| 摘要 |
PURPOSE: To generate a plural number of pairs of magnetic poles at an annular or flat object by providing a magnetic field attenuating means so as to avoid degaussing a magnetized part, first generating about one or two pairs of magnetic poles and next, moving a magnetizing device relative with respect to an object so as to generate an additional magnetic pole pair. CONSTITUTION: When pressing a supporting member 10 to an object to be magnetized 34 and making a current flow through magnetic conductor 26 and second conductors 28 and 30 from a pulse generator, a south pole and a north pole are respectively generated at the upper side part and the lower side part of a band 36 of the object 34, and a north pole and a south pole are respectively generated at the upper side part and the lower side part of a band 38. As the position of the member 10 next and supplying a current is moved in a direction opposite to that in the former case, a south pole and a north pole are generated respectively at the upper side and the lower side of a band 40 to reinforce the magnetizing of the band 38. At this time, the flow of a magnetic flux generated by currents passing through the conductors 38 and 30 attenuates the flow of a magnetic flux generated by a current of the conductor 26, passing through projections 12 and 18 of the member 10 and groove holes 20 and 24 for protecting a magnetic pole already formed in the band 36, positioned under a projection. Thereby, plural number of pairs of magnetic poles are formed at the annular or flat object. |
