| 摘要 |
PURPOSE:To obtain a slot core type DC motor having small cogging by forming a recess moved backward with respect to an armature core near the boundary of the poles of a magnet. CONSTITUTION:A field magnet 6 magnetized at 8 poles for forming a rotor is engaged within a cylindrical rotor yoke 7. A recess 6a moved backward with respect to an armature core 1 is formed near the boundary A of the poles of the magnet 6, and salient poles 6b are formed at the centers of the respective poles. The peripheral length (l) of the poles 6b is set to become 60% or less of a pole pitch P. Thus, since a gap between the vicinity A of the boundary of the poles and the tees 3 of the core 1 increases, the magnetic flux of the side of the tees caused by the boundary of the poles of the magnet is decreased to reduce a cogging. |
