how does an electric moter work.?

Question

a copper wire around something with a spinnig magnet in the middle creates electricity. got it. but does the amount of electricity you make depent on the amount of wire wrapped, the size of the wire wrapped, the size of the magnet, or how fast its spinning?? hmm, anyone?

Answer 1

Most types of electric motors can be used as generators. Your question sounds like you are asking about a motor being used as a generator but you don't say which type of motor you are asking about.

A DC motor (with brushes) can be used as a DC generator.
The unloaded voltage generated will be proportional to the speed of the motor. This is the idea behind one type of tachometer. http://www.servo-tek.com/Servo%20Motor%20Tach.html

If an electrical load is put on the motor (used as a generator) the output voltage will drop. The smaller the resistance the smaller the output voltage. The other effect of putting a load on the motor/generator is the torque on the shaft will increase.

Do you know what you are asking when you say the amount of electricity? I would assume you mean the amount of electric power.

P (watts)=(Torque (in-oz) x Speed (rpm))/1352
http://www.aveox.com/technical/generator.html

There is a trade off regarding the wire gauge and the number of turns since the number of turns that can fit in a given space depends on the diameter of the wire. More turns will result in a higher voltage for a given motor speed (at no load). Wire with a greater diameter will result in less resistance per turn and greater current carrying capability (less voltage drop as the load is increased).

A DC machine can have a permanent magnet field or a field made of turns of wire.

Answer 2

An electric current passing through a conductor produces a magnetic field at right angles to the current. That's the basic effect. Doesn't require a magnet, doesn't matter what the conductor is made of. You can learn the basic rules beyond this in a high school level physics class, it will require some mathematics. Details of types of motors and the way they work will take at least the equivalent of an introductory level class at a local community college. If you don't want to do this formally start with wiki articles or howstuffworks, for example "electric motor" and proceede from there.

Answer 3

The number of wraps and the size of the wire determine the power of the magnets that are sequentially turned on and off by electrical contact at the brushes to make a motor.

When the same device has energy put in by spinning the armature, electrical current is created by dragging pulses of electricity off the magnetic field created the wire wraps.

The motor converts electrical energy into rotary energy. The generator converts rotary energy into electrical energy.
The device is essentially the same.

Answer 4

The voltage an electric generator makes is proportional to the rotational velocity of the spinning magnet, the number of coils of wire, and the area bounded by the coils.

An electric motor is simply an electric generator operating in reverse.

Answer 5

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