A unipolar motor works on the same principle as a unipolar generator (Faraday disk), using the principle of reversibility of electromagnetic phenomena. Such a motor is characterized by the fact that it consumes a significant current at low voltage.
Instructions
Step 1
Wear special goggles designed to protect against mechanical hazards and heat resistant gloves. A unipolar motor spins up to a speed at which its moving parts can separate and cause eye injury, and the current-carrying parts that are part of it can heat up to significant temperatures.
Step 2
Remove the magnet from the damaged headphones. They use two types of magnets: black ring magnets and silver pill-like magnets. Only a second type of magnet will work. Never allow it to be swallowed by children and pets!
Step 3
Take a regular nail or self-tapping screw. Place the magnet over its head.
Step 4
Take an ordinary finger-type battery (preferably a salt one, since its internal resistance is greater, which is safer) in your left hand and place it vertically with the plus down. Never use a rechargeable battery or lithium battery. Magnet the tip of a nail or self-tapping screw to the positive contact of the battery so that the cap with the magnet hangs down. With your left thumb, press a piece of wire against the negative terminal of the battery.
Step 5
With your right hand, lightly press the opposite end of the wire from the side to the magnet, and it will begin to rotate. Keep the engine in this state for a few seconds, then turn it off, otherwise it will heat up. Do not touch moving parts and do not allow the engine to accelerate. In all cases, if you feel the slightest heat, immediately turn off the motor.
Step 6
Turn the magnet over and repeat the experiment. You will find that the motor spins in the opposite direction.
Step 7
Now try reversing the polarity of the battery. You will find that this will have the same effect - the direction of rotation will be reversed. If you turn over both the battery and the magnet at the same time, nothing will change - the principle "minus by minus gives a plus" will work.
