to create electricity. Glue the two bases on top of each other, in opposite directions, to make a two-layered bottom. Ensure the paper towel roll is tightly glued down by adding several coats of glue around the edges of the bottom of the paper towel roll.


Wrap the entire roll of magnet wire around the top of the paper towel tube, surrounding the nail hole without covering it up.
Entao, a armadura gira 180? e, para que possa continuar girando, e necessario inverter os polos do eletroima. Dessa forma, e possivel utilizar um computador (conectado a transistores de potencia) para energizar os eletroimas enquanto o eixo gira. Sao as escovas que cuidam dessa mudanca de polaridade, fazendo contato com dois eletrodos giratorios conectados a armadura, invertendo a polaridade magnetica do eletroima quando ele gira. Esse sistema traz varias vantagens:Imagem de dominio publicoOs polos do estator de um motor BLDC de duas fases usado para alimentar uma ventoinha de computador.
If the experiment is indoors, or on a calm day, you will need a small electric fan to create the wind.



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