| 摘要 |
PURPOSE:To reduce the armature reaction magnetic flux passing through the rectification region and improve the characteristics of rectification for the subject motor by a method wherein thin iron plates, providing with a long hole in the axial direction, are fixed by adhesion on the inner circumferential surface of the ferrite permanent pole of a field magnetic pole. CONSTITUTION:On the inner circumferential surface of the ferrite permanent magnets 40-44, iron plates 51-54, with a plurality of penetrated long hole 51a in axial direction, are fixed by adhesion in such a manner that they are covering the entire surface of the permanent magnets. The section in circumferential direction of the iron plates 51-54 is in a discontinuous state of condition through the intermediary of the long hole 51a, and as the long hole 51a is making a space, there exists air which is a parametric substance. Accordingly, the shunt magnetic flux phi5 of the armature reaction magnetic flux phi passing the magnetic circuit 6e of the iron plate 51 is attenuated by the air existed in the long hole 51a section. As a result, the magnetic flux passing through rectification regions is attenuated, and evils giving ill effect upon the rectification characteristics of the armature winding can be reduced. |
