Motor

A motor, comprising:

• a stationary portion;
• a rotary unit;
• and
• a bearing portion rotatably supporting the rotary unit based on a center axis,
• wherein the rotary unit includes:
• a shaft extending along the center axis,
• an armature core attached to the shaft and having six teeth radially extending toward a radial direction,
• a coil group of 6·n (however, n is 1 or 2) concentrated winding coils installed at the six teeth, using a coil formed by concentratedly winding a lead wire around one teeth as a concentrated winding coil, and
• a commutator electrically connected to the coil group, and
• the stationary unit includes:
• a pair of field magnets having same polarity facing each other, having the armature core disposed therebetween, and
• a housing having a cylindrical yoke accommodating the pair of field magnets, wherein in the yoke, a pair of portions facing each other between the pair of field magnets in a circumferential direction is a pair of magnetic poles directly facing the teeth of the armature core while having an opposite polarity to that of the magnetic poles, and
• a brush group contacting the commutator.