| 摘要 |
PURPOSE:To reduce the entire width of a coupler itself by bringing the poles of a drive member at the base side coincident to the extension of the side surface of the drive member, thereby reducing the width of the member. CONSTITUTION:Poles 3b are projected from the outer projecting periphery of a drive member 4 which is secured to a drive shaft, the outer surface 3c of the base of the member is brought coincident to the extension of the outer surface 3d of the member, and the plan shape of the top surface is formed in an approximately trapezoidal shape constituted of a rectangular with a side length corresponding to the thickness between the inner and the outer surfaces and a base width corresponding to the length of the side surface 3f, and a trapezoidal shape in which the base length is equal to the length of the inner surface 3c. In this manner, the drive member can be reduced in width, the entire width of the coupler itself can be reduced, the flow of the magnetic flux can be made to a high efficiency, and the consumed magnetomotive force can be reduced at the poles. |
