Patent ID: 11894721
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  A | IPC H

Claim 0:
1. 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.