DC /AC Motor

[M@35TR0]

How do DC and AC Motors work?

 

[hassam]

in dc motor we have coil of wire placed b/w opposite magnetic poles.a d.c current flows into the coil of wire when motor is switched on.as a general rule if we rotate something inside magnetic field a current is induced and vice versa i.e if provide current motion is produced.the direction can be found using fleming's left hand rule.hope that helped for futher details check this link.
http://www.s-cool.co.uk/gcse/physics/ma ... tor-effect
as for a.c motor i dont think that its in our course.

 

[shamil]

Dc motors have a split ring commutator which changes the direction of current in the coil every half turn and so twice every turn. it reverses the direction of current and so keeps the coil rotating in one direction. when the coil is horizontal it has max. leverage and when it comes to vertical it should stop but as it overshoots vertical the current direction is changed.

AC generator has slip ring commtators and when the coil rotates within the magnets due to the magneic field lines being cut, an emf is induced across the complete circuit

 

[M@35TR0]

Thanks.