How a DC motor works?

(Image: DC Motor Principle)

The carbon rod shown in figure starts rotate  when  we turn on the current.  As per motor principle we need two fluxes inside the motor. Here one flux is produced by magnet called stator flux and one more is produced by when  dc current flows through conductor called rotor flux. The intersection these  two fluxes makes a  carbon rod to rotate.

We can find the direction of  rotation of motor  by using fleming’s left hand rule.