Many electric motors can be used to demonstrate this idea. A conductor with a current flowing through it when placed in a magnetic field which is perpendicular to the current feels a force in the direction perpendicular to both the magnetic field and the current. From the motor that spins a DVD disc to the wheels of a hybrid car, permanent magnets are used in motors everywhere. It can be challenging to come up with a stable configuration of the wire that allows it to spin well without falling off. This is a good way to demonstrate the motor in front of a large group, where you need motion that's more obvious from a distance. Use a piece of solid (not stranded) wire. Homopolar motors are useful for demonstrating electromagnetic forces and explaining the concepts behind how motors work. )Shape your copper wire so that it can hook easily on the inside of the magnets.

A homopolar motor is a direct current electric motor with two magnetic poles, the conductors of which always cut unidirectional lines of magnetic flux by rotating a conductor around a fixed axis so that the conductor is at right angles to a static magnetic field. The science behind electric motors boils down to this: If you have an electric current flowing through a wire that happens to be in a magnetic field, it feels a force push on it. by Twin Musicom is licensed under a Creative Commons Attribution license ( It should be noted that whether a single rotation is effected by means of the motor 82 and the shaft 90, to provide the homopolar capacitor generator effect, or whether two counter rotating shafts 90 and 86, rotated by the respective motors 82 and 80, are used, the operation is the same. This force provides a torque around the axis of rotation. The magnet-battery combination sticks to the bolt because a bit of the magnetic field goes up through the battery. A generator is the opposite: Motion from some outside power source gets turned into current through a wire. If you use the left-hand rule to help figure out the direction of the force, follow these conventions: We are now required to collect sales tax in several states. Be prepared to fiddle with the wire a bit to get it right. Make a homopolar motor Turn yourself into an electromagnetism maestro with one of the simplest motors known to man—the homopolar motor. Use the already attached magnet to test the poles of the second magnet. Unfortunately, homopolar motors made with a piece of wire can’t be turned into a good generator. All orders placed & paid online by 1PM ET (M-F) will be shipped the same day! While there are many types of electric motors, K&J Magnetics takes a look at one of the simplest types: the Homopolar Motor. This demonstration clearly shows the wire moving, so it makes matters more obvious and jives well with the technical explanation.

This produced some obvious results, with the battery spinning out of control. This way, either both South poles or both North poles are facing outwards! We used 18 gauge wire, though other sizes would work as well. Homopolar Motorcar Posted on February 27, 2019 in Explore A homopolar motor is a device that relies on flowing electricity, magnetic fields, and the interaction between the two.

In this second setup, we hang the battery and magnet beneath a stationary steel bolt. The wire and the battery can become dangerously hot, so handle with care. To demonstrate the homopolar motor in action, we will show motors in 3 different configurations. Turn the crank by hand, and the motor supplies electricity.

As an actual useful motor, don’t expect much from it.

Put electricity in and the motor turns that into motion. From the motor that spins a DVD disc to the wheels of a hybrid car, permanent magnets are used in motors everywhere. We have seen other videos where the battery was hit with a chisel or other sharp object to make a small indentation for the screw-point to sit in. It consists of a voltage source, neodymium magnets, and a conductor that allows electricity to flow. It consists of a voltage source, neodymium magnets, and a conductor that allows electricity to flow. We removed all the insulation from the wire before experimenting with it. When it’s been properly shaped, hook the wire onto the motor!

You just don't get enough voltage out of it. In our You don’t have to use a magnet with a stepped groove in it, but we found it helpful to get the wire to stay in contact with the magnet this way. © 2020 AstroCamp School Programs. The magnetic field does not change the direction or strength.

Caution: With this much current flowing, things get hot quickly. This field is for validation purposes and should be left unchanged.A homopolar motor is a device that relies on flowing electricity, magnetic fields, and the interaction between the two.

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