| 摘要 |
<p>Two or more regions having different magnetic circuit designs because of a change in a rotational axis direction in the shape of a cross section of a rotator (30) having a permanent magnet (1) and a rotator iron core (2), which is perpendicular to a rotational axis (10), are provided in an axis direction of the rotator (30), an auxiliary groove (5) is provided in a part of a region of teeth (7) of a stator iron core (3) in an axis direction, and the region in which the auxiliary groove (5) is provided is the part of the region for each region opposed to the region of the rotator (30) which has the same magnetic circuit design. With this structure, it is possible to reduce a cogging torque caused by a variation on the rotator side.</p> |
