![]() Thus, when one electromagnet is North, the other is South and vice versa. Moreover, the windings of the two magnets are winded in reversed direction. Thus, each electromagnet will change its magnetic polarity. For now, you only need to know that during a full cycle of the rotor, the current that runs through each winding change direction once. The coils are powered from the commutator and the brushes. The basic DC motor has actually two windings and two permanent magnets. This is called "the right-hand screw rule". If you had the coil inside your hand and your fingers (except the thumb) was showing the direction of the current, then the thumb shows the direction of the magnetic lines as well as the orientation of the North pole. Close your fist and hold your thumb upwards, like thumbs-up. Using your right hand, you can find out the direction of the magnetic lines as well as the North pole orientation.
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