Una Dinamo a partir de un Motor Eléctrico. Proyecto de Ciencias.

Una Dinamo a partir de un Motor Eléctrico. Proyecto de Ciencias.


Today I’ll show you how to use
small direct current electric motors as dynamos. Simply we invert its operation ie, instead of introducing current
power to produce movement we introduce movement and
they produce electric current. This is a direct electric current, unlike an alternator, which produces alternating electric current. In fact, the bicycle dynamos , known as bottle dynamos , in fact they are alternators, since they generate alternating current. These DC motors can be found in many devices, for some types of printers, toys many varieties, disk drives -this is a CD unit- This CD, for example, has three
engines: one for opening and closing the tray, another to rotate the disk and a third, who is here, which it serves to move along these guides the laser read-write header . There is the optic. Hairdryers also have a motor, in cheap models, those who have no possibility of cold air, It is a 12 volt motor. Not a 220 volt motor But I will explain that in another episode. Here, for example, I have three motors
a CD unit. Precisely the ones who turn the compact disc or DVD. I’ll teach you the basic operation. I have put this little propeller in order to see how it turns. We connect a battery,
since it is a DC motor. This is the negative side and this, the tip, the positive. If we connect it so … This motor turns clockwise and if we change the polarity, it rotates counterclockwise. Let’s connect it to this voltmeter to see what happens. To make the connections come in handy these alligator clips … I connect one here … and here the other alligator clip… We close the circuit connecting this one and now that is already connected I will
rotate the motor. The needle goes down, so I will change the sense of rotation of the motor shaft and the needle moves in the positive direction. We can try this other motor. You could even hear the noise made by the needle, because It is over 5 volts. Now with this tiny one, from a CD unit. Here we have it. We did not get as much voltage as with the others, but it moves. Now I will connect the motors acting as dynamos to different LEDs. Remember that the LED has polarity. The longest leg is the positive and negative the shorter If you connect in reverse it will not turn on. I connect to each of the motors
a LED. I have red, yellow, green … If I turn the motor… I will dim the lights to show it… See how in this rotation sense the LED lights briefly. However if I turn it in the opposite sense
it doen’t turn on. Let’s try this one … With this little one to see if it is possible. There we have it … See it … the green. This is connected the othe way around. I have to turn it counterclockwise. Now what I’m going to do it is with a thread, pass through the pulley on the shaft of the motor, so that it spins longer than turning it by hand. When the motor goes down the LED lights glow. Now I’ll roll it the other way around. And now the opposite has to happen,
when the motor go up the LEDs glow and instead it does not turn on when we came down. Do you know why this last light goes on in both senses of rotation of the motor shaft? With the help of this digital multimeter we will measure the voltage we can achieve with each of these motors. We put it in scale 20
volts to start … I’m over 9 volts. Of course if we turned the shaft faster the voltage would be higher. And finally I will connect two
motors together. One of them, whom I will turn, will act as a dynamo and this will receive the electricity and will act as a motor, so that when we turn this shaft
the axle of this other motor will turn. Let’s try to see if it works. If I turn it in this sense… the motor turns in that sense. If I change the sense of rotation … Observe how is changing the sense of rotation of the motor. And how it works? Well, inside the engine we have, on the one hand some magnets and on the other hand a electric conductor. That conductor is a copper wire wound in a coil. By moving the coil relative to the magnets an electric current is generated. Finally, before I forget,
send here a cordial greeting to Josué Alejandro Matos, from Lima, Peru’s capital and Miguel Llado, from Nuevo Laredo in Mexico. By the way, remember that Mexico, from the ones not from there… Mexico is not pronounced /Meksiko/ it is said /Mejico/ o / Mexico / or /Mexico/ more or less smooth as you pronounce the J, but never
/Meksiko/ as the Americans would say, since there in old Castilian it didn’t exist the symbol j for the sound /x/ it was done with, it represented better
said, with an x. That’s all. See you Monday
at Cienciabit.

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