Principle of an Electric Motor - Science Fair Experiment
Aim:
The aim if this science fair experiment is to explain the principle of an electric motor with the help of an experiment.
Materials Required:
1. 4 to 6 magnetic discs
2. 2 Batteries of 1.5 volts each
3. 2 feet long flexible wire (insulated).
4. Tape for insulation.
5. A block of wood (dimension 2 inches*4 inches*6 inches)
6. An emery paper and a knife.
1. Make a small cylindrical pile from the magnetic discs.
2. Now place this cylindrical pile of magnets on the smooth wooden surface such that they can roll.
3. Now divide the big cylindrical pile of magnets into two different piles with a gap of inch. This is such that the north pole of one pile faces the south pole of the other.
4. Now use the insulation tape to carefully tape the magnetic piles on the wooden board.
5. Then tape the battery on the same wooden board such that the curved surface of the cylinder faces the battery.
6. Remove the insulation from both the ends of the insulated wire with the help of the knife or the emery paper.
7. Now loop the wire through the space in between the two cylinders such that the ends of the wire touch the terminals of the battery.
8. Then make the ends of the wire touch the battery terminals. The wire loop will jump up or down.
9. If we reverse the current's direction of flow the wire jumps exactly in the opposite direction.
Scientific Explanation:
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How do you build a magnetic motor?
Does anyone have any idea how to build a small magnetic motor? I get the basic idea but how do you put one together? I don’t need it to do anything other than spin in a circle.
Here is a very simple one:
http://www.instructables.com/id/Homopolar-Motor-With-Five-Speed-Manual-Stick-Shift/
what do i put in between a electric magnetic motor and the battery to charge it without the battery trying to?
im trying to charge a battery with a magnetic motor but i dont know whats in between them that stops the battery from trying to run the motor so that the motor will charge them?
If the shaft of a DC motor is spun it can act as a generator.
If the voltage is higher than the battery voltage and it is connected properly the battery will get charged. If the voltage is lower then Gengi M’s suggestion will work. However, the voltage generated has to account for the additional forward drop of the diode.
How to make a magnetic motor?
I was wondering how to make a magnetic motor, a simple one with a bar magnetic spinning in the middle like a helicopter blade or something similar. Would have 3 small cylinder magnetics spinning around a bar magnetic and it spinning work? Thanks!
The only way I’ve been taught to make a magnetic motor is to put a magnet on the anode end of a battery (something like an AA) and shape a copper wire so that it will balance on the cathode end of the battery while the wire’s end(s) touch the magnet at the bottom. It makes a constant flow of electrons that spins the wire. If that doesn’t suit your purposes, then I’m sorry and good luck.
On a Magnetic motor we need the polarity to reverse at 180 degrees to keep the motor in a constant?
Is it possible to reverse the polarity at 180 Degrees on a Magnetic motor so the magnetic fields continue as overlaping increasing fields like it did from top to 180 Degrees. Without reverse polarity at 180 Degrees we have a break point.
A motor’s torque is maximum when the rotor is about 90 degrees out of phase magnetically with the stator. Any more than that and the rotor again approaches equilibrium, albeit an unstable one. In most motors, it isn’t so much the alternation of the magnetic polarities that provides the driving force so much as the the poles’ rotation about the stator that drives the rotor. This rotation is inherent in a three-phase motor or a single-phase motor with a phase splitter. Otherwise, the motor requires a mechanical asymmetry between the stator and rotor, most often the result of the existing motion of the rotor or somewhat dodgy commutation with the armature. Such motors often have poor starting torque before the asymmetry is well-established or are less reliable than polyphase motors.