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Magnetic poles of an electric motor

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bigjoe

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hello there, regarding the magnetic poles (North, south) of an electric motor. When electricity is applied magnetism comes out from the pole face, towards the rotor to make it rotate.

I am just wondering, what about the other side of the pole (face), which is facing the casing or the body of the motor, is there magnetism coming out from there? if there is, why it seems like there is no magnetism coming out from the body of the motor?

thanks.
 

Re: electric motor poles

The body of the motor is designed so that it enables good and short as possible way for magnetic fields.
Magn. field must be strong as possible inside rotor , this way maximum torque can be achieved.
Analogy: Magn. field is like current in closed circuit, less resistive elements means higher current.
If magn. field must go outside motor it means weakened field and less torque.

Dc_Motor_Magnets.jpgDc_Motor_4-pole.jpgDc_Motor_arma&field.jpg


KAK
 

Re: electric motor poles

kak111.. thanks.

As i try to analyze it, since the poles (other side facing the body/case) are connected/shorted on a circular path, this way provides a path on the magnetic field, thats why the magnetic field is concentrated towards the rotor
 

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