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Created with Fabric.js 1.4.5 The electrical motors The electrical motors - There exist a lot of over examples- electrical motors are omnipresent- Do you have over example to find electical motors ? OK, but how it works ? OK, but how it works ? - It use the electromagnetic principle : When I turn magnets in a electrical coilit appear an electrical current Magnet Coil Brush and manifold Alimentation The different part of the motor are : - the brushs- the coils- the magnets When I apply an electrical current to the brush, it deal to coils.If a current move in coils, it generate an electromagnetic fieldSo, it appear a rotation movement on the axe Important point November 1834 : the first electrical motor by Thomas Davenport 1888 : invention of the first synchronous motor, by Nikolai Tesla :it's reserved for powerful applications, but it's a big motor and it requirean important part of maintenance Just afer, the asynchronous motor arrive :It less powerful than the synchronous motor, but, it is smaller than it.the maintenance is not so hard. The applcation of this motor are in industry, in train... Today, in train, motors are very reliable :- It use less electrical energy during it work- TGV and over train like that go faster and faster each year with the state of the art. The Brushless motor : It's an evolution of the electrical motor.Like it name, on this, we have no brush, and looses by commutation disappear.It is more powerful Do you remember of this experiment ? When we take magnet and we put its together, we can observe two reactions : - It attracts- It puts off Now, If we put a coil around a piece of steeland we apply electricity, the part of steelbecome electromagnet. We can adjust the sensitivityof the electromagnet with the electrical current. In fact We use motor in a lot of things, with yearsit ameliorate grealty and I think in few years, motors become very stong and reliable.
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