Electromagnetism : Changing rotation of DC Motor.

Changing the DC motor isn't difficult. You change the positive wire to negative terminal. and negative wire to positive terminal. The DC motor will rotate in counter clockwise direction. Easy right. So how to change the rotation for DC motor like series,shunt and compound motors? Well you are here to find out. So lets go through it.

There's two ways to change the rotation of basic DC motor :

1) Reverse the armature winding

In order to revers the armature winding, the connection of A1 and A2 to the supply must be interchange or connect opposite terminal. A1 is connected to the negative terminal and A2 is connected to the negative terminal. 

2) Reverse the field winding

To reverse the filed winding, the connect of F1 negative terminal and connect F2 to positive terminal of the supply. 

By reversing the armature winding or field winding, the interaction between magnetic field between stator and rotor will change the direction of the torque in the armature conductor.
This will effect the force on motor by flux. You can see how to change the rotation of these motors by refer the table below.