| 摘要 |
<p>A small DC motor (1) includes a motor frame (3) having a cylindrical portion (4), the cylindrical portion (4) having a constant thickness and having a cross section in a shape that comprises four sides and connecting portions, each of the connecting portions connecting adjacent two of the four sides and being located inward from a corresponding corner in a quadrangle comprising the four sides; and a magnet (2) having a circumferential surface on an inside thereof and having conformable contact with the motor frame on an outside thereof.</p> |
