| 摘要 |
PURPOSE:To improve the torque without increasing the number of magnetic poles by radially forming alternate N and S poles and providing every pole face with at least one weak portion in its center in the circumferential direction. CONSTITUTION:N poles N1-N5 and S poles S1-S5 are alternately arranged in the radial direction. The face of the magnetic pole N1 is divided into three subpoles N11, N12 and N13 in the circumferential direction; the magnetic force of the subpole N12 is made weaker than that of the subpoles N11 and N13. For the other pole faces including the face of the magnetic pole S1, the same is done. This increases the torque without increasing the number of magnetic poles. |
