| 摘要 |
PURPOSE:To enable the positions of permanent magnets to be exactly detected and reduce speed ripple by permitting a magnetic body to be used for detecting the position of a field magnet, to come in close contact with the field magnet, and by magnetizing the magnetic body with the magnetic flux of said field magnet. CONSTITUTION:On a field core 1 with previously arranged permanent magnets 2, 2,..., a magnetic body 6 before magnetized is placed with a back plate 7 on its upper section. The magnetic flux density of the permanent magnets 2, 2,... is high with 4000-5000 gausses, and so the magnetic body 6 in contact with the permanent magnets 2, 2,... is easily magnetized. Accordingly, on the magnetic body 6, magnetic poles at the same pitch as that of the permanent magnets 2, 2,... are magnetized as they are. The magnetic body 6 after magnetized is set in parallel with the field core 1 so that the permanent magnets 2, 2,... and the magnetic poles correspond with each other, one to one. |
