Electric motor

An electric motor comprising:

• a yoke having six magnetic poles;
• a rotary shaft which is provided inside the yoke in a freely rotatable manner;
• an armature core which has teeth attached to the rotary shaft, radially extending in a radial direction and set in an arrangement of an even number, and an even number of slots formed between the teeth;
• a coil which is wound around the teeth in a single wave winding;
• a commutator which is provided in the rotary shaft to be adjacent to the armature core and has a plurality of circumferentially disposed segments to which the coil is connected;
• and
• three brushes including a low-speed brush, a high-speed brush and a common brush, the low-speed brush and the high-speed brush coming into slide contact with the segments to supply the electric power to the coil, and the common brush being commonly used with the low-speed brush and the high-speed brush.