| 摘要 |
PURPOSE:To reduce the size and to enhance the efficiency of a DC motor by separating the end of the side having an auxiliary pole of a field from the position of a brush, and approaching the portion having a permanent magnet to the position of the brush, thereby increasing a torque. CONSTITUTION:The end 8a of a permanent magnet 8 approaches a pair of brushes 10 on a rectilinear line c-c' and the end 9a of an auxiliary pole 9 separates from the brushes. As a result, a line b-b' for connecting the central positions of fields is inclined at the prescribed angle theta in the rotating direction R of an armature with respect to a line a-a' perpendicular to the line b-b' for connecting the central positions of the poles, thereby increasing the main field magnetic flux amount. |
