ORIGINALDUSTCOVER - HOMEMADE EXPERIMENTS

PHYSICS EXPERIMENTS
EXPERIMENTS OF MATHEMATICAL
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EXPERIMENTS OF SOLAR ENERGY
PLANES OF EXPERIMENTS
ROBOTS AND ROBOTICS
VIDEOS OF EXPERIMENTS
ROBOTICS



WIND GENERATORS (TO WIND)

He is really very interesting to work with the power of the wind and he is not difficult nor very expensive. But it is not necessary to wait for much of a project that costs little and is psoible that not of much electricity. Another important aspect is that in the fairs of sciences our knowledge of the Scientific Method is due demostrarr.

First, one of sees become familiar with the wind turbines and as they work.

The most important things that they will have to take into account are:

  • Can the turbine work with real wind in the outskirts of the school or it will be due to make work with the air of a dryer of hair.?
  • It is only needed to demonstrate that the turbine provides electricity or is necessary to make work a center, LED or rotate a motor?

If the project goes away to use the ventilator of a dryer of hair then could be small and it is not very difficult to do. But it is required that our trubina works with the real wind then will have to be greater, to count on a support to place it raises it and she will be muhco more complex.

 DC motors

Much people decide to go by this route, DC motors already work as generators when it is rotated in direct form, and is very easy to do it – the motor one places on a support and it is rotated the axis. When placing a detector of voltage to the terminals of the motor will notice that there is a current. The problem is that this current is very weak and cannot make work centers or other motors, some   not even they manage to ignite a LED. The problem is that the majority of the motors of CC must turn at much speed (RPM) the majority to 5 000 to 10 000 RPM. In order to obtain voltage of these motors, these must turn at least in a 20% faster than the RPM especidficadas by their manufacturers. kla greater part of the turbines turns to a maximum of 500 RPM, which causes that 1000 RPM are almost impossible for the small turbines that we wished to construct.

Nevertheless motors exist that work to few RPM. The motors of the ventilators of the computers can serve, but some do not have “brushes? and they will not work for these applications.  The best thing is to verify if a motor provides or noncertain voltage and current. For this Multímetro or Tester is needed. In order to prove a motor it is taken this and note if it has more than two cables, if it is thus is of the mistaken type and one is not due to use. The multimeter to 2 cables of the motor is connected and is placed to detect it CC in the rank of the 2 to the 12 volts. It is rotated the axis by hand or with an electrical drill or manual at a minimum speed as it is seen down. The voltage is observed that is obtained.

 

The voltage that is obtained rotating the drill at very low speed is probably more than it will be possible to be obtained from a certain project. We see that voltage is due to obtain in the motors to make work the loads most of:

Red LED: 1.7v - LED white: 3.6v - Center of lantern: 3v to 6v. water pump miniature: 3v to 6v- to load battery: 1 volt, soon another 1 volt for the diode.

If these levels of voltage of our motors cannot be obtained, it is possible that it must go to another motor, for this we must again use our to tester. The time to verify the voltage also we must see the amperage or the current that is obtained from the motors. Most of the dipositivos that we saw in the listing do not require much current. 

Another option is to place to the motor gears to him to cause that the axis turns more quickly. With this they will be possible to be obtained volatejes in the rank of 1.5v-3v sufficient as for almost all the applications.

Account is necessary to occur of which if it is desired to load a battery is due to place a diode to avoid that the battery rotates to the motor and the diode will make to go down the voltage near 1 volt.

 

MEASURING THE CURRENT

Once constructed a generator we are due to find out whatever of current and of voltage we have when coming out of the generator, for this of we must count on a good multimeter as which it is seen in the photo of above.

HANDMADE ALTERNATORS

Although the small motors of CC work very well is necessary to rotate them to very high RPM reason why it is good idea to use a homemade generator as which it is seen in the part of above.

CASETERAS MOTORS

Some motors are the suficentemente great thing as giving a good voltage, can be used the motors of the caseteras.

THE SHOVELS

In order to make an efficient generator it is good for occurring a time in making the shovels of an suitable way, since on them whatever will depend takes advantage the wind force, if the shovels are not good, the aprovecahmiento will not be optimal.

The shovels can be done of wood, plastic and until of plastic tubes PVC.

 

Two shovels are used generally, but it is good idea to use three or more shovels thus to take advantage of the most possible wind force.

 

 

GENERATOR WITH SHOVELS OF RULES

This it is a simple generator with three shovels of wood rules. The generator is an alternator of an old VCR.

The motor of the photo is necessary to know how to choose the suitable motor that says BAD is not due to use because very strong currents of Eddy are generated in the metal plate and when increasing the RPM the motor is begun to restrain.

THE LED

We give a glance to the LED that we must use. The use of Leds is recommended red because they require the smaller voltage to work. The Leds require DC (CC) to work, but the generators often give AC voltage (CA) reason why the Leds in inverse form are connected. The resistor is to limit the current and to avoid that the Leds are burned.

If it is used a small center is possible that encieda very little or almost nothing, reason why does not recommend its use.

 

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GENERATOR WITH PERMANENT MAGNETS

completed alternator

Generator with permamentes magnets done with homemade materials


This it is a homemade generator done with permamentes magnets

and coils of enameled wire.

As it can turns in the photo down are placed permanent magnets in a wood disc.

  finding where to drill

The coils are placed in the form of sandwich between two acrylic plastic plates which in center have a hole through which it passes the axis (a screw) that maintains all the set. The part that turns is the wood disc, whereas the coils remain stationary. The coils are due to connect in series.  

In theory to place so many coils they allow to a voltage two or three times greater than a single a coil.

 

In the photo down the generator with leds can be seen placed and ready to be used. tanbién can be seen a current rectifier that turns the AC voltage into DC.

The rectifier changes the multiple phases reason why the Leds do not have to connect themselves as it were taught in the circuit of above.

 

 

 

 

 

 

Down the generator in operation and the Leds can be seen very hard shining. As it is possible to be noticed they are used Leds red.

 




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