The purpose of a motor is to generate motion from energy sources. These sources can be of different origins and one of the cleanest is undoubtedly that which is derived from magnetism. Pierre Curie postulated a principle that consists of the loss of the magnetic capacity of certain materials when they are heated (Curie Effect). Using this property of metals, we can create a motor using a magnetic field and a heat source, intense enough to remove the magnetic property of a metal and make it move away from the magnetic field, even if it is a metal such as iron or nickel.
- One long screw.
- One nut.
- A metal washer to tighten the screw.
- A piece of wood 0.75 inches wide x 4 inches long.
- A thin piece of metal 3 inches high x 1.25 inches wide.
- A birthday candle.
- A wooden base 1.5 inches high x 3 inches wide and 0.5 inches deep.
- A nail.
- A short screw.
- A round magnet 1 inch in diameter.
- A 1.5 inch piece of aluminium wire with a ring connector.
- A good piece of nickel alloy wire.
- A drill.
- A hammer.
Thermo-magnetic motor assembly
The first thing we are going to do, is to assemble the frame of our little one engine. To do this, we place the wooden base on a flat surface and place the metal plate on the left side, we mark with a pencil where we are going to fix the plate to the base and with the help of a drill, we make holes in the plate and in the wooden base. Then, with a screw we fix the metal plate to the wooden base.
With the metal plate ready, we drill a hole in the upper part of the long piece of wood with a drill and with the help of a hammer and a nail, we fix the lower part of the long piece of wood to the base and we have the frame ready.
Next, we take the aluminium wire with the ring-shaped support and insert it into the long log to make a kind of pendulum. With the help of washers and a nut, we fix it to the upper part of the long piece of wood, leaving it protruding from the bar, so that the wire can turn freely.
Then, we wind the nickel alloy wire in a spiral shape on the lower part of the aluminium wire. In this way, we form a metal mass that will be attracted by the magnet. Now, we place the magnet on the metal plate, near the top edge and we will see how it attracts the metal pendulum that we have just created.
All that remains is to place a birthday candle under the metal pendulum attracted by the magnet, which we will light and see what happens.
The Curie Effect consists in the loss of magnetic capacity of the materials when heated. The candle heats the nickel wire until it loses its magnetic capacity and withdraws from the magnet, but when it cools slightly, it recovers its capacity and is attracted again by the magnet, generating an oscillatory movement in the form of a pendulum, which can be used for multiple purposes.