Stator core and motor

A stator core comprising:

• an annular core back;
• and
• a plurality of teeth extending radially from the core back to a rotor magnet including a plurality of magnets;
• wherein
• a ratio of a number of slots, which is equal to a number of the plurality of teeth, to a number of poles, which is equal to a number of the plurality of magnets of the rotor magnet, is 3:4;
• a slot open ratio, which is a ratio of a slot open angle between two adjacent teeth in a peripheral direction to an angle between center lines of the two teeth, is 0.5 or more;
• and
• when, in the rotor magnet, a ratio of a peripheral angle of one magnet to an angle between center positions of two adjacent magnets in the peripheral direction is a magnet ratio, a ratio of the slot open ratio to the magnet ratio is 0.6 to 0.7.