Make an Electromagnetic Motor: Overcome Short-Circuiting

[v_pino]

In order to make a electromagnetic motor, we wrap a coil of wire around a core. But wouldn't the metal core conduct as well, so we end up short-circuiting the system?

 

[stewartcs]

In order to make a electromagnetic motor, we wrap a coil of wire around a core. But wouldn't the metal core conduct as well, so we end up short-circuiting the system?

They don't actually touch, the core is laminated (i.e. insultated from the inducing conductor). For example, if you look at a transformer drawing, you'll normally see the coils drawn with a slight separation or gap from the core.

Since motors work off of transformer action, you have the same effect in a motor.

http://en.wikipedia.org/wiki/Image:Flux_leakage.svg

Hope that helps.

CS

 

[Doc Al]

The wire is insulated.

 

[v_pino]

Thanks for the reply.

So what is the purpose of the metal core?

 

[NoTime]

Thanks for the reply.

So what is the purpose of the metal core?

The metal core forms a magnetic circuit directing the magnetic flux to where it is most useful. A core is not required but make things much more efficient.