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If you are looking to give your special someone a gift on Valentines Day that is unique and can't be bought in stores, look no further! This project is based on the Homopolar Motor, it can be built in a few minutes and will cost you less than a dollar in parts but the results are quite impressive. Chances are you already have everything needed in a few drawers in your house.

Items you will need:
  • AA Battery
  • 10 Gauge wire (thinner wire will also work fine)
  • Magnet
  • Pliers to cut and form the wire


Steps in building the Homopolar Motor:
  • Cut the wire to length, you can leave it slightly longer than needed and trim it later
  • Snap the negative side of the AA battery onto the magnet
  • Bend the wire in the desired shape, a heart shape is recommended for the best effect :)
  • Place the wire on the positive pole of the AA battery and watch it spin
So what is going on here? What makes the wire spin around and around? It is caused by an interesting thing called the Lorentz force, the current flowing in the wire is creating a magnetic field that interacts with the permanent magnet causing rotation.

 

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]]>batteryelectronicHomopolarMotorvalentineValentines DayValentinesDayAlan Parekh2008-02-05T10:00:00 00:00Magnetic Levitationhttp://www.diylife.com/2008/01/25/magnetic-levitation/http://www.diylife.com/2008/01/25/magnetic-levitation/http://www.diylife.com/2008/01/25/magnetic-levitation/#commentsFiled under: ,


We use magnets in our everyday life, they hold notes onto the fridge, pick up metal parts that dropped in awkward places, they are even used in some high security keys. We have also seen two different types of magnets, permanent magnets such as your fridge magnet which is always magnetized. And electromagnets used in applications like junk yard car cranes which can be turned on and off as needed.

One interesting application of the electromagnet is creating a magnetic levitation device. This is where a magnet is used to lift an object towards it but does not let the object touch the magnet. There are a few ways to do this but here are the operational steps for one of the simpler methods.
  1. Power is applied to the electromagnet, a metal object will now be attracted to the magnet and want to move towards it.
  2. A sensor is then used to detect when the object that is now moving towards the magnet is too close.
  3. The step 2 sensor now causes the magnet to turn off.
  4. Since the magnet is now off the item falls away from the magnet.
  5. The sensor now detects that the object has fallen away slightly and applies power to the electromagnet again (step 1)
The sensor is generally an IR sensor which consists of an infrared LED and an infrared transistor. The LED sends out IR light and the transistor looks for the presence of the light. These sensors would be setup so that they look at each other creating a beam, this beam would be located directly below the electromagnet. Any object that gets too close to the electromagnet would then block the beam of infrared light.

Magnetic Levitation devices are available for purchase, but there is no fun just buying something when you could make it yourself! The video above demonstrated a device built by JHLI. He doesn't go into the details of building one but have a look at this site that describes all the steps needed to build your very own.

 

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]]>electromagnetelectronicinfraredLEDLevitationmagnetAlan Parekh2008-01-25T15:00:00 00:00