Stator, electric motor, vacuum cleaner, and hand drying device

A stator disposed outside a rotor of an electric motor, the stator comprising:

• four split cores arranged in a circumferential direction about a rotation axis of the rotor,
• the split cores each including a stator core,
• the stator core including
• a tooth, and
• a yoke including a pair of joint parts each having a length from the tooth toward an outer side in a radial direction of the stator,
• wherein each joint part includes two side surfaces that are parallel to each other on opposite sides of each joint part,
• wherein in a plane perpendicular to the rotation axis of the rotor, a shape of an end of the tooth on an inner side of the end in the radial direction is asymmetrical,
• the shape of the end of the tooth differs between left and right sides of the end with respect to a straight line passing through, in the radial direction, a center of the stator core in the plane, the left side of the end being an upstream side of the end which is in a rotation direction of the rotor, the right side of the end being a downstream side of the end which is opposite to the rotation direction,
• an angle θ1 (degrees) formed by a side surface of the tooth and a side surface of the yoke on an inner side of the yoke in the radial direction of the stator satisfies:
• 90 degrees<01<180 degrees, and
• a first air gap between the tooth on the upstream side of the end and the rotor is larger than a second air gap between the tooth on the downstream side of the end and the rotor.